γ spectroscopy of states in Cl32 relevant for the S31(p,γ)Cl32 reaction rate

Afanasieva, L.; Blackmon, J. C.; Deibel, C. M.; Lai, J.; Linhardt, L. E.; Rasco, B. C.; Seweryniak, D.; Alcorta, M.; Carpenter, M. P.; Clark, J. A.; Hoffman, C. R.; Janssens, R. V.  F.; Zhu, S.

doi:10.1103/PhysRevC.96.035801

Title: $γ$ spectroscopy of states in ${}^{32}{Cl}$ relevant for the ${}^{31}S (p, γ) {}^{32}{Cl}$ reaction rate

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.96.035801· OSTI ID:1392901

Afanasieva, L. ^[1]; Blackmon, J. C. ^[1]; Deibel, C. M. ^[1]; Lai, J. ^[1]; Linhardt, L. E. ^[1]; Rasco, B. C. ^[1]; Seweryniak, D. ^[2]; Alcorta, M. ^[2]; Carpenter, M. P. ^[2]; Clark, J. A. ^[2]; Hoffman, C. R. ^[2]; Janssens, R. V. F. ^[2]; Zhu, S. ^[2]

Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division

Background:The 31S(p,γ)32Cl reaction becomes important for sulfur production in novae if the 31P(p,α)28Si reaction rate is somewhat greater than currently accepted. The rate of the 31S(p,γ)32Cl reaction is uncertain,primarily due to the properties of resonances atEcm= 156 and 549 keV. Purpose:We precisely determined the excitation energies of states in 32Cl through high-resolutionγspectroscopy including the two states most important for the 31S(p,γ)32Cl reaction at nova temperatures. Method:Excited states in 32Cl were populated using the 10B(24Mg,2n)32Cl reaction with a 24Mg beam from the ATLAS facility at Argonne National Laboratory. The reaction channel of interest was selected using recoils inthe Fragment Mass Analyzer, and precise level energies were determined by detectingγrays with Gammasphere. Results:We observedγrays from the decay of 6 excited states in 32Cl. The excitation energies for two unbound levels at Ex= 1738.1 (6) keV and 2130.5 (10) keV were determined and found to be in agreement with a previous high-precision measurement of the 32S(3He,t)32Cl reaction [1]. Conclusions:An updated 31S(p,γ)32Cl reaction rate is presented. With the excitation energies of important levels firmly established, the dominant uncertainty in the reaction rate at nova temperatures is due to the strength of the resonance corresponding to the 2131-keV state in32Cl.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); University of North Carolina, Chapel Hill, NC (United States)

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

Grant/Contract Number:: AC02-06CH11357; FG02-96ER40978; FG02-97ER41033; FG02-97ER41041

OSTI ID:: 1392901

Alternate ID(s):: OSTI ID: 1378135; OSTI ID: 1658902; OSTI ID: 1658936

Journal Information:: Physical Review C, Vol. 96, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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