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2004 Vol. 21, No. 4

Invited Talk
A Survey of Study on Multi-quark States
ZHANG Zong-ye
2004, 21(4): 263-265. doi: 10.11804/NuclPhysRev.21.04.263
Abstract(1543) PDF (139KB)(589)
Abstract:
The significant of the multi-quark state study is discussed and the present status of the experimental and theoretical studies on penta-quark state is introduced.
Enhancement of Total Reaction Cross Sections for 27,28P with a 28Si Target and Examination of Possibly Relevant Mechanisms
LIU Zu-hua, RUAN Ming, ZHAO Yao-lin, ZHANG Huan-qiao, YANG Feng, MA Zhong-yu, LIN Cheng-jian, CHEN Bao-qiu, WU Yue-wei, ZHAN Wen-long, GUO Zhong-yan, XIAO Guo-qing, XU Hu-shan, SUN Zhi-yu, LI Jia-xing, CHEN Zhi-qiang
2004, 21(4): 266-270. doi: 10.11804/NuclPhysRev.21.04.266
Abstract(2051) PDF (208KB)(609)
Abstract:
The reaction cross sections of~(27,28)P and the corresponding isotones on Si target were measured at intermediate energies. The measured reaction cross sections of the N=12 and 13 isotones show an abrupt increase at Z=15. The experimental results for the isotones with Z≤14 and~(28)P can be described well by the modified Glauber theory of the optical limit approach. The enhancement of the reaction cross section for~(28)P could be explained by the modified Glauber theory with an enlarged core. Theoretical ana...
Progress of Studies on Nuclei far from Stability Line
JIN Gen-ming, FU Fen, HUANG Xi
2004, 21(4): 271-275. doi: 10.11804/NuclPhysRev.21.04.271
Abstract(1787) PDF (229KB)(719)
Abstract:
Recently the predicted new decay model, for instance two-proton decay and β~(-)delayed fission have been observed in the investigations of the nuclei far from stability line. The existence of the nuclei located beyond the drip-line has already been studied experimentally and theoretically. It has been started to search for the neutron cluster in experiment by using neutron-rich nuclei. The researches of the spectroscopy and decay properties of the nuclei far from stability line are more and deeper, and...
Current Progress of Nuclear Astrophysics Study and BRIF at CIAE
LIU Wei-ping, LI Zhi-hong, BAI Xi-xiang, WANG You-bao, LIAN Gang, ZENG Sheng, YAN Sheng-quan, WANG Bao-xiang, ZHAO Zhi-xiang, ZHANG Tian-jue, TANG Hong-qing, YANG Bing-fan, GUAN Xia-ling, CUI Bao-qun
2004, 21(4): 276-283. doi: 10.11804/NuclPhysRev.21.04.276
Abstract(1764) PDF (235KB)(548)
Abstract:
A secondary beam line (GIRAFFE) at the Beijing Tandem accelerator lab was constructed for yielding low energy secondary beams. The current progress on the study of nuclear astrophysics and nuclear structure is presented. Up to now, We have carried out measurement of~(7)Be(d, n)~( 8)B,~(11)C(d, n)~(12)N,~(8)Li(d, p)~(9)Li, and~(6)He(p, n)~(6)Li reactions. The proposed Beijing radioactive nuclear beam facility (BRIF ) and its current R&D progress are briefly introduced. This facility is based on ...
Studies on Positron Energy Conversion
WANG Shao-jie
2004, 21(4): 284-285. doi: 10.11804/NuclPhysRev.21.04.284
Abstract(1516) PDF (241KB)(106)
Abstract:
The concept of positron energy conversion, the advantages of positrons, the possible applications and main research area of positron energy conversion were reviewed in this paper.
Medium to High Energy Physics
Quark Mean Field Model for Finite Nuclei and Hypernuclei
SHEN Hong
2004, 21(4): 286-288. doi: 10.11804/NuclPhysRev.21.04.286
Abstract(2546) PDF (132KB)(603)
Abstract:
The quark mean field model, which describes the baryon by using the constituent quark model, is applied to study the properties of finite nuclei and hypernuclei. The meson mean fields couple directly with the quarks and change the properties of baryons in nuclear medium. The quark mean field model provides satisfactory results on the properties of spherical nuclei and hypernuclei. It also predicts an increasing size of the nucleon as well as a reduction of the effective mass in the nuclear environment.
