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Title: Experimental study of Ar 38 + α reaction cross sections relevant to the Ca 41 abundance in the solar system [Experimental study of Ar 38 + α induced cross sections relevant to the Ca 41 abundance in the solar system]

Journal Article · · Physical Review C
 [1];  [2];  [3];  [1];  [1];  [4];  [5];  [1];  [1];  [6];  [2];  [1];  [7];  [5];  [8];  [9]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Clemson Univ., Clemson, SC (United States)
  3. Diakonie-Klinikum (Germany); Institute for Nuclear Research ATOMKI, Debrecen (Hungary)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); United States Naval Academy, Annapolis, MD (United States)
  5. Univ. of Maryland, College Park, MD (United States)
  6. Univ. of Connecticut, Storrs, CT (United States)
  7. Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Univ. of Illinois at Chicago, Chicago, IL (United States)
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In massive stars, the 41Ca(n,α)38Ar and 41K(p,α)38Ar reactions have been identified as the key reactions governing the abundance of 41Ca, which is considered as a potential chronometer for solar system formation. So far, due to experimental limitations, the 41Ca(n,α)38Ar reaction rate is solely based on statistical model calculations. In the present study, we have measured the time-inverse 38Ar(α,n)41Ca and 38Ar(α,p)41K reactions using an active target detector. The reactions were studied in inverse kinematics using a 133-MeV 38Ar beam and 4He as the active-gas target. Both excitation functions were measured simultaneously in the energy range of 6.8 ≤ Ec.m. ≤ 9.3 MeV. Furthermore by using detailed balance the 41Ca(n,α)38Ar and 41K(p,α)38Ar reaction rates were determined, which suggested a 20% increase in the 41Ca yield from massive stars.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; FG02-96ER40978
OSTI ID:
1461420
Alternate ID(s):
OSTI ID: 1436387
Journal Information:
Physical Review C, Vol. 97, Issue 5; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cross section of α -induced reactions on Au 197 at sub-Coulomb energies journal December 2019

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