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Title: Nuclear structure of {sup 229}Th

Abstract

Lifetimes of excited states in {sup 229}Th, populated in the {beta} decay of {sup 229}Ac, 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 {sup 229}Ac based on results of {gamma}{gamma} coincidence measurements. Reduced transition probabilities have been determined for more than 70 {gamma} transitions in {sup 229}Th. Average |D{sub 0}| values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest K{sup {pi}}=1/2{sup {+-}},3/2{sup {+-}}, and 5/2{sup {+-}} parity partner bands, respectively. Excited states in {sup 229}Th and experimental transition rates have been interpreted within the quasiparticle-plus-phonon model. The half-life of the 3.5-eV, 3/2{sup +} isomeric state is predicted to be about 10 h. Potential energy surfaces on the ({beta}{sub 2},{beta}{sub 3}) plane for the lowest single quasiparticle configurations in {sup 229}Th have been calculated using the Strutinsky method.

Authors:
; ; ; ;  [1]; ;  [2]; ;  [3];  [4]; ; ;  [5]; ;  [6]; ; ; ;  [7];  [8]
  1. Andrzej Soltan Institute for Nuclear Studies, PL 05-400 Swierk (Poland)
  2. Institute of Experimental Physics, University of Warsaw, PL 00-681 Warsaw (Poland)
  3. Department of Radiation Sciences, University of Uppsala, SE-751 21 Uppsala (Sweden)
  4. Department of Nuclear Physics, Charles University, CZ-18000 Prague 8 (Czech Republic)
  5. Instituto de Fizica Corpuscular, CSIC-University Valencia, E-46100 Burjassot (Spain)
  6. Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX (United Kingdom)
  7. Physics Department, Royal Institute of Technology, SE-106 91 Stockholm (Sweden)
  8. Instituto de Estructura de la Materia, CSIC, E-28006 Madrid (Spain) (and others)
Publication Date:
OSTI Identifier:
20771452
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044326; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACTINIUM 229; BETA DECAY; EV RANGE; EXCITED STATES; HALF-LIFE; LIFETIME; NUCLEAR STRUCTURE; PARITY; PHONONS; POTENTIAL ENERGY; PROBABILITY; QUASIPARTICLE-PHONON MODEL; THORIUM 229; TIME DELAY

Citation Formats

Ruchowska, E., Plociennik, W.A., Kaczarowski, R., Syntfeld, A., Wasilewski, A.A., Zylicz, J., Kurcewicz, W., Mach, H., Fogelberg, B., Kvasil, J., Algora, A., Nacher, E., Rubio, B., Amzal, N., Butler, P.A., Baeck, T., Cederwall, B., Kerek, A., Lagergren, K., and Borge, M.G. Nuclear structure of {sup 229}Th. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044326.
Ruchowska, E., Plociennik, W.A., Kaczarowski, R., Syntfeld, A., Wasilewski, A.A., Zylicz, J., Kurcewicz, W., Mach, H., Fogelberg, B., Kvasil, J., Algora, A., Nacher, E., Rubio, B., Amzal, N., Butler, P.A., Baeck, T., Cederwall, B., Kerek, A., Lagergren, K., & Borge, M.G. Nuclear structure of {sup 229}Th. United States. doi:10.1103/PhysRevC.73.044326.
Ruchowska, E., Plociennik, W.A., Kaczarowski, R., Syntfeld, A., Wasilewski, A.A., Zylicz, J., Kurcewicz, W., Mach, H., Fogelberg, B., Kvasil, J., Algora, A., Nacher, E., Rubio, B., Amzal, N., Butler, P.A., Baeck, T., Cederwall, B., Kerek, A., Lagergren, K., and Borge, M.G. Sat . "Nuclear structure of {sup 229}Th". United States. doi:10.1103/PhysRevC.73.044326.
@article{osti_20771452,
title = {Nuclear structure of {sup 229}Th},
author = {Ruchowska, E. and Plociennik, W.A. and Kaczarowski, R. and Syntfeld, A. and Wasilewski, A.A. and Zylicz, J. and Kurcewicz, W. and Mach, H. and Fogelberg, B. and Kvasil, J. and Algora, A. and Nacher, E. and Rubio, B. and Amzal, N. and Butler, P.A. and Baeck, T. and Cederwall, B. and Kerek, A. and Lagergren, K. and Borge, M.G.},
abstractNote = {Lifetimes of excited states in {sup 229}Th, populated in the {beta} decay of {sup 229}Ac, 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 {sup 229}Ac based on results of {gamma}{gamma} coincidence measurements. Reduced transition probabilities have been determined for more than 70 {gamma} transitions in {sup 229}Th. Average |D{sub 0}| values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest K{sup {pi}}=1/2{sup {+-}},3/2{sup {+-}}, and 5/2{sup {+-}} parity partner bands, respectively. Excited states in {sup 229}Th and experimental transition rates have been interpreted within the quasiparticle-plus-phonon model. The half-life of the 3.5-eV, 3/2{sup +} isomeric state is predicted to be about 10 h. Potential energy surfaces on the ({beta}{sub 2},{beta}{sub 3}) plane for the lowest single quasiparticle configurations in {sup 229}Th have been calculated using the Strutinsky method.},
doi = {10.1103/PhysRevC.73.044326},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}