Progress in Hypernuclear Physics
LI Lei, TAN Yu-hong, WANG Qiu-ling, LUO Yan-an, ZHONG Xian-hui, NING Ping-zhi
2004, 21(4): 289-293. doi: 10.11804/NuclPhysRev.21.04.289
Abstract(2549) PDF (201KB)(560)
Abstract:
Progress and recent status of experimental and theoretical investigations on hypernuclear physics are briefly reviewed, including conventional hypernuclear physics and unconventional hypernuclear physics. We introduce the recent progress of hypernuclear experiments in KEK, Japan and the studies of fine structure in γ-ray spectroscopy of Λ hypernuclei. The spin-flip transition between the ground-state spin doublet of light hypernuclei has been observed and the transition energy provides important..
Particle-antiparticle Degrees of Freedom and Related Quantum Number for Dirac Particles
WANG Shun-jin, ZHOU Shan-gui, Hans-Christian Pauli
2004, 21(4): 294-297. doi: 10.11804/NuclPhysRev.21.04.294
Abstract(2309) PDF (113KB)(599)
Abstract:
he particle-antiparticle degrees of freedom and the corresponding intrinsic space are introduced to study the dynamical symmetry of the Dirac particle. As a result, the particle-antiparticle quantum number appears naturally and the Dirac particle has five quantum numbers instead of four. An anti-symmetry of the Dirac Hamiltonian and a dual symmetry of its eigen functions are explored. The operator of the Dirac equation in central potentials is found to be the analog of the helicity operator of ...
Nonperturbative Renormalization of Relativistic Eigen Equation for Meson Mass Spectra
WANG Shun-jin, ZHOU Shan-gui, Hans-Christian Pauli
2004, 21(4): 298-299. doi: 10.11804/NuclPhysRev.21.04.298
Abstract(1960) PDF (87KB)(582)
Abstract:
Nonperturbative T-matrix renormalization of the relativistic eigen equation for meson mass spectra is described and the expressions for eigen mass spectra and eigen wave functions are given.
Heavy Quarkonium Mass Spectra in a Relativistic Quark Model
MEI Hua, CHEN Hong
2004, 21(4): 300-305. doi: 10.11804/NuclPhysRev.21.04.300
Abstract(2180) PDF (211KB)(550)
Abstract:
A relativistic quark model based on the quasipotential approach in quantum field theory is briefly introduced, and by using this model, heavy quarkonium mass spectra are calculated in detail. It is shown that such a model can give results which are in agreement with the observed experimental data on the mass spectra.
Mass Spectra of Mesons in U(4) Transitional Theory
ZHANG Yu, PAN Feng
2004, 21(4): 306-308. doi: 10.11804/NuclPhysRev.21.04.306
Abstract(1470) PDF (105KB)(520)
Abstract:
A mass formula of q mesons is formulated based on the transitional theory in the U(4) vibron model, in which accurate fitting to 57 experimentally well-established masses of mesons is carried out. The results show that the transitional theory seems to be much better than the O(4) limit consideration in the description of mass spectra of q mesons. A comparison of the results from the transitional theory to those from the O(4) limit calculation and QCD potential model is also shown.
Performance Simulation of Internal-target Detector in HIRFL-CSRm
LI Wen-fei, XU Hu-shan, SUN Zhi-yu, XIAO Guo-qing, ZHAN Wen-long, GUO Zhong-yan, DUAN Li-min, LI Jia-xing, XU Hua-gen, CHEN Ruo-fu, ZHANG Xue-ying, JIA Fei, QI Hui-rong, MA Yue, ZHANG Hong-bin
2004, 21(4): 309-311. doi: 10.11804/NuclPhysRev.21.04.309
Abstract(2096) PDF (125KB)(652)
Abstract:
Based on the GEANT4, the performance of the electromagnetic calorimeter (EMC) of the internal-target detector at HIRFL-CSRm is simulated. The simulation results show that 1.5%—3% of the energy resolution σ_E/E and 2° of the polar angular resolution σ_θ can be obtained. The invariant mass of the π~0 decay can be reconstructed well. The performance can meet the requirement of studying the proposed physics at HIRFL-CSRm.
Study of TPC s Performance Based on Monte-Carlo in Internal Experiment Facility at HIRFL-CSRm
JIA Fei, XU Hu-shan, LI Wen-fei, DUAN Li-min, SUN Zhi-yu, XU Hua-gen, CHEN Ruo-fu, MA Yue, ZHANG Xue-ying
2004, 21(4): 312-314. doi: 10.11804/NuclPhysRev.21.04.312
Abstract(1989) PDF (118KB)(554)
Abstract:
Based on Monte-Carlo method the time projection chamben s (TPC s) performance at HIRFL-CSRm has been simulated. We have already studied the effect of magnetic field, wire space, the size of readout pad and the distance between the pad plane and the wire plane on the performance of TPC. At the same time some important results are given for designing TPC.
