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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]

Abstract

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 ≤ E c.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.

Authors:
 [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)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1461420
Alternate Identifier(s):
OSTI ID: 1436387
Grant/Contract Number:  
[AC02-06CH11357; FG02-96ER40978]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
[ Journal Volume: 97; Journal Issue: 5]; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Talwar, R., Bojazi, M. J., Mohr, P., Auranen, K., Avila, M. L., Ayangeakaa, A. D., Harker, J., Hoffman, C. R., Jiang, C. L., Kuvin, S. A., Meyer, B. S., Rehm, K. E., Santiago-Gonzalez, D., Sethi, J., Ugalde, C., and Winkelbauer, J. R. Experimental study of Ar38+α reaction cross sections relevant to the Ca41 abundance in the solar system [Experimental study of Ar38+α induced cross sections relevant to the Ca41 abundance in the solar system]. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.055801.
Talwar, R., Bojazi, M. J., Mohr, P., Auranen, K., Avila, M. L., Ayangeakaa, A. D., Harker, J., Hoffman, C. R., Jiang, C. L., Kuvin, S. A., Meyer, B. S., Rehm, K. E., Santiago-Gonzalez, D., Sethi, J., Ugalde, C., & Winkelbauer, J. R. Experimental study of Ar38+α reaction cross sections relevant to the Ca41 abundance in the solar system [Experimental study of Ar38+α induced cross sections relevant to the Ca41 abundance in the solar system]. United States. doi:10.1103/PhysRevC.97.055801.
Talwar, R., Bojazi, M. J., Mohr, P., Auranen, K., Avila, M. L., Ayangeakaa, A. D., Harker, J., Hoffman, C. R., Jiang, C. L., Kuvin, S. A., Meyer, B. S., Rehm, K. E., Santiago-Gonzalez, D., Sethi, J., Ugalde, C., and Winkelbauer, J. R. Tue . "Experimental study of Ar38+α reaction cross sections relevant to the Ca41 abundance in the solar system [Experimental study of Ar38+α induced cross sections relevant to the Ca41 abundance in the solar system]". United States. doi:10.1103/PhysRevC.97.055801. https://www.osti.gov/servlets/purl/1461420.
@article{osti_1461420,
title = {Experimental study of Ar38+α reaction cross sections relevant to the Ca41 abundance in the solar system [Experimental study of Ar38+α induced cross sections relevant to the Ca41 abundance in the solar system]},
author = {Talwar, R. and Bojazi, M. J. and Mohr, P. and Auranen, K. and Avila, M. L. and Ayangeakaa, A. D. and Harker, J. and Hoffman, C. R. and Jiang, C. L. and Kuvin, S. A. and Meyer, B. S. and Rehm, K. E. and Santiago-Gonzalez, D. and Sethi, J. and Ugalde, C. and Winkelbauer, J. R.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.97.055801},
journal = {Physical Review C},
number = [5],
volume = [97],
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

FIG. 1 FIG. 1: Schematic of the asyymetric segmentation of the anode strips 1-16 inside the MUSIC detector. The black line shows the 38Ar beam going through the center of the detector and the red and blue lines (solid and dashed, respectively) show the outgoing reaction particles for a reaction occuring inmore » strip 5.« less

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