Isomer shift of the 2 + state in 160Gd and 158Gd from recoil implantation Mössbauer studies

Abstract

The Mössbauer effect observed after recoil implantation of Coulomb excited nuclei has been used to measure the change in nuclear charge radius in the 2 + → 0 + rotational transition of 160Gd and 158Gd