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Identification of gamma rays from Au-172 and alpha decays of Au-172, Ir-168, and Re-164
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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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.

Place, publisher, year, edition, pages
2009. Vol. 80, no 6, 064310- p.
Keyword [en]
neutron-deficient isotopes, total data readout, proton drip-line, shape, coexistence, nuclei, radioactivity, spectroscopy, elements, states
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-19096DOI: 10.1103/PhysRevC.80.064310ISI: 000273232700020Scopus ID: 2-s2.0-73849132435OAI: oai:DiVA.org:kth-19096DiVA: diva2:337143
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. In-beam Study of Extremely Neutron deficient Nuclei Using the Recoil-Decay Tagging Technique
Open this publication in new window or tab >>In-beam Study of Extremely Neutron deficient Nuclei Using the Recoil-Decay Tagging Technique
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
Nuclear structure
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-4596 (URN)978-91-7178-844-3 (ISBN)
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

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Cederwall, BoBäck, Torbjörn

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