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Indentification of Excited States in the Tz=1 Nucleus 110Xe: Evidence for Enhanced Collectivity Near the N=Z=50 Double Shell Closure
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1771-2656
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, 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.

Place, publisher, year, edition, pages
2007. Vol. 99, 022501- p.
Keyword [en]
Excited states; Gamma rays; Ground state; Isotopes; Molecular interactions; Neutrons
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-7353DOI: 10.1103/PhysRevLett.99.022501ISI: 000248021000016Scopus ID: 2-s2.0-34547188159OAI: oai:DiVA.org:kth-7353DiVA: diva2:12349
Note
QC 20100809Available from: 2007-06-25 Created: 2007-06-25 Last updated: 2017-12-14Bibliographically approved
In thesis
1. In-Beam Spectroscopy of the Extremely Neutron Deficient Nuclei 169Ir and 110Xe
Open this publication in new window or tab >>In-Beam Spectroscopy of the Extremely Neutron Deficient Nuclei 169Ir and 110Xe
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:nbn:se:kth:diva-4452 (URN)972-91-7178-692-8 (ISBN)
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
2. In-Beam Spectroscopy of Extremely Neutron Deficient Nuclei 110Xe, 163Ta, 169Ir and 172Hg
Open this publication in new window or tab >>In-Beam Spectroscopy of Extremely Neutron Deficient Nuclei 110Xe, 163Ta, 169Ir and 172Hg
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes new results obtained from experimental studies of the extremely neutron-deficient isotopes 110Xe, 163Ta, 169Ir, and 172Hg, close to the proton drip-line. The experiments used state-of-the-art equipment for nuclear spectroscopy where a large high resolution Germanium-detector array was coupled to a high-transmission recoil separator.The highly selective recoil-decay tagging technique was applied in order to identify andstudy the most weakly populated reaction channels. The work is based on four experimentsperformed at the Accelerator Laboratory of the University of Jyväskylä, Finland. The experimental techniques used and the experimental set-ups are described. Comparisonbetween experimental results and theoretical predictions are made. The thesis also brieflysummarises the theoretical models employed to interpret the experimental data.

The results for 110Xe indicate an emergence of enhanced collectivity near the N=Z linein 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.

The findings for 163Ta reveal three strongly coupled band structures built on differentquasiparticle configurations. The low-lying yrast band exhibits strong signature splittingindicative of a significant triaxial shape asymmetry. An intriguing possibility exits forenhanced octupole correlation in 163Ta, where the odd-proton is proposed to couple to anoctupole-vibrational phonon. However, further investigations are needed to elucidate thisscenario.

Also for 169Ir do the properties of the yrast structure point to a rotational-like behaviourof a moderately deformed nucleus exhibiting a triaxial shape. For neither 163Taor 169Ir do the experimental results fully agree with theoretical predictions for the shapeevolution of the neutron-deficient tantalum and iridium isotopes, approaching the protondrip-line.The nearly constant level spacing in 172Hg between the lowest excited 2+, 4+ and 6+states suggests a transition to a near-spherical harmonic collective vibrational structureas compared with heavier even-even Hg isotopes around the neutron midshell and above.The experimental data have been compared with total Routhian surface calculations and quasiparticle random phase approximation calculations.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 57 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:19
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-10556 (URN)978-91-7415-360-6 (ISBN)
Public defence
2009-06-05, Sal FD5, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100809Available from: 2009-05-26 Created: 2009-05-26 Last updated: 2010-08-09Bibliographically approved

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