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In-beam study of 106Te and 107Te using the recoil decay tagging technique
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Atomic nuclei are complex many-body systems and exhibit an interplay between single-particle and collective degrees of freedom. In order to describe and predict the “behavior” of nucleons inside the nuclei a variety of theoretical models have been created, each applicable to their own domain of nuclear phenomena. Experimental information is needed in order to test and improve the various theoretical models with the ultimate goal of creating unified theory of nuclear structure. In-beam γ-ray spectroscopy is one way of probing the inner structure of nuclei and it is the subject of this thesis, which describes the first identification of excited states in the extremely neutron deficient nuclei 106Te and 107Te. The experiments were performed at the Accelerator Laboratory of the University of Jyväskylä, Finland, using the recoil-decay tagging technique. Prompt γ rays emitted following fusion evaporation reactions were detected by the Jurogam detector array and the selection of the γ rays of interest was based on the recoil identification provided by the RITU gas-filled recoil separator and the GREAT focal plane spectrometer. The production cross sections were estimated to be 25nb and 1μb for 106Te and 107Te, respectively. In case of the nucleus 106Te, several γ rays have been observed. A vibrational-like yrast band has been suggested. For 107Te a number of γ rays have been assigned and a tentative partial level scheme has been suggested. The experimental data have been compared to shell model calculations.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , vii, 28 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:46
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-4060ISBN: 91-7178-407-1 (print)OAI: oai:DiVA.org:kth-4060DiVA: diva2:10592
Presentation
2006-06-16, Sal FB55, AlbaNova univ. centrum, Roslagstullsbacken, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101115Available from: 2006-06-21 Created: 2006-06-21 Last updated: 2011-10-05Bibliographically 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: 2017-12-14Bibliographically 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: 2017-12-14Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
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  • nn-NO
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  • sv-SE
  • Other locale
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Output format
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