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Measurement of fragment-correlated γ-ray emission from 252Cf(sf)

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [2];  [4];  [5]
  1. University of Michigan, Ann Arbor, MI (United States); MTV/University of Michigan, NERS
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. University of Michigan, Ann Arbor, MI (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. University of Michigan, Ann Arbor, MI (United States)
+ Show Author Affiliations
This paper presents recent experimental results on the yield of prompt fission γ rays from the spontaneous fission of 252Cf. We use an ionization chamber to tag fission events and measure the masses and kinetic energies of the fission fragments and trans-stilbene organic scintillators to measure the neutrons and γ rays emitted by the fission fragments. The combination of the ionization chamber and trans-stilbene scintillators allows us to determine the properties of neutrons and γ rays in coincidence with the fragments. The yield of γ rays is known to be influenced by the angular momenta (AM) of the fission fragments. We present experimental evidence indicating that the total γ-ray multiplicity, i.e., the sum of both fragments' emission, saturates at sufficiently high internal fragment excitation energies. We also observe distinct behaviors for the yield of γ rays from the light and heavy fragments, which for certain mass and total kinetic energy (TKE) regions are weakly or anticorrelated, indicating the presence of complex AM generation modes. We also observed a mass- and TKE-dependent anisotropy of the γ rays, which challenges and expands on the conventional notion that the fragments' AM are always aligned perpendicularly to the fission axis. Furthermore, the dependence of the anisotropy on mass and TKE indicates a dependence of these properties on the specific fission channels, thus providing an insight into the deformations and dynamics in fission and their connection with experimentally observable quantities.
Research Organization:
University of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725; NA0003920
OSTI ID:
2406910
Alternate ID(s):
OSTI ID: 2356898
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 109; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A ≥ 220
Fission
Nuclear reactions