Author/Authors :
K. Gulda، نويسنده , , W. Kurcewicz، نويسنده , , A.J. Aas، نويسنده , , M.J.G. Borge، نويسنده , , D.G. Burke، نويسنده , , B. Fogelberg ، نويسنده , , I.S. Grant، نويسنده , , E. Hageb?، نويسنده , , N. Kaffrell، نويسنده , , J. Kvasil، نويسنده , , G. L?vh?iden، نويسنده , , H. Mach، نويسنده , , A. Mackova، نويسنده , , T. Martinez، نويسنده , , G. Nyman، نويسنده , , B. Rubio، نويسنده , , J.L. Tain، نويسنده , , O. Tengblad، نويسنده , , T.F. Thorsteinsen، نويسنده , , ISOLDE collaboration، نويسنده , , et al.، نويسنده ,
Abstract :
The γ-rays following the β− decay of 229Ac have been investigated by means of γ-ray singles and γγ-coincidence measurements using Ge detectors. Multipolarities of 40 transitions in 229Th have been established by measuring conversion electrons with a mini-orange electron spectrometer. The half-lives of the 146.35, 164.53 and 261.96 keV levels have been measured using the advanced time delayed βγγ(t) method. The low-lying states in 229Th and observed transition rates have been interpreted within the quasiparticle–phonon model with inclusion of Coriolis coupling. Two octupole correlated parity partner bands, with Kπ=5/2± and Kπ=3/2±, were identified in 229Th.
Keywords :
Measured , dipole moments , Mass separation , B(XL) , E? , Ge , I? , Si(Li) , EE , Plastic , ATD ???(t) , e?-coincidence , ??-coincidence , I(CE) , BaF2 detectors , 229Th , Radioactivity , deduced levels , 229Th from decay chain of 229Fr , ICC , 229Fr from 232Th(p , multipolarities , 4p) and 238U(p , I? , 6p4n) , rotational bands , T1/2 , Mini-orange spectrometer
