National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
Phys Rev Lett. 2010 May 28;104(21):212504. doi: 10.1103/PhysRevLett.104.212504.
We report on the first successful extraction of a β+ Gamow-Teller strength distribution from a radioactive isotope in an intermediate-energy charge-exchange experiment in inverse kinematics. The (7Li,7Be+γ(429 keV)) reaction at 100A MeV was used to measure Gamow-Teller transition strengths from 34P to states in 34Si. The results show that little mixing occurs between sd and pf shell configurations for the low-lying 0+ and 2+ states even though 34Si neighbors the island of inversion and low-lying 2ℏω intruder states exist. Shell-model calculations in the sdpf model space are consistent with these findings.
我们报告了首例在中能电荷交换逆动力学实验中从放射性同位素中提取β+ Gamow-Teller 强度分布的成功事例。在 100A MeV 下的（7Li,7Be+γ(429 keV)）反应中，我们测量了来自 34P 到 34Si 中态的 Gamow-Teller 跃迁强度。结果表明，尽管 34Si 紧邻反转岛且存在低激发 2ℏω 闯入态，但对于低激发的 0+ 和 2+ 态，sd 和 pf 壳组态之间几乎没有混合。在 sdpf 模型空间中的壳模型计算与这些发现一致。
