Giant dipole resonance in proton capture reactions using an extended quantum molecular dynamics model

Abstract

Proton capture reaction is an important process concerning the astrophysical origin of the elements. In present work, we focus on giant dipole resonance (GDR) in proton capture reactions, such as40 Ca, and 67 Co(p, γ) 68 Ni in a framework of an extended quantum molecular dynamics model. The systematic properties of GDR parameters including the peak energy, the strength and full width at half maximum (FWHM) have been studied. The dependence of FWHM on temperature has also been discussed. Some comparisons with experimental data have been presented.

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

“…On the other hand, the α-clustering phenomenon as a novel nuclear structure has received great attention in recent years. An extended quantum molecular dynamics model [21], as one of a few microscopic transport models which can give α-clusters with a nice computation performance, has succeeded in describing multifragmentation [22], giant dipole resonance [23][24][25][26], photonuclear reactions [27] as well as collective flow and shear viscosity etc [28,29] at Fermi energy. In comparison with the traditional QMD-type model and its many applications [30][31][32][33][34][35][36][37][38][39][40][41], the EQMD model has been improved in some aspects.…”

α-clustering effects in relativistic heavy-ion collisions

“…针对 α 集团结构的理论已 经有长足发展，如 α 团簇模型 (共振群方法和生成 坐标方法), 分子动力学方法 (反对称分子动力学模 型、费米子分子动力学模型、扩展量子分子动力学 模型 (EQMD) [77])、从头计算方法 [79]、动力学对 称性模型 [80]等. 国内的学者近年来在原子核 α 集 团结构相关实验与理论也取得了不少重要进展，例 如在理论上的发展 [75,77,78,[81][82][83][84][85][86][87][88][89], 以及实验上的 测量 [90][91][92][93], 详细的综述可以参考文献 [72,94,95].…”

Nuclear Collective Dynamics in Transport Model With the Lattice Hamiltonian Method

“…where q r + s 2 , r − s 2 = r + s 2 |q| r − s 2 represents the matrix element ofq in coordinate space. By substituting Equation (53) and the inverse transform of Equation (54) into Equation 52, the expectation ofQ can be written in the form…”

“…In particular, the two-particle-twohole (2p-2h) correlation beyond the mean-field approximation, which dominates the collisional damping of nuclear giant resonances, can be effectively taken into account in transport models via binary collisions. The literature contains many works that study nuclear giant resonances based on the pure Vlasov equation [47][48][49], the Vlasov equation with a collision relaxation time [50], and the full transport model with both the meanfield and the NN scatterings [51][52][53]. For example, based on simulations of transport models, the excitation energies of nuclear giant resonances have been used to extract information on the nuclear EOS and neutron-proton effective mass splitting [54], while the width of nuclear giant dipole resonance (GDR) has been proposed as an effective probe of the in-medium NN elastic cross-section [55].…”