ISSN:
1434-601X
Schlagwort(e):
21.10.HW
;
23.20.−g
;
27.50.+ e
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We report on the first in-beam study of high spin levels in83Y which were established up to 9.0 MeV excitation energy and probable spin of 41/2+ resp. 27/2− by means of the reaction58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10−12–10−9 s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form ag 9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformationβ 2=0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency ħω≈0.40 MeV which we associate with twoquasiparticleg 9/2 proton alignment. At 2.56 MeV excitation, a second ΔI=1 band starting with 17/2− was found. On the basis of the similarity to85Y and the very weakE2 decay of this state, we suggest that this band has (3qp) configuration with an alignedg 9/2 neutron pair. The lifetimes of the lowest 2+ and 4+ state in84Zr populated in the reaction58Ni (28Si, 2p) were determined to be τ(2)=17.8(11) ps resp. τ(4)=3.5(4) ps.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01294346
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