Radiative Capture on Nuclear Isomers: Direct Measurement of the ²⁶ᵐAl (p, γ) ²⁷Si Reaction

G. Lotay; A. Lennarz; C. Ruiz; C. Akers; A. A. Chen; G. Christian; D. Connolly; B. Davids; T. Davinson; J. Fallis; D. A. Hutcheon; P. Machule; L. Martin; J. D. Mountford; A St. J Murphy

doi:10.1103/PhysRevLett.128.042701

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Radiative Capture on Nuclear Isomers: Direct Measurement of the ²⁶ᵐAl (p, γ) ²⁷Si Reaction

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Radiative Capture on Nuclear Isomers: Direct Measurement of the ²⁶ᵐAl (p, γ) ²⁷Si Reaction

G. Lotay, A. Lennarz, C. Ruiz, C. Akers, A. A. Chen, G. Christian, D. Connolly, B. Davids, T. Davinson, J. Fallis, …

Physical Review Letters, Vol.128(4), pp.042701-1-042701-6

28/01/2022

DOI: https://doi.org/10.1103/PhysRevLett.128.042701

Abstract

Direct reactions

Nucleosynthesis in explosive environments

Radiative capture

Resonance reactions

Nuclear Astrophysics

We present the first direct measurement of an astrophysical reaction using a radioactive beam of isomeric nuclei. In particular, we have measured the strength of the key 447-keV resonance in the ²⁶ᵐAl (p, γ) ²⁷Si reaction to be 432 +146-226 meV and find that this resonance dominates the thermally averaged reaction rate for temperatures between 0.3 and 2.5 GK. This work represents a critical development in resolving one of the longest standing issues in nuclear astrophysics research, relating to the measurement of proton capture reactions on excited quantum levels, and offers unique insight into the destruction of isomeric ²⁶Al in astrophysical plasmas.

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Title: Radiative Capture on Nuclear Isomers: Direct Measurement of the ²⁶ᵐAl (p, γ) ²⁷Si Reaction
Creators: G. Lotay (Corresponding Author) - University of Surrey, School of Maths and Physics
A. Lennarz - TRIUMF
C. Ruiz - TRIUMF
C. Akers - TRIUMF
A. A. Chen - McMaster University
G. Christian - TRIUMF
D. Connolly - TRIUMF
B. Davids - TRIUMF
T. Davinson - University of Edinburgh
J. Fallis - TRIUMF
D. A. Hutcheon - TRIUMF
P. Machule - TRIUMF
L. Martin - TRIUMF
J. D. Mountford - University of Edinburgh
A St. J Murphy - University of Edinburgh
Publication Details: Physical Review Letters, Vol.128(4), pp.042701-1-042701-6
Publisher: American Physical Society
First online publication date: 27/01/2022
Publication Date: 28/01/2022
Date accepted for publication: 24/12/2021
Grants: Science and Technology Facilities Council (United Kingdom, Swindon) - STFC
Grant note: The authors are grateful to the ISAC operations team and the technical staff at TRIUMF for their support during the experiment. TRIUMF’s core operations are supported via a contribution from the federal government through the National Research Council of Canada, and the Government of British Columbia provides building capital funds. DRAGON is supported by funds from the National Sciences and Engineering Research Council of Canada Award No. SAPPJ-2019-00039. Authors from the Colorado School of Mines acknowledge support from the Department of Energy, Grant No. DE-FG02-93ER40789. The UK authors acknowledge support by Science and Technology Facilities Council (STFC).
Identifiers: 99634866402346; WOS:000759198300003
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Radiative Capture on Nuclear Isomers: Direct Measurement of the ²⁶ᵐAl (p, γ) ²⁷Si Reaction

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