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Cross sections of α -induced reactions slightly below doubly magic Ca40 from the statistical model

Journal Article · · Physical Review C
 [1];  [2];  [2]
  1. Germany and Inst. for Nuclear Research (Atomki), Debrecen (Hungary)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
+ Show Author Affiliations
New experimental data for the 38Ar (α , n) 41Ca and 38Ar (α, p) 41K reactions were used to find a best-fit set of parameters for statistical model calculations. The very good agreement between the experimental data and the best-fit calculation confirms the applicability of the statistical model for nuclei in the vicinity of the doubly magic 40Ca despite their relatively low level densities. The present study investigates the sensitivities and finds that the α -nucleus and the nucleon-nucleus potentials are the most important ingredients for the calculation of (α, n) and (α, p) reactions in the statistical model. Furthermore, the width fluctuation correction plays an essential role in the peculiar case of 38Ar. The best-fit parameters from 38Ar are applied to the mirror nucleus 38Ca and the neighboring 36Ar and 40Ar nuclei. For 38Ca this results in an astrophysical reaction rate of the 38 Ca (α , p) 41Sc reaction, which has a flatter temperature dependence compared to all previous calculations. For 40Ar a better reproduction of 40Ar (α , p) 43K data from literature is obtained. The disagreement between calculation and an early experimental data point for the 36Ar (α, p) 39K reaction persists.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Research Development and Innovation Office of Hungary (NKFIH); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1490333
Alternate ID(s):
OSTI ID: 1479138
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 98; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Cross section of α -induced reactions on Au 197 at sub-Coulomb energies journal December 2019
Cross-sections at sub-Coulomb energies: Full optical model versus barrier transmission for 40Ca + α journal May 2019

Figures / Tables (11)

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TABLE I(p. 7)table TABLE I
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