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Title: Neutron-$$\gamma$$ competition for β-delayed neutron emission

Abstract

Here we present a coupled quasiparticle random phase approximation and Hauser-Feshbach (QRPA+HF) model for calculating delayed particle emission. This approach uses microscopic nuclear structure information, which starts with Gamow-Teller strength distributions in the daughter nucleus and then follows the statistical decay until the initial available excitation energy is exhausted. Explicitly included at each particle emission stage is γ-ray competition. We explore this model in the context of neutron emission of neutron-rich nuclei and find that neutron-γ competition can lead to both increases and decreases in neutron emission probabilities, depending on the system considered. Finally, a second consequence of this formalism is a prediction of more neutrons on average being emitted after β decay for nuclei near the neutron drip line compared to models that do not consider the statistical decay.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1345932
Alternate Identifier(s):
OSTI ID: 1336861
Report Number(s):
LA-UR-16-25845
Journal ID: ISSN 2469-9985; TRN: US1701119
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
APS
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; delayed neutron emission; neutron-gamma competition

Citation Formats

Mumpower, Matthew Ryan, Kawano, Toshihiko, and Moller, Peter. Neutron-$\gamma$ competition for β-delayed neutron emission. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.94.064317.
Mumpower, Matthew Ryan, Kawano, Toshihiko, & Moller, Peter. Neutron-$\gamma$ competition for β-delayed neutron emission. United States. doi:10.1103/PhysRevC.94.064317.
Mumpower, Matthew Ryan, Kawano, Toshihiko, and Moller, Peter. Mon . "Neutron-$\gamma$ competition for β-delayed neutron emission". United States. doi:10.1103/PhysRevC.94.064317. https://www.osti.gov/servlets/purl/1345932.
@article{osti_1345932,
title = {Neutron-$\gamma$ competition for β-delayed neutron emission},
author = {Mumpower, Matthew Ryan and Kawano, Toshihiko and Moller, Peter},
abstractNote = {Here we present a coupled quasiparticle random phase approximation and Hauser-Feshbach (QRPA+HF) model for calculating delayed particle emission. This approach uses microscopic nuclear structure information, which starts with Gamow-Teller strength distributions in the daughter nucleus and then follows the statistical decay until the initial available excitation energy is exhausted. Explicitly included at each particle emission stage is γ-ray competition. We explore this model in the context of neutron emission of neutron-rich nuclei and find that neutron-γ competition can lead to both increases and decreases in neutron emission probabilities, depending on the system considered. Finally, a second consequence of this formalism is a prediction of more neutrons on average being emitted after β decay for nuclei near the neutron drip line compared to models that do not consider the statistical decay.},
doi = {10.1103/PhysRevC.94.064317},
journal = {Physical Review C},
number = 6,
volume = 94,
place = {United States},
year = {Mon Dec 19 00:00:00 EST 2016},
month = {Mon Dec 19 00:00:00 EST 2016}
}

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Cited by: 2 works
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Works referenced in this record:

Nuclear Ground-State Masses and Deformations
journal, March 1995

  • Moller, P.; Nix, J. R.; Myers, W. D.
  • Atomic Data and Nuclear Data Tables, Vol. 59, Issue 2, p. 185-381
  • DOI: 10.1006/adnd.1995.1002