Excited states of Ca39 and their significance in nova nucleosynthesis

Setoodehnia, K.; Marshall, C.; Kelley, J. H.; Liang, J.; Portillo Chaves, F.; Longland, R.

doi:10.1103/PhysRevC.98.055804

Title: Excited states of ${}^{39}{Ca}$ and their significance in nova nucleosynthesis

Journal Article · Mon Nov 26 00:00:00 EST 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.055804· OSTI ID:1483394

Setoodehnia, K. ^[1]; Marshall, C. ^[1]; Kelley, J. H. ^[1]; Liang, J. ^[2]; Portillo Chaves, F. ^[1]; Longland, R. ^[1]

North Carolina State Univ., Raleigh, NC (United States). Department of Physics; Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
McMaster Univ., Hamilton, ON (Canada). Department of Physics & Astronomy

Background: We report that discrepancies exist between the observed abundances of argon and calcium in oxygen-neon nova ejecta and those predicted by nova models. An improved characterization of the ³⁸K(p,γ) ³⁹Ca reaction rate over the nova temperature regime (~ 0.1-0.4 GK), and thus the nuclear structure of ³⁹Ca above the proton threshold (5770.92(63) keV), is necessary to resolve these contradictions. Purpose: The present study was performed to search for low-spin proton resonances in the ³⁸K + p system, and to improve the uncertainties in energies of the known astrophysically significant proton resonances in ³⁹Ca. Methods: The level structure of ³⁹Ca was investigated via high-resolution charged-particle spectroscopy with an Enge split-pole spectrograph using the ⁴⁰Ca(³He, α) ³⁹Ca reaction. Differential cross sections were measured over 6 laboratory angles at 21 MeV. Distorted-wave Born approximation calculations were performed to constrain the spin-parity assignments of observed levels with special attention to those significant in determination of the ³⁸K(p,γ) ³⁹Ca reaction rate over the nova temperature regime. Results: The resonance energies corresponding to two out of three astrophysically important states at 6154(5) and 6472.2(24) keV are measured with better precision than previous charged-particle spectroscopy measurements. A tentatively new state is discovered at 5908(3) keV. The spin-parity assignments of a few of the astrophysically important resonances are determined. Conclusions: Lastly, the present ³⁸K(p,γ) ³⁹Ca upper limit thermonuclear reaction rate at 0.1-0.4 GK is higher than that determined in [Physical Review C 97 (2018) 025802] by at most a factor of 1.4 at 0.1 GK.

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Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0017799; FG02-97ER41041

OSTI ID:: 1483394

Alternate ID(s):: OSTI ID: 1492152

Journal Information:: Physical Review C, Vol. 98, Issue 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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