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Nuclear structure of Th-229
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2006 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 4Article in journal (Refereed) Published
Abstract [en]

Lifetimes of excited states in Th-229, populated in the beta decay of Ac-229, have been measured using the advanced time-delayed beta gamma gamma(t) method. Half-lives of 14 states have been determined including 11 of them for the first time. Twenty-seven new gamma lines have been introduced into the beta-decay scheme of Ac-229 based on results of gamma gamma coincidence measurements. Reduced transition probabilities have been determined for more than 70 gamma transitions in Th-229. Average parallel to D-0 parallel to values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest K-pi=1/2(+/-),3/2(+/-), and 5/2(+/-) parity partner bands, respectively. Excited states in Th-229 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 (beta(2),beta(3)) plane for the lowest single quasiparticle configurations in Th-229 have been calculated using the Strutinsky method.

Place, publisher, year, edition, pages
American Physical Society , 2006. Vol. 73, no 4
Keyword [en]
a yb nuclei, picosecond lifetime measurements, intrinsic reflection asymmetry, parity-doublet bands, neutron-rich nuclei, 3.5 ev isomer, electromagnetic properties, rotational bands, transition rates, excited-state
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-15647DOI: 10.1103/PhysRevC.73.044326ISI: 000237157300038ScopusID: 2-s2.0-33646232251OAI: diva2:333689

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2015-04-29Bibliographically approved

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Bäck, TorbjörnCederwall, BoKerek, Andras
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