用库仑激发探测50Ca的矮偶极子共振

IF 1.7 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A Pub Date : 2025-05-13 DOI:10.1016/j.nuclphysa.2025.123152

J. Lemarié , Y. Togano , T. Nakamura , T. Kobayashi , T. Aumann , H. Baba , K. Boretzky , A. Bracco , F. Browne , F. Camera , H. Chae , S. Chan , N. Chiga , H. Choi , L. Cortés , F. Delaunay , D. Dell'Aquila , Z. Elekes , Y. Fujino , I. Gašparić , K. Yoneda

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引用次数: 0

摘要

在RIKEN - RIBF进行了逆运动学库仑激励测量50Ca电偶极子响应的实验。SAMURAI光谱仪、γ射线探测器阵列CATANA与NeuLAND演示器和NEBULA联合用于中子探测，可以用不变质谱法重建激发能谱。研究了50Ca→49Ca+n和50Ca→48Ca+n+n反应通道。1中子发射通道在低中子相对能量处的一个尖峰可能是矮偶极子共振的候选者。γ射线和中子能量的相关性表明50Ca弹丸的衰变可能存在结构效应。

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Probing the pygmy dipole resonance of 50Ca by Coulomb excitation

An experiment to measure the electric dipole response of ⁵⁰Ca by Coulomb excitation in inverse kinematics has been carried out at RIKEN - RIBF. The combination of the SAMURAI spectrometer, the γ-ray detector array CATANA and both NeuLAND demonstrator and NEBULA for neutron detection allow to reconstruct the excitation energy spectra by invariant mass spectroscopy.

The reaction channels ⁵⁰Ca → ⁴⁹Ca+n and ⁵⁰Ca → ⁴⁸Ca+n+n have been investigated. One sharp peak at low neutron relative energy for the 1 neutron emission channel may be a candidate for a Pygmy Dipole Resonance. Correlation of γ-ray and neutron energy shows possible structure effect in the decay of the ⁵⁰Ca projectile.

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来源期刊

Nuclear Physics A 物理-物理：核物理

CiteScore

3.60

自引率

7.10%

发文量

113

审稿时长

61 days

期刊介绍： Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.