Skip to Main content Skip to Navigation
Journal articles

First direct lifetime measurement of the 2+1 state in 72,74Zn: new evidence for shape transition between N = 40 and N = 42 close to Z = 28

Abstract : We report here the first direct lifetime measurement of the 2+1 state in 72,74Zn. The neutron-rich beam was produced by in-flight fragmentation of 76Ge at the Grand Accélérateur National d'Ions Lourds and separated with the LISE spectrometer. The 2+1 state was excited by inelastic scattering and knock-out reaction on a CD2 target and its lifetime was measured by the recoil-distance Dopplershift method with the Köln plunger device combined with the EXOGAM detectors. The lifetimes of the 2+1 states in 72,74Zn were determined to be 17.9(18) and 27.0(24) ps, which correspond to reduced transition probabilities B(E2; 2+1 \rightarrow 0+) = 385(39) and 370(33) e2fm4, respectively. These values support the idea of a systematic maximum of collectivity at N = 42 for Zn, Ge and Se nuclei. In addition, the available systematics in the neighboring nuclei point towards a transition from a spherical oscillator at N = 40 to complete {\gamma}-softness at N = 42.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00594994
Contributor : Michel Lion <>
Submitted on : Monday, May 23, 2011 - 10:14:29 AM
Last modification on : Friday, November 27, 2020 - 6:02:05 PM

Links full text

Identifiers

Collections

Citation

M. Niikura, B. Mouginot, F. Azaiez, S. Franchoo, I. Matea, et al.. First direct lifetime measurement of the 2+1 state in 72,74Zn: new evidence for shape transition between N = 40 and N = 42 close to Z = 28. Physical Review C, American Physical Society, 2012, 85, pp.054321. ⟨10.1103/PhysRevC.85.054321⟩. ⟨in2p3-00594994⟩

Share

Metrics

Record views

222