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

Abstract

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 increasemore » 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.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [4];  [4] more »;  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [5];  [5];  [5];  [5];  [6];  [6];  [6];  [7];  [8];  [9] « less
  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)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Valencia (Spain); Univ. of Surrey, Guildford (United Kingdom); Univ. of Nantes (France); Univ. of Jyvaskyla (Finland)
Sponsoring Org.:
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 Org.:
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain); Polytechnic Univ. of Catalonia, Barcelona (Spain); Petersburg Nuclear Physics Inst., Gatchina (Russian Federation)
OSTI Identifier:
1358031
Alternate Identifier(s):
OSTI ID: 1344595
Report Number(s):
BNL-113870-2017-JA
Journal ID: ISSN 2469-9985
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
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Batist, L. Total absorption γ-ray spectroscopy of the β-delayed neutron emitters Br87, Br88, and Rb94. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.024320.
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. Total absorption γ-ray spectroscopy of the β-delayed neutron emitters Br87, Br88, and Rb94. United States. doi:10.1103/PhysRevC.95.024320.
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., and Batist, L. Tue . "Total absorption γ-ray spectroscopy of the β-delayed neutron emitters Br87, Br88, and Rb94". United States. doi:10.1103/PhysRevC.95.024320. https://www.osti.gov/servlets/purl/1358031.
@article{osti_1358031,
title = {Total absorption γ-ray spectroscopy of the β-delayed neutron emitters Br87, Br88, and Rb94},
author = {Valencia, E. and Tain, J. L. and Algora, A. and Agramunt, J. and Estevez, E. and Jordan, M. D. and Rubio, B. and Rice, S. and Regan, P. and Gelletly, W. and Podolyák, Z. and Bowry, M. and Mason, P. and Farrelly, G. F. and Zakari-Issoufou, A. and Fallot, M. and Porta, A. and Bui, V. M. and Rissanen, J. and Eronen, T. and Moore, I. and Penttilä, H. and Äystö, J. and Elomaa, V. -V. and Hakala, J. and Jokinen, A. and Kolhinen, V. S. and Reponen, M. and Sonnenschein, V. and Cano-Ott, D. and Garcia, A. R. and Martínez, T. and Mendoza, E. and Caballero-Folch, R. and Gomez-Hornillos, B. and Gorlichev, V. and Kondev, F. G. and Sonzogni, A. A. and Batist, L.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.95.024320},
journal = {Physical Review C},
number = 2,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}

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    Works referencing / citing this record:

    β -decay properties of neutron-rich Ca, Ti, and Cr isotopes
    journal, August 2018