A close look at the competition of isovector and isoscalar pairing in A=18 and 20 even-even N≈Z nuclei |
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引用本文: | 潘峰,周丹,杨思雨,Grigor Sargsyan,赫英雯,Kristina D.Launey,Jerry P.Draayer.A close look at the competition of isovector and isoscalar pairing in A=18 and 20 even-even N≈Z nuclei[J].中国物理C(英文版),2019,43(7):074106-074106-9. |
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作者姓名: | 潘峰 周丹 杨思雨 Grigor Sargsyan 赫英雯 Kristina D.Launey Jerry P.Draayer |
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摘 要: | competition of isovector and isoscalar pairing in A=18 and 20 even-even N≈Z nuclei is analyzed in the framework of the mean-field plus the dynamic quadurpole-quadurpole, pairing and particle-hole interactions, whose Hamiltonian is diagonalized in the basis U(24) ?(U(6) ? S U(3) ? S O(3))■(U(4) ? S US(2)■ S UT(2)) in the L = 0 configuration subspace. Besides the pairing interaction, it is observed that the quadurpole-quadurpole and particlehole interactions also play a significant role in determining the relative positions of low-lying excited 0~+ and 1~+ levels and their energy gaps, which can result in the ground state first-order quantum phase transition from J = 0 to J = 1.The strengths of the isovector and isoscalar pairing interactions in these even-even nuclei are estimated with respect to the energy gap and the total contribution to the binding energy. Most importantly, it is shown that although the mechanism of the particle-hole contribution to the binding energy is different, it is indirectly related to the Wigner term in the binding energy.
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收稿时间: | 2019-07-01 |
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