Abstract
The42Ca levels at 4,715 and 6,633 keV excitation energy have been investigated using the39 K(α,pγ reaction atE α=14 and 15 MeV. From particle-γ-ray angular correlations the spin assignmentsJ(4,715)=6, 4 andJ(6,633)=8, 6, 4 have been obtained. Lifetime measurements using the Doppler-shift attenuation method yieldedτ (4,715)=120±46 fs andτ(6,633)=52±21 fs. Both levels have positive parity and decay by enhancedE2 transitions. They are interpreted as theJ π=6+ and 8+ members, respectively, of theK π=0+ rotational band which has theE x =1,837, 2,423 and 3,250 keV states as further members. The enhancement of inbandE2 transitions is 50 +35−16 W.u. (6→4) and 63 W.u. (8→6) respectively. The intrinsic quadrupole moments which have been derived on the basis of the coexistence model, areQ 0=1.13−0.16/+0.37b(8→6) andQ 0=1.36±0.25b(6→4), respectively. TheJ π=10+ member of the rotational band has possibly been observed as a level at 8,856±5 keV excitation energy.
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Work supported by Deutsche Forschungsgemeinschaft.
The authors gratefully acknowledge the help of W. Brendler, F. Glatz, and A. Hoffmann during the measurements, as well as the help of Miss G. Born and the staff of the accelerator.
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Betz, P., Bitterwolf, E., Busshardt, B. et al. Deformed states of high spin in42Ca. Z Physik A 276, 295–302 (1976). https://doi.org/10.1007/BF01412107
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DOI: https://doi.org/10.1007/BF01412107