Coulomb excitation of the 3(-) isomer in (70)Cu

E. Rapisarda , I. Stefanescu , D. L. Balabanski , B. Bastin , A. Blazhev , N. Bree , M. Danchev , B. Bruyneel , T. Davinson , P. Delahaye , J. Diriken , J. Eberth , G. Georgiev (1) , D. Fedorov , V. N. Fedosseev , E. Fiori (1) , S. Franchoo (2) , C. Fransen , K. Geibel , K. Gladnishki , K. Hadynska , H. Hess , K. Heyde , M. Huyse , O. Ivanov , J. Iwanicki , J. Jolie , M. Kalkuehler , T. Kroll , R. Krucken , U. Koster , G. Lo Bianco , Radomira Lozeva (1, 3) , B. A. Marsh , S. Nardelli , F. Nowacki (3) , N. Patronis , P. Reiter , M. Seidlitz , K. Sieja (3) , N. Smirnova (4) , J. Srebrny , J. van de Walle , P. van Duppen , N. Warr , F. Wenander , K. Wimmer , K. Wrzosek , S. Zemlyanoi , M. Zielinska

1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 IPHC - Institut Pluridisciplinaire Hubert Curien
4 THEORIE - Physique théorique

Post-accelerated isomerically purified radioactive beams, available at the CERN On-Line Isotope Mass Separator facility using the resonant ionization laser technique, have been used to study the Coulomb excitation of the I(pi) = 3(-) state in (70)Cu (Z = 29, N = 41). While first results using a I(pi) = 6(-) beam were reported previously, the present complementary experiment allows us to complete the study of the multiplet of states (3(-), 4(-), 5(-), 6(-)) arising from the pi 2p(3)/(2)nu 1g(9/2) configuration. Besides the known gamma-ray transition deexciting the 4(-) state, a ground-state. ray of 511(3) keV was observed for the first time and was unambiguously associated with the 5(-) state deexcitation. This observation fixes the energy, spin, and parity of this state, completing the low-energy level scheme of (70)Cu. B(E2) values for all possible E2 transitions within the multiplet were determined. A comparison with large-scale shell model calculations using different interactions and valence spaces shows the importance of proton excitation across the Z = 28 shell gap and the role of the 2d(5/2) neutron orbital.

Mots clés: SEPARATION; DETECTOR; CU-66

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

E. Rapisarda, I. Stefanescu, D. L. Balabanski, B. Bastin, A. Blazhev, et al.. Coulomb excitation of the 3(-) isomer in (70)Cu. Physical Review C, 2011, 84, pp.064323. ⟨10.1103/PhysRevC.84.064323⟩. ⟨in2p3-00663809⟩