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Excited states in the neutron-deficient nuclei Rn-197,Rn-199,Rn-201
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.
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. 77, no 5, 054303-1-054303-7 p.Article in journal (Refereed) Published
Abstract [en]

Excited states of the extremely neutron-deficient radon isotopes with N = 111, 113, 115 have been studied for the first time in a series of in-beam experiments performed at the Accelerator Laboratory of the University of Jyvaskyla. The reactions used were: Sn-118(Kr-82, 3n)Rn-197, Sn-120(Kr-82, 3n)Rn-199, Sm-150(Cr-52, 3n)Rn-199, and Sn-122(Kr-82, 3n)Rn-201. The gamma rays emitted from excited states in the different isotopes were identified using the recoil-alpha-decay tagging technique. The estimated cross section for the production of Rn-197(m) was 7(3) nb, which is the lowest cross section reported so far for an in-beam study. The energies of the (17/2(+)) levels built on the isomeric (13/2(+)) states in Rn-197,Rn-199,Rn-201 indicate a transition from an anharmonic vibrational structure toward a rotational structure at low spins for these nuclei. However, the transition is not as sharp as predicted by theory.

Place, publisher, year, edition, pages
2008. Vol. 77, no 5, 054303-1-054303-7 p.
Keyword [en]
EVEN-EVEN NUCLEI; GAMMA-RAY SPECTROSCOPY; ALPHA-DECAY; MEAN-FIELD; ISOTOPES; RN-198
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-8208DOI: 10.1103/PhysRevC.77.054303ISI: 000256885600013Scopus ID: 2-s2.0-43449092879OAI: oai:DiVA.org:kth-8208DiVA: diva2:13467
Note
QC 20100620Available from: 2008-04-09 Created: 2008-04-09 Last updated: 2017-12-14Bibliographically 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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