0185174 - UJF-V 20000348 RIV NL eng J - Článek v odborném periodiku
Aas, A. J. - Mach, H. - Kvasil, J. - Borge, M. J. G. - Fogelberg, B. - Grant, I. S. - Gulda, K. - Hoff, P. - Kurcewicz, W. - Lindroth, A. - Martínez, T. - Macková, Anna - Rubio, B. - Smith, J. F.
Quenched E1 transitions rates in .SUB.231 Th.
Nuclear Physics. A. Roč. 654, - (2000), s. 499-522. ISSN 0375-9474. E-ISSN 1873-1554
Výzkumný záměr: CEZ:AV0Z1048901
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 1.854, rok: 2000

The fast timing á.sub.çç(t) method has been used to measurelifetimes of the low-lying levels in .sub.231 Th populatedin the á.sub.- decay of .sub.231 Ac. The half-life of the K.sub.ă= 5/2.sub.- band-head at 185.7 keV was measured as T.sup.1/2=1073(79) ps, yielding D.sup.o=1.76(8)x10.sub.-2 e.fmand 1.65(6)x10.sub.-2 e.fm for the E1 transitions to the 7/2.sub.+ and 5/2.sub.+ members respectively of the K.sub.ă=5/2.sub.+ groun state band. Furthermore, T.sup.1/2 ó 74 ps andó74 ps were measured for the K.sub.ă = 3/2.sub.+ and 1/2.sub.+ band-heads at 221.4 and 247.6 keV, and T.sup.1/2=503(12) ps and 98(36) ps for the 1/2.sub.- and 3/2.sub.- statesat 554.7 and 593.6 keV, members of the K.sub.ă=1/2.sub.- and3/2.sub.- states at 554.7 and 593.6 keV, members of the K.sub.ă=1/2.sub.- band. The latter results consistently yieldD.sup.o values of the order of 1.1x10.sub.-2 e.fm for threetransitions connecting the K.sub.ă=1/2ń bands. The observedtransistion rates have been interpreted within the quasiparticle-phonon model with the inclusion of Coriolis coupling.
Trvalý link: http://hdl.handle.net/11104/0081586