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

Valencia, E, Tain, JL, Algora, A, Agramunt, J, Estevez, E, Jordan, MD, Rubio, B, Rice, S, Regan, Patrick, Gelletly, William , Podolyak, Zsolt, Bowry, M, Mason, P, Farrelly, GF, Zakari-Issoufou, A, Fallot, M, Porta, A and Bui, VM (2017) Total absorption γ -ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb Physical Review C: Nuclear Physics, 024320.

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Abstract

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 by one order of magnitude. This increase in 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.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Valencia, EUNSPECIFIEDUNSPECIFIED
Tain, JLUNSPECIFIEDUNSPECIFIED
Algora, AUNSPECIFIEDUNSPECIFIED
Agramunt, JUNSPECIFIEDUNSPECIFIED
Estevez, EUNSPECIFIEDUNSPECIFIED
Jordan, MDUNSPECIFIEDUNSPECIFIED
Rubio, BUNSPECIFIEDUNSPECIFIED
Rice, SUNSPECIFIEDUNSPECIFIED
Regan, PatrickP.Regan@surrey.ac.ukUNSPECIFIED
Gelletly, WilliamW.Gelletly@surrey.ac.ukUNSPECIFIED
Podolyak, ZsoltZ.Podolyak@surrey.ac.ukUNSPECIFIED
Bowry, MUNSPECIFIEDUNSPECIFIED
Mason, PUNSPECIFIEDUNSPECIFIED
Farrelly, GFUNSPECIFIEDUNSPECIFIED
Zakari-Issoufou, AUNSPECIFIEDUNSPECIFIED
Fallot, MUNSPECIFIEDUNSPECIFIED
Porta, AUNSPECIFIEDUNSPECIFIED
Bui, VMUNSPECIFIEDUNSPECIFIED
Date : 21 February 2017
Identification Number : 10.1103/PhysRevC.95.024320
Copyright Disclaimer : ©2017 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 23 Feb 2017 09:55
Last Modified : 31 Oct 2017 19:09
URI: http://epubs.surrey.ac.uk/id/eprint/813617

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