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Title: Search for Nova Presolar Grains: $$γ$$-Ray Spectroscopy of 34Ar and its Relevance for the Astrophysical 33Cl($p,γ$) Reaction

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [3];  [4];  [2];  [1];  [5];  [6];  [1];  [7];  [2];  [8];  [1];  [9];  [2];  [2];  [2];  [7] more »;  [10];  [2];  [2];  [11];  [12] « less
  1. Univ. of Surrey, Guildford (United Kingdom)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Simon Fraser Univ., Burnaby, BC (Canada)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Jyvaskyla (Finland)
  5. Louisiana State Univ., Baton Rouge, LA (United States)
  6. Univ. of Surrey, Guildford (United Kingdom); Univ. of Warsaw (Poland)
  7. Univ. of Massachusetts, Lowell, MA (United States)
  8. Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
  9. Univ. Politècnica de Catalunya, Barcelona (Spain); Inst. d’Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
  10. Univ. of York (United Kingdom)
  11. Argonne National Lab. (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)
  12. 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 Cl 33 ( p , γ ) Ar 34 reaction is expected to play a decisive role. As such, we have performed a detailed γ -ray spectroscopy study of Ar 34 . Excitation energies have been measured with high precision and spin-parity assignments for resonant states, located above the proton threshold in Ar 34 , have been made for the first time. Uncertainties in the Cl 33 ( p , γ ) reaction have been dramatically reduced and the results indicate that a newly identified = 0 resonance at E r = 396.9 ( 13 ) keV dominates the entire rate for T = 0.25 0.40 GK . Furthermore, nova hydrodynamic simulations based on the present work indicate an ejected S 32 / S 33 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
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (30)

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