γ -ray spectroscopy of astrophysically important states in Ca39

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/PhysRevC.101.015804

Title: $γ$ -ray spectroscopy of astrophysically important states in ${}^{39}{Ca}$

Journal Article · Wed Jan 29 00:00:00 EST 2020 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.101.015804· OSTI ID:1623266

^[1]; Bardayan, D. W. ^[2]; Baugher, T. ^[3]; Lepailleur, A. ^[3]; Pain, S. D. ^[4]; Ratkiewicz, A. ^[3]; Ahn, S. ^[5]; Allen, J. M. ^[2]; Anderson, J. T. ^[6]; Ayangeakaa, A. D. ^[6]; Blackmon, J. C. ^[7]; Burcher, S. ^[8]; Carpenter, M. P. ^[6]; Cha, S. M. ^[9]; Chae, K. Y. ^[9]; Chipps, K. A. ^[4]; Cizewski, J. A. ^[3]; Febbraro, M. ^[4]; Hall, O. ^[10]; Hu, J. ^[2] more »

Univ. of Notre Dame, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of 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 (Republic of Korea)
Univ. of Notre Dame, IN (United States); Univ. of Surrey, Guildford (United Kingdom)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Rutgers Univ., New Brunswick, NJ (United States); Univ. of Surrey, Guildford (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)
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Background: Nova explosions synthesize elements up to $A ≃ 40$ , and discrepancies exist between calculated and observed abundances of Ar and Ca created in the explosion. The ${}_{38}K (p, γ) {}_{39}{Ca}$ reaction rate has been illustrated to be influential on these isotopic abundances at the endpoint of nova nucleosynthesis. The energies of the three most important resonances, corresponding to $J^{π} = 5 / 2^{+}$ excited states in the ${}_{39}{Ca}$ nucleus above the proton separation threshold, are uncertain and one has been measured with conflicting values [ $E_{r} = 679 (2)$ versus $E_{r} = 701 (2)$ keV] in previous experiments. Purpose: Reducing the uncertainties on the resonance energies would allow for a better understanding of the reaction rate. To improve these uncertainties, we searched for $γ$ rays from the depopulation of the corresponding excited states in ${}_{39}{Ca}$ . Methods: We report a new measurement of these resonance energies via the observation of previously unobserved $γ$ -ray transitions. These transitions were observed by studying the ${}_{40}{Ca} (^{3} He, α γ) {}_{39}{Ca}$ reaction with Gammasphere ORRUBA Dual Detectors for Experimental Structure Studies (GODDESS). The updated resonance energies were then used to calculate the ${}_{38}K (p, γ) {}_{39}{Ca}$ reaction rate and assess its uncertainties. Results: In total, 23 new transitions were found, including three $γ$ -ray transitions corresponding to the three $J^{π} = 5 / 2^{+}$ states of astrophysical interest at energies of 6156.2(16), 6268.8(22), and 6470.8(19) keV. These correspond to resonance energies in the ${}_{38}K (p, γ) {}_{39}{Ca}$ reaction of 386(2), 498(2), and 701(2) keV. Conclusions: Updated ${}_{38}K (p, γ) {}_{39}{Ca}$ reaction rate calculations reflect a reduced upper limit at nova temperatures. However, the lower-than-previously-measured energy of the 498-keV resonance and uncertainty in its resonance strength increases the upper limit of the rate close to previous estimates at 0.4 GK.

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Research Organization:: Rutgers Univ., New Brunswick, NJ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); National Research Foundation of Korea (NRF)

Grant/Contract Number:: NA0003897; AC05-00OR22725; FG02-96ER40963; FG02-96ER40978; AC02-06CH11357; AC02-98CH10886

OSTI ID:: 1623266

Alternate ID(s):: OSTI ID: 1599769; OSTI ID: 1767880

Journal Information:: Physical Review C, Vol. 101, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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