Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W
Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W
复制标题
双质子滴注线的衰变光谱：新核素 160Os 和 156W 的放射性
DOI：
10.1016/j.physletb.2023.138310
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发表时间：
2023
影响因子：
4.4
通讯作者：
Briscoe A
中科院分区：
文献类型：
--
作者：
Briscoe A
本文在Jyväskylä大学加速器实验室对双质子滴注线上的76 160 o84和74 156 w82的放射性进行了测量。用310 MeV的58 Ni离子束轰击106 Cd靶，诱导聚变蒸发反应生成了160 Os核。在飞行过程中，利用反冲分离器MARA分离出160个Os离子，并将其注入双面硅条探测器中，用于测量其衰变。测定了160 Os基态（E α= 7092 (15) keV, t1 /2= 97−32+ 97 μs）及其异构体态（E α= 8890 (10) keV, t1 /2= 41−9+ 15 μs）的α衰变，确定了异构体的激发能为1844 (18)keV。对其α-衰变性质和激发能进行了系统比较。α衰变与随后的衰变相关联，以研究156 W基态的β衰变，结果表明，与它的同工异构不同，两个低洼异构体都分布在它的子核素156 Ta中。用相同的实验系统，用102 Pd靶，得到了73 156 Ta 83中质子衰变高自旋同分异构体态的半衰期（333−22+ 25 ms）的改进值。这一结果可用于提高156w的半衰期测定精度，其测量值为157−34+ 57 ms。
The radioactivity of 76 160 Os 84 and 74 156 W 82 that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyväskylä. The 160 Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV 58 Ni ions bombarding a 106 Cd target. The 160 Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The α decays of the ground state of 160 Os (E α= 7092 (15) keV, t 1/2= 97− 32+ 97 μs) and its isomeric state (E α= 8890 (10) keV, t 1/2= 41− 9+ 15 μs) were measured, allowing the excitation energy of the isomer to be determined as 1844 (18) keV. These α-decay properties and the excitation energy of the isomer are compared with systematics. The α decays were correlated with subsequent decays to investigate the β decays of the ground state of 156 W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, 156 Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in 73 156 Ta 83 of 333− 22+ 25 ms was obtained in a separate experiment using the same experimental systems with a 102 Pd target. This result was employed to improve the precision of the half-life determined for 156 W, which was measured as 157− 34+ 57 ms.