4He+n+n continuum within an ab initio framework
Abstract
In this study, the low-lying continuum spectrum of the 6He nucleus is investigated for the first time within an ab initio framework that encompasses the 4He+n+n three-cluster dynamics characterizing its lowest decay channel. This is achieved through an extension of the no-core shell model combined with the resonating-group method, in which energy-independent nonlocal interactions among three nuclear fragments can be calculated microscopically, starting from realistic nucleon-nucleon interactions and consistent ab initio many-body wave functions of the clusters. The three-cluster Schrödinger equation is solved with three-body scattering boundary conditions by means of the hyperspherical-harmonics method on a Lagrange mesh. Using a soft similarity-renormalization-group evolved chiral nucleon-nucleon potential, we find the known Jπ = 2+ resonance as well as a result consistent with a new low-lying second 2+ resonance recently observed at GANIL at ~2.6 MeV above the He6 ground state. We also find resonances in the 2–, 1+, and 0– channels, while no low-lying resonances are present in the 0+ and 1– channels.
- Authors:
-
- TRIUMF, Vancouver, BC (Canada)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1249124
- Report Number(s):
- LLNL-JRNL-652701
Journal ID: ISSN 0031-9007; PRLTAO
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 113; Journal Issue: 3; 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
Romero-Redondo, Carolina, Quaglioni, Sofia, Navratil, Petr, and Hupin, Guillaume. 4He+n+n continuum within an ab initio framework. United States: N. p., 2014.
Web. doi:10.1103/PhysRevLett.113.032503.
Romero-Redondo, Carolina, Quaglioni, Sofia, Navratil, Petr, & Hupin, Guillaume. 4He+n+n continuum within an ab initio framework. United States. https://doi.org/10.1103/PhysRevLett.113.032503
Romero-Redondo, Carolina, Quaglioni, Sofia, Navratil, Petr, and Hupin, Guillaume. Wed .
"4He+n+n continuum within an ab initio framework". United States. https://doi.org/10.1103/PhysRevLett.113.032503. https://www.osti.gov/servlets/purl/1249124.
@article{osti_1249124,
title = {4He+n+n continuum within an ab initio framework},
author = {Romero-Redondo, Carolina and Quaglioni, Sofia and Navratil, Petr and Hupin, Guillaume},
abstractNote = {In this study, the low-lying continuum spectrum of the 6He nucleus is investigated for the first time within an ab initio framework that encompasses the 4He+n+n three-cluster dynamics characterizing its lowest decay channel. This is achieved through an extension of the no-core shell model combined with the resonating-group method, in which energy-independent nonlocal interactions among three nuclear fragments can be calculated microscopically, starting from realistic nucleon-nucleon interactions and consistent ab initio many-body wave functions of the clusters. The three-cluster Schrödinger equation is solved with three-body scattering boundary conditions by means of the hyperspherical-harmonics method on a Lagrange mesh. Using a soft similarity-renormalization-group evolved chiral nucleon-nucleon potential, we find the known Jπ = 2+ resonance as well as a result consistent with a new low-lying second 2+ resonance recently observed at GANIL at ~2.6 MeV above the He6 ground state. We also find resonances in the 2–, 1+, and 0– channels, while no low-lying resonances are present in the 0+ and 1– channels.},
doi = {10.1103/PhysRevLett.113.032503},
journal = {Physical Review Letters},
number = 3,
volume = 113,
place = {United States},
year = {Wed Jul 16 00:00:00 EDT 2014},
month = {Wed Jul 16 00:00:00 EDT 2014}
}
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