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Energy spectra, B(E2) values, and ratios of the neutron-rich even-even Mo isotopes in the mass 100 region have been investigated in terms of the neutron-proton interacting boson model. Two different approaches were used. The first investigation is based on the validity of the Z =38 subshell closure considering "Sr as a doubly magic core. In the second calculation Z =50 and N =50 were considered as valid closed shells leading to ' Sn as a core. The results from both calculations are compared with experimental data.PACS number(s): 21.60. Fw, 23.20.Lv, 23.20.g, 27.60.+ j

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The level scheme of 57 Cu is investigated via the 1 H( 58 Ni, 57 Cu-␥)2n reaction by using the recoil mass spectrometer MARS at the Texas A&M Cyclotron Institute. Three low-lying excited states are observed in 57 Cu at 1028 Ϯ 4, 1106 Ϯ 4, and 2398 Ϯ 10 keV. The results are compared with well known excited states of the mirror nucleus 57 Ni. The measured excited states of 57 Cu allow recalculation of the astrophysical reaction rate for the stellar radiative proton capture reaction 56 Ni(p,␥) 57 Cu.