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Title: Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br 87 , Br 88 , and Rb 94

Journal Article · · Physical Review. C
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  1. Univ. of Valencia (Spain). Inst. of Corpuscular Physics
  2. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  3. Univ. of Nantes (France). School of Mines. SUBATECH. CNRS/IN2P3
  4. Univ. of Jyvaskyla (Finland). Dept. of Physics
  5. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  6. Polytechnic Univ. of Catalonia, Barcelona (Spain)
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  8. Brookhaven National Lab. (BNL), Upton, NY (United States)
  9. Petersburg Nuclear Physics Inst., Gatchina (Russian Federation)

In this paper, we investigate the decay of 87,88Br and 94Rb using total absorption γ-ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ-ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1-100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width Γγ by one order of magnitude. Finally, this increase in Γγ would lead to a similar increase in the calculated (n, γ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Valencia (Spain); Univ. of Surrey, Guildford (United Kingdom); Univ. of Nantes (France); Univ. of Jyvaskyla (Finland)
Sponsoring Organization:
USDOE Office of Science (SC); Ministry of Economy, Industry and Competitiveness (MINECO) (Spain); Academy of Finland; Engineering and Physical Sciences Research Council (EPSRC); Science and Technology Facilities Council (STFC) (United Kingdom); European Commission (EC)
Contributing Organization:
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain); Polytechnic Univ. of Catalonia, Barcelona (Spain); Petersburg Nuclear Physics Inst., Gatchina (Russian Federation)
Grant/Contract Number:
SC0012704; AC02-06CH11357; SEV-2014-0398; FPA2008-06419; FPA2010-17142; FPA2011-24553; FPA2014-52823-C2-1-P; CPAN CSD-2007-00042; 213503; 605203
OSTI ID:
1358031
Alternate ID(s):
OSTI ID: 1344595
Report Number(s):
BNL-113870-2017-JA
Journal Information:
Physical Review. C, Vol. 95, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (4)

Large Impact of the Decay of Niobium Isomers on the Reactor ν ¯ e Summation Calculations journal January 2019
Experimental study of Tc 100 β decay with total absorption γ -ray spectroscopy journal July 2017
β -decay properties of neutron-rich Ca, Ti, and Cr isotopes journal August 2018
β decay study of the Mn 66 Fe 66 Co 66 Ni 66 decay chain journal December 2018

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