National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824-1321, USA.
Phys Rev Lett. 2011 Nov 11;107(20):202501. doi: 10.1103/PhysRevLett.107.202501. Epub 2011 Nov 7.
A new technique to measure (p,n) charge-exchange reactions in inverse kinematics at intermediate energies on unstable isotopes was successfully developed and used to study the (56)Ni(p,n) reaction at 110 MeV/u. Gamow-Teller transition strengths from (56)Ni leading to (56)Cu were obtained and compared with shell-model predictions in the pf shell using the KB3G and GXPF1A interactions. The calculations with the GXPF1A interaction reproduce the experimental strength distribution much better than the calculations that employed the KB3G interaction, indicating deficiencies in the spin-orbit and proton-neutron residual potentials for the latter. The results are important for improving the description of electron-capture rates on nuclei in the iron region, which are important for modeling the late evolution of core-collapse and thermonuclear supernovae.
一种新的技术，用于在不稳定同位素的中能反冲动力学中测量(p,n)电荷交换反应，已成功开发并用于研究 110MeV/u 下的(56)Ni(p,n)反应。得到了来自(56)Ni 到(56)Cu 的 Gamow-Teller 跃迁强度，并与 pf 壳层中使用 KB3G 和 GXPF1A 相互作用的壳模型预测进行了比较。与使用 KB3G 相互作用的计算相比，使用 GXPF1A 相互作用的计算更好地再现了实验强度分布，这表明后者的自旋轨道和质子-中子剩余势存在不足。这些结果对于改进铁区核电子俘获率的描述非常重要，因为这对于模拟核心坍缩和热核超新星的后期演化很重要。
