Ab initio description of the exotic unbound 7He nucleus

Baroni, Simone; Navratil, Petr; Quaglioni, Sofia

doi:10.1103/PhysRevLett.110.022505

Title: Ab initio description of the exotic unbound ⁷He nucleus

Abstract

In this study, the neutron-rich unbound ⁷He nucleus has been the subject of many experimental investigations. While the ground-state 3/2^– resonance is well established, there is a controversy concerning the excited 1/2^– resonance reported in some experiments as low lying and narrow (E_R~1 MeV, Γ≤1 MeV) while in others as very broad and located at a higher energy. This issue cannot be addressed by ab initio theoretical calculations based on traditional bound-state methods. We introduce a new unified approach to nuclear bound and continuum states based on the coupling of the no-core shell model, a bound-state technique, with the no-core shell model combined with the resonating-group method, a nuclear scattering technique. Our calculations describe the ground-state resonance in agreement with experiment and, at the same time, predict a broad 1/2^– resonance above 2 MeV.

Authors:

Baroni, Simone ^[1]; Navratil, Petr ^[2]; Quaglioni, Sofia ^[3]

Univ. Libre de Bruxelles, Bruxelles (Belgium); TRIUMF, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Fri Jan 11 00:00:00 EST 2013

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1248268

Report Number(s):: LLNL-JRNL-588732
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: 110; Journal Issue: 2; 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


                    Baroni, Simone, Navratil, Petr, and Quaglioni, Sofia. Ab initio description of the exotic unbound 7He nucleus.  United States: N. p., 2013. 
Web.  doi:10.1103/PhysRevLett.110.022505.

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                    Baroni, Simone, Navratil, Petr, & Quaglioni, Sofia. Ab initio description of the exotic unbound 7He nucleus.  United States.  https://doi.org/10.1103/PhysRevLett.110.022505

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                    Baroni, Simone, Navratil, Petr, and Quaglioni, Sofia. Fri .  
"Ab initio description of the exotic unbound 7He nucleus".  United States.  https://doi.org/10.1103/PhysRevLett.110.022505.  https://www.osti.gov/servlets/purl/1248268.

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@article{osti_1248268,

  title        = {Ab initio description of the exotic unbound 7He nucleus},

  author       = {Baroni, Simone and Navratil, Petr and Quaglioni, Sofia},

  abstractNote = {In this study, the neutron-rich unbound 7He nucleus has been the subject of many experimental investigations. While the ground-state 3/2– resonance is well established, there is a controversy concerning the excited 1/2– resonance reported in some experiments as low lying and narrow (ER~1 MeV, Γ≤1 MeV) while in others as very broad and located at a higher energy. This issue cannot be addressed by ab initio theoretical calculations based on traditional bound-state methods. We introduce a new unified approach to nuclear bound and continuum states based on the coupling of the no-core shell model, a bound-state technique, with the no-core shell model combined with the resonating-group method, a nuclear scattering technique. Our calculations describe the ground-state resonance in agreement with experiment and, at the same time, predict a broad 1/2– resonance above 2 MeV.},

  doi          = {10.1103/PhysRevLett.110.022505},

  journal      = {Physical Review Letters},

  number       = 2,

  volume       = 110,

  place        = {United States},

  year         = {Fri Jan 11 00:00:00 EST 2013},

  month        = {Fri Jan 11 00:00:00 EST 2013}

}

Copy to clipboard

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Works referencing / citing this record:

Ab initio predictions for polarized deuterium-tritium thermonuclear fusion
journal, January 2019

Hupin, Guillaume; Quaglioni, Sofia; Navrátil, Petr
Nature Communications, Vol. 10, Issue 1
DOI: 10.1038/s41467-018-08052-6

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Massella, P.; Barranco, F.; Lonardoni, D.
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Three-cluster dynamics within an ab initio framework
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Quaglioni, S.; Romero-Redondo, C.; Navrátil, P.
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DOI: 10.48550/arxiv.1307.8160

Coupled-cluster computations of atomic nuclei
text, January 2013

Hagen, G.; Papenbrock, T.; Hjorth-Jensen, M.
arXiv
DOI: 10.48550/arxiv.1312.7872

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Title: Ab initio description of the exotic unbound 7He nucleus

Abstract

Citation Formats

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Quantum Monte Carlo calculations of nuclei with A <~ 7 journal, October 1997

Effective interactions for the 1p shell journal, November 1965

Nuclear structure in the framework of the Unitary Correlation Operator Method journal, July 2010

Properties of the 7He ground state from 8He neutron knockout journal, August 2009

8He–6He: a comparative study of nuclear fragmentation reactions journal, January 2001

Search for excited states in He 7 with the ( d , p ) reaction journal, December 2005

