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Title: 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 J π = 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:
 [1];  [2];  [1];  [2]
  1. TRIUMF, Vancouver, BC (Canada)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1249124
Report Number(s):
LLNL-JRNL-652701
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: 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. doi: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. doi: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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