Influence of neutron-core excitations on high-spin states in Sr-88 - art. no. 054314

High-spin states of the nucleus Sr-88 have been studied via the reaction Se -80(B-11,p2n) at a beam energy of 45 MeV. Gamma rays were detected with the six-detector array OSIRIS CUBE. The level scheme of Sr-88 has been extende d up to E approximate to 11 MeV and J = 17. Mean lifetimes of three levels have been determined using the Doppler-shift-attenuation method. The level structures in Sr-88 have been interpreted in terms of the shell model. The calculations were performed in the configuration space (0f(5/2), 1p(3/2), 1 p(1/2), 0g(9/2)) for the protons and (1p(1/2),0g(9/2), 1d(5/2)) for the neu trons. These calculations describe the high-spin level sequences linked by M1 transitions with strengths of B(M1) approximate to 0.3 to 1.4 W.u. as mu ltiplets of seniority v = 4 and 6 states including proton configurations an d neutron-core excitations.