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Title: The ORNL analysis technique for extracting β -delayed multi-neutron branching ratios with BRIKEN

Abstract

Here, many choices are available in order to evaluate large radioactive decay networks. There are many parameters that influence the calculated -decay delayed single and multi-neutron emission branching fractions. We describe assumptions about the decay model, background, and other parameters and their influence on β-decay delayed multi-neutron emission analysis. An analysis technique, the ORNL BRIKEN analysis procedure, for determining -delayed multi-neutron branching ratios in β-neutron precursors produced by means of heavy-ion fragmentation is presented. The technique is based on estimating the initial activities of zero, one, and two neutrons occurring in coincidence with an ion-implant and β trigger. The technique allows one to extract β-delayed multi-neutron decay branching ratios measured with the 3He BRIKEN neutron counter. As an example, two analyses of the -neutron emitter 77Cu based on different a priori assumptions are presented along with comparisons to literature values.

Authors:
 [1];  [1];  [2];  [2]; ORCiD logo [3];  [4];  [4];  [4];  [5];  [6];  [6];  [6];  [7];  [8];  [9];  [10];  [11];  [11]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Instituto de Fisica Corpuscular (CSIC-Univ. de Valencia), Valencia (Spain)
  5. Instituto de Fisica Corpuscular (CSIC-Univ. de Valencia), Valencia (Spain); Institute for Nuclear Research (MTA Atomki), Debrecen (Hungary)
  6. Univ. of Edinburgh, Edinburgh (United Kingdom)
  7. VNU Univ. of Science, Hanoi (Viet Nam); RIKEN Nishina Center, Saitama (Japan)
  8. The Univ. of Hong Kong, Hong Kong (China); RIKEN Nishina Center, Saitama (Japan)
  9. RIKEN Nishina Center, Saitama (Japan)
  10. RIKEN Nishina Center, Saitama (Japan); MTA Atomki, Debrecen (Hungary)
  11. Central Michigan Univ., Mount Pleasant, MI (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1479755
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 911; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Neutron detectors; Multi-neutron emission data analysis

Citation Formats

Rasco, Bertis C., Brewer, Nathan T., Yokoyama, R., Grzywacz, R., Rykaczewski, Krzysztof Piotr, Tolosa-Delgado, A., Agramunt, J., Taín, J. L., Algora, A., Hall, O., Griffin, C., Davinson, T., Phong, V. H., Liu, J., Nishimura, S., Kiss, G. G., Nepal, N., and Estrade, A. The ORNL analysis technique for extracting β-delayed multi-neutron branching ratios with BRIKEN. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.09.121.
Rasco, Bertis C., Brewer, Nathan T., Yokoyama, R., Grzywacz, R., Rykaczewski, Krzysztof Piotr, Tolosa-Delgado, A., Agramunt, J., Taín, J. L., Algora, A., Hall, O., Griffin, C., Davinson, T., Phong, V. H., Liu, J., Nishimura, S., Kiss, G. G., Nepal, N., & Estrade, A. The ORNL analysis technique for extracting β-delayed multi-neutron branching ratios with BRIKEN. United States. doi:10.1016/j.nima.2018.09.121.
Rasco, Bertis C., Brewer, Nathan T., Yokoyama, R., Grzywacz, R., Rykaczewski, Krzysztof Piotr, Tolosa-Delgado, A., Agramunt, J., Taín, J. L., Algora, A., Hall, O., Griffin, C., Davinson, T., Phong, V. H., Liu, J., Nishimura, S., Kiss, G. G., Nepal, N., and Estrade, A. Wed . "The ORNL analysis technique for extracting β-delayed multi-neutron branching ratios with BRIKEN". United States. doi:10.1016/j.nima.2018.09.121. https://www.osti.gov/servlets/purl/1479755.
@article{osti_1479755,
title = {The ORNL analysis technique for extracting β-delayed multi-neutron branching ratios with BRIKEN},
author = {Rasco, Bertis C. and Brewer, Nathan T. and Yokoyama, R. and Grzywacz, R. and Rykaczewski, Krzysztof Piotr and Tolosa-Delgado, A. and Agramunt, J. and Taín, J. L. and Algora, A. and Hall, O. and Griffin, C. and Davinson, T. and Phong, V. H. and Liu, J. and Nishimura, S. and Kiss, G. G. and Nepal, N. and Estrade, A.},
abstractNote = {Here, many choices are available in order to evaluate large radioactive decay networks. There are many parameters that influence the calculated -decay delayed single and multi-neutron emission branching fractions. We describe assumptions about the decay model, background, and other parameters and their influence on β-decay delayed multi-neutron emission analysis. An analysis technique, the ORNL BRIKEN analysis procedure, for determining -delayed multi-neutron branching ratios in β-neutron precursors produced by means of heavy-ion fragmentation is presented. The technique is based on estimating the initial activities of zero, one, and two neutrons occurring in coincidence with an ion-implant and β trigger. The technique allows one to extract β-delayed multi-neutron decay branching ratios measured with the 3He BRIKEN neutron counter. As an example, two analyses of the -neutron emitter 77Cu based on different a priori assumptions are presented along with comparisons to literature values.},
doi = {10.1016/j.nima.2018.09.121},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
issn = {0168-9002},
number = C,
volume = 911,
place = {United States},
year = {2018},
month = {10}
}

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Figures / Tables:

Figure 1 Figure 1: Fit of adapted Bateman equation to 77Cu data with an implant-β trigger correlation and no information on the number of neutrons from the 3He tubes. The total fit is shown in orange, 77Cu is shown in red, 77Zn is shown in dark red, 76Zn is shown in blue,more » the background is shown in gray, and the data are shown in black. All decay curves are offset by the background. The granddaughter decays are not shown to preserve clarity.« less

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