Measurement of the low energy 25Mg(p,γ)26Al resonances

J Su ,Yinji Chen,Yunju Li,Xinyue Li,Weiping Liu,Liyong Zhang,Chen Chen,Hao Zhang,Bing Guo,Zhihong Li,Long Zhang,Ertao Li ,Gang Liu ,Y P Shen ,Jiajia He ,Y D Sheng ,F Q Cao ,Luohuan Wang

doi:10.1051/epjconf/202226008002

Abstract

The cosmic 1.809 MeV γ-ray emitted by the radioactive nucleus 26Al in the Galaxy is one of the key observation targets of the γ-ray astronomy. The 26Al is mainly produced by the 25Mg(p,γ)26Al reaction in the stellar Mg-Al reaction cycle. At the astrophysical relevant temperatures, the reaction rates of 25Mg(p,γ)26Al are dominated by several narrow resonances at low energy. This work reports a measurement of the low energy 25Mg(p,γ)26Al resonances at Jinping Underground Nuclear Astrophysics experimental facility (JUNA) in the China Jinping Underground Laboratory (CJPL).

Highlights

The 1.809 MeV γ-ray emitted from the radioactive decay of 26Al in the interstellar medium of the Galaxy has been observed by several satellites [1,2,3]
The fitting process is 1) Initial primary γ-ray branching ratios were fed in the GEANT4 simulation to produce a single spectrum, and 2) The simulation result was compared with the experimental data and the deviations were fed back to adjust the input parameters
4 Summary In summary, the 25Mg(p, γ)26Al reaction was directly measured at Jinping Underground Nuclear Astrophysics experimental facility (JUNA) in China Jinping Underground Laboratory (CJPL)

Summary

Introduction

The 1.809 MeV γ-ray emitted from the radioactive decay of 26Al in the interstellar medium of the Galaxy has been observed by several satellites [1,2,3]. Strieder et al [10] performed the first direct underground measurement of the 25Mg(p, γ)26Al reaction and obtained the 92 and 189 keV resonance strengths. The 189 keV resonance strength result of the underground experiment [10] is larger than those obtained by ground measurement [11] and accelerator mass spectrometer(AMS) method [12]. We performed a new direct measurement of the low energy resonances of 25Mg(p, γ)26Al at the 400 kV accelerator of Jinping Underground Nuclear Astrophysics experimental facility (JUNA) [13]. Since the result of the 92 keV resonance has already been published elsewhere [14], we present some supplementary results here

Experiment

Data analysis

Summary