The properties of collective I^Π=1+ states in double even semimagic nucleus 140Ce are investigated in random phase approximation(RPA). The calculation of the B(M1) strength, elastic gamma-scattering cross section σ(gamma)(ω) and gamma-decay width Σ(gamma)(ωi) show that in 140Ce the isovector spin-spin interactions concenrate the main strength of M1 transition at energy 7.89 MeV where the isovector spin-flip magnetic resonance may appear. The predisctions are consistent with the observed M1 strength in 140Ce which is seen to be concentrated within a range of about 0.8 MeV centered at an excitation of 7.95 MeV.
@article{arxiv.nucl-th/0105065,
title = {Spin-vibrational 1+ states in 140Ce},
author = {E. Guliyev and O. Yavas and A. A. Kuliev},
journal= {arXiv preprint arXiv:nucl-th/0105065},
year = {2007}
}