Phys.Rev. C 85, 054321 (2012)

M.Niikura, B.Mouginot, S.Franchoo, I.Matea, I.Stefan, D.Verney, F.Azaiez, M.Assie, P.Bednarczyk, C.Borcea, A.Burger, G.Burgunder, A.Buta, L.Caceres, E.Clement, L.Coquard, G.de Angelis, G.de France, F.de Oliveira Santos, A.Dewald, A.Dijon, Z.Dombradi, E.Fiori, C.Fransen, G.Friessner, L.Gaudefroy, G.Georgiev, S.Grevy, M.Hackstein, M.N.Harakeh, F.Ibrahim, O.Kamalou, M.Kmiecik, R.Lozeva, A.Maj, C.Mihai, O.Moller, S.Myalski, F.Negoita, D.Pantelica, L.Perrot, Th.Pissulla, F.Rotaru, W.Rother, J.A.Scarpaci, C.Stodel, J.C.Thomas, P.Ujic

First direct lifetime measurement of the 2₁⁺ state in ^{72, 74}Zn: New evidence for a shape transition between N=40 and N=42 close to Z=28

NUCLEAR REACTIONS ⁹Be(⁷³Zn, X), (⁷⁴Zn, X), (⁷²Cu, X), [^73,74Zn, ⁷²Cu secondary cocktail beam from ⁹Be(⁷⁶Ge, X), E=60 MeV/nucleon primary reaction], E not given; measured Eγ, Iγ, half-lives of first 2+ states by RDDS method using LISE spectrometer, plunger device, and EXOGAM array at GANIL facility. ^72,74Zn; deduced B(E2), β₂; discussed static quadrupole moments for first 2+ states. Systematics of level energies, B(E2), Q(2+), β₂, occupation numbers for even-even N=32-48, Z=28-38 nuclei. Comparison of B(E2) values for first 2+ states in ^72,74Zn with previous studies and shell-model calculations.

doi: 10.1103/PhysRevC.85.054321