• Rapid Communication

Low-energy Al23β-delayed proton decay and Na22 destruction in novae

M. Friedman, T. Budner, D. Pérez-Loureiro, E. Pollacco, C. Wrede, J. José, B. A. Brown, M. Cortesi, C. Fry, B. Glassman, J. Heideman, M. Janasik, M. Roosa, J. Stomps, J. Surbrook, and P. Tiwari
Phys. Rev. C 101, 052802(R) – Published 19 May 2020

Abstract

The radionuclide Na22 is a target of γ-ray astronomy searches, predicted to be produced during thermonuclear runaways driving classical novae. The Na22(p,γ)Mg23 reaction is the main destruction channel of Na22 during a nova, hence, its rate is needed to accurately predict the Na22 yield. However, experimental determinations of the resonance strengths have led to inconsistent results. In this Rapid Communication, we report a measurement of the branching ratios of the Al23β-delayed protons as a probe of the key 204-keV (center-of-mass) Na22(p,γ)Mg23 resonance strength. We report a factor of 5 lower branching ratio compared to the most recent literature value. The variation in Na22 yield due to nuclear data inconsistencies was assessed using a series of hydrodynamic nova outburst simulations and has increased to a factor of 3.8, corresponding to a factor of 2 uncertainty in the maximum detectability distance. This is the first reported scientific measurement using the Gaseous Detector with Germanium Tagging system.

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  • Received 21 November 2019
  • Revised 12 February 2020
  • Accepted 23 March 2020

DOI:https://doi.org/10.1103/PhysRevC.101.052802

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

M. Friedman1,2,*, T. Budner1,3, D. Pérez-Loureiro1,4, E. Pollacco5, C. Wrede1,3,†, J. José6,7, B. A. Brown1,3, M. Cortesi1, C. Fry1,3, B. Glassman1,3, J. Heideman4, M. Janasik1,3, M. Roosa1,3, J. Stomps1,3, J. Surbrook1,3, and P. Tiwari1,3

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Racah Institute of Physics, Hebrew University, Jerusalem, Israel 91904
  • 3Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 5IRFU, CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France
  • 6Departament de Física, Escola d'Enginyeria de Barcelona Est, Universitat Politècnica de Catalunya, Avenida/Eduard Maristany 10, E-08930 Barcelona, Spain
  • 7Institut d'Estudis Espacials de Catalunya, Edifici Nexus-201, C/Gran Capità 2-4, E-08034 Barcelona, Spain

  • *moshe.friedman@mail.huji.ac.il
  • wrede@nscl.msu.edu

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Issue

Vol. 101, Iss. 5 — May 2020

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