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

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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., . . . Batist, L. (2017). Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb. Physical Review C, 95(2), Article 024320. https://doi.org/10.1103/PhysRevC.95.024320
Published in
Physical Review C
Authors
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, Juho |
Eronen, Tommi |
Moore, Iain |
Penttilä, Heikki |
Äystö, Juha |
Elomaa, Viki-Veikko |
Hakala, Jani |
Jokinen, Ari |
Kolhinen, Veli |
Reponen, Mikael |
Sonnenschein, Volker |
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.
Date
2017
Discipline
KiihdytinlaboratorioAccelerator Laboratory
Copyright
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.

 
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. ...
Publisher
American Physical Society
ISSN Search the Publication Forum
2469-9985
Keywords
neutron emission beta decay total absorption gamma-ray spectroscopy bromi rubidium
DOI
https://doi.org/10.1103/PhysRevC.95.024320
URI

http://urn.fi/URN:NBN:fi:jyu-201704101956

Publication in research information system

https://converis.jyu.fi/converis/portal/detail/Publication/26945783

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  • Matemaattis-luonnontieteellinen tiedekunta [5290]

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