Isovector giant dipole resonances in proton-rich Ar and Ca isotopes

Isovector giant dipole resonances in proton-rich Ar and Ca isotopes
复制标题

富质子 Ar 和 Ca 同位素中的等向量巨偶极子共振

DOI:
10.1088/1674-1137/abdfbc
复制
发表时间:
2021-01
期刊:
Chinese Physics. C
影响因子:
--
通讯作者:
Cao Ligang
Cao Ligang
中科院分区:
其他
文献类型:
--
作者:
Liu Ling;Liu Shuai;Zhang Shisheng;Cao Ligang

文献摘要

参考文献

相似文献

用共振连续谱Hartree-Fock+BCS(HF+BCS)和准粒子无规相位近似(QRPA)方法系统研究了富质子Ar和Ca同位素的等矢量巨偶极共振(IVGDR). Skyrme SLy 5和密度依赖的接触配对相互作用在计算中使用。除了能量在18 MeV附近的巨偶极共振外,还发现了位于12 MeV以下能量区域的侏儒偶极共振(PDR)。计算得到的质子滴线附近核的PDR能量加权矩约为TRK求和规则的4%。强度随着每个同位素链中质量数的增加而减小。PDR态的跃迁密度表明,质子和中子在核内部的运动是同相的,而质子在表面的贡献最大。通过分析质子和中子2-准粒子组态的QRPA振幅,我们发现只有少数质子组态对低激发态的QRPA振幅有显著贡献。它们对QRPA总振幅的贡献约为95%,这表明在本研究中丰质子核中PDR态的集体性不强。
The isovector giant dipole resonances(IVGDR) in proton-rich Ar and Ca isotopes have been systematically investigated using the resonant continuum Hartree-Fock+BCS(HF+BCS) and quasiparticle random phase approximation(QRPA) methods. The Skyrme SLy5 and density-dependent contact pairing interactions are employed in the calculations. In addition to the giant dipole resonances at energy around 18 MeV, pygmy dipole resonances(PDR) are found to be located in the energy region below 12 MeV. The calculated energy-weighted moments of PDR in nuclei close to the proton drip-line exhaust about 4% of the TRK sum rule. The strengths decrease with increasing mass number in each isotopic chain. The transition densities of the PDR states show that motions of protons and neutrons are in phase in the interiors of nuclei, while the protons give the main contribution at the surface. By analyzing the QRPA amplitudes of proton and neutron 2-quasiparticle configurations for a given low-lying state, we find that only a few proton configurations give significant contributions. They contribute about 95% to the total QRPA amplitudes, which indicates that the collectivity of PDR states is not strong in proton-rich nuclei in the present study.
DOI: 10.1088/1674-1137/37/12/124102
发表时间: 2013-09
期刊: Chinese Physics C
影响因子: 3.6
作者:
YANG Ding;Cao Ligang;Ma Zhongyu
通讯作者: Ma Zhongyu
DOI: 10.1140/epja/i2016-16176-0
发表时间: 2015-09
期刊: The European Physical Journal A
影响因子: --
作者:
Y. Kim;P. Papakonstantinou
通讯作者: Y. Kim;P. Papakonstantinou
DOI: 10.1103/physrevc.85.024601
发表时间: 2011-12
期刊: Physical Review C
影响因子: 3.1
作者:
X. Roca-Maza;G. Pozzi;M. Brenna;K. Mizuyama;G. Colò
通讯作者: X. Roca-Maza;G. Pozzi;M. Brenna;K. Mizuyama;G. Colò
富中子核中的低能等向量和等标量偶极子响应
DOI: 10.1103/physrevc.85.044317
发表时间: 2012-02
期刊: Physical Review C
影响因子: 3.1
作者:
Vretenar, D.;Niu, Y. F.;Paar, N.;Meng, J.
通讯作者: Meng, J.
DOI: 10.1088/0034-4885/70/5/r02
发表时间: 2007-01
影响因子: 18.1
作者:
N. Paar;D. Vretenar;E. Khan;G. Colò
通讯作者: N. Paar;D. Vretenar;E. Khan;G. Colò