Beta-minus decay of exotic P and S isotopes with neutron number near 28
Beta-minus decay of exotic P and S isotopes with neutron number near 28
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中子数接近28的奇异P和S同位素的β-衰变
DOI：
10.1103/physrevc.106.064314
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发表时间：
2022
影响因子：
3.1
通讯作者：
et. al.
中科院分区：
文献类型：
--
作者：
Tripathi V.;Soumik B.;Shimizu N.;Utsuno Y.;et. al.
本文报道了在国家超导回旋加速器实验室使用由双面条形探测器环绕的三叶草探测器组成的Beta计数站（用于观察延迟跃迁）研究了非常富中子的P和S同位素的衰变。-衰变半衰期和延迟中子发射概率通过分析Si探测器中植入物和衰变事件之间的空间和时间相关性以及与跃迁的进一步吻合，提取了。延迟射线的检测允许首次识别负奇偶1p1h状态，也将父（）自旋/奇偶性限制为。对于所研究的大多数外来同位素，没有观察到与较轻的甚至是S同位素不同的强跃迁，因此暗示了Gamow-Teller强度分布向更高能量的转移。利用SDPFSDG-MU相互作用将实验观测与详细的壳模型计算进行比较，使我们能够推断出中子数接近和超过时第一禁跃迁的重要性和作用。
decay of very neutron-rich isotopes of P and S, studied at the National Superconducting Cyclotron Laboratory using the Beta Counting Station consisting of a Double Sided Strip Detector surrounded by clovers detectors for observing delayedtransitions, is reported here.-decay half-lives and delayed neutron emission probabilities were extracted forandby analyzing spatial and temporal correlations between implants and decay events in the Si detector with further coincidence withtransitions. Detection of delayedrays allowed for the identification of negative-parity 1p1h states infor the first time, also constraining the parent () spin/parity to. For the most exotic isotope studied,, no strongtransition was observed unlike lighter even-even S isotopes, thus implying the shift of Gamow-Teller strength distribution to higher energies. Comparison of experimental observations to detailed shell-model calculations using the SDPFSDG-MU interaction allowed us to infer the importance and role of first forbiddentransitions as the neutron number approaches and then exceeds.