Studies on electromagnetic dipole responses of atomic nuclei at RCNP

AAPPS Bulletin Pub Date : 2024-01-11 DOI:10.1007/s43673-023-00108-0

Atsushi Tamii, Nobuyuki Kobayashi

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Abstract

Electric dipole (E1) and spin-magnetic dipole (spin-M1) responses of nuclei have been studied by proton inelastic scattering experiments at forward angles, including zero degrees, at the Research Center for Nuclear Physics (RCNP) by employing a proton beam 295 or 392 MeV and the high-resolution magnetic spectrometer Grand Raiden. The E1 response of nuclei is the most fundamental nuclear response to the external field and is relevant to photo-nuclear reactions. After introducing the relevant nuclear matrix elements and the experimental methods, several recent experimental works are highlighted that include (E1) polarizability and the extraction of the symmetry energy parameters, pygmy dipole resonance, gamma-coincidence measurements, isoscalar and isovector spin-M1 excitations and the np spin correlation in the ground state, and gamma-emission probability for neutral current neutrino detection. A project, PANDORA, is introduced that aims at a systematic study of photo-nuclear reactions and decay branching ratios for light nuclei.

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在 RCNP 研究原子核的电磁偶极响应

核物理研究中心（RCNP）利用 295 或 392 MeV 的质子束和高分辨率磁谱仪 Grand Raiden，通过质子非弹性散射实验研究了原子核的电偶极子（E1）和自旋-磁偶极子（自旋-M1）反应。核的 E1 反应是核对外部场的最基本反应，与光核反应相关。在介绍了相关的核矩阵元素和实验方法之后，重点介绍了最近的几项实验工作，包括（E1）极化性和对称能参数的提取、侏儒偶极子共振、伽马入射测量、基态中的等速和等向自旋-M1激发和np自旋相关性，以及中性电流中微子探测的伽马发射概率。该项目旨在系统研究轻核的光核反应和衰变分支比。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AAPPS Bulletin

CiteScore

8.20

自引率

0.00%

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