Search for Nova Presolar Grains: $$γ$$-Ray Spectroscopy of 34Ar and its Relevance for the Astrophysical 33Cl($p,γ$) Reaction
- Univ. of Surrey, Guildford (United Kingdom)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Simon Fraser Univ., Burnaby, BC (Canada)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Jyvaskyla (Finland)
- Louisiana State Univ., Baton Rouge, LA (United States)
- Univ. of Surrey, Guildford (United Kingdom); Univ. of Warsaw (Poland)
- Univ. of Massachusetts, Lowell, MA (United States)
- Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
- Univ. Politècnica de Catalunya, Barcelona (Spain); Inst. d’Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
- Univ. of York (United Kingdom)
- Argonne National Lab. (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
The discovery of presolar grains in primitive meteorites has launched a new era of research in the study of stellar nucleosynthesis. However, the accurate classification of presolar grains as being of specific stellar origins is particularly challenging. Recently, it has been suggested that sulfur isotopic abundances may hold the key to definitively identifying presolar grains with being of nova origins and, in this regard, the astrophysical reaction is expected to play a decisive role. As such, we have performed a detailed -ray spectroscopy study of . Excitation energies have been measured with high precision and spin-parity assignments for resonant states, located above the proton threshold in , have been made for the first time. Uncertainties in the reaction have been dramatically reduced and the results indicate that a newly identified resonance at dominates the entire rate for . Furthermore, nova hydrodynamic simulations based on the present work indicate an ejected abundance ratio distinctive from type-II supernovae and potentially compatible with recent measurements of a presolar grain.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Tandem Linac Accelerator System (ATLAS); University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Organization:
- Science and Technology Facilities Council (STFC); Natural Sciences and Engineering Research Council of Canada (NSERC); Spanish Ministerio de Economia y Competitividad (MINECO); European Union (EU); USDOE Office of Science (SC), Nuclear Physics (NP); AGAUR/Generalitat de Catalunya
- Grant/Contract Number:
- AC02-06CH11357; FG02-94ER40834; FG02-97ER41041; FG02-97ER41033; FG02-94ER40848; SC0014231; AYA2017-86274-P; SGR-661/2017
- OSTI ID:
- 1867077
- Alternate ID(s):
- OSTI ID: 1639447; OSTI ID: 1659276; OSTI ID: 1659278
- Journal Information:
- Physical Review Letters, Vol. 124, Issue 25; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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