Coexisting structures in 115Sn and 116Sn

Abstract Excited states up to I ≈ 20 in 115 Sn and 116 Sn, populated via the ( 18 O, αxn) reactions, have been studied using the DORIS Ge detector array in conjunction with charged particle detectors. In both nuclei, spherical as well as regular, deformed level structures were found. The spherical states are interpreted to arise from pure neutron configurations, while the deformed, intruder bands obviously involve proton 2p-2h excitations across the Z = 50 shell gap.

The decay of153Tb oriented in a gadolinium host

Nuclear orientation of147Tb (T 1/2=1·7 h),149Tb (T 1/2=4·15 h) and151Tb (T 1/2=17·7 h) in a gadolinium host

In-beam study of low-lying levels in the149Sm nucleus

The146Nd(α,n) reaction combined with conventional in-beam spectroscopic methods has been used to study low-lying levels in149Sm. Several new levels andγ-ray transitions have been placed to the149Sm level scheme. Main features of levels below 1 MeV in149Sm have been reproduced in a quasiparticle-rotor model calculation.