Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session MB: Quiescent Stellar Burning
2:00 PM–4:30 PM,
Saturday, October 27, 2018
Hilton
Room: Kohala 1
Chair: Frank Strieder, South Dakota School of Mines & Technology
Abstract ID: BAPS.2018.HAW.MB.2
Abstract: MB.00002 : Measurement of the 65Cu Neutron-Capture Cross Section for Constraining s-process Nucleosynthesis
2:15 PM–2:30 PM
Presenter:
Christopher J Prokop
(Los Alamos National Laboratory)
Authors:
Christopher J Prokop
(Los Alamos National Laboratory)
Aaron Couture
(Los Alamos National Laboratory)
Shea Mosby
(Los Alamos National Laboratory)
Gencho Y Rusev
(Los Alamos National Laboratory)
John Leonard Ullmann
(Los Alamos National Laboratory)
Determining the origin of the elements in the observable universe requires detailed knowledge of the salient nuclear physics, such as neutron-capture cross-sections. Recently, the neutron-capture cross-sections of two isotopes, important for the s-process, 63,65Cu, have been called into question. A measurement from 2008 reduced the neutron-capture cross sections of 63,65Cu by ~65% and ~40%, respectively. However, a more recent measurement of 63Cu agrees well with the higher cross section from measurements prior to the 2008 work. This discrepancy is understood as a systematic bias in the 2008 measurement originating from the natural Cu backing material of the neutron production target not properly accounted for when determining the neutron flux. Moreover, it is likely the same systematic bias observed in the 2008 work for 63Cu is present for their 65Cu result as well, and the currently accepted neutron-capture cross section is far too low. Recently, neutron capture on 65Cu was measured using the Detector for Advanced Neutron Capture Experiments was performed at Los Alamos National Laboratory and preliminary results presently agree well with the older measurements. Analysis and results of this most recent measurement will be presented.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.MB.2
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