论文标题
磁场对$^{40} $ Ca的巨型偶极子共振的影响使用EQMD模型
Impact of magnetic field on giant dipole resonance of $^{40}$Ca using the EQMD model
论文作者
论文摘要
通过考虑扩展量子分子动力学模型（EQMD）中的磁场，我们通过研究偶极矩的响应和强度来分析其对巨型偶极共振（GDR）的影响。选定的系统是$^{40} $ CA核，它通过$^{16} $ o通过库仑交互而激发。讨论了Liénard-Wiechert电位中的粒子加速度项，但是，这对磁场的影响很小。研究了$^{40} $ Ca作为梁能量的峰值能量，强度和宽度，温度和角动量。发现磁场增强了GDR的峰值能量，强度和宽度，这不仅是由于温度效应，而且还因为核的角动量的增强所致。在Beam Energy {E} $> $ 200 MEV/NOCLEON上，磁场维持GDR强度的恒定值。这项工作阐明了研究磁场在低中间能量重型离子碰撞中的重要作用。
By taking into account the magnetic field in the extended quantum molecular dynamics model (EQMD), we analyzed its effects on giant dipole resonance (GDR) by studying the responses and strengths of the dipole moments. The selected system is the $^{40}$Ca nucleus which is excited through the Coulomb interaction by $^{16}$O. Particle acceleration term in Liénard-Wiechert potential is discussed which, however, has small impact on magnetic field. The peak energy, strength and width of GDR, temperature, and angular momentum of $^{40}$Ca as a function of beam energy are investigated. It is found that the magnetic field enhances the peak energy, strength and width of GDR which is not only due to the temperature effects but also due to the enhancement of the angular momentum of nucleus. At beam energy {E} $>$ 200 MeV/nucleon, magnetic field maintains a constant value for the strength of GDR. The work sheds light on examining important roles of the magnetic field on nuclear structure in low-intermediate energy heavy-ion collisions.