Nuclear Structure
High Spin-states of ~(122)Cs and ~(134)Ce in A=130 Neutron-deficient Region
ZHU Sheng-jiang, YU Ying-nan, GAN Cui-yun, ZHU Ling-yan, M. Sakhaee, XIAO Shu-dong, LI Ming-liang, CHE Xing-lai, WEN Shu-xian, ZHU Li-hua, WU Xiao-guang, LI Guang-sheng
2004, 21(4): 315-319. doi: 10.11804/NuclPhysRev.21.04.315
Abstract(1888) PDF (199KB)(599)
Abstract:
Through heavy ion nuclear reaction and in-beam γ-ray spectroscopy technique, the high spin states of neutron-deficient~(122)Cs and~(134)Ce nuclei in A=130 region have been studied. The~(107)Ag(~(19)F, 1p3n) and~(122)Sn(~(16)O, 4n) reactions were used. The previous level schemes of~(122)Cs and~(134)Ce have been extended. Possible chiral doublet bands in~(122)Cs have been observed and a shape coexistence with different γ values in~(134)Ce are suggested.
Experimental Study of High-spin States in Odd-odd 172Re
ZHANG Yu-hu, WANG Hua-lei, ZHOU Xiao-hong, LIU Min-liang, M. Oshima, Y. Toh, M. Koizimi, A. Osa, A. Kimura, Y.Hatsukawa, T. Morikawa, M. Nakamura, M. Sugawara, H. Kusakari, T. Komatsubara, K. Furuno
2004, 21(4): 320-323. doi: 10.11804/NuclPhysRev.21.04.320
Abstract(1594) PDF (179KB)(655)
Abstract:
in-beam γ-spectroscopy; deformed odd-odd~(172)Re; rotational band; signature inversion
Generalization of α-decay Cluster-model to Nuclei near Deformed Shell Closures
REN Zhong-zhou, XU Chang
2004, 21(4): 324-325. doi: 10.11804/NuclPhysRev.21.04.324
Abstract(2430) PDF (77KB)(540)
Abstract:
The cluster model of α-decay is extended to deformed nuclei. The branching ratios of α-decays from the ground state of a parent nucleus to the ground state 0~(+) of its deformed daughter nucleus and to the first excited state 2~(+) are calculated in the framework of the cluster model. The results indicate that a measurement of α spectroscopy is a feasible method to extract the information of nuclear deformation.
Triaxial Deformation in very Neutrondeficient Re Nuclei
ZHOU Xiao-hong, ZHANG Yu-hu, SONG Li-tiao, ZHENG Yong, XU Yan-bing
2004, 21(4): 326-330. doi: 10.11804/NuclPhysRev.21.04.326
Abstract(2414) PDF (170KB)(536)
Abstract:
High-spin states in~(169)Re were studied and resulted in the identification of a strongly coupled band based on the 9/2~(-)\ Nilsson state. The 9/2~(-)\ band in~(169)Re shows the largest signature splitting at low spin among the known odd mass Re isotopes. For the 9/2~(-)\ bands in light odd-A Re isotopes, the signature splitting of the Routhians and its relation with the signature dependence of M1 transition matrix elements are investigated in connection with the deviation of nuclear shape from axial symme...
Band Structure in 125Cs
MA Ying-jun, T.Komatsubara, WANG Shou-yu, Cederwall B, Nyberg J, ZHANG Yu-hu, Furuno K, LI Rong-jun, Sletten G, Hagemann G, Jensen H, Gjorup N, LIU Yun-zuo
2004, 21(4): 331-333. doi: 10.11804/NuclPhysRev.21.04.331
Abstract(2239) PDF (113KB)(675)
Abstract:
High-spin states in odd-A nucleus~(125)Cs have been studied via the~(116)Cd(~(14)N, 5n) reaction at 65 MeV bombarding energy. γ-γ coincidences were recorded with the NORDBALL detector array at Niels Bohr Institute in Denmark. After careful data analysis, most of the previously-known bands have been confirmed and 5 new rotational sequences have been identified. Spin/parity and configuration assignments are tentatively proposed for all of the observed bands. In addition, the bandheads of the 9/2~(+)and (1/2~...
