Key Ne19 States Identified Affecting γ-Ray Emission from F18 in Novae

Hall, M. R.; Bardayan, D. W.; Baugher, T.; Lepailleur, A.; Pain, S. D.; Ratkiewicz, A.; Ahn, S.; Allen, J. M.; Anderson, J. T.; Ayangeakaa, A. D.; Blackmon, J. C.; Burcher, S.; Carpenter, M. P.; Cha, S. M.; Chae, K. Y.; Chipps, K. A.; Cizewski, J. A.; Febbraro, M.; Hall, O.; Hu, J.; Jiang, C. L.; Jones, K. L.; Lee, E. J.; O’Malley, P. D.; Ota, S.; Rasco, B. C.; Santiago-Gonzalez, D.; Seweryniak, D.; Sims, H.; Smith, K.; Tan, W. P.; Thompson, P.; Thornsberry, C.; Varner, R. L.; Walter, D.; Wilson, G. L.; Zhu, S.

doi:10.1103/PhysRevLett.122.052701

Title: Key ${}^{19}{Ne}$ States Identified Affecting $γ$ -Ray Emission from ${}^{18}F$ in Novae

Journal Article · 06 February 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.122.052701 · OSTI ID:1495378

Hall, M. R. ^[1]; Bardayan, D. W. ^[1]; Baugher, T. ^[2]; Lepailleur, A. ^[2]; Pain, S. D. ^[3]; Ratkiewicz, A. ^[2]; Ahn, S. ^[4]; Allen, J. M. ^[1]; Anderson, J. T. ^[5]; Ayangeakaa, A. D. ^[5]; Blackmon, J. C. ^[6]; Burcher, S. ^[7]; Carpenter, M. P. ^[5]; Cha, S. M. ^[8]; Chae, K. Y. ^[8]; Chipps, K. A. ^[3]; Cizewski, J. A. ^[2]; Febbraro, M. ^[3]; Hall, O. ^[9]; Hu, J. ^[1] more »

Univ. of Notre Dame, Notre Dame, IN (United States)
Rutgers Univ., New Brunswick, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Sungkyunkwan Univ., Suwon (South Korea)
Univ. of Notre Dame, Notre Dame, IN (United States); Univ. of Surrey, Surrey (United Kingdom)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Rutgers Univ., New Brunswick, NJ (United States); Univ. of Surrey, Surrey (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Louisiana State Univ., Baton Rouge, LA (United States); Univ. of Massachusetts, Lowell, MA (United States)

Detection of nuclear-decay γ rays provides a sensitive thermometer of nova nucleosynthesis. The most intense γ-ray flux is thought to be annihilation radiation from the β⁺ decay of ¹⁸F, which is destroyed prior to decay by the ¹⁸F(p,α)¹⁵O reaction. Estimates of ¹⁸F production had been uncertain, however, because key near-threshold levels in the compound nucleus, ¹⁹Ne, had yet to be identified. We report the first measurement of the ¹⁹F(³He,tγ)¹⁹Ne reaction, in which the placement of two long-sought 3/2⁺ levels is suggested via triton-γ–γ coincidences. Furthermore, the precise determination of their resonance energies reduces the upper limit of the rate by a factor of 1.5–17 at nova temperatures and reduces the average uncertainty on the nova detection probability by a factor of 2.1.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rutgers Univ., New Brunswick, NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; FG02-96ER40963; FG02-96ER40978; NA0002132

OSTI ID:: 1495378

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 122; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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