β-Delayed γ Emissions of 26P and Its Mirror Asymmetry

Hao Jian,Zhaozhan Zhang,Jiajian Liu,Weiqing Yang,Ying Jiang,Yang Liu,Minliang Liu,Meng Wang,Jianguo Wang,Peng Wang,Yufeng Wang,Pengjie Li,Haohan Sun,Yufeng Gao,Xiang Wang,Qiang Hu,Xiaoyu Wang,Jinhai Li,Yuhu Zhang,Zhengguo Hu,Zhihuan Li,Latsamy Xayavong,Rui Fan,Ren Li,Kazunari Kaneko,H L Zang ,Y H Lam ,C X Yuan ,Zhiyong Bai ,Qiong Zhao ,Q Gao ,Peiwei Wen ,L Yang ,D Patel ,H Y Wu ,S X Zha ,Dongxi Wang ,Fuchu Dai ,J.b Ma ,Yuechao Yu ,Kang Wang ,X H Zhou ,Gaolong Zhang ,Qiaogen Zhou ,D W Luo ,Gen-Hua Shi ,D S Hou ,C J Lin ,Yan Feng ,F P Zhong ,Zhihao Gao ,C G Wu ,Guoyang Yu ,P F Liang ,Jiansong Wang ,H S Xu ,L J Sun ,Yang Sun ,H M Jia ,S L Jin ,Wendong Ma ,Pingchuan Ma ,Jenny Lee ,Hailin Zhu ,Y Yang ,F F Duan ,H.j Ong ,Liming Hu ,Min Pan ,Chen Ruo-Fu ,X X Xu ,Nan-Ru Ma

doi:10.3390/sym13122278

Abstract

The study of the origin of asymmetries in mirror β decay is extremely important to understand the fundamental nuclear force and the nuclear structure. The experiment was performed at the National Laboratory of Heavy Ion Research Facility in Lanzhou (HIRFL) to measure the β-delayed γ rays of 26P by silicon array and Clover-type high-purity Germanium (HPGe) detectors. Combining with results from the β decay of 26P and its mirror nucleus 26Na, the mirror asymmetry parameter δ ( ≡ft+/ft−− 1) was determined to be 46(13)% for the transition feeding the first excited state in the daughter nucleus. Our independent results support the conclusion that the large mirror asymmetry is close to the proton halo structure in 26P.

Highlights

In 1932, Heisenberg introduced the elegant concept of isospin, which described the charge-independence of nucleons in nuclei, namely, he considered protons and neutrons the same particles in different states [1]
The branching ratio of the proton-bound excited energy level was deduced from the related γ-ray intensities: BR = Iout − Iin where Iout (Iin) is the total intensity of γ ray observed decaying from the energy level in the present experiment
The experiment was carried out using the RIBLL1 facility at Heavy Ion Research Facility in Lanzhou (HIRFL) to study the β decays of proton-rich nuclei 26P

Summary

Introduction

In 1932, Heisenberg introduced the elegant concept of isospin, which described the charge-independence of nucleons in nuclei, namely, he considered protons and neutrons the same particles in different states [1]. This has been proven valuable in simplifying the construction of the nucleon–nucleon interactions in nuclear models, as well as in describing both systematic and specific features of nuclear structures [2]. Frequently implies new physics, and the systematic study of the origin of breaking is extremely important for a deeper understanding of the fundamental nuclear force and the nuclear structure. The ground states of the particle-bound nuclei 73Sr and 73Br appeared to have Jπ=5/2− and Jπ=1/2−, respectively

Methods

Discussion

Conclusion