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Low-energy 23Al β-delayed proton decay and 22Na destruction in novae

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [2];  [5];  [2];  [2];  [2];  [2];  [6];  [2];  [2];  [2];  [2];  [2]
  1. Michigan State Univ., East Lansing, MI (United States); Hebrew Univ. of Jerusalem (Israel)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Michigan State Univ., East Lansing, MI (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. Univ. Politecnica de Catalunya, Barcelona (Spain); Inst. d'Estudis Espacials de Catalunya, Barcelona (Spain)
  6. Univ. of Tennessee, Knoxville, TN (United States)
+ Show Author Affiliations
The radionuclide 22Na is a target of γ-ray astronomy searches, predicted to be produced during thermonuclear runaways driving classical novae. The 22Na (p, γ) 23Mg reaction is the main destruction channel of 22Na during a nova, hence, its rate is needed to accurately predict the 22Na 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 23Al β-delayed protons as a probe of the key 204-keV (center-of-mass) 22Na (p, γ) 23Mg resonance strength. We report a factor of 5 lower branching ratio compared to the most recent literature value. The variation in 22Na 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. Finally, this is the first reported scientific measurement using the Gaseous Detector with Germanium Tagging system.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
MINECO; National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1726146
Report Number(s):
LA-UR--20-24094
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 101; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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nucleon induced nuclear reactions
proton emission
resonance reactions