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gamma-ray spectroscopy of At-197
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0003-1771-2656
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0003-1996-0805
KTH, School of Engineering Sciences (SCI), Physics.
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2008 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 78, no 4, 044328-1-044328-8 p.Article in journal (Refereed) Published
Abstract [en]

Excited states of the extremely neutron-deficient nucleus At-197 have been studied in an in-beam experiment using the fusion-evaporation reaction Sn-118(Kr-82,p2n)At-197. gamma rays belonging to At-197 feeding the I-pi=(9/2(-)) ground state, as well as gamma rays feeding the 311-keV I-pi=(13/2(+)) isomer, decaying via the emission of gamma rays, and the 52-keV I-pi=(1/2(+)) alpha-decaying isomer have been identified using the recoil-alpha-decay tagging technique. Total Routhian surface calculations predict a near-spherical shape for the (9/2(-)) ground state and oblate shapes with beta(2) around -0.2 for the (1/2(+)) and the (13/2(+)) states. These predictions agree with our experimental findings.

Place, publisher, year, edition, pages
2008. Vol. 78, no 4, 044328-1-044328-8 p.
Keyword [en]
HIGH-SPIN STATES, ALPHA-DECAY, BI-187, BI-189 ISOTOPES, EXCITED-STATES, MEAN-FIELD, NUCLEI, IDENTIFICATION, DEFORMATION, BEHAVIOR
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-8209DOI: 10.1103/PhysRevC.78.044328ISI: 000260574700043Scopus ID: 2-s2.0-55849132529OAI: oai:DiVA.org:kth-8209DiVA: diva2:13468
Note
QC 20100621Available from: 2008-04-09 Created: 2008-04-09 Last updated: 2010-08-20Bibliographically approved
In thesis
1. Studies of collective phenomena in neutron deficient nuclei: by means of lifetime measurements, angular correlation measurements and the recoil-decay tagging technique
Open this publication in new window or tab >>Studies of collective phenomena in neutron deficient nuclei: by means of lifetime measurements, angular correlation measurements and the recoil-decay tagging technique
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The nucleus is a mesoscopic system that retains features from both the quantum and macroscopic worlds. A basic property of a macroscopic body is its shape. Nuclear shapes can be deduced from experimental data as they influence the excitation mode of the nucleus and hence the energies and lifetimes of its excited levels. Various short-lived nuclei were created in fusion-evaporation experiments performed at international heavy-ion accelerator facilities. The emitted γ rays and, in some experiments, also the charged particles and neutrons emitted in the reactions were detected. The studied neutron-deficient isotopes were either selected by the type and number of particles emitted in the reactions, or by using their characteristic decays. The excited states of the different isotopes were extracted from the γ-ray analyses. Spectroscopic properties, such as the lifetimes of the excited states or the angular distribution of the emitted γ rays were measured when possible. The experimentally obtained level schemes together with the other spectroscopic information were used to deduce the excitation modes and the shapes of the studied nuclei. The detector systems are described in the first chapter and in the second chapter some techniques used to extract information from the experimental data are explained. Finally, a brief theoretical overview on the nuclear models which were used to interpret the experimental results is given.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. x, 57 p.
Series
Trita-FYS, ISSN 0280-316X ; 2008:15
Keyword
heavy-ion reactions, multi-detector arrays, recoil separator, in-beam gamma-ray spectroscopy, high spin states, lifetime measurements, recoil-decay tagging, nuclear shape
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-4693 (URN)978-91-7178-929-7 (ISBN)
Public defence
2008-04-28, FA32, AlbaNova, 10691 Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100621Available from: 2008-04-09 Created: 2008-04-09 Last updated: 2010-08-20Bibliographically approved

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Cederwall, BoBäck, Torbjörn

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