Neutron Drip Line in the Ca Region from Bayesian Model Averaging
Abstract
The region of heavy calcium isotopes forms the frontier of experimental and theoretical nuclear structure research where the basic concepts of nuclear physics are put to stringent test. The recent discovery of the extremely neutron-rich nuclei around 60Ca and the experimental determination of masses for 55-57Ca provide unique information about the binding energy surface in this region. To assess the impact of these experimental discoveries on the nuclear landscape’s extent, we use global mass models and statistical machine learning to make predictions, with quantified levels of certainty, for bound nuclides between Si and Ti. Using a Bayesian model averaging analysis based on Gaussian-process-based extrapolations we introduce the posterior probability for each nucleus to be bound to neutron emission. We discover that extrapolations for drip-line locations, at which the nuclear binding ends, are consistent across the global mass models used, in spite of significant variations between their raw predictions. In particular, considering the current experimental information and current global mass models, we suggest that 68Ca has an average posterior probability pex ≈ 76 % to be bound to two-neutron emission while the nucleus 61Ca is likely to decay by emitting a neutron (pex ≈ 46 % ).
- Authors:
-
- Michigan State Univ., East Lansing, MI (United States)
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1513811
- Alternate Identifier(s):
- OSTI ID: 1615737
- Grant/Contract Number:
- NA0003885; SC0013365; SC0018083; NA0002847; SC0008511
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 6; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Neufcourt, Léo, Cao, Yuchen, Nazarewicz, Witold, Olsen, Erik, and Viens, Frederi. Neutron Drip Line in the Ca Region from Bayesian Model Averaging. United States: N. p., 2019.
Web. doi:10.1103/PhysRevLett.122.062502.
Neufcourt, Léo, Cao, Yuchen, Nazarewicz, Witold, Olsen, Erik, & Viens, Frederi. Neutron Drip Line in the Ca Region from Bayesian Model Averaging. United States. https://doi.org/10.1103/PhysRevLett.122.062502
Neufcourt, Léo, Cao, Yuchen, Nazarewicz, Witold, Olsen, Erik, and Viens, Frederi. Thu .
"Neutron Drip Line in the Ca Region from Bayesian Model Averaging". United States. https://doi.org/10.1103/PhysRevLett.122.062502. https://www.osti.gov/servlets/purl/1513811.
@article{osti_1513811,
title = {Neutron Drip Line in the Ca Region from Bayesian Model Averaging},
author = {Neufcourt, Léo and Cao, Yuchen and Nazarewicz, Witold and Olsen, Erik and Viens, Frederi},
abstractNote = {The region of heavy calcium isotopes forms the frontier of experimental and theoretical nuclear structure research where the basic concepts of nuclear physics are put to stringent test. The recent discovery of the extremely neutron-rich nuclei around 60Ca and the experimental determination of masses for 55-57Ca provide unique information about the binding energy surface in this region. To assess the impact of these experimental discoveries on the nuclear landscape’s extent, we use global mass models and statistical machine learning to make predictions, with quantified levels of certainty, for bound nuclides between Si and Ti. Using a Bayesian model averaging analysis based on Gaussian-process-based extrapolations we introduce the posterior probability for each nucleus to be bound to neutron emission. We discover that extrapolations for drip-line locations, at which the nuclear binding ends, are consistent across the global mass models used, in spite of significant variations between their raw predictions. In particular, considering the current experimental information and current global mass models, we suggest that 68Ca has an average posterior probability pex ≈ 76 % to be bound to two-neutron emission while the nucleus 61Ca is likely to decay by emitting a neutron (pex ≈ 46 % ).},
doi = {10.1103/PhysRevLett.122.062502},
journal = {Physical Review Letters},
number = 6,
volume = 122,
place = {United States},
year = {Thu Feb 14 00:00:00 EST 2019},
month = {Thu Feb 14 00:00:00 EST 2019}
}
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