Bulg. J. Phys. vol.27 no.S1 (2000), pp. 017-020


Spin-Vibrational 1+ States in 140Ce

E. Gouliev1, Ö. Yavaş1, A.A. Kuliev 2,3
1Ankara University, Faculty of Sciences Engineering, Ankara, Turkey
2Sakarya University, Faculty of Science and Art, Sakarya, Turkey
3Institute of Physics, Azerbaijan Academy of Science, Baku, Azerbaijan
Abstract. The properties of collective Iπ = 1+ states in double even semi-magic nucleus 140Ce are investigated in spherical random phase approximation (RPA). The calculation of the B(M1) strength, elastic γ-scattering cross section σγ(ω) and γ-decay width Γγ(ωi) show that in 140Ce the isovector spin-spin interactions concentrate the main strength of M1 transition at energy 7.89 MeV where the isovector spin-flip magnetic resonance may appear. These predictions are consistent with the observed [1] 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.

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