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Collective multipole excitations of exotic nuclei in relativistic continuum random phase approximation

Collective multipole excitations of exotic nuclei in relativistic continuum random phase approximation
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摘要 The isoscalar and isovector collective multipole excitations in exotic nuclei are studied in the framework of a fully self-consistent relativistic continuum random phase approximation (RCRPA). In this method the contri- bution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green's function. Different from the cases in stable nuclei, there are strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei. The neutron or proton excess pushes the centroid of the strength function to lower energies and increases the fragmentation of the strength distribution. The effect of treating the contribution of continuum exactly is also discussed. The isoscalar and isovector collective multipole excitations in exotic nuclei are studied in the framework of a fully self-consistent relativistic continuum random phase approximation (RCRPA). In this method the contri- bution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green's function. Different from the cases in stable nuclei, there are strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei. The neutron or proton excess pushes the centroid of the strength function to lower energies and increases the fragmentation of the strength distribution. The effect of treating the contribution of continuum exactly is also discussed.
出处 《Chinese Physics C》 SCIE CAS CSCD 2013年第12期32-37,共6页 中国物理C(英文版)
基金 Supported by National Natural Science Foundation of China(11175216,11275018,11305270) National Basic Research Program of China(2013CB834404) Science Planning Project of Communication University of China(XNL1207)
关键词 RPA multipole collective excitations CONTINUUM neutron-rich nucleus proton-rich nucleus RPA, multipole collective excitations, continuum, neutron-rich nucleus, proton-rich nucleus
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