Description of the l-forbidden γ(M1)-transitions in odd nuclei with A approximately 125

In the framework of the theory of finite Fermi system calculations of the reduced B(M1) probability of the l-forbidden transitions in 1g-2d-3s shell nuclei, where the nucleon pairing effect is important, are carried out. The proper equations for the effective field have been solved in the coordinate representation. Along with spin-spin and spin-isospin interaction of quasiparticles single-pion exchange interaction (SPEI) and spin-orbit interaction (SOI) have been taken into consideration. For taking into account quasiparticle pairing the approximation method for constructing partially-hole propagator is developed. B(M1) calculation results of a number of neutron and proton l-forbidden γ(M1)-transitions in sup(111, 113)Cd, sup(117, 119)Sn, sup(123, 125)Te, 131Xe, sup(133, 135, 137, 139)La, 139Pr, 141Pm nuclei are tabulated. The calculation has been performed without accounting SPEI and with regard to SPEI, spin polarizability and SOI. The SPEI account only slightly changes B(M1). On the whole the calculation results give the reason to assume that the main cause of considerable improvement of the theoretical description of the l-forbidden transitions is SOI account