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Direct Measurement of the Astrophysical 38Kðp;γÞ39Ca Reaction and Its Influence on theproduction of Nuclides toward the End Point of Nova Nucleosynthesis

Lotay, GJ, Christian, G, Ruiz, C, Akers, C, Burke, DS, Catford, WN, Chen, AA, Connolly, D, Davids, B, Fallis, J, Hager, U, Hutcheon, DA, Mahl, A, Rojas, A and Sun, X (2016) Direct Measurement of the Astrophysical 38Kðp;γÞ39Ca Reaction and Its Influence on theproduction of Nuclides toward the End Point of Nova Nucleosynthesis Physical Review Letters, 116 (13).

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Abstract

We have performed the first direct measurement of the 38Kðp; γÞ39Ca reaction using a beam of radioactive 38K. A proposed l ¼ 0 resonance in the 38K þ p system has been identified at 679(2) keV with an associated strength of 120 þ50 −30 meV. Upper limits of 1.16 (3.5) and 8.6 (26) meV at the 68% (95%) confidence level were also established for two further expected l ¼ 0 resonances at 386 and 515 keV, respectively. The present results have reduced uncertainties in the 38Kðp; γÞ39Ca reaction rate at temperatures of 0.4 GK by more than 2 orders of magnitude and indicate that Ar and Ca may be ejected in observable quantities by oxygen-neon novae. However, based on the newly evaluated rate, the 38Kðp; γÞ39Ca path is unlikely to be responsible for the production of Ar and Ca in significantly enhanced quantities relative to solar abundances.

Item Type: Article
Subjects : subj_Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Lotay, GJUNSPECIFIEDUNSPECIFIED
Christian, GUNSPECIFIEDUNSPECIFIED
Ruiz, CUNSPECIFIEDUNSPECIFIED
Akers, CUNSPECIFIEDUNSPECIFIED
Burke, DSUNSPECIFIEDUNSPECIFIED
Catford, WNUNSPECIFIEDUNSPECIFIED
Chen, AAUNSPECIFIEDUNSPECIFIED
Connolly, DUNSPECIFIEDUNSPECIFIED
Davids, BUNSPECIFIEDUNSPECIFIED
Fallis, JUNSPECIFIEDUNSPECIFIED
Hager, UUNSPECIFIEDUNSPECIFIED
Hutcheon, DAUNSPECIFIEDUNSPECIFIED
Mahl, AUNSPECIFIEDUNSPECIFIED
Rojas, AUNSPECIFIEDUNSPECIFIED
Sun, XUNSPECIFIEDUNSPECIFIED
Date : 1 April 2016
Identification Number : 10.1103/PhysRevLett.116.132701
Copyright Disclaimer : © 2016 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 22 Apr 2016 11:10
Last Modified : 22 Apr 2016 11:10
URI: http://epubs.surrey.ac.uk/id/eprint/810516

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