Effect of Residual p-n Interaction on Crossing Frequency Delay of 1/2 ~-[541]Band
ZHAO Guang-yi, LIU Yun-zuo
2004, 21(4): 334-335. doi: 10.11804/NuclPhysRev.21.04.334
Abstract(1868) PDF (84KB)(604)
Abstract:
We estimated the effect of residual p-n interaction on the crossing frequency delay of the 1/2~(-)\ band of four odd-Z nuclei through the empirical method. The result shows that about half of the shift in crossing frequency in the 1/2~-\ band is the effect of residual p-n interaction. The residual p-n interaction plays a very important role in the crossing frequency delay of the 1/2~(-)\ band.
Lifetime Measurement of High Spin States in 171Ta
ZHANG Zhen-long, ZHU Li-hua, WU Xiao-guang, WANG Zhi-min, HE Chuang-ye, WANG Yue, MENG Rui, MA Rui-gang, CUI Xing-zhu, LI Guang-sheng, WEN Shu-xian, ZHENG Yong, A.A.Pastrernak, ZHOU Hong-yu, LIU Yun-zuo, YANG Chun-xiang
2004, 21(4): 336-338. doi: 10.11804/NuclPhysRev.21.04.336
Abstract(1882) PDF (112KB)(613)
Abstract:
The high spin states of~(171)Ta have been populated via heavy ion fusion evaporation reaction~(157)Gd(~(19)F, 5n)~(171)Ta at the HI-13 tandem accelerator in China Institute of Atomic Energy. The lifetimes of the high spin states in~(171)Ta have been measured by using the Doppler Shift Attenuation Method (DSAM). Six levels of its h_(9/2) proton 1/2\ band have been analyzed and their lifetimes have been deduced from the experimental data.
Study of High Spin States in Odd-odd Nucleus 90Nb
CUI Xing-zhu, ZHU Li-hua, WU Xiao-guang, LI Guang-sheng, WEN Shu-xian, WANG Zhi-min, HE Chuang-ye, ZHANG Zhen-long, MENG Rui, MA Rui-gang, LUO Peng, ZHENG Yong, HUO Jun-de, M.M.Ndontchueng
2004, 21(4): 339-342. doi: 10.11804/NuclPhysRev.21.04.339
Abstract(2020) PDF (149KB)(609)
Abstract:
The high spin states of~(90)Nb have been populated via reaction~(76)Ge(~(19)F, 5n)~(90)Nb at beam energy of 80 MeV. The de-exciting γ-rays have been measured with in-beam γ-ray spectroscopy method. After γ-γ coincidence analysis, 19 new γ transitions were identified and assigned to~(90)Nb. The new level scheme of~(90)Nb was established. Based on the semi-empirical shell model calculations, the configurations of the levels have been suggested. In addition, the spins and parities of the new levels ...
Rotation-vibration Transitional Patterns in Interacting Boson Model
PAN Feng, J. P. Draayer
2004, 21(4): 343-345. doi: 10.11804/NuclPhysRev.21.04.343
Abstract(2683) PDF (108KB)(597)
Abstract:
Transitional patterns from the U(5) vibrational limit to the SU(3) rotational limit in the interacting Boson model are studied in detail. The transitional behavior of low-lying energy levels, isomer shifts, E2 transition rates, and some other related quantities across the entire region are investigated. The results show that nuclei in the critical region are most non-rigid.
Formation Mechanism of Superdeformed Triaxial Nuclei 154Er
YU Shao-ying, AN Guang-peng, TU Ya
2004, 21(4): 346-348. doi: 10.11804/NuclPhysRev.21.04.346
Abstract(1552) PDF (108KB)(601)
Abstract:
Based on TRS theory the total routhian surface for~(154)Er nuclei is calculated, the result indicates it exists TSD state.
Theoretical Study of Superdeformed Triaxial States in 164Lu
YU Shao-ying, WANG Xiao-ming
2004, 21(4): 349-350. doi: 10.11804/NuclPhysRev.21.04.349
Abstract(1658) PDF (119KB)(623)
Abstract:
Total routhian surface in~(164)Lu nuclei is calculated according to the three dimensional Total Routhian Surface (TRS) theory. The result of the calculation is in agreement with the experiment. At the same time, two TSD bands could be assigned to the configuration(π\(1/2), α=1/2)(ν\(5/2), α=1/2), (π\(1/2), α=1/2)(ν\(3/2), α=-1/2).
