Enhancement of high-spin collectivity in N = Z nuclei by the isoscalar neutron-proton pairing

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• 作者：K. Kaneko^a ; Y. Sun^b ; ^c ; ^d ; ^{sunyang@sjtu.edu.cn} ; G. de Angelis^e
• 关键词：Neutron&ndash ; proton pairing ; Isospin invariance ; N=ZN=Z nuclei ; High-spin states ; Large-scale shell model
• 刊名：Nuclear Physics A
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：957
• 期：Complete
• 页码：144-153
• 全文大小：387 K
• 卷排序：957

文摘

Pairing from different fermions, neutrons and protons, is unique in nuclear physics. The fingerprint for the isoscalar T=0T=0 neutron–proton (np) pairing has however remained a question. We study this exotic pairing mode in excited states of rotating N≈ZN≈Z nuclei by applying the state-of-the-art shell-model calculations for 88Ru and the neighboring 90,92Ru isotopes. We show that the T=0T=0 np pairing is responsible for the distinct rotational behavior between the N=ZN=Z and N>ZN>Z nuclei. Our calculation suggests a gradual crossover from states with mixed T=1T=1 and T=0T=0 pairing near the ground state to those dominated by the T=0T=0 np pairing at high spins. It is found that the T=0T=0 np pairing plays an important role in enhancing the high-spin collectivity, thereby reducing shape variations along the N=ZN=Z line.