Low-energy Al 23 β -delayed proton decay and Na 22 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; P. Tiwari

doi:10.1103/PhysRevC.101.052802

Low-energy Al 23 β -delayed proton decay and Na 22 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, P. Tiwari

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10 Scopus citations

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.

Original language	English
Article number	052802
Journal	Physical Review C
Volume	101
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.101.052802
State	Published - May 2020
Externally published	Yes

Funding

We gratefully acknowledge the NSCL staff for collaborating on the mechanical design and fabrication of GADGET, technical assistance, and for providing the Al23 beam. We thank the NSCL γ group for assistance with SeGA. This work was supported by the U.S. National Science Foundation under Grants No. PHY-1102511, No. PHY-1565546, and No. PHY-1913554, and the U.S. Department of Energy, Office of Science, under Award No. DE-SC0016052. We also acknowledge support by the Spanish MINECO Grant No. AYA2017-86274-P by the E.U. FEDER funds and by the AGAUR/Generalitat de Catalunya Grant No. SGR-661/2017. This Rapid Communication benefited from discussions within the ChETEC' COST Action (Grant No. CA16117). We gratefully acknowledge the NSCL staff for collaborating on the mechanical design and fabrication of GADGET, technical assistance, and for providing the beam. We thank the NSCL group for assistance with SeGA. This work was supported by the U.S. National Science Foundation under Grants No. PHY-1102511, No. PHY-1565546, and No. PHY-1913554, and the U.S. Department of Energy, Office of Science, under Award No. DE-SC0016052. We also acknowledge support by the Spanish MINECO Grant No. AYA2017-86274-P by the E.U. FEDER funds and by the AGAUR/Generalitat de Catalunya Grant No. SGR-661/2017. This Rapid Communication benefited from discussions within the ChETEC' COST Action (Grant No. CA16117).

Funders	Funder number
NSCL
National Science Foundation	PHY-1913554, PHY-1565546, PHY-1102511
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1102511
Office of Science	DE-SC0016052
Generalitat de Catalunya	CA16117, SGR-661/2017
Agència de Gestió d'Ajuts Universitaris i de Recerca
Ministerio de Economía y Competitividad	AYA2017-86274-P
European Regional Development Fund

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10.1103/PhysRevC.101.052802

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Friedman, M., Budner, T., Pérez-Loureiro, D., Pollacco, E., Wrede, C., José, J., Brown, B. A., Cortesi, M., Fry, C., Glassman, B., Heideman, J., Janasik, M., Roosa, M., Stomps, J., Surbrook, J., & Tiwari, P. (2020). Low-energy Al 23 β -delayed proton decay and Na 22 destruction in novae. Physical Review C, 101(5), Article 052802. https://doi.org/10.1103/PhysRevC.101.052802

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title = "Low-energy Al 23 β -delayed proton decay and Na 22 destruction in novae",

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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AU - Friedman, M.

AU - Budner, T.

AU - Pérez-Loureiro, D.

AU - Pollacco, E.

AU - Wrede, C.

AU - José, J.

AU - Brown, B. A.

AU - Cortesi, M.

AU - Fry, C.

AU - Glassman, B.

AU - Heideman, J.

AU - Janasik, M.

AU - Roosa, M.

AU - Stomps, J.

AU - Surbrook, J.

AU - Tiwari, P.

PY - 2020/5

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N2 - 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.

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

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