Determination of β-decay feeding patterns of 88Rb and 88Kr using the Modular Total Absorption Spectrometer at ORNL HRIBF
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Chinese Academy of Sciences (CAS), Lanzhou (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Warsaw (Poland); Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw (Poland)
- 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)
- Vanderbilt Univ., Nashville, TN (United States)
- Univ. of Warsaw (Poland)
- Univ. of Tennessee, Knoxville, TN (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Tennessee Technological Univ., Cookeville, TN (United States)
- Mississippi State Univ., Mississippi State, MS (United States)
We report precise determination of ground-state feeding in the β decay of fission products is an important but challenging component in modeling reactor antineutrino flux and reactor decay heat. The Modular Total Absorption Spectrometer (MTAS) is a versatile NaI(Tl) detector array that determines the true β-decay pattern free from the pandemonium effect, including precise ground-state feeding intensities. In this paper, we report MTAS results of the β feeding intensities of 88Rb and 88Kr, fission products with large cumulative yields in nuclear reactors. By comparing MTAS results with previous measurements, 88Rb provides a validation of MTAS's ability to determine ground-state feedings in β decays, while the precision of 88Kr ground-state feeding is improved when compared with the Evaluated Nuclear Structure Data File (ENSDF). The investigation of sources that contribute to β feeding branching uncertainties in MTAS experiments is discussed in detail. Lastly, the deconvolution of 88Rb decay spectra suggests that MTAS can distinguish an allowed β spectral shape from a first forbidden unique β spectral shape.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Idaho National Lab. (INL), Idaho Falls, ID (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; FG-05-88ER40407; UMO-2013/08/T/ST2/00624; UMO-2015/18/E/ST2/00217
- OSTI ID:
- 1870201
- Journal Information:
- Physical Review. C, Vol. 105, Issue 5; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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