Intruder Level and Deformation in SD-pair Shell Model
LUO Yan-an, PAN Feng, NING Ping-zhi
2004, 21(4): 351-354. doi: 10.11804/NuclPhysRev.21.04.351
Abstract(1802) PDF (128KB)(620)
Abstract:
The influence of intruder level on nuclear deformation is studied within the framework of the nucleon-pair shell model truncated to an SD-pair subspace. The results suggest that the intruder level has a tendency to reduce the deformation and plays an important role in determining the onset of rotational behavior.
Particle Number Conserving Treatment of Pairing in Relativistic Mean Field Theory
GUO Jian-you, MENG Jie, ZHANG Shuang-quan
2004, 21(4): 355-357. doi: 10.11804/NuclPhysRev.21.04.355
Abstract(2193) PDF (105KB)(638)
Abstract:
Particle-number conserving method is adopted to treat the pairing correlations in the relativistic mean-field theory. The formalism and numerical techniques are presented. As an example, the ground state properties and low-lying excited states in~(24)Ne are studied.
Single-particle Resonant States in Spherical Nuclei
ZHANG Shi-sheng, MENG Jie, ZHOU Shan-gui, G.C.Hillhouse
2004, 21(4): 358-359. doi: 10.11804/NuclPhysRev.21.04.358
Abstract(2558) PDF (107KB)(633)
Abstract:
Using analytic continuation in the coupling constant (ACCC) method within the framework of the self-consistent relativistic mean field (RMF) theory, the energies, widths and wave functions for single-particle resonant states close to the continuum threshold are evaluated. Predictions are also compared with corresponding results obtained by the scattering phase shift method.
Description of Chiral Doublets in A≈100 and 130 Nuclei
PENG Jing~(
2004, 21(4): 360-362. doi: 10.11804/NuclPhysRev.21.04.360
Abstract(2214) PDF (112KB)(593)
Abstract:
The Chiral doublets for nuclei in A≈100 and 130 regions have been studied with the particle-rotor model. The experimental spectra of chiral partner bands for four N=75 isotones in A≈region have been well reproduced by the calculation with the configuration πh_(11/2)νh~(-1)_(11/2). The possible chiral doublets in A≈100 region have been predicted by the particle-rotor model (PRM) with the configuration πg_(9/2) νg~(-1)_(9/2) based on the analysis of the B(M1) and B(E2) transition probabilities.
Spherical and Deformed Shell Closures in Superheavy Nuclei
WU Zhe-ying~(), XU Fu-rong~(
2004, 21(4): 363-367. doi: 10.11804/NuclPhysRev.21.04.363
Abstract(2189) PDF (177KB)(618)
Abstract:
The structure of superheavy nuclei has been studied by using the macroscopic-microscopic model. The macroscopic energy was calculated with the continuous medium model in which the energy is expressed as a functional of nucleon densities. The deformations and structures of superheavy nuclei were investigated systematically. Calculations reproduce well the available data of experimental α decay energies and half-lifes. The investigation of single-particle levels shows that the shell structure is deformed a...
Shell Structure of Superheavy Nuclei
ZHANG Wei, MENG Jie, , ZHANG Shuang-quan, GENG Lis-heng
2004, 21(4): 368-369. doi: 10.11804/NuclPhysRev.21.04.368
Abstract(2605) PDF (100KB)(721)
Abstract:
The magic proton and neutron numbers are searched in the superheavy region with proton number Z=100 —140 and neutron number N=(Z+30) — (2Z+32) by the relativistic continuum Hartree-Bogoliubov (RCHB) theory with interactions NL1, NL3, NLSH, TM1, TW99, DD-ME1, PK1, and PK1R. Based on the two-nucleon separation energies S_(2p )and S_(2n) , the two-nucleon gaps δ_(2p) and δ_(2n), the shell correction energies E~p_(shell) and E~n_(shell), the pairing energies E~p_(pair) and E~n_(pair), and...
Nuclear Reaction
Effects of Target Deformation on Synthesis of Superheavy Nuclei
LIU Zu-Hua, BAO Jing-Dong
2004, 21(4): 370-373. doi: 10.11804/NuclPhysRev.21.04.370
Abstract(2367) PDF (128KB)(548)
Abstract:
Effects of target deformation on the synthesis of superheavy nucleus~(283)112 are investigated in the framework of extra-push model. Our results show that the cross sections of the 3n evaporation residue in the~(48)Ca+~(238)U reaction for the case of β_2=0.275 are several times larger than those of β_2=0. Meanwhile, the peak position of ER excitation function in the case of deformed target is shifted to the lower energy as compared to the one of spherical target.