Energy levels of light nuclei A=5, 6, 7 journal, September 2002

Analog States of He 7 Observed via the He 6 ( p , n ) Reaction journal, June 2004

Recoil proton tagged knockout reaction for 8He journal, January 2012

Medium-Mass Nuclei with Normal-Ordered Chiral N N + 3 N Interactions journal, July 2012

Evidence for a New Low-Lying Resonance State in H 7 e journal, February 2002

Ab initio many-body calculations of nucleon-nucleus scattering journal, April 2009

Quantum Monte Carlo calculations of A = 8 nuclei journal, June 2000

Spectroscopic factor of the 7He ground state journal, February 2007

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Structure of He 7 by proton removal from Li 8 with the ( d , 3 He ) reaction journal, October 2008

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Quantum Monte Carlo calculations of A = 9 , 10 nuclei journal, October 2002

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Experimental evidence for subshell closure in He 8 and indication of a resonant state in He 7 below 1 MeV journal, April 2006

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Chiral effective field theory and nuclear forces journal, June 2011

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Title: Ab initio description of the exotic unbound ⁷He nucleus

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Structure of ${}^{7}{He}$ by proton removal from ${}^{8}{Li}$ with the ( $d,^{3} He$ ) reaction
journal, October 2008

Ab initio many-body calculations of nucleon scattering on ${}^{4}{He}$ , ${}^{7}{Li}$ , ${}^{7}{Be}$ , ${}^{12}C$ , and ${}^{16}O$
journal, September 2010

Quantum Monte Carlo calculations of $A = 9, 10$ nuclei
journal, October 2002

Continuum Effects and Three-Nucleon Forces in Neutron-Rich Oxygen Isotopes
journal, June 2012

Accurate charge-dependent nucleon-nucleon potential at fourth order of chiral perturbation theory
journal, October 2003

Q UANTUM M ONTE C ARLO C ALCULATIONS OF L IGHT N UCLEI
journal, December 2001

Search for a low-energy resonance in 7He with the 7Li(d, 2He) reaction
journal, August 2006

Experimental evidence for subshell closure in ${}^{8}{He}$ and indication of a resonant state in ${}^{7}{He}$ below 1 MeV
journal, April 2006

Observation of an Excited State in ${}^{7}H e$ with Unusual Structure
journal, May 1999

Chiral effective field theory and nuclear forces
journal, June 2011

Spectroscopy of $^{7} He$ states using the $(^{15} N,^{17} F)$ reaction on $^{9} Be$
journal, July 2001

Similarity renormalization group for nucleon-nucleon interactions
journal, June 2007

Structure of drip-line nuclei ^7,8 He via direct reactions
journal, October 2006

Coupled-channel R-matrix method on a Lagrange mesh
journal, September 1998

Ground state energy and width of ${}^{7}{He}$ from ${}^{8}{Li}$ proton knockout
journal, October 2008

Ab initio many-body calculations of deuteron- ${}^{4}{He}$ scattering and ${}^{6}{Li}$ states
journal, April 2011

Quantum Monte Carlo calculations of spectroscopic overlaps in $A ⩽ 7$ nuclei
journal, August 2011

New Isotope of Helium: ${}^{7}{He}$
journal, April 1967

Ab Initio Many-Body Calculations of the ${}^{3}H (d, n) {}^{4}{He}$ and ${}^{3}{He} (d, p) {}^{4}{He}$ Fusion Reactions
journal, January 2012

Further Results on ${}^{7}{He}$
journal, February 1969

Ab Initio Many-Body Calculations of $n − {}^{3}H$ , $n − {}^{4}{He}$ , $p − {}^{3, 4}{He}$ , and $n − {}^{10}{Be}$ Scattering
journal, August 2008

Complex coupled-cluster approach to an ab-initio description of open quantum systems
journal, November 2007

Nuclear Reactions for Astrophysics: Principles, Calculation and Applications of Low-Energy Reactions
book, January 2009

Medium-Mass Nuclei from Chiral Nucleon-Nucleon Interactions
journal, August 2008

Unitary correlation operator method and similarity renormalization group: Connections and differences
journal, June 2008

Solving the resonating-group equation on a Lagrange mesh
journal, October 2002

From low-momentum interactions to nuclear structure
journal, July 2010

Ab initio predictions for polarized deuterium-tritium thermonuclear fusion
journal, January 2019

Coupled-cluster computations of atomic nuclei
journal, September 2014

Exact restoration of Galilei invariance in density functional calculations with quantum Monte Carlo
journal, January 2020

Three-cluster dynamics within an ab initio framework
text, January 2013

Coupled-cluster computations of atomic nuclei
text, January 2013