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In-beam Study of Extremely Neutron deficient Nuclei Using the Recoil-Decay Tagging Technique
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The low-lying structures of the extremely neutron-deficient nuclei 106Te, 107Te, 110Xe, 170Ir and 172Au have been investigated experimentally. Prompt gamma rays emitted in fusion-evaporation reactions were detected by the Jurogam HPGe array. The gamma rays were assigned to specific reaction channels using the recoil-decay tagging technique provided by the gas-filled separator RITU and the GREAT focal-plane spectrometer. The experimental set-up and the technique used to extract the information from the experimental data are described in detail.

Results were interpreted in terms of the nuclear shell model and Total Routhian Surface calculations. In addition, decay studies on 170Ir, 172Au and 164Re led to the discovery of new alpha-decay branches in these nuclei.

Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , x, 57 p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:86
Keyword [en]
Nuclear structure
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-4596ISBN: 978-91-7178-844-3 (print)OAI: oai:DiVA.org:kth-4596DiVA: diva2:13027
Public defence
2008-01-18, FA32, AlbaNova, Roslagstullsbacken 21, stockholm, 14:00
Opponent
Supervisors
Note
QC 20100730Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2012-03-26Bibliographically approved
List of papers
1. First identification of gamma-ray transitions in 107Te
Open this publication in new window or tab >>First identification of gamma-ray transitions in 107Te
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2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, no 6, 064314-1-064314-4 p.Article in journal (Refereed) Published
Abstract [en]

Gamma-ray transitions in Te-107 have been identified for the first time. The experiment, which utilized the recoil decay tagging technique, was performed at the accelerator laboratory of the University of Jyvaskyla, Finland. Prompt gamma rays produced in Ni-58(Cr-52,3n)Te-107(*) reactions were detected by the JUROGAM gamma-ray spectrometer. The gamma rays belonging to Te-107 were selected based on the recoil identification provided by the RITU gas-filled recoil separator and the GREAT focal plane spectrometer. A first excited state at 90 keV, tentatively of g(7/2) character, is proposed.

Keyword
ALPHA-RADIOACTIVITY; NEUTRON-STARS; DECAY; ISOTOPES; SPECTROSCOPY; SEPARATION; NUCLEI; MODEL
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7869 (URN)10.1103/PhysRevC.70.064314 (DOI)000226308100023 ()2-s2.0-84860092261 (Scopus ID)
Note
QC 20100729Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2010-07-29Bibliographically approved
2. First identification of excited states in 106Te and evidence for isoscalar-enhanced vibrational collectivity
Open this publication in new window or tab >>First identification of excited states in 106Te and evidence for isoscalar-enhanced vibrational collectivity
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2005 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 72, no 4, 041303-1-041303-5 p.Article in journal (Refereed) Published
Abstract [en]

Gamma-ray transitions in the extremely neutron-deficient nucleus Te-106 have been identified for the first time. The experiment utilized the Fe-54(Fe-54,2n)Te-106(*) reaction, and the gamma-ray transitions from excited states in Te-106 were selected by use of the recoil-decay-tagging technique. The production cross section was estimated at 25 nb, a new limit for in-beam gamma-ray spectroscopy. A ground-state band tentatively extending up to I-pi=10(+) is proposed. The systematics of low-lying yrast states in the Te isotopes is discussed within the context of vibrational excitations and residual nucleon-nucleon interactions.

Keyword
HIGH-SPIN STATES; SINGLE-PARTICLE; NEUTRON-STARS; NUCLEI; SPECTROSCOPY; DECAY; ISOTOPES; EXCITATIONS; XE-110; LIVES
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7870 (URN)10.1103/PhysRevC.72.041303 (DOI)000232935400004 ()2-s2.0-28844448624 (Scopus ID)
Note
QC 20100729Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2010-08-20Bibliographically approved
3. In-beam gamma-ray and alpha-decay spectroscopy of 170Ir
Open this publication in new window or tab >>In-beam gamma-ray and alpha-decay spectroscopy of 170Ir
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2007 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 76, no 4, 044312-1-044312-8 p.Article in journal (Refereed) Published
Abstract [en]

Excited states in the highly neutron deficient odd-odd nucleus Ir-170 have been investigated. The experiment was performed using the Sn-112(Ni-60, pn)Ir-170 reaction and employing the recoil-decay tagging technique. Gamma rays were detected using the JUROGAM gamma-ray spectrometer and those belonging to Ir-170 were selected based on recoil identification provided by the RITU gas-filled recoil separator and the GREAT spectrometer at the RITU focal plane. A partial level scheme of Ir-170 is presented for the first time. New alpha-decay branches are assigned to Ir-170 and a tentative level structure for Re-166 is deduced from a study of the alpha-decay fine structure and the associated alpha-gamma correlations.

Keyword
ISOTOPES; PROTON; RADIOACTIVITY; COEXISTENCE; NUCLEI; BANDS
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7872 (URN)10.1103/PhysRevC.76.044312 (DOI)000250620900027 ()2-s2.0-35348870483 (Scopus ID)
Note
QC 20100730Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2010-07-30Bibliographically approved
4. Identification of gamma rays from Au-172 and alpha decays of Au-172, Ir-168, and Re-164
Open this publication in new window or tab >>Identification of gamma rays from Au-172 and alpha decays of Au-172, Ir-168, and Re-164
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2009 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 80, no 6, 064310- p.Article in journal (Refereed) Published
Abstract [en]

The very neutron deficient odd-odd nucleus Au-172 was studied in reactions of 342 and 348 MeV Kr-78 beams with an isotopically enriched Ru-96 target. The alpha decays previously reported for Au-172 were confirmed and the decay chain extended down to Tm-152 through the discovery of a new alpha-decaying state in Re-164 [E-alpha=5623(10) keV; t(1/2)=864(-110)(+150) ms; b(alpha)=3(1)%]. Fine structure in these alpha decays of Au-172 and Ir-168 were identified. A new alpha-decaying state was also observed and assigned as the ground state in Au-172 [E-alpha=6762(10) keV; t(1/2)=22(-5)(+6) ms]. This decay chain was also correlated down to Tm-152 through previously reported alpha decays. Prompt gamma rays from excited states in Au-172 have been identified using the recoil-decay tagging technique. The partial level scheme constructed for Au-172 indicates that it has an irregular structure. Possible configurations of the alpha-decaying states in Au-172 are discussed in terms of the systematics of nuclei in this region and total Routhian surface calculations.

Keyword
neutron-deficient isotopes, total data readout, proton drip-line, shape, coexistence, nuclei, radioactivity, spectroscopy, elements, states
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-19096 (URN)10.1103/PhysRevC.80.064310 (DOI)000273232700020 ()2-s2.0-73849132435 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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CiteExportLink to record
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Citation style
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Output format
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