Development of Quantum Molecular Dynamics Model and Its Application to Heavy-ion Reactions near Barrier
WANG Ning~(), LI Zhu-xia~(,
2004, 21(4): 374-378. doi: 10.11804/NuclPhysRev.21.04.374
Abstract(2511) PDF (196KB)(682)
Abstract:
We have developed a new microscopic dynamical model called improved quantum molecular dynamical model (ImQMD). This model can describe the fusion process at energies near the Coulomb barrier as well as the multifragmentation process at intermediate energies in heavy-ion collision (HIC) uniformly. By using this model, fusion cross sections (including some of neutron-rich nuclei reactions and that of newly measured~(132)Sn+~(64)Ni fusion reaction) of tens reactions can be reproduced remarkably well. In fusi...
Connection between the Largest Lyapunov Exponent, Density Fluctuation, and Multifragmentation in Excited Nuclear Systems
ZHANG Ying-xun, WU Xi-zhen, LI Zhu-xia
2004, 21(4): 379-381. doi: 10.11804/NuclPhysRev.21.04.379
Abstract(1669) PDF (99KB)(552)
Abstract:
Within a quantum molecular dynamics model we calculate the largest Lyapunov exponent (LLE), the density fluctuation, and the mass distribution of fragments for a series of nuclear systems at different initial temperatures. It is found that the LLE peaks at the temperature ("critical temperature") where the density fluctuation reaches a maximal value and the mass distribution fragments is fitted best by the Fisher s power law from which the critical exponents for mass and charge distribution are obtain...
Recent Experiments on Asymmetric Fission of Medium and Light Nuclei
FAN Tie-shuan
2004, 21(4): 382-384. doi: 10.11804/NuclPhysRev.21.04.382
Abstract(1709) PDF (109KB)(602)
Abstract:
The excitation functions were measured for complex fragments with atomic number Z=4—25 emitted from the compound nuclei~(70,76)Se and~(90,94,98)Mo produced in the reactions~(64,58)Ni+~(12)C and~(78,82,86)Kr+~(12)C. The extracted mass asymmetric fission barriers have been compared with those calculated from macroscopic nuclear models.
Mean Last Passage Time and Nuclear Fission Rate
JIA Ying, BAO Jing-dong
2004, 21(4): 385-386. doi: 10.11804/NuclPhysRev.21.04.385
Abstract(1759) PDF (103KB)(618)
Abstract:
The mean last passage time is introduced to instead of the mean first passage time for studying the decay of an induced-fissioning system. The stationary fission rate determined by the inverse of mean last passage time across the saddle point is agreement with the resulting rate of Langevin simulation and better than that of mean first passage time arriving at the scission point.
Angular Distribution of Products in Deep Inelastic Collision of 19F+27Al
DONG Yu-chuan, WANG Qi, LI Song-lin, DUAN Li-min, WU He-yu, XU Hua-gen, CHEN Ruo-fu, XU Hu-shan, HAN Jian-long, LI Zhi-chang, LU Xiu-qin, ZHAO Kui, ZHOU Ping, LIU Jian-cheng, Sergey Yu-kun
2004, 21(4): 387-388. doi: 10.11804/NuclPhysRev.21.04.387
Abstract(1637) PDF (89KB)(607)
Abstract:
Angular distributions of fragments produced in the deep inelastic collision of~(19)F+~(27)Al have been measured for incident energy of 114 MeV at θ_(lab)= 9~(o), 24~(o), 40~(o), 55~(o), 70~(o) and 85~(o). Angular distributions of dissipative products B, C, N, O, F, Ne, Na, Mg and Al are analyzed to provide an evolution process of the intermediate dinuclear system formed in the reaction.
Semi-empirical Method for (n, p) and (n, α) Reactions Excitation Function
FAN Sheng, YAN Yang, ZHANG Hong-zhou, ZHAO Zhi-xiang
2004, 21(4): 389-390. doi: 10.11804/NuclPhysRev.21.04.389
Abstract(1862) PDF (112KB)(609)
Abstract:
To simplify the calculation, some assumptions are considered at present work. The preequilibrium emission is the first step in the equilibrium process, which is characterized by exciton n=3 and "never come back" are considered at the preequilibrium emission process; the proton and alpha emissions are only competed with the neutron emission, the second particle emission is neglected. A semiempirical method of the cross section for (n, p ) and (n, α) reactions were obtained on the basis of evaporatio...
