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Studies on the Lifetimes of 46Ti Excited States via the Doppler Shift Attenuation Method
Jilehu GADA, Mengran XIE, Jianguo LI, Guangshun LI, ROHILLA Aman, Pengcong MA, Fanfei ZENG, Hao HUANG, Pengsong ZHENG, Jianguo WANG, Yunhua QIANG, Minliang LIU, Song GUO, Bing DING, Wenqiang ZHANG, Yongde FANG, Xiaohong ZHOU, Tianxiao LI, Wei HUA, Hao CHENG
2023, 40(2): 193-197. doi: 10.11804/NuclPhysRev.40.2023021  Published:2023-06-20
Keywords: lifetime, DSAM, shell model calculation, level configuration
Lifetimes of nuclear excited states are related to its internal structure, and considered as one of most important values in the nuclear property studies. In this paper, we report the first lifetime measurements of nuclear excited states at the HIRFL facility via Doppler Shift Attenuation Method(DSAM). The excited states of $_{}^{46}{\rm{Ti}}$ were populated by the $_{}^{12}{\rm{C}}$($_{}^{36}{\rm{Ar}}$, 2p) reaction, and coincidence measurements were performed by the newly upgraded HPGe detector array. Lifetimes of 4+, 5, and 6states were extracted from the gated spectra, and corresponding transition probabilities were deduced. Further theoretical calculations have been performed using the large scale configuration-mixing shell model, and configurations of those states are suggested.
Study on Compton-suppressed Phoswich Gamma-ray Detector of LaBr3(Ce)-CsI(Tl)
Tianxiao LI, Hongyi WU, Yun ZHENG, Congbo LI, Lihua ZHU, Xiaoguang WU, Jingbin LU, Min ZHENG, Zihao ZHAO, Ruofu CHEN, Jiande WEI
2023, 40(1): 73-77. doi: 10.11804/NuclPhysRev.40.2022021  Published:2023-03-20
Keywords: phoswich gamma-ray detector, LaBr3(Ce), CsI(Tl), pulse shape identification, Monte Carlo simulation
In this work, a compact phoswich detector consisting of a cylindrical LaBr3(Ce) principal crystal and a well-shaped CsI(Tl) sub-crystal was designed and assembled to identify and reject Compton scattering in the LaBr3(Ce). Two different crystals coupled to the same photomultiplier tube (PMT). The energy deposition in each layer from incident radiation is then determined via digital pulse shape analysis of the PMT’s pulses. The results of Geant4 simulations were used to verify the performance of the pulse shape identification and the effect of Compton background suppression. Experimental tests were conducted on the detector prototype using a 60Co gamma source, and the result shown that the detector background suppression coefficient was 2.33(1) which achieved the expected purpose of twice as much as the Compton background was suppressed.