Deciphering Nb98 β decay with the Modular Total Absorption Spectrometer at ORNL

Rasco, B. C.; Rykaczewski, K. P.; Fijałkowska, A.; Karny, M.; Wolińska-Cichocka, M.; Grzywacz, R. K.; Stracener, D. W.; Zganjar, E. F.; Batchelder, J. C.; Blackmon, J. C.; Brewer, N. T.; Cooper, M. P.; Goetz, K. C.; Johnson, J. W.; King, T.; Laminack, A.; Matta, J. T.; Miernik, K.; Madurga, M.; Miller, D.; Rajabali, M. M.; Ruland, T.; Shuai, P.; Stepaniuk, M.; Winger, J.

doi:10.1103/physrevc.105.064301

Title: Deciphering Nb 98 β decay with the Modular Total Absorption Spectrometer at ORNL

Journal Article · Fri Jun 03 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.064301· OSTI ID:1871884

Rasco, B. C. ^[1];

^[1]; Fijałkowska, A. ^[2]; Karny, M. ^[3];

^[4];

^[5];

^[1]; Zganjar, E. F. ^[6]; Batchelder, J. C. ^[7]; Blackmon, J. C. ^[6]; Brewer, N. T. ^[5]; Cooper, M. P. ^[8]; Goetz, K. C. ^[9]; Johnson, J. W. ^[1]; King, T. ^[1]; Laminack, A. ^[1];

^[1]; Miernik, K. ^[10]; Madurga, M. ^[8]; Miller, D. ^[11] more »

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Warsaw (Poland); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Warsaw (Poland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw (Poland). Heavy Ion Lab.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Berkeley, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education
Univ. of Warsaw (Poland)
Univ. of Tennessee, Knoxville, TN (United States); MKS Instruments, Inc., Rochester, NY (United States)
Tennessee Technological Univ., Cookeville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Chinese Academy of Sciences (CAS), Lanzhou (China). Inst. of Modern Physics
Mississippi State Univ., Starkville, MS (United States)

An assessment done under the auspices of the Organization for Economic Co-operation and Developement Nuclear Energy Agency (OECD-NEA) in 2007 suggested that the β decays of many abundantly produced fission products in nuclear reactors may be incomplete. In this assessment, the fission product ⁹⁸Nb was assigned the highest priority for study by total absorption spectroscopy due to its large cumulative fission branching fraction and because the β-decay data from several experiments are discrepant. To obtain the complete β-decay feeding pattern of ⁹⁸Nb and determine the impact on the average γ energy per ⁹⁸Nb β decay and v¯e emission calculations. The complete ⁹⁸Nb β-decay feeding pattern includes ground-state to ground-state β feeding and direct β feeding to the 0⁺ first-excited state (both have no associated γ rays), and the ground-state to excited-state β transitions followed by γ transitions to the ground state of the daughter nucleus, ⁹⁸Mo. The complete β-decay intensities of ⁹⁸Nb were measured with the Modular Total Absorption Spectrometer at Oak Ridge National Laboratory (ORNL). Here, the ⁹⁸Nb was produced by the β decay of mass 98 fission fragments at ORNL's On-Line Test Facility (OLTF) using proton-induced fission of ²³⁸U. We find that changes to the current ENSDF assessment of ⁹⁸Nb β-decay intensity are required. We report improved uncertainties for the β-decay feeding values and report new β feedings to high-energy levels in ⁹⁸Mo. A more complete ⁹⁸Nb β-feeding pattern with improved accuracy and precision is offered. The impacts of the measured changes to the ⁹⁸Nb β-feeding pattern on both reactor decay heat calculations and predicted detection rates of reactor v¯e are presented. The Modular Total Absorption Spectrometer measurements of ⁹⁸Nb demonstrate the importance of reexamining and remeasuring complex β-decaying fission products with total absorption spectroscopy, including nuclei very near β stability.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Polish National Centre for Science

Grant/Contract Number:: AC05-00OR22725; FG02-96ER40983; FG02-96ER40978; FG02-96ER41006; SC0016988; UMO-2016/23/B/ST2/03559

OSTI ID:: 1871884

Journal Information:: Physical Review. C, Vol. 105, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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