Analyses for Spallation Fragment of p+208Pb by Using MSDM
FAN Sheng, YAN Fang, ZHANG Hong-zhou, ZHAO Zhi-xiang
2004, 21(4): 391-393. doi: 10.11804/NuclPhysRev.21.04.391
Abstract(1617) PDF (126KB)(588)
Abstract:
The level density of Ignatyuk formula is introduced into the Many stages dynamics model ( (MSDM)) instead of Fermi-gas formula to improve the simulation of spallation fragments. The results of (MSDM) with Ignatyuk formula reproduced the experimental data well for the mass and charge distributions, the formation cross sections of isotopic product of proton-induced spallation on~(208)Pb. The calculations are in agreement with the experimental data and better than some simulations by MSDM with Fermi-gas ...
Semi-empirical Research on Spallation Production of Proton Induced Nuclear Reaction with Medium-high Energy
ZHANG Hong-zhou, FAN Sheng, SUN Xiu-quan
2004, 21(4): 394-397. doi: 10.11804/NuclPhysRev.21.04.394
Abstract(2482) PDF (162KB)(554)
Abstract:
We analyzed the former solution of semi-empirical methods, which is first funded by G. Rudstam. On this basis, we pointed out that all the former solutions are basically based on so-called cumulative reaction data not on independent data. On the analysis of newly data measured by GSI, we founded that mass distribution of spalltion production could be divided to two parts: one is independent on induced-energy, but on the mass number of target; one is dependent on energy. Also, we argued that such...
Determination of Cross Sections of Ba Isotopes in Interaction of 60 MeV/u 18O with 238U
YANG Wei-fan, XU Yan-bing, YUAN Shuang-gui, NIU Yan-ning, DING Hua-jie
2004, 21(4): 398-399. doi: 10.11804/NuclPhysRev.21.04.398
Abstract(2225) PDF (83KB)(590)
Abstract:
The radioactive Ba isotopes were produced by 60 MeV/u~(18)O ion bombardment of natural uranium. Ba was separated from U and the reaction product mixture by BaCl_(2) precipitation. The Ba fraction was measured by off-line γ-ray spectroscopy. The cross sections of the individual Ba isotope were calculation based on the intensities of the character γ-ray peaks of Ba isotopes and other relative information. It was found that the n-deficient Ba isotopes have higher cross sections using the thick uranium targets.
Differential Cross Section Measurement for (n, x) Reaction of Light Nuclei
ZHANG Guo-hui, CHEN Jin-xiang, TANG Guo-you, SHI Zhao-min, CHEN Ze-min, Yu.M.Gledenov, M. Sedysheva, G.Khuukhenkhuu
2004, 21(4): 400-403. doi: 10.11804/NuclPhysRev.21.04.400
Abstract(2306) PDF (159KB)(642)
Abstract:
Our research work on (n, x) reaction for more than one decade is reviewed. The characteristics, structure, and working principle of the gridded ionization chamber are discussed. Differential cross sections and cross sections of the~(6)Li(n, t)~(4)He and~(10)B(n, α)~(7)Li reactions were measured in the neutron energy range of 1—7 MeV by using the GIC method. Experiments were carried out at the 4.5 MV Van de Graaff accelerator of Peking University. Results of the measurement are discussed.
Measurement of 14N(16O,α)26Al Cross Section by AMS Method
HE Ming, YANG Yao-yun, JIANG Shan, Y.Nagashima, T. Takahashi, LIU Ke-xin, DONG Ke-jun, REN Xiao-tang, WU Shao-yong
2004, 21(4): 404-406. doi: 10.11804/NuclPhysRev.21.04.404
Abstract(1656) PDF (125KB)(668)
Abstract:
The~(26)Al is one of the important nuclide in the astrophysics. The reaction, namely~(14)N(~(16)O, α)~(26)Al, may be one of the origin of the source of~(26)Al in the cosmic. The procedures of the cross section measurement with accelerator mass spectrometry (AMS) method are discussed, In this paper, the irradiation experiment, chemical separation and~(26)Al measurement are described. The results of cross-section (around) sub-barrier energies are also represented.
Recommendation of Fission Barrier Parameters and Fission Barrier Parameter Library
SU Zong-di, WANG Shu-nuan, FENG Ren-fa, ZHOU Jian-ming, SHI Shu-mei, WANG Bin, ZHU Yao-yin, LI Zhi-wen, HUANG Zhong-fu, LIU Jian-feng, DAI Neng-xiong, WANG Yu-sheng, ZHANG Ben-ai
2004, 21(4): 407-411. doi: 10.11804/NuclPhysRev.21.04.407
Abstract(1888) PDF (188KB)(551)
Abstract:
The fission barrier parameters for actinide nuclei were obtained by analysis and calculations of fission cross-sections and complete neutron reaction cross sections. A lot of experimental fission barrier parameters from different authors were collected. A set of fission barrier parameters for 129 nuclei ranging from~(109)Cd~( ) to~(255)Fm were recommended after performing comparisons, evaluations and systematics extrapolations for these extracted fission barrier parameters in model calculations of fissi...
