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Title:
Nuclear structure of Th229
Authors:
Ruchowska, E.; Płóciennik, W. A.; Żylicz, J.; Mach, H.; Kvasil, J.; Algora, A.; Amzal, N.; Bäck, T.; Borge, M. G.; Boutami, R.; Butler, P. A.; Cederkäll, J.; Cederwall, B.; Fogelberg, B.; Fraile, L. M.; Fynbo, H. O. U.; Hagebø, E.; Hoff, P.; Gausemel, H.; Jungclaus, A.; Kaczarowski, R.; Kerek, A.; Kurcewicz, W.; Lagergren, K.; Nacher, E.; Rubio, B.; Syntfeld, A.; Tengblad, O.; Wasilewski, A. A.; Weissman, L.
Affiliation:
AA(The Andrzej Sołtan Institute for Nuclear Studies, PL 05-400 Świerk, Poland), AB(The Andrzej Sołtan Institute for Nuclear Studies, PL 05-400 Świerk, Poland), AC(Institute of Experimental Physics, University of Warsaw, PL 00-681 Warsaw, Poland), AD(Department of Radiation Sciences, University of Uppsala, SE-751 21 Uppsala, Sweden), AE(Department of Nuclear Physics, Charles University, CZ-18000 Prague 8, Czech Republic), AF(Instituto de Fízica Corpuscular, CSIC-University Valencia, E-46100 Burjassot, Spain), AG(Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United Kingdom), AH(Physics Department, Royal Institute of Technology, SE-106 91 Stockholm, Sweden), AI(Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain), AJ(Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain), AK(Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United Kingdom), AL(ISOLDE, CERN, CH-1211 Geneva 23, Switzerland), AM(Physics Department, Royal Institute of Technology, SE-106 91 Stockholm, Sweden), AN(Department of Radiation Sciences, University of Uppsala, SE-751 21 Uppsala, Sweden), AO(ISOLDE, CERN, CH-1211 Geneva 23, Switzerland), AP(ISOLDE, CERN, CH-1211 Geneva 23, Switzerland), AQ(Department of Chemistry, University of Oslo, Post Office Box 1033 Blindern, N-0315 Oslo, Norway), AR(Department of Chemistry, University of Oslo, Post Office Box 1033 Blindern, N-0315 Oslo, Norway), AS(Department of Chemistry, University of Oslo, Post Office Box 1033 Blindern, N-0315 Oslo, Norway), AT(Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain), AU(The Andrzej Sołtan Institute for Nuclear Studies, PL 05-400 Świerk, Poland), AV(Physics Department, Royal Institute of Technology, SE-106 91 Stockholm, Sweden), AW(Institute of Experimental Physics, University of Warsaw, PL 00-681 Warsaw, Poland), AX(Physics Department, Royal Institute of Technology, SE-106 91 Stockholm, Sweden), AY(Instituto de Fízica Corpuscular, CSIC-University Valencia, E-46100 Burjassot, Spain), AZ(Instituto de Fízica Corpuscular, CSIC-University Valencia, E-46100 Burjassot, Spain), BA(The Andrzej Sołtan Institute for Nuclear Studies, PL 05-400 Świerk, Poland), BB(Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain), BC(The Andrzej Sołtan Institute for Nuclear Studies, PL 05-400 Świerk, Poland), BD(ISOLDE, CERN, CH-1211 Geneva 23, Switzerland)
Publication:
Physical Review C, vol. 73, Issue 4, id. 044326 (PhRvC Homepage)
Publication Date:
04/2006
Origin:
APS
PACS Keywords:
Lifetimes, Collective levels, Electromagnetic moments, 220<, =A
DOI:
10.1103/PhysRevC.73.044326
Bibliographic Code:
2006PhRvC..73d4326R

Abstract

Lifetimes of excited states in Th229, populated in the β decay of Ac229, have been measured using the advanced time-delayed βγγ(t) method. Half-lives of 14 states have been determined including 11 of them for the first time. Twenty-seven new γ lines have been introduced into the β-decay scheme of Ac229 based on results of γγ coincidence measurements. Reduced transition probabilities have been determined for more than 70 γ transitions in Th229. Average |D0| values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest Kπ=1/2±,3/2±, and 5/2± parity partner bands, respectively. Excited states in Th229 and experimental transition rates have been interpreted within the quasiparticle-plus-phonon model. The half-life of the 3.5-eV, 3/2+ isomeric state is predicted to be about 10 h. Potential energy surfaces on the (β23) plane for the lowest single quasiparticle configurations in Th229 have been calculated using the Strutinsky method.
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