Total absorption γ-ray spectroscopy of the β-delayed neutron emitters Br87, Br88, and Rb94

Valencia, E.; Tain, J. L.; Algora, A.; Agramunt, J.; Estevez, E.; Jordan, M. D.; Rubio, B.; Rice, S.; Regan, P.; Gelletly, W.; Podolyák, Z.; Bowry, M.; Mason, P.; Farrelly, G. F.; Zakari-Issoufou, A.; Fallot, M.; Porta, A.; Bui, V. M.; Rissanen, J.; Eronen, T.; Moore, I.; Penttilä, H.; Äystö, J.; Elomaa, V. -V.; Hakala, J.; Jokinen, A.; Kolhinen, V. S.; Reponen, M.; Sonnenschein, V.; Cano-Ott, D.; Garcia, A. R.; Martínez, T.; Mendoza, E.; Caballero-Folch, R.; Gomez-Hornillos, B.; Gorlichev, V.; Kondev, F. G.; Sonzogni, A. A.; Batist, L.

doi:10.1103/PhysRevC.95.024320

Total absorption $γ$ -ray spectroscopy of the $β$ -delayed neutron emitters ${}^{87}{Br}$ , ${}^{88}{Br}$ , and ${}^{94}{Rb}$

Journal Article · Tue Feb 21 00:00:00 EST 2017 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.95.024320· OSTI ID:1358031

Valencia, E. ^[1]; Tain, J. L. ^[1]; Algora, A. ^[1]; Agramunt, J. ^[1]; Estevez, E. ^[1]; Jordan, M. D. ^[1]; Rubio, B. ^[1]; Rice, S. ^[2]; Regan, P. ^[2]; Gelletly, W. ^[2]; Podolyák, Z. ^[2]; Bowry, M. ^[2]; Mason, P. ^[2]; Farrelly, G. F. ^[2]; Zakari-Issoufou, A. ^[3]; Fallot, M. ^[3]; Porta, A. ^[3]; Bui, V. M. ^[3]; Rissanen, J. ^[4]; Eronen, T. ^[4] more »

Univ. of Valencia (Spain). Inst. of Corpuscular Physics
Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
Univ. of Nantes (France). School of Mines. SUBATECH. CNRS/IN2P3
Univ. of Jyvaskyla (Finland). Dept. of Physics
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
Polytechnic Univ. of Catalonia, Barcelona (Spain)
Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
Brookhaven National Lab. (BNL), Upton, NY (United States)
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 Γ_γ by one order of magnitude. Finally, this increase in Γ_γ 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Valencia (Spain); Univ. of Jyvaskyla (Finland); Univ. of Nantes (France); Univ. of Surrey, Guildford (United Kingdom)

Sponsoring Organization:: Academy of Finland; Engineering and Physical Sciences Research Council (EPSRC) (United Kingdom); European Commission (EC) (Belgium); Ministry of Economy, Industry and Competitiveness (MINECO) (Spain); Science and Technology Facilities Council (STFC) (United Kingdom); USDOE; USDOE Office of Science (SC)

Contributing Organization:: Petersburg Nuclear Physics Inst., Gatchina (Russian Federation); Polytechnic Univ. of Catalonia, Barcelona (Spain); Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 1358031

Alternate ID(s):: OSTI ID: 1344595
OSTI ID: 1376891

Report Number(s):: BNL--113870-2017-JA

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 95; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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