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2000 Vol. 17, No. 4

Nuclear Physics
Consistency and Sum Rule in Relativistic Nuclear Many-body Theory
MA Zhong-yu,
2000, 17(4): 191-194. doi: 10.11804/NuclPhysRev.17.04.191
Abstract:
A consistent treatment is extremely important in relativistic approaches. We emphasized the consistent approach in relativistic random phase approximation built on relativistic mean filed ground states. The consistent treatment requires that the studies of the ground state and excited states of giant resonances are based on same effective Lagrangian, and on a same complete set of basis. It was found that the effect of the Dirac states could not be neglected, especially in the case of giant...
Progress on Relativistic Many-body Theory
SHEN Hong, LI-Lei, NING Ping-zhi
2000, 17(4): 195-200. doi: 10.11804/NuclPhysRev.17.04.195
Abstract:
Relativistic many body methods, which include the relativistic Brueckner Hartree Fock (RBHF) theory and the relativistic mean field (RMF) approach, were introduced, while their progress and application for nuclear matter and finite nuclei were presented. The open questions in this field and the trend in future were also discussed.
Decomposition Theory of Gauge Potential and Its Application
LI Xi-guo
2000, 17(4): 201-209. doi: 10.11804/NuclPhysRev.17.04.201
Abstract:
The recent study of decomposition of gauge fields by means of methods of the geometric algebra was reviewed in detail. The new results in the study of the Euler characteristic by using the decomposition of gauge fields were described. On the other hand, some recent application fields of the decomposition of gauge fields and topological current theory were introduced. The new developments of the investigation in the area have also shown that the decomposition of gauge fields will provide...
Near-barrier Fusion of 9,11Be+209Bi
LIU Zu-hua
2000, 17(4): 210-211. doi: 10.11804/NuclPhysRev.17.04.210
Abstract(1588) PDF (736KB)(462)
Abstract:
The purpose and importance of the study of 9,11Be+209Bi near barrier fusion were reviewed. The breakup effects of the halo nuclei on fusion were discussed and compared with the experimental results of 9,11Be+209Bi systems.
Prolate and Oblate Shapes Coexist in 78Kr
BAI Er-jun, WANG Zhi-kui, LI Xian-feng, MA Ying-jun, ZHAO Guang-yi, LU Jing-bin, YIN Li-chang, SUN Hui-bin, HUO Jun-de
2000, 17(4): 212-215. doi: 10.11804/NuclPhysRev.17.04.212
Abstract:
Doppler shift attenuation lifetime measurements were performed in the 58 Ni( 23 Na,3p) reaction at 70 MeV and 58 Ni( 28 Si, α4p) reaction at 130 MeV. By analyzing the Doppler broadened line shapes of the 1 004 keV(10 -→8 -) negative parity transition in coincidence with depopulating transitions, the lifetime of the 10 - state has been deduced as τ =(2.2±0.3) ps. A similar analysis of 873 keV(8 -→6 -)transition gave values of τ =(1.6±0.2)...
Bands and Band Termination in 127La
DONG Bao-guo, GUO Hong-chao, I. Ragnarsson
2000, 17(4): 216-218. doi: 10.11804/NuclPhysRev.17.04.216
Abstract(2129) PDF (968KB)(486)
Abstract:
HJ4/9]The configuration dependent shell correction approach with cranked Nilsson potential is employed for explaining the experimental high spin spectra in 127 La. The experimental high spin band with parity and signature (+, -1/2) consists of two parts with a crossing around I =20 . It is most like to have the configuration [02, 6], π (h 11/2 ) 2 ν (h 11/2 ) 6 and almost reaching the maximum angular momentum at I =47.5 . It is in normal deformation region with ...
New Research Opportunities on Nuclear Physics by Facility of Radioactive Beams
LI Jun-qing, ZHOU Yong
2000, 17(4): 219-223. doi: 10.11804/NuclPhysRev.17.04.219
Abstract:
By making use of the facility for radioactive beams which would be able to supply intense high resolution beams of short lived (radioactive) nuclei, the neutron proton ratio can be extended to extreme values, where some new phenomena such as neutron halo, proton halo, neutron skin, proton skin, growing evidence of the fragility or disappearance of shell structure far from stability, the importance of pairing correlation near drip line, and the possible existence of new superconducting phases of...
