近质子滴线核28S的<inline-formula>\beta <img text_id='Z-20210602120137' class='formula-img' style='display:none;' src='2020-84N_Z-20210602120137.jpg'><alternatives></alternatives></inline-formula>延迟<inline-formula>\gamma <img text_id='Z-20210602113114' class='formula-img' style='display:none;' src='2020-84N_Z-20210602113114.jpg'><alternatives></alternatives></inline-formula>衰变研究

近质子滴线核²⁸S的\beta 延迟\gamma 衰变研究

摘要: 在兰州重离子研究装置上，依托兰州放射性束流线，产生、分离和鉴别了同位旋第三分量 T_Z=-2 的近质子滴线核²⁸S，并通过使用包括双面硅条探测器和高纯锗探测器在内的探测阵列，开展了²⁸S的\beta延迟\gamma衰变测量。实验准确测量了²⁸S衰变中的5条\beta延迟\gamma射线，得到了子核²⁸P相应能级的能量。首次提取出了\beta衰变布居到²⁸P低激发态的衰变分支比，并构筑了²⁸S的全新部分衰变纲图。本工作为将来进一步比较²⁸S和²⁸Mg间的镜像不对称性提供了精确的实验数据。

Abstract: The nucleus ²⁸S (isospin projection T_Z=-2 ) near the proton drip-line was produced, separated and purified by HIRFL-RIBLL1 facility and the measurement of \beta-delayed \gamma decay of ²⁸S was performed using a detector array consisted of double-sided silicon detectors and Clover-type high purity germanium detectors. Five \gamma transitions from \beta decay of ²⁸S were precisely measured and the corresponding energies of the states of daughter ²⁸P were obtained. The branch ratios of low-lying states of ²⁸P populated by \beta decay were extracted for the first time and the new partial ²⁸S \beta-decay scheme was deduced. This work provides accurate data for the further study of mirror asymmetry in ²⁸S/²⁸Mg.