Finite-temperature effects in magnetic dipole transitions

Finite-temperature effects in magnetic dipole transitions
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磁偶极子跃迁的有限温度效应

DOI:
10.1103/physrevc.109.024305
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发表时间:
2024
期刊:
影响因子:
3.1
通讯作者:
Kaur A
Kaur A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kaur A

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原子核电磁跃迁的有限温度效应有助于核结构和天体物理学相关核反应的许多方面。虽然电偶极子转变已经被广泛研究,但磁转变的温度敏感性仍然很大程度上未知。这项工作包括使用最近开发的自洽有限温度相对论准粒子随机相位近似 (FT-RQRPA) 在 0 到 2 MeV 的温度范围内研究自旋轨道 (SO) 伙伴态之间发生的等矢量磁偶极子激发 ()。同位素链的强度分布表现出相当大的温度依赖性。由于SO分裂能的降低和残余相互作用的减弱,强度峰值显着向较低能量移动,特别是在配对相关性消失的临界温度以上。通过探索有助于闭壳和开壳核强度的相关双准粒子构型,由于费米能级周围的热畅通效应,在低能和高能区域观察到SO伙伴之间新的质子和中子激发通道。在较高的温度下,我们注意到原子核中出现了一个有趣的结果,即激发的出现,由于完全占据(或完全空置)的自旋轨道伙伴态,激发在零温度下是被禁止的。
Finite-temperature effects in electromagnetic transitions in nuclei contribute to many aspects of nuclear structure and astrophysically relevant nuclear reactions. While electric dipole transitions have already been extensively studied, the temperature sensitivity of magnetic transitions remains largely unknown. This work comprises the study of isovector magnetic dipole excitations () occurring between spin-orbit (SO) partner states using the recently developed self-consistent finite-temperature relativistic quasiparticle random-phase approximation (FT-RQRPA) in the temperature range from0 to 2 MeV. Thestrength distributions ofandisotopic chains exhibit a considerable temperature dependence. Thestrength peaks shift significantly towards the lower energies due to the decrease in SO splitting energies and weakening of the residual interaction, especially above the critical temperatures where the pairing correlations vanish. By exploring the relevant two-quasiparticle configurations contributing to thestrength of closed- and open-shell nuclei, new proton and neutron excitation channels between SO partners are observed in low- and high-energy regions due to the thermal unblocking effects around the Fermi level. At higher temperatures, we have noticed an interesting result innuclei, the appearance ofexcitations, which are forbidden at zero temperature due to fully occupied (or fully vacant) spin-orbit partner states.
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