Research of Nuclear Data Sharing
YU Hong-wei, JIN Yong-li, GE Zhi-gang
2004, 21(4): 412-414. doi: 10.11804/NuclPhysRev.21.04.412
Abstract(2472) PDF (134KB)(624)
Abstract:
The importance of scientific data sharing has been attracted attention of our government. The research of nuclear data sharing in China Nuclear Data Center are introduced. The work includes research of nucler database and development of online service system.
Development on Hybrid Evaluated Nuclear Data Library HENDL1.0/MG/MC
XU De-zheng, GAO Chun-jing, ZHENG Shan-liang, LIU Hai-bo, ZHU Xiao-xiang, LI Jing-jing, WU Yi-can, FDS Team
2004, 21(4): 415-418. doi: 10.11804/NuclPhysRev.21.04.415
Abstract(2084) PDF (135KB)(656)
Abstract:
A Hybrid Evaluated Nuclear Data Library(HENDL) named as HENDL1.0 has been developed by Fusion Design Study (FDS) team of Institute of Plasma Physics, Academia Sinica (ASIPP) to take into account the requirements in design and research relevant to fusion, fission and fusion-fission sub-critical hybrid reactor. HENDL1.0 contains one basic evaluated sub-library naming HENDL1.0/E and two processed working sub-libraries naming HENDL1.0/MG and HENDL1.0/MC, respectively. Through carefully comparing...
Anomalous Nuclear Phenomena Induced by Deuterium Flux inside Pd
LI Xing-zhong, LIU Bin, WEI Qing-ming
2004, 21(4): 419-421. doi: 10.11804/NuclPhysRev.21.04.419
Abstract(1491) PDF (105KB)(586)
Abstract:
Tritium production and the nuclear transmutation induced by deuterium flux inside Pd are described in order to illustrate the condensed matter nuclear science.
Fifteen Years of Cold Fusion
JIANG Xing-liu, LIU Rui, WANG Huai-yi, LE Xiao-yun, HAN Li-jun, WEN Xiong-wei
2004, 21(4): 422-424. doi: 10.11804/NuclPhysRev.21.04.422
Abstract(2704) PDF (137KB)(675)
Abstract:
Many papers published in the 10th International Conference of Cold Fusion( MIT, Massachusetts .Aug. 2003) reveal the experimental results of excess heat with a few of products of nuclear reactions. Over the years it is become clear that there are new effects to be surfaced. Thomas J. Dolan listed several interesting theoretical ideas including the model of vortex dynamics proposed by Xingliu Jiang. This model says that excess heat and nuclear reactions in electrical discharge system and other transient...
ransient Vortex Dynamics and Anomalous Nuclear Phenomena in Nonequilibrium System
JANG Xing-liu, JIU Zhi-jian, WEN Xiong-wei, HAN Li-jun
2004, 21(4): 425-427. doi: 10.11804/NuclPhysRev.21.04.425
Abstract(2303) PDF (157KB)(637)
Abstract:
The tip effect, magnetism self-pinch phenomena, high energy concentration on the cathode surface, electrochemical double layer, and polarized nucleus fusion in the process of electrolysis have been studied and discussed. The high concentrated and straight charged particles with energy above 10 MeV in (electrochemistry) systems were recorded by CR-39 solid trace detector. The hypothesis of vortex dynamics is proposed for explaining the peculiarities of excess heat and anomalous nucleus phenomena...
Nuclear Transmutation Induced by Carbon Arcing under Water
WANG Zhi-gang, JIANG Xing-liu
2004, 21(4): 428-429. doi: 10.11804/NuclPhysRev.21.04.428
Abstract(1712) PDF (77KB)(687)
Abstract:
There exist various phenomena for electric discharge, such as radiation with wide bands, collective acceleration, electron degeneracy and "linear atom", etc. which occur in dense state of matter.The arcing was created in the gap between two purified carbon rods in deionised water. The original carbon contained a few millionth iron, and the detritus contained up to thousands millionth iron based on the analysis by an (atomic) emission spectroscope (AES). It is deduced that the plasma filaments...