利用多普勒移动衰减法研究<sup>46</sup>Ti核的激发态能级寿命

利用多普勒移动衰减法研究⁴⁶Ti核的激发态能级寿命

摘要: 原子核的能级寿命直接反映了其内部的结构信息，是核性质研究中一个十分重要的物理参量。本工作报道了依托兰州重离子加速器装置，首次采取多普勒移动衰减法(DSAM)开展的原子核能级寿命测量。采取核反应_^12\rmC(_^36\rmAr, 2p)来布居_^46\rmTi的高激发态，利用新组建的大型高纯锗(HPGe)探测器阵列进行符合测量。根据\gamma能谱分别提取了4^+、5^-、6^-态的能级寿命，并得到了这些态的跃迁概率。理论上采取大规模组态混合壳模型进行计算，并得出了能级的组态信息。

Abstract: 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\rmTi were populated by the _^12\rmC(_^36\rmAr, 2p) reaction, and coincidence measurements were performed by the newly upgraded HPGe detector array. Lifetimes of 4⁺, 5⁻, and 6⁻states 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.