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PreprintarXiv licencearXiv

Direct measurement of the 23Mg(p, γ)24Al reaction using the DRAGON recoil separator and a hybrid array of γ-ray detectors

  • A. C. Edwin
  • G. Christian
  • A. Lennarz
  • I. Casandjian
  • S. M. Collins
  • E. Desmarais
  • U. Greife
  • D. A. Hutcheon
  • A. Katrusiak
  • M. Loria
  • S. Moll{ó}
  • J. O'Connell
10 more authors
  • S. Pascu
  • L. Pedro-Botet
  • Zs. Podoly{á}k
  • B. J. Reed
  • P. H. Regan
  • C. Ruiz
  • R. Shearman
  • S. Upadhyayula
  • L. Wagner
  • M. Williams
Open at sourcePDFDOICite

Abstract

Background: The 23Mg(p,γ)24Al reaction plays a key role in nova nucleosynthesis, serving as a bridge between the Ne-Na and Mg-Al cycles and impacting synthesis of a wide variety of nuclides. It is crucial that the rate of this reaction be well constrained by experimental data, in particular the properties of the key resonance at Ecm≈480 keV, which dominates the rate at nova temperatures. Purpose: Our study aims to improve experimental constraints on the energy and strength of the key Ecm≈480 keV 23Mg(p,γ)24Al resonance through a new direct measurement of its strength and energy. Methods: We used a 23Mg radioactive beam to directly observe capture into the Ecm≈480 keV resonance in inverse kinematics. The 24Al recoils were selected by the DRAGON recoil separator, and coincident γ rays were measured in a hybrid LaBr3/CeBr3/BGO scintillator array. The 24Al singles yield was used to determine the resonance strength, while the time difference between the coincident γ rays and the incident beam was used to determine the resonance energy. Results: We obtained a strength of ωγ=38(7) meV and an energy of Ecm=478.8(26) keV for the key astrophysical 23Mg(p,γ)24Al resonance. Conclusions: Our reported strength is in excellent agreement with the previously reported direct measurement, as well as shell model calculations. Our energy is in good agreement with earlier indirect measurements. Reaction rate calculations incorporating our results indicate that the 23Mg(p,γ)24Al rate is constrained to a 1σ up/down factor of 1.5 or smaller in the nova temperature range of 0.2--0.4 GK.

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Cite

BibTeXRIS
BibTeX
@misc{edwin2026direct,
  title = {{Direct measurement of the $^23\mathrmMg(p, γ)^24\mathrmAl$ reaction using the DRAGON recoil separator and a hybrid array of $γ$-ray detectors}},
  author = {A. C. Edwin and G. Christian and A. Lennarz and I. Casandjian and S. M. Collins and E. Desmarais and U. Greife and D. A. Hutcheon and A. Katrusiak and M. Loria and S. Molló and J. O'Connell and S. Pascu and L. Pedro-Botet and Zs. Podolyák and B. J. Reed and P. H. Regan and C. Ruiz and R. Shearman and S. Upadhyayula and L. Wagner and M. Williams},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.35860},
  eprint = {2610.35860},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.35860},
}
RIS
TY  - UNPB
TI  - Direct measurement of the ^23Mg(p, γ)^24Al reaction using the DRAGON recoil separator and a hybrid array of γ-ray detectors
AU  - A. C. Edwin
AU  - G. Christian
AU  - A. Lennarz
AU  - I. Casandjian
AU  - S. M. Collins
AU  - E. Desmarais
AU  - U. Greife
AU  - D. A. Hutcheon
AU  - A. Katrusiak
AU  - M. Loria
AU  - S. Moll{ó}
AU  - J. O'Connell
AU  - S. Pascu
AU  - L. Pedro-Botet
AU  - Zs. Podoly{á}k
AU  - B. J. Reed
AU  - P. H. Regan
AU  - C. Ruiz
AU  - R. Shearman
AU  - S. Upadhyayula
AU  - L. Wagner
AU  - M. Williams
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.35860
UR  - https://arxiv.org/abs/2610.35860
AB  - Background: The ^23Mg(p,γ)^24Al reaction plays a key role in nova nucleosynthesis, serving as a bridge between the Ne-Na and Mg-Al cycles and impacting synthesis of a wide variety of nuclides. It is crucial that the rate of this reaction be well constrained by experimental data, in particular the properties of the key resonance at E_cm≈480 keV, which dominates the rate at nova temperatures. Purpose: Our study aims to improve experimental constraints on the energy and strength of the key E_cm≈480 keV ^23Mg(p,γ)^24Al resonance through a new direct measurement of its strength and energy. Methods: We used a ^23Mg radioactive beam to directly observe capture into the E_cm≈480 keV resonance in inverse kinematics. The ^24Al recoils were selected by the DRAGON recoil separator, and coincident γ rays were measured in a hybrid LaBr_3/CeBr_3/BGO scintillator array. The ^24Al singles yield was used to determine the resonance strength, while the time difference between the coincident γ rays and the incident beam was used to determine the resonance energy. Results: We obtained a strength of ωγ=38(7) meV and an energy of E_cm=478.8(26) keV for the key astrophysical ^23Mg(p,γ)^24Al resonance. Conclusions: Our reported strength is in excellent agreement with the previously reported direct measurement, as well as shell model calculations. Our energy is in good agreement with earlier indirect measurements. Reaction rate calculations incorporating our results indicate that the ^23Mg(p,γ)^24Al rate is constrained to a 1σ up/down factor of 1.5 or smaller in the nova temperature range of 0.2--0.4 GK.
ER  -