The study of a new short-life isomeric state in 38K

The 38K nucleus having a protone and neutron hole coupled with a 40Ca inert core has a structure analysed easily by the shell model. A new short life, high spin and highly excited isomeric state of the 38K nucleus has been studied in detail using this model. Theoretical aspects connected with static and dynamic electromagnetic moments of the nucleus state, with the magnetic moment of the nucleus and the selection rules according to the isotopic spin are presented in the case of gamma transitions. Experimentallz/ presented in the case of gamma transitions. Experimentally, it has been used a combination between a natural pulsation of the cyclotron beam and an external pulsation by electrostatic deflexion, thus obtaining a pulsation beam of 12-26 MeV alpha particles. As targets, a series of chemical chlorine combinations have been utilized, the isomeric state being obtained by the reaction 35Cl(α,n)38K, having the isomeric level (1fsub(7/2))sub(7+)sup(2). (author)