Lifetime measurement of the 21+ state in 74Rb and isospin properties of quadrupole transition strengths at N = Z
Lifetime measurement of the 21+ state in 74Rb and isospin properties of quadrupole transition strengths at N = Z
复制标题
74Rb 中 21+ 态的寿命测量以及 N=Z 处四极跃迁强度的同位旋特性
DOI：
10.1016/j.physletb.2018.10.064
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发表时间：
2018
影响因子：
4.4
通讯作者：
K. Wimmer
中科院分区：
文献类型：
--
作者：
C. Morse;H. Iwasaki;A. Lemasson;A. Dewald;T. Braunroth;V. Bader;T. Baugher;D. Bazin;J. Berryman;C. Campbell;A. Gade;C. Langer;I. Lee;C. Loelius;E. Lunderberg;F. Recchia;D. Smalley;Steven Ragnar Stroberg;R. Wadsworth;C. Walz;D. Weisshaar;A. Westerberg;K. Whitmore;K. Wimmer
在A_（70-80）区的自共轭核由于其形状共存和集体性沿着N= Z线增加等现象而引起了人们的广泛关注。我们调查的结构，在这一地区的核通过使用GRETINA阵列的寿命测量。通过对74 Kr中著名的B（E2; 2 1+→ 0 1+）跃迁强度的测量，首次实现了快速放射性束的微分反冲距离多普勒频移技术。然后用该方法测定了N= Z核中最重的奇-奇核74 Rb的B（E2; 2 1+→ 0 1+）跃迁强度。这一结果和沿着N= Z的扩展系统学表明，在自共轭核中，四极跃迁强度的等腰比例部分占主导地位，以及在74 Rb中可能存在形状共存。
Self-conjugate nuclei in the A≈ 70–80 region have attracted a great deal of attention due to phenomena such as shape coexistence and increasing collectivity along the N= Z line. We investigate the structure of nuclei in this region through lifetime measurements using the GRETINA array. The first implementation of the Differential Recoil Distance Doppler Shift technique with fast radioactive beams is demonstrated and verified through a measurement of the well-known B (E 2; 2 1+→ 0 1+) transition strength in 74 Kr. The method is then applied to determine the B (E 2; 2 1+→ 0 1+) transition strength in 74 Rb, the heaviest odd–odd N= Z nucleus for which this quantity has been determined. This result and extended systematics along N= Z suggest the dominance of the isoscalar part of the quadrupole transition strengths in self-conjugate nuclei, as well as the possible presence of shape coexistence in 74 Rb.