Realistic shell-model calculations for neutron deficient Sn isotopes

We have performed shell-model calculations for Sn-102,Sn-103,Sn-104,Sn-105 using two realistic effective interactions derived from the Bonn A and Paris nucleon-nucleon potentials, respectively. From the comparison of the calculated spectra of Sn-104 and Sn-105 with the experimental ones it turns out that the best agreement is obtained with the weaker tensor force potential (Bonn A). This agreement appears to be significantly better than for other nuclear regions, such as the sd shell, and thus encourages use of modern realistic potentials in shell-model calculations for medium- and heavy-mass nuclei. In addition, it supports confidence in our predictions of the spectra of the hitherto unknown isotopes Sn-102 and Sn-103.