First proton-pair breaking in semi-magic nuclei beyond 132 Sn and 208 Pb: Configuration of the long-lived isomer of 217 Pa
First proton-pair breaking in semi-magic nuclei beyond 132 Sn and 208 Pb: Configuration of the long-lived isomer of 217 Pa
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DOI：
10.1103/physrevc.87.014309
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发表时间：
2013-01
影响因子：
3.1
通讯作者：
A. Astier;M. Porquet
中科院分区：
文献类型：
--
作者：
A. Astier;M. Porquet
132Sn区和208Pb区的壳层结构非常相似，这是众所周知的现象。因此，利用位于Z=50和Z=82壳层间隙上方的高j轨道之间的对应关系，我们讨论了在N=82和N=126的同位素中，具有一个破裂的质子对的完全对齐态的演化。三十多年前，人们在217Pa中发现了一个长寿命的异构态，尽管另外两个实验给出了新的实验结果，但关于它的主要性质(自旋、宇称、构型)的讨论仍然没有定论。然后，通过与最近在139La中测得的i^\pi=17/2^+异构态的比较，将217pa的异构态指定为(pi h9/2})2(pi f7/2})1组态的完全对齐态。
The close similarity between the shell structures in the 132Sn and 208Pb regions is a well known phenomenon. Thus, using the correspondence between the high-j orbits located above the Z=50 and Z=82 shell gaps, we discuss the evolutions of the fully aligned states with one broken proton pair in the N=82 and N=126 isotones. A long-lived isomeric state was discovered in 217Pa more than thirty years ago and despite two other experiments giving new experimental results, the discussions on its main properties (spin, parity, configuration) remained inconclusive. Then, using the comparison with the I^\pi=17/2^+ isomeric state recently measured in 139La, the isomeric state of 217Pa is assigned as the fully aligned state of the (\pi h_{9/2})2(\pi f_{7/2})1 configuration.