Measuring spin-energy correlations in fission with Gammasphere
ORAL · Invited
Abstract
We analyze an experiment performed at Argonne National Laboratory, with the intention of expanding upon a recent experimental analysis [J. Wilson et al., Nature 590, 566 (2021)] that confirmed the existence of the spin sawtooth in nuclear fission. We combined a twin Frisch-gridded ionization chamber with Gammasphere, a world-class gamma-ray spectrometer which was designed to measure high-multiplicity gamma-ray events. The chamber, loaded with a 252Cf(sf) source, provides a fission trigger, the total kinetic energy (TKE) of the fragments, and the approximate fragment masses. Gammasphere provides the total gamma-ray yield, fragment identification through the tagging of decay gamma rays, and the feeding of rotational bands in the fragments. We will determine how the spin sawtooth varies with the fragments’ TKE by correlating the fragment properties with the distribution of discrete levels that are fed. This approach allows us to explore spin-energy correlations in fission in a nearly model-independent way.
*N. P. G. was supported in-part by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE 1256260. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. This work was in part supported by the Office of Defense Nuclear Nonproliferation Research and Development (DNN R&D), National Nuclear Security Administration, US Department of Energy. This work was funded in-part by the Consortium for Monitoring, Technology, and Verification under Department of Energy National Nuclear Security Administration award number DE-NA0003920. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract Number DE-AC02-06CH11357 (ANL). This research used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.
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Publication:Planned paper, roughly titled, "Measuring spin-energy correlations in fission with Gammasphere"
Presenters
Nathan P Giha
University of Michigan
Authors
Nathan P Giha
University of Michigan
Stefano Marin
University of Michigan
Ivan A Tolstukhin
Argonne National Laboratory
Michael Oberling
Argonne National Laboratory
Russell A Knaack
Argonne National Laboratory
Claus Muller-Gatermann
ANL
Michael P Carpenter
Argonne National Laboratory
Matt D Gott
Argonne National Laboratory
Benjamin Kay
Argonne National Laboratory
Amel Korichi
Université Paris-Saclay
IJCLab, Argonne National Laboratory
Khushi Bhatt
Argonne National Laboratory
Chloé Fougères
Argonne National Laboratory
Vasil Karayonchev
Argonne National Laboratory
Torben Lauritsen
Argonne National Laboratory
Dariusz Seweryniak
Argonne National Laboratory
Nathan Watwood
Argonne National Laboratory
Dana L Duke
Los Alamos Natl Lab
Shea Mosby
Los Alamos Natl Lab
Kristina B Montoya
Los Alamos National Laboratory, Colorado School of Mines
