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Lifetime measurements of normal deformed states in Lu-165(71)
KTH, School of Engineering Sciences (SCI), Physics.
Univ Surrey, Dept Phys.
Univ Cologne, Inst Kernphys.
Peking Univ, Sch Phys.
Show others and affiliations
2005 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 71, no 1, 121-127 p.Article in journal (Refereed) Published
Abstract [en]

Picosecond lifetimes of medium spin states in Lu-165 were measured for the first time. The reaction used to populate the nucleus of interest was La-139(Si-30,4n)Lu-165 at a beam energy of 135 MeV. The beam was provided by the XTU-tandem accelerator of Laboratori Nazionali di Legnaro, Italy. By using the differential decay curve method, lifetimes of 19 states in four different rotational bands were obtained. Therefrom the B(E2) values and the transitional quadrupole moments were deduced. The obtained Q(t) for the different bands are compared with total Routhian surface (TRS) calculations and particle-rotor-model calculations. The TRS calculations predict different axial symmetric shapes for the bands built on the 9/2(-)[514], 9/2(+)[404], and 1/2(-)[541] configurations, with a gamma softness for the 9/2(-)[514] configuration. This band has also been studied using the particle-rotor model, the results of which, however, are consistent with a triaxial shape with a gamma value of -15(p).

Place, publisher, year, edition, pages
2005. Vol. 71, no 1, 121-127 p.
Keyword [en]
DECAY CURVE METHOD; MEAN-FIELD; NUCLEI; CONFIGURATION; BANDS
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-8211DOI: 10.1103/PhysRevC.71.014312ISI: 000226701900018Scopus ID: 2-s2.0-18244405559OAI: oai:DiVA.org:kth-8211DiVA: diva2:13470
Note
QC 20100621Available 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
2. 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

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