Comparative quadrupole moments of superdeformed bands in 193−196Pb

doi:10.1016/S0370-2693(98)00819-3

Physics Letters B

Volume 434, Issues 1–2, 20 August 1998, Pages 14-20

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Abstract

Lifetimes have been measured for states in five superdeformed yrast bands in ^193−196Pb using the Gammasphere spectrometer array. Centroid shifts and lineshapes of transitions showing attenuated Doppler shifts have been analyzed. Transition quadrupole moments are deduced for the five bands including, for the first time, bands of two odd-A Pb isotopes. The quadrupole moments are found to be remarkably similar for the yrast bands in ¹⁹⁴Pb (band 1), ¹⁹⁵Pb (bands 1 and 2) and ¹⁹⁶Pb (band 1) (Q_t≈20 b). However, for ¹⁹³Pb a smaller value, Q_t=17.3(7) b, is obtained. This can be explained in terms of the occupation of the neutron N = 7 intruder orbitals.

PACS

21.10.Re

23.20.Ck

27.80.+w

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¹: Present address: W.A. Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, USA.