Stellar Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis
Journal Article
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· Physical Review Letters
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- 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 (t1/2 = 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- European Commission - Community Research and Development Information Service (CORDIS) - Seventh Framework Programme (FP7); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- 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
Cosmogenic production of Ar 39 and Ar 37 in argon
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journal | August 2019 |
Measurement of Cu 63 , 65 ( n , γ ) Cu 64 , 66 and Co 59 ( n , γ ) Co 60 Maxwellian-averaged neutron-capture cross sections
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journal | December 2019 |
Reactions along the astrophysical s-process path and prospects for neutron radiotherapy with the Liquid-Lithium Target (LiLiT) at the Soreq Applied Research Accelerator Facility (SARAF)
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journal | March 2019 |
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