Space Charge Effects of CSR
LIU Yong, XIA Jia-wen, XU Xiang-yang, LU Xiao-wen, WU Jun-li
2000, 17(4): 224-227. doi: 10.11804/NuclPhysRev.17.04.224
Abstract:
Cooler Storage Ring (CSR), an upgrading program planned at the Heavy Ion Research Facility in Lanzhou (HIRFL), will supply beams with higher quality and intensity. Space charge effects should be considered due to this magnitude of intensity in CSR. The concept and some phenomena of space charge effects are discussed. Space charge intensity limit and space charge tune shift of normal CSR operation are given. It is of significance for the construction and operation of the future facility.
Cross Discipline
High Resolution Surface Analysis with Elastic Recoil Detection
LU Xiu-qin, FU Chang-bo, GUO Ji-yu, ZHAO Kui, LIANG Gang, LI Shu-yuan, LIU Jian-cheng, JIANG Hua
2000, 17(4): 228-230. doi: 10.11804/NuclPhysRev.17.04.228
Abstract:
High resolution depth profiling technique with elastic recoil detection analysis has been developed at the HI 13 tandem accelerator of CIAE. A depth resolution of 1.2 nm was achieved at the surface of the samples with the Q3D magnetic spectrometer and the focal plane detector. From light to medium heavy elements were simultaneous analyzed with a small Δ E E telescope. The method was applied to depth profile analysis of C/LiF multilayers, La 2SrCuO 4 superconductor and GaN foil samples.
Detection of Characteristic X-ray from Projectile Ions for Identification of Isobars in AMS
JIANG Song-sheng, HE Ming
2000, 17(4): 231-234. doi: 10.11804/NuclPhysRev.17.04.231
Abstract:
In recent years, a new technique to detect the charteristic X ray from projectile ions in accelerator mass spectrometry (AMS) has been developed. After analysis in the routine AMS system, the ions are stopped in an appropriately chosen target in steat of an ion detector and induced X ray are detected for identification of ions by atomic number. For the application of AMS to higher mass isotopes with mass number>20 using small accelerator, the characteristic X rays technique is better...
Study of Effects in Polyethylene Terephthalate Films Induced by 35 MeV/u Ar Ion Irradiation
LIU Chang-long, ZHU Zhi-yong, JIN Yun-fan, WANG Yan-bin, SUN You-mei, HOU Ming-dong, WANG Zhi-guang, LIU Jie, CHEN Xiao-xi, ZHANG Chong-hong
2000, 17(4): 235-239. doi: 10.11804/NuclPhysRev.17.04.235
Abstract:
Stacked polyethylene terephthalate films were irradiated with 35 MeV/u Ar ions at room temperature. The ion induced effects were studied by ultraviolet visible spectrometer, Fourier transform infrared spectroscopy, X ray diffractometer, X ray photoelectron spectroscopy, electron spin resonance spectroscopy and differential scanning calorimetry. Bond breaking and the formation of alkyne end groups and free radicals were observed. The bond breaking processes occurred mainly...
Channeling Radiation from High-energy Electrons and Positrons in Crystals
ZHANG Yong, YAO Shu-de, ZHOU Sheng-qiang, LIU Guang-zhi
2000, 17(4): 240-242. doi: 10.11804/NuclPhysRev.17.04.240
Abstract(2316) PDF (943KB)(461)
Abstract:
The channeling radiation of high energy electrons and positrons in crystals was introduced. According to the new idea proposed by A.V.Korol, the coherent radiation of ultra relativistic electrons and positrons channeled in periodically bent crystals was analyzed. The characteristics of the radiation were obtained by using classic electromagnetic theory and a tentative experimental plan for testing was suggested.
