论文标题
中子丰富的$ n \ yout56 $ nuclei的集体激发中的八极相关性
Octupole correlations in collective excitations of neutron-rich $N\approx56$ nuclei
论文作者
论文摘要
基于核密度功能理论的相互作用的玻色子模型（IBM）中，研究了富含中子的核与中子数$ n \大约56 $的中子数$ n \大约56 $的八晶石相关性。使用通用能量密度和配对相互作用的受约束的自搭配平均场（SCMF）计算以轴对称的四极杆和八振长的变形为均匀的二核和八个核的变形，以提供势能表面$^{92-100} $ zr和$^{94-102} $ mo。然后将SCMF能量表面映射到玻色子冷凝水状态的IBM版本的能量期望值上，该版本由中子和质子单调$ s $，四倍$ D $和Octupole $ f $ bosons组成。此过程确定了IBM Hamiltonian的强度参数，该参数用于计算相关的光谱特性。在SCMF级别上，未获得八杆杆变形的基态，而八杆$ n \约56 $中的八极变形中的能量表面通常柔软。带有带头状态$ 3^-_ 1 $的预测的负元元乐队薄弱地取决于$ n $，并且在每个考虑的同位素链中的能量最低，$ n = 56 $。该模型进一步预测了最低的负态和正态晶体之间有限的电八极转变率。
Octupole correlations in the low-energy collective states of neutron-rich nuclei with the neutron number $N\approx56$ are studied within the interacting boson model (IBM) that is based on the nuclear density functional theory. The constrained self-consistent mean-field (SCMF) calculations using a universal energy density functional and a pairing interaction provide the potential energy surfaces in terms of the axially-symmetric quadrupole and octupole deformations for the even-even nuclei $^{86-94}$Se, $^{88-96}$Kr, $^{90-98}$Sr, $^{92-100}$Zr, and $^{94-102}$Mo. The SCMF energy surface is then mapped onto the energy expectation value of a version of the IBM in the boson condensate state, which consists of the neutron and proton monopole $s$, quadrupole $d$, and octupole $f$ bosons. This procedure determines the strength parameters of the IBM Hamiltonian, which is used to compute relevant spectroscopic properties. At the SCMF level, no octupole deformed ground state is obtained, while the energy surface is generally soft in the octupole deformation at $N\approx56$. The predicted negative-parity yrast bands with the bandhead state $3^-_1$ weakly depend on $N$ and become lowest in energy at $N=56$ in each of the considered isotopic chains. The model further predicts finite electric octupole transition rates between the lowest negative- and the positive-parity ground-state bands.
