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Analysis of the unbound spectrum of 12Li.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0002-1406-5695
GANIL, France.
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2011 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 850, 53-68 p.Article in journal (Refereed) Published
Abstract [en]

The unbound nucleus 12Li is evaluated by studying three-neutron one-proton excitations within the multistepshell model in the complex energy plane. It is found that the ground state of this system consists of anantibound 2− state. A number of narrow states at low energy are found which ensue from the coupling ofresonances in 11Li to continuum states close to threshold.

Place, publisher, year, edition, pages
2011. Vol. 850, 53-68 p.
Keyword [en]
Shell model, Berggren representation, 12Li
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-30286DOI: 10.1016/j.nuclphysa.2010.12.003ISI: 000287270000004Scopus ID: 2-s2.0-78651363890OAI: oai:DiVA.org:kth-30286DiVA: diva2:399318
Funder
Swedish Research Council, 623-2009-7340 2010-4723
Note
QC 20110222Available from: 2011-02-21 Created: 2011-02-21 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Analysis of the Unbound Spectra of 12Li and 13Li
Open this publication in new window or tab >>Analysis of the Unbound Spectra of 12Li and 13Li
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The properties of unbound nuclei 12Li and 13Li are calculated within themultistep shell model in the complex energy plane by assuming that the spectraare determined by the motion of neutrons outside the 9Li core. It is foundthat in 12Li the ground state consists of an antibound 1/2+ state and thatonly this and a 1/2− and a 5/2+ excited states are physically meaningfulresonances. Calculations suggest that there is no bound or antibound statein 13Li.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Instute of Technology, 2011. viii, 36 p.
Series
Trita-FYS, ISSN 0280-316X ; 2010:80
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-30287 (URN)978-91-7415-854-0 (ISBN)
Presentation
2011-02-24, Sal FA31, Roslagstullsbacken 21, AlbaNova, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20110222Available from: 2011-02-22 Created: 2011-02-21 Last updated: 2011-02-22Bibliographically approved
2. Multistep Shell Model in the Complex Energy Plane
Open this publication in new window or tab >>Multistep Shell Model in the Complex Energy Plane
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis the properties of unbound nuclei like 12,13Li are studiedby extending the multistep shell model to the complex energy plane. Thenuclei 12Li and 13Li are described starting from the one-particle states in 10Liand two-particle states in 11Li. The ground state of 12Li is found to be anantibound state. No bound or antibound state is found in 13Li. It is alsoshown that the odd proton plays a minor role in these nuclei.This framework is also applied to study the recently proposed spin-alignedproton-neutron pair coupling scheme. For this the MSM is extended to theproton-neutron space as well as the isospin space. In the model, a nonorthogonalbasis is introduced, which allows us to identify simultaneously theroles played by all configurations. The four-particle, six-particle and eightparticlenuclei in the heaviest N = Z region are evaluated using the MSMbasis within the space spanned by the single 0g9/2 hole shell.A novel Monte Carlo representation in the complex energy plane is alsodeveloped for studying nuclear excitations in the continuum. The calculationson realistic potentials show a stable performance and high accuracy in the oneparticleand two-particle cases. This will provide a convenient tool to studyopen systems with many nucleons in the continuum.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 81 p.
Series
Trita-FYS, ISSN 0280-316X ; 2012:81
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-103867 (URN)978-91-7501-524-8 (ISBN)
Public defence
2012-11-15, FA32, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20121025

Available from: 2012-10-25 Created: 2012-10-23 Last updated: 2012-11-26Bibliographically approved

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