Low-velocity transient-field technique with radioactive ion beams; factor of the first excited state in Zn

放射性イオンビームを用いた低速過渡電場法; Znの第一励起状態の因子

Illana, A.*; Jungclaus, A.*; Orlandi, R.  ; Perea, A.*; Bauer, C.*; Briz, J. A.*; Egido, J. L.*; Gernhuser, R.*; Leske, J.*; Mcher, D.*; Pakarinen, J.*; Pietralla, N.*; Rajabali, M.*; Rodrguez, T. R.*; Seiler, D.*; Stahl, C.*; Voulot, D.*; Wenander, F. K.*; Blazhev, A.*; De Witte, H.*; Reiter, P.*; Seidlitz, M.*; Siebeck, B.*; Vermeulen, M. J.*; Warr, N.*

Illana, A.*; Jungclaus, A.*; Orlandi, R.; Perea, A.*; Bauer, C.*; Briz, J. A.*; Egido, J. L.*; Gernhuser, R.*; Leske, J.*; Mcher, D.*; Pakarinen, J.*; Pietralla, N.*; Rajabali, M.*; Rodrguez, T. R.*; Seiler, D.*; Stahl, C.*; Voulot, D.*; Wenander, F. K.*; Blazhev, A.*; De Witte, H.*; Reiter, P.*; Seidlitz, M.*; Siebeck, B.*; Vermeulen, M. J.*; Warr, N.*

The factor of the first excited state in Zn was measured using the transient-field technique in combination with Coulomb excitation. The experiment was ran at REX-ISOLDE, CERN, and the -ray perturbed angular correlations were measured using 4 triple Germanium clusters of the Miniball array. The experimental result (2) = +0.47(14) is significant to establish the structure of the Zn isotopes near N=40. Comparison with shell-model calculations reveal that to reproduce the measured energies and B(E2) of the Zn isotopes around N=40, both the proton excitations from the orbit and neutron excitations into the and orbits are essential. Furthermore, beyond-mean-field calculations reveal the need to include the triaxial degree of freedom.