First measurement of ²⁵Al+p resonant scattering relevant to the astrophysical reaction ²²Mg(α,p)²⁵Al

¹ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
² School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
³ Center for Nuclear Study(CNS), University of Tokyo, RIKEN campus, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁴ National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
⁵ School of Physics and Astronomy, Monash University, Victoria 3800, Australia
⁶ OzGrav-Monash – Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC 3800, Australia
⁷ Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D), Australia
⁸ The Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA
⁹ Extreme Light Infrastructure -Nuclear Physics, IFIN-HH, 077125 Bucharest-M˘agurele, Romania
¹⁰ SUPA, School of Physics & Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
¹¹ Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
¹² College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
¹³ Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, Guangdong, China
¹⁴ Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
¹⁵ Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
¹⁶ Laboratori Nazionali del Sud-INFN, Via S. Sofia 62, Catania 95123, Italy
¹⁷ Dipartimento di Fisica e Astronomia “Ettore Majorana” -Università degli Studi di Catania
¹⁸ Centro Siciliano di Fisica Nucleare e Struttura della Materia (CSFNSM)
¹⁹ Facoltà di Ingegneria e Architettura, Università degli Studi di Enna “Kore”, Enna 94100, Italy
²⁰ Department of Physics & Astronomy, McMaster University, Ontario L8S 4M1, Canada
²¹ Département de Physique, Université Libre de Bruxelles, Bruxelles B-1050, Belgium
²² Department of Physics, Ewha Womans University, Seoul 03760, Korea
²³ RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

^* e-mail: hujunbaggio@impcas.ac.cn

Published online: 24 February 2022

Abstract

Type I X-ray bursts (XRBs) are the most frequently observed thermonuclear explosions in nature. The ²²Mg(α,p)²⁵Al reaction plays a critical role in XRB models. However, experimental information is insufficient to deduce a precise ²²Mg(α,p)²⁵Al reaction rate for the respective XRB temperature range. A new measurement of ²⁵Al+p resonant scattring was performed up to the astrophysically interested energy region of ²²Mg(α,p)²⁵Al. Several resonances were observed in the excitation functions, and their level properties have been determined based on an R-matrix analysis. In particular, proton widths and spin-parities of four natural-parity resonances above the α threshold of ²⁶Si, which can contribute the reaction rate of ²²Mg(α,p)²⁵Al, were first experimentally determined.