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Lifetime measurements of excited states in 165Lu and 107Cd
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
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 [en]
Nuclear Physics, Experimental Nuclear Strucuture
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-4208ISBN: 91-7178-513-2 (print)OAI: oai:DiVA.org:kth-4208DiVA: diva2:11238
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
List of papers
1. Lifetime measurements of normal deformed states in Lu-165(71)
Open this publication in new window or tab >>Lifetime measurements of normal deformed states in Lu-165(71)
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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).

Keyword
DECAY CURVE METHOD; MEAN-FIELD; NUCLEI; CONFIGURATION; BANDS
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-8211 (URN)10.1103/PhysRevC.71.014312 (DOI)000226701900018 ()2-s2.0-18244405559 (Scopus ID)
Note
QC 20100621Available from: 2008-04-09 Created: 2008-04-09 Last updated: 2010-06-28Bibliographically approved
2. RDM lifetime measurements in 107Cd
Open this publication in new window or tab >>RDM lifetime measurements in 107Cd
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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.

Keyword
DECAY CURVE METHOD; ROTATIONAL BANDS; STATES; ISOTOPES; MOMENTS; NUCLEI
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-6506 (URN)10.1088/0954-3899/31/10/033 (DOI)000232575600035 ()2-s2.0-25444462530 (Scopus ID)
Note
QC 20100621Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2010-06-28Bibliographically approved

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Citation style
  • apa
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  • Other locale
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