Decay studies of the 𝛽-delayed neutron emitters 87Br and 88Br measured by means of the Modular Total Absorption Spectrometer at ORNL HRIBF

Stepaniuk, Michal; Karny, M.; Fijałkowska, A.; Rykaczewski, Krzysztof P.; Rasco, B. Charles; Grzywacz, Robert K.; Wolińska-Cichocka, Marzena; Allmond, James M.; Batchelder, J. C.; Bingham, C.; Blackmon, J. C.; Brewer, Nathan T.; Go, S.; Goetz, K. C.; Gross, Carl J.; Johnson, J.; Jost, C. U.; Hamilton, J. H.; King, Toby T.; Kolos, K.; Matta, J. T.; Miernik, K.; Madurga, M.; Miller, D.; Nesaraja, Caroline D.; Padgett, S.; Paulauskas, S. V.; Rajabali, M. M.; Stracener, Dan W.; Spejewski, E. H.; Taylor, S.; Wang, E. H.; Winger, J. A.; Xiao, Y.; Zganjar, E. F.

doi:10.1103/PhysRevC.110.054321

Decay studies of the 𝛽-delayed neutron emitters ⁸⁷Br and ⁸⁸Br measured by means of the Modular Total Absorption Spectrometer at ORNL HRIBF

Journal Article · Thu Nov 21 00:00:00 EST 2024 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.110.054321· OSTI ID:2573614

^[1]; Karny, M. ^[2]; Fijałkowska, A. ^[3]; ^[4]; ^[5]; ^[6]; ^[7]; ^[4]; ^[8]; Bingham, C. ^[9]; ^[10]; Brewer, Nathan T. ^[11]; Go, S. ^[9]; Goetz, K. C. ^[9]; Gross, Carl J. ^[4]; Johnson, J. ^[4]; Jost, C. U. ^[4]; Hamilton, J. H. ^[12]; ^[13]; ^[14] more »

Univ. of Warsaw (Poland)
Univ. of Warsaw (Poland); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Warsaw (Poland); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw (Poland)
Univ. of California, Berkeley, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Vanderbilt Univ., Nashville, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Tennessee Technological Univ., Cookeville, TN (United States)
Mississippi State Univ., Mississippi State, MS (United States)

The β decays of ⁸⁷Br, ⁸⁸Br, and ⁸⁷Kr were measured with the Modular Total Absorption Spectrometer (MTAS) at Oak Ridge National Laboratory’s Holifield Radioactive Ion Beam Facility (HRIBF). Both bromine isotopes are β-delayed neutron emitters that have large cumulative fission yields and were identified as top-priority cases for total absorption study by the Nuclear Energy Agency in 2007. Our investigations corroborate that the decay schemes of ⁸⁷Br and ⁸⁸Br suffer from the so-called pandemonium effect. Unique MTAS properties enable direct neutron measurements. Here, we present MTAS-derived β-delayed neutron spectra, β-delayed neutron emission probabilities of P_n (⁸⁷Br) = 2.36(24)%, and P_n (⁸⁸Br) = 6.4(6)%, and the β-delayed neutron transitions intensity of 4(2)% to the first excited ⁸⁷Kr state, populated in the β-neutron decay of 88Br. Incorporating new data into calculations of the electromagnetic decay heat component emitted during thermal neutron fission of ²³⁵U and ²³⁹Pu improves agreement with experimental data up to approximately 80 s after fission. The estimation of the nuclear reactor $$\bar{ν}_e$$ flux results in changes of up to 1% in the expected $$\bar{ν}_e$$ interactions with the detector material for ²³⁵U, ²³⁸U, 239Pu, and ²⁴¹Pu.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Centre (NCN); US Department of Energy; USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-NP)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-96ER40978; FG02-96ER40983; FG02-96ER41006; FG05-88ER40407; SC0016988

OSTI ID:: 2573614

Alternate ID(s):: OSTI ID: 2570829

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 110; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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