Radiation Curing—— New Technology of Green Industries Facing 21st Century
WANG Jian-guo, TENG Ren-rui
2000, 17(4): 243-247. doi: 10.11804/NuclPhysRev.17.04.243
Abstract:
The development of radiation curing was simply reviewed and the mechanism of UV curing and EB curing, the equipment and materials used in the radiation curing were also introduced. Compared with ordinary curing, the radiation curing has advantages of energy saving, high effectiveness and little pollution. It is a new technology of green industries facing the 21st century.
Application of Neutron Activation Analysis in Study of Ancient Ceramics
LI Guo-xia, ZHAO Wei-juan, GAO Zheng-yao, LI Rong-wu, XIE Jian-zhong, WU Xiao-li, YAO Gui-fang, HUANG Zhong-xiang, JIA Xiu-qin, HAN Song
2000, 17(4): 248-250. doi: 10.11804/NuclPhysRev.17.04.248
Abstract:
Trace-elements in ancient ceramics and imitative ancient ceramics were determined by neutron activation analysis (NAA). The NAA data are then analyzed by fuzzy cluster method and the trend cluster diagram is obtained.The raw material sources of ancient ceramics and imitative ancient ceramics are determined. The path for improving quality of imitative ancient ceramics is found.
Nuclear Energy and Nuclear Data File
Target Experiment, Radioactive Wastes Transmutation and Incineration of Nuclear Reactor Driven by Accelerator
DAI Guang-xi
2000, 17(4): 251-254. doi: 10.11804/NuclPhysRev.17.04.251
Abstract:
The recent progresses in accelerator driven nuclear subcritical nuclear reactor, especially in target experimental data have been reviewed.The data contained all the isotopes producing cross sections. The reaction products were identified whether they came from the spallation or fission reaction .
Study on Subcritical System Disposing Plutonium and High-level Actinides
SHEN Yao-song, LIU Cheng-an
2000, 17(4): 255-258. doi: 10.11804/NuclPhysRev.17.04.255
Abstract:
Disposition of the reactor plutonium and high level actinides by using accelerator driven subcritical reactor was studied theoretically and the corresponding core model using liquid Bi alloy as the reactor coolant was proposed. The satisfied numerical results of neutronics, burn up and radioactivity were obtained by the ADVBISON code.
Letter
Identification of New Nuclide 25P in Region of Proton Drip Line
XIAO Guo-qing, ZHAN Wen-long, GUO Zhong-yan, SUN Zhi-yu, LI Jia-xing, WANG Jin-chuan, WANG Quan-jin, MENG Xiang-wei, JIANG Shan-hong, NING Zhen-jiang, WANG Meng, CHEN Zhi-qiang, WANG Jian-feng, WANG Jian-song, TIAN Wen-dong, WANG Wu-sheng, Mao Rui-shi, Jin Gen-ming
2000, 17(4): 259-261. doi: 10.11804/NuclPhysRev.17.04.259
Abstract:
The mass distribution of the phosphor fragments induced by projectile fragmentation reaction of 69 MeV/u 36Ar + 9Be was measured at the projectile fragment separator RIBLL at IMP. The fragment products were identified by determining the magnetic rigidity Bρ , the time of flight tTOF and their energy loss ΔE . The experimental isotope distribution was compared to the result of the empirical parameterization EPAX. Three events for the new nuclide 25P in the...
Integrable Systems——Trace Formulas and Inverse-Spectroscopy
SONG Jian-jun, LI Xi-guo, LIU Fang, LI Shu-wei
2000, 17(4): 262-264. doi: 10.11804/NuclPhysRev.17.04.262
Abstract(1743) PDF (696KB)(484)
Abstract:
Periodic orbits of two dimensional uncoupled quartic oscillator were calculated by inte grating Hamiltonian equations of motion on reasonable tori, and several classical quantities were also computed. Inserting them into Berry Tabor trace formula, a trace, i.e., the semiclassical density of states of the corresponding quantum system, was obtained. Finally, Fourier transform was adopted to verify the contribution of each periodic orbit. Good agreement between the semiclassical ...