Lifetime measurements of states of S 35 , S 36 , S 37 , and S 38 using the AGATA ? -ray tracking spectrometer
Lifetime measurements of states of S 35 , S 36 , S 37 , and S 38 using the AGATA ? -ray tracking spectrometer
复制标题
使用 AGATA? 对 S 35、S 36、S 37 和 S 38 状态进行寿命测量。
DOI：
10.1103/physrevc.106.024314
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发表时间：
2022
影响因子：
3.1
通讯作者：
Grocutt L
中科院分区：
文献类型：
--
作者：
Grocutt L
用微分反冲距离法测量了硫同位素36、37和38的少数激发态的寿命或寿命极限。在科隆柱塞装置中，用能量为225 MeV的离子束照射薄靶，引发硫同位素的双掠射反应。PRISMA磁谱仪和早期实施的AGATA射线跟踪阵列的组合被用来探测与射弹样核素一致的粒子。在约1至100 ps的范围内测量填充状态的寿命测量。寿命测量或寿命限制可能的状态数量受到统计学的限制。对于，寿命确定为在1572千电子伏的第一状态，结果与以前公布的寿命值进行比较。在4193 keV的状态的寿命进行了测定，并与早期的测量进行了比较。没有以前的寿命信息存在的（）状态在6690千电子伏的寿命测量与大的相关误差，在目前的工作。对于，建立寿命极限的状态是那些在646千电子伏与和在2776千电子伏与;有没有以前公布的激发态的寿命值。最后，在3675千电子伏的状态的寿命限制，没有寿命信息存在于文献中的这种状态。测量的寿命值进行了比较，与最先进的壳模型计算的PSDPF，SDPF-U，和FSU有效的相互作用的基础上的结果。此外，核磁偶极子和电四极矩，分支比，混合比，和电磁跃迁率，在可用的情况下，已与壳模型值进行了比较。目前的工作遭受统计数据不佳，然而，寿命值和限制是可能的，允许一个有用的讨论的能力，国家的最先进的壳模型计算重现实验结果。
Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam ofions of energy 225 MeV incident on a thintarget which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA-ray tracking array was used to detectrays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For, the lifetime was determined for the firststate at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of thestate ofat 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the () state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For, the states for which lifetime limits were established were those at 646 keV withand at 2776 keV with; there are no previously published lifetime values for excited states of. Finally, a lifetime limit was established for thestate ofat 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.