Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New ^{22}Mg(α,p)^{25}Al Reaction Rate Determined at the Gamow Energy

J Hu; H Yamaguchi; Y H Lam; A Heger; D Kahl; A M Jacobs; Z Johnston; S W Xu; N T Zhang; S B Ma; L H Ru; E Q Liu; T Liu; S Hayakawa; L Yang; H Shimizu; C B Hamill; A St J Murphy; J Su; X Fang; K Y Chae; M S Kwag; S M Cha; N N Duy; N K Uyen; D H Kim; R G Pizzone; M La Cognata; S Cherubini; S Romano; A Tumino; J Liang; A Psaltis; M Sferrazza; D Kim; Y Y Li; S Kubono

doi:10.1103/PhysRevLett.127.172701

Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New ^{22}Mg(α,p)^{25}Al Reaction Rate Determined at the Gamow Energy

Phys Rev Lett. 2021 Oct 22;127(17):172701. doi: 10.1103/PhysRevLett.127.172701.

Authors

J Hu^{1

2}, H Yamaguchi^{3

4}, Y H Lam^{1

2}, A Heger^{5

6

7

8}, D Kahl^{9

10}, A M Jacobs^{8

11}, Z Johnston^{8

11}, S W Xu¹, N T Zhang¹, S B Ma¹, L H Ru¹, E Q Liu¹, T Liu¹, S Hayakawa³, L Yang³, H Shimizu³, C B Hamill¹⁰, A St J Murphy¹⁰, J Su¹², X Fang¹³, K Y Chae¹⁴, M S Kwag¹⁴, S M Cha¹⁴, N N Duy^{14

15}, N K Uyen¹⁴, D H Kim¹⁴, R G Pizzone¹⁶, M La Cognata¹⁶, S Cherubini¹⁶, S Romano^{16

17

18}, A Tumino^{16

19}, J Liang²⁰, A Psaltis²⁰, M Sferrazza²¹, D Kim²², Y Y Li^{1

2}, S Kubono^{3

23}

Affiliations

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), the 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, Michigan 48824, USA.
⁹ Extreme Light Infrastructure - Nuclear Physics, IFIN-HH, 077125 Bucharest-Măgurele, 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, Michigan 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, Via. Sofia, 64 95123 Catania, Italy.
¹⁸ Centro Siciliano di Fisica Nucleare e Struttura della Materia (CSFNSM), Via. Sofia, 64 95123 Catania, Italy.
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.

PMID: 34739292
DOI: 10.1103/PhysRevLett.127.172701

Abstract

We report the first (in)elastic scattering measurement of ^{25}Al+p with the capability to select and measure in a broad energy range the proton resonances in ^{26}Si contributing to the ^{22}Mg(α,p) reaction at type I x-ray burst energies. We measured spin-parities of four resonances above the α threshold of ^{26}Si that are found to strongly impact the ^{22}Mg(α,p) rate. The new rate advances a state-of-the-art model to remarkably reproduce light curves of the GS 1826-24 clocked burster with mean deviation <9% and permits us to discover a strong correlation between the He abundance in the accreting envelope of the photospheric radius expansion burster and the dominance of ^{22}Mg(α,p) branch.