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In-Beam Spectroscopy of the Extremely Neutron Deficient Nuclei 169Ir and 110Xe
KTH, School of Engineering Sciences (SCI), Physics.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis describes new results obtained from experimental studies of the extremely neutron-deficient isotopes 169Ir and 110Xe, close to the proton drip-line. The experiments use state-of-the-art equipment for nuclear spectroscopy where a large high-resolution Germanium-detector array is coupled to a high-transmission recoil separator and using the highly selective recoil-decay tagging technique. The work is based on two experiments performed at the Accelerator Laboratory of the University of Jyväskylä, Finland. The experimental techniques used are described as are the experimental set-ups. Comparison between experimental results and theoretical predictions are made. The thesis also briefly summarises the theoretical models employed to interpret the experimental results. The results for 169Ir point to a rotational-like behaviour of a moderately deformed nucleus exhibiting triaxial shape. The experimental results do not fully agree with theoretical predictions for the shape evolution of the neutron-deficient iridium isotopes, approaching the proton drip-line. The results for 110Xe indicate an emergence of enhanced collectivity near the N=Z line in the region of the nuclear chart above 100Sn. These findings are interpreted as a possible effect of increased neutron-proton isoscalar pair correlations, a residual interaction effect not accounted for in present-day nuclear models.

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , viii, 42 p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:41
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-4452ISBN: 972-91-7178-692-8 OAI: oai:DiVA.org:kth-4452DiVA: diva2:12350
Presentation
2007-06-14, FB41, AlbaNova, Roslagstullsbacken 21, STOCKHOLM, 15:00
Opponent
Supervisors
Note
QC 20101116Available from: 2007-06-25 Created: 2007-06-25 Last updated: 2010-11-16Bibliographically approved
List of papers
1. First identification of excited states in 169Ir
Open this publication in new window or tab >>First identification of excited states in 169Ir
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2007 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 75, no 5, 054321- p.Article in journal (Refereed) Published
Abstract [en]

Gamma rays populating the alpha-decaying isomeric state in Ir-169 have been observed for the first time. The experiment employed the recoil-decay tagging method using the JUROGAM gamma-ray spectrometer, the RITU gas-filled recoil separator and the GREAT spectrometer located at the RITU focal plane. The gamma-ray cascade feeding the isomeric alpha-decaying state exhibits a rotational structure consistent with a h(11/2) proton coupled to a triaxially deformed core. The experimental results are compared with predictions from total Routhian surface calculations.

Keyword
collective model description; odd-a nuclei; shape coexistence; neutron-deficient; isotopes; radioactivity; band
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7352 (URN)10.1103/PhysRevC.75.054321 (DOI)000246891100031 ()2-s2.0-34547282014 (Scopus ID)
Note
QC 20100809Available from: 2007-06-25 Created: 2007-06-25 Last updated: 2010-08-20Bibliographically approved
2. Indentification of Excited States in the Tz=1 Nucleus 110Xe: Evidence for Enhanced Collectivity Near the N=Z=50 Double Shell Closure
Open this publication in new window or tab >>Indentification of Excited States in the Tz=1 Nucleus 110Xe: Evidence for Enhanced Collectivity Near the N=Z=50 Double Shell Closure
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 99, 022501- p.Article in journal (Refereed) Published
Abstract [en]

Gamma-ray transitions have been identified for the first time in the extremely neutron-deficient (N=Z+2) nucleus Xe110, and the energies of the three lowest excited states in the ground-state band have been deduced. The results establish a breaking of the normal trend of increasing first excited 2+ and 4+ level energies as a function of the decreasing neutron number as the N=50 major shell gap is approached for the neutron-deficient Xe isotopes. This unusual feature is suggested to be an effect of enhanced collectivity, possibly arising from isoscalar n-p interactions becoming increasingly important close to the N=Z line.

Keyword
Excited states; Gamma rays; Ground state; Isotopes; Molecular interactions; Neutrons
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7353 (URN)10.1103/PhysRevLett.99.022501 (DOI)000248021000016 ()2-s2.0-34547188159 (Scopus ID)
Note
QC 20100809Available from: 2007-06-25 Created: 2007-06-25 Last updated: 2010-11-16Bibliographically approved

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