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RDM lifetime measurements in 107Cd
KTH, School of Engineering Sciences (SCI), Physics.
Univ Surrey, Dept Phys.
Univ Surrey, Dept Phys.
Yale Univ, WNSL.
Show others and affiliations
2005 (English)In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 31, no 10, S1563-S1568 p.Article in journal (Refereed) Published
Abstract [en]

Lifetimes for decays linking near-yrast states in Cd-107 have been measured using the recoil distance method (RDM). The nucleus of interest was populated via the (MO)-M-98(C-12,3n)(107) Cd fusion-evaporation reaction at an incident beam energy of 60 MeV. From the measured lifetimes, transition probabilities have been deduced and compared with the theoretical B(E2) values for limiting cases of harmonic vibrational and axially deformed rotational systems. Our initial results suggest a rotor-like behaviour for the structure based on the unnatural-parity, h(11/2) orbital in Cd-107, providing further evidence for the role of this 'shape-polanzing' orbital in stabilizing the nuclear deformation in the A similar to 100 transitional region.

Place, publisher, year, edition, pages
2005. Vol. 31, no 10, S1563-S1568 p.
Keyword [en]
DECAY CURVE METHOD; ROTATIONAL BANDS; STATES; ISOTOPES; MOMENTS; NUCLEI
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-6506DOI: 10.1088/0954-3899/31/10/033ISI: 000232575600035Scopus ID: 2-s2.0-25444462530OAI: oai:DiVA.org:kth-6506DiVA: diva2:11237
Note
QC 20100621Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Lifetime measurements of excited states in 165Lu and 107Cd
Open this publication in new window or tab >>Lifetime measurements of excited states in 165Lu and 107Cd
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Measuring lifetimes of excited nuclear states can give important information on the internal structure of the nucleus. This thesis is based on two experiments performed in Italy and in the USA in order to deduce the lifetimes of excited states in 165Lu and 107Cd. The lifetimes were measured using the Recoil Distance Method and the reduced transition probabilities between states have been calculated from the lifetimes in a model independent way. In the analysis of the data from the experiment on 165Lu, the shape of the nucleus is investigated using a collective rotational model to describe the observed excited states. A possibility of a triaxial shape of this nucleus is discussed. In the second experiment the obtained reduced transition probabilities for the nucleus 107Cd are compared to theoretical predictions for vibrational and rotational excitation modes

Place, publisher, year, edition, pages
Stockholm: Fysik, 2006. vii, 37 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:71
Keyword
Nuclear Physics, Experimental Nuclear Strucuture
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-4208 (URN)91-7178-513-2 (ISBN)
Presentation
2006-12-06, FB41, Fysikcentrum, Roslagstullsb. 21, Stockholm, Sweden, 10:00
Opponent
Supervisors
Note
QC 20101108Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2010-11-08Bibliographically approved
2. 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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  • apa
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