摘要
The beyond mean-field approach for low-lying hypernuclear states is extended by mixing the configurations associated with both single-particle and quadrupole-octupole collective excitations within the generator coordinate method based on a covariant den-sity functional theory.The method is demonstrated in the application to the low-lying states of 21ΛNe,where the configurations with theΛhyperon occupying the first(Λ_(s))and second(Λ_(p))lowest-energy states are considered.The results indicate that the positive-parity states are dominated by theα+^(12)C+α+Λ_(s) structure.In contrast,the low-lying negative-parity states are domi-nated by a strong admixture ofα+16O+Λ_(s) structure andα+12C+α+Λ_(p) structure due to the inclusion of octupole correlations.As a result,the low-lying negative-parity states become much lower than what is expected from the previous studies without the mixing,and the electric multipole transition strengths are significantly quenched.
基金
supported by the Science and Technology Project of Hebei Education Department(Grant No.ZC2021011)
Scientific Research and Development Planning Project of Handan City(Grant No.21422901160)
supported by the National Natural Science Foundation of China(Grant No.12005082)
Jiangxi Provincial Natural Science Foun-dation(Grant No.20202BAB211008)
Jiangxi Normal University(JXNU)Initial Research Foundation Grant to Doctor(Grant No.12019504)
Young Talents Program under JXNU(Grant No.12019870)
partially supported by the National Natural Science Foundation of China(Grant No.12141501)
Fundamental Research Funds for Central Universities,Sun Yat-sen University.
