Stellar Ar36,38(n,γ)Ar37,39 Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis

Tessler, M.; Paul, M.; Halfon, S.; Meyer, B. S.; Pardo, R.; Purtschert, R.; Rehm, K. E.; Scott, R.; Weigand, M.; Weissman, L.; Almaraz-Calderon, S.; Avila, M. L.; Baggenstos, D.; Collon, P.; Hazenshprung, N.; Kashiv, Y.; Kijel, D.; Kreisel, A.; Reifarth, R.; Santiago-Gonzalez, D.; Shor, A.; Silverman, I.; Talwar, R.; Veltum, D.; Vondrasek, R.

doi:10.1103/PhysRevLett.121.112701

Title: Stellar ${}^{36, 38}{Ar} (n, γ) {}^{37, 39}{Ar}$ Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis

Journal Article · 11 September 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.112701 · OSTI ID:1488573

Tessler, M. ^[1]; Paul, M. ^[1]; Halfon, S. ^[2]; Meyer, B. S. ^[3]; Pardo, R. ^[4]; Purtschert, R. ^[5]; Rehm, K. E. ^[4]; Scott, R. ^[4]; Weigand, M. ^[6]; Weissman, L. ^[2]; Almaraz-Calderon, S. ^[4]; Avila, M. L. ^[4]; Baggenstos, D. ^[5]; Collon, P. ^[7]; Hazenshprung, N. ^[2]; Kashiv, Y. ^[7]; Kijel, D. ^[2]; Kreisel, A. ^[2]; Reifarth, R. ^[6]; Santiago-Gonzalez, D. ^[8] more »

Hebrew Univ. of Jerusalem (Israel)
Soreq NRC, Yavne (Israel)
Clemson Univ., SC (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
University of Bern (Switzerland)
Goethe Univ., Frankfurt (Germany)
Univ. of Notre Dame, IN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)

Here, the ³⁶Ar(n,γ) ³⁷Ar (t_1/2 = 35 d) and ³⁸Ar(n,γ) ³⁹Ar (269 yr) reactions were studied for the first time with a quasi-Maxwellian (kT ~ 47 keV) neutron flux for Maxwellian average cross section (MACS) measurements at stellar energies. Gas samples were irradiated at the high-intensity Soreq applied research accelerator facility-liquid-lithium target neutron source and the ³⁷Ar/³⁶Ar and ³⁹Ar/³⁸Ar ratios in the activated samples were determined by accelerator mass spectrometry at the ATLAS facility (Argonne National Laboratory). The ³⁷Ar activity was also measured by low-level counting at the University of Bern. Experimental MACS of ³⁶Ar and ³⁸Ar, corrected to the standard 30 keV thermal energy, are 1.9(3) and 1.3(2) mb, respectively, differing from the theoretical and evaluated values published to date by up to an order of magnitude. The neutron-capture cross sections of ^36,38Ar are relevant to the stellar nucleosynthesis of light neutron-rich nuclides; the two experimental values are shown to affect the calculated mass fraction of nuclides in the region A = 36 – 48 during the weak s process. Finally, the new production cross sections have implications also for the use of ³⁷Ar and ³⁹Ar as environmental tracers in the atmosphere and hydrosphere.

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

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); European Commission - Community Research and Development Information Service (CORDIS) - Seventh Framework Programme (FP7)

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

OSTI ID:: 1488573

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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