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]

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.

doi:10.1103/PhysRevC.97.055801

Experimental study of ${}^{38}{Ar} + α$ reaction cross sections relevant to the ${}^{41}{Ca}$ abundance in the solar system [Experimental study of ${}^{38}{Ar} + α$ induced cross sections relevant to the ${}^{41}{Ca}$ abundance in the solar system]

Journal Article · Tue May 08 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.055801· OSTI ID:1461420

Talwar, R. ^[1]; Bojazi, M. J. ^[2]; Mohr, P. ^[3]; Auranen, K. ^[1]; Avila, M. L. ^[1]; Ayangeakaa, A. D. ^[4]; Harker, J. ^[5]; Hoffman, C. R. ^[1]; Jiang, C. L. ^[1]; Kuvin, S. A. ^[6]; Meyer, B. S. ^[2]; Rehm, K. E. ^[1]; Santiago-Gonzalez, D. ^[7]; Sethi, J. ^[5]; Ugalde, C. ^[8]; Winkelbauer, J. R. ^[9]

Argonne National Lab. (ANL), Argonne, IL (United States)
Clemson Univ., Clemson, SC (United States)
Diakonie-Klinikum (Germany); Institute for Nuclear Research ATOMKI, Debrecen (Hungary)
Argonne National Lab. (ANL), Argonne, IL (United States); United States Naval Academy, Annapolis, MD (United States)
Univ. of Maryland, College Park, MD (United States)
Univ. of Connecticut, Storrs, CT (United States)
Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Illinois at Chicago, Chicago, IL (United States)
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 ≤ 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-06CH11357; FG02-96ER40978

OSTI ID:: 1461420

Alternate ID(s):: OSTI ID: 1436387

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 97; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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