High-spin study of neutron-deficient Xe-114

摘要

High-spin states have been populated in Xe-114(54) via the Ni-58(Ni-58, 2p) reaction at 210 MeV, using the JUROSPHERE gamma-ray spectrometer to record gamma-ray coincidences. The known level scheme has been significantly extended and includes two positive-parity and three negative-parity structures. At the highest spins, one of the negative-parity bands becomes yrast and shows the characteristics of a smoothly terminating band, Quadrupole moments for two of the bands at high spin have been estimated through a Doppler-broadened lineshape analysis; the terminating band has a reduced quadrupole moment implying that it is not far from full termination into a noncollective oblate state. Extracted B(E1) strengths are discussed in terms of possible octupole collectivity (C) 2000 Elsevier Science B.V. All rights reserved. [References: 27]