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On the structure of negative-parity states in66Zn and70Ge

Authors
Journal
Nuclear Physics A
0375-9474
Publisher
Elsevier
Publication Date
Volume
386
Issue
2
Identifiers
DOI: 10.1016/0375-9474(82)90118-x
Keywords
  • Nuclear Reactions

Abstract

Abstract Mean lifetimes of negative-parity states in 66Zn and 70Ge have been measured using the recoil distance Doppler shift technique. The states in 66Zn have been studied through the reaction 55Mn( 14N, 2pnγ) 66Zn at E = 47 MeV, those in 70Ge through the reaction 56Fe( 16O, 2pγ) 70Ge at E = 46 MeV. The measurements were performed with a plunger apparatus with a piezo-electric distance regulation. The mean lifetimes in 66Zn were measured to be 66 ± 4ps (5 − state), 43 ± 2 ps (6 − state), 192 ± 15 ps (7 − state), and 2.7 ± 1.2 ps (9 − state), those of 70Ge 19.7 ± 2 ps (5 − state), 51 ± 4 ps (6 − state), and 25.2 ± 1.4 ps (7 − state). Deduced B ( Ml) and B( E2) values are compared with theoretical predictions of a two-proton cluster-vibration coupling model (CVM) which describes these states as couplings of g 9 2 ⊗ (fp shell) proton clusters to zero, one and higher phonon excitations of the corresponding Ni and Zn cores. Good overall agreement between the theoretical values and the experimental data was found.

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