Isospin mixing reveals 30P(p, γ)31S resonance influencing nova nucleosynthesis

Bennett, M. B.; Wrede, C.; Brown, B. A.; Liddick, S. N.; Perez-Loureiro, D.; Bardayan, D. W.; Chen, A. A.; Chipps, K. A.; Fry, C.; Glassman, B. E.; Langer, C.; Larson, N. R.; McNeice, E. I.; Meisel, Z.; Ong, W.; O'Malley, P. D.; Pain, S. D.; Prokop, C. J.; Schatz, H.; Schwartz, S. B.; Suchyta, S.; Thompson, P.; Walters, M.; Xu, X.

doi:10.1103/PhysRevLett.116.102502

Title: Isospin mixing reveals ³⁰P(p, γ)³¹S resonance influencing nova nucleosynthesis

Journal Article · Tue Mar 08 00:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.102502· OSTI ID:1261528

Bennett, M. B. ^[1]; Wrede, C. ^[1]; Brown, B. A. ^[1]; Liddick, S. N. ^[1]; Perez-Loureiro, D. ^[1]; Bardayan, D. W. ^[2]; Chen, A. A. ^[3]; Chipps, K. A. ^[4]; Fry, C. ^[1]; Glassman, B. E. ^[1]; Langer, C. ^[1]; Larson, N. R. ^[1]; McNeice, E. I. ^[3]; Meisel, Z. ^[5]; Ong, W. ^[1]; O'Malley, P. D. ^[2]; Pain, S. D. ^[6]; Prokop, C. J. ^[1]; Schatz, H. ^[1]; Schwartz, S. B. ^[7] more »

Michigan State Univ., East Lansing, MI (United States)
Univ. of Notre Dame, Notre Dame, IN (United States)
McMaster Univ., Hamilton, ON (Canada)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Southern Indiana, Evansville, IN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Here, the thermonuclear ³⁰P(p, γ)³¹S reaction rate is critical for modeling the final elemental and isotopic abundances of ONe nova nucleosynthesis, which affect the calibration of proposed nova thermometers and the identification of presolar nova grains, respectively. Unfortunately, the rate of this reaction is essentially unconstrained experimentally, because the strengths of key ³¹S proton capture resonance states are not known, largely due to uncertainties in their spins and parities. Using the β decay of ³¹Cl, we have observed the β-delayed γ decay of a ³¹S state at E_x = 6390.2(7) keV, with a ³⁰P(p, γ)³¹S resonance energy of E_r = 259.3(8) keV, in the middle of the ³⁰P(p, γ)³¹S Gamow window for peak nova temperatures. This state exhibits isospin mixing with the nearby isobaric analog state at E_x = 6279.0(6) keV, giving it an unambiguous spin and parity of 3/2⁺ and making it an important l = 0 resonance for proton capture on ³⁰P.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; NA0000979

OSTI ID:: 1261528

Alternate ID(s):: OSTI ID: 1240763

Journal Information:: Physical Review Letters, Vol. 116, Issue 10; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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