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Title: Informing neutron capture nucleosynthesis on short-lived nuclei with (d, p) reactions

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1404857
Report Number(s):
LLNL-PROC-737114
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Nuclear Physics in Astrophysics VIII, Catania, Italy, Jun 18 - Jun 23, 2017
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Cizewski, J A, Ratkiewicz, A, Escher, J E, Lapilleur, A, Pain, S D, and Potel, G. Informing neutron capture nucleosynthesis on short-lived nuclei with (d, p) reactions. United States: N. p., 2017. Web.
Cizewski, J A, Ratkiewicz, A, Escher, J E, Lapilleur, A, Pain, S D, & Potel, G. Informing neutron capture nucleosynthesis on short-lived nuclei with (d, p) reactions. United States.
Cizewski, J A, Ratkiewicz, A, Escher, J E, Lapilleur, A, Pain, S D, and Potel, G. 2017. "Informing neutron capture nucleosynthesis on short-lived nuclei with (d, p) reactions". United States. doi:. https://www.osti.gov/servlets/purl/1404857.
@article{osti_1404857,
title = {Informing neutron capture nucleosynthesis on short-lived nuclei with (d, p) reactions},
author = {Cizewski, J A and Ratkiewicz, A and Escher, J E and Lapilleur, A and Pain, S D and Potel, G},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 8
}

Conference:
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  • Twelve cross sections for (n,2n), (n,p), (n,np) and (n,n{alpha}) reactions producing short-lived nuclei with half-lives between 15.8 s and 10.3 min have been measured in the energy range between 13.4 and 14.9 MeV by the activation method. The 14 MeV neutrons were generated by using FNS (Fusion Neutronics Source) facility at JAERI. The {gamma}-rays emitted from the irradiated samples were measured with high-purity germanium (HPGe) detectors. The effective energy of incident neutrons were determined by the Nb/Zr method. All cross section of the {sup 27}Al(n,p){sup 27}Mg reaction which was determined by referring to the cross section of the {sup 27}Al(n,{alpha}){supmore » 24}Na reaction. The cross sections of {sup 96}Zr(n,np){sup 95}Y, {sup 120}Sn(n,np){sup 119g}In and {sup 180}Hf(n,p){sup 180}Lu reactions were measured for the first time. The present results were compared with previous data and the evaluated data of JENDL-3 and ENDF/B-VI. The comparison show that some discrepancies exist. Our systematics for (n,p) reactions agrees with the present data within 30%.« less
  • The neutron capture cross sections of /sup 112/Sn, /sup 130/Ba, /sup 146/Nd, /sup 148/Nd, /sup 186/W, /sup 190/Os, and /sup 192/Os at 24 keV neutron energy were measured with respect to /sup 197/Au by activation in a 24 keV neutron beam at the Brookhaven High Flux Beam Reactor. The reliability of this technique was verified by remeasuring the cross section of /sup 186/W and comparing it to previous measurements. This continuing series of measurements will provide a more reliable data base for nucleosynthesis calculations. 12 references.
  • A search has been conducted for light neutral particles like the axions which decay rapidly to electron positron pairs produced in the reaction n + p ..-->.. D + a. Instead the e/sup +/e/sup -/ signal expected from direct internal pair conversion has been detected. A preliminary analysis gives (GAMMA/sub p//GAMMA/sub ..gamma../)/sub expt//(GAMMA/sub p//GAMMA/sub ..gamma../)/sub theo/ = 1.06 +- 0.12. The results exclude existing axion models over the mass range 2 m/sub e/ < m/sub a/ < 2.22 MeV/c/sup 2/. The axion mass would fall in this range if they were responsible for the narrow positron lines observed in recentmore » heavy-ion experiments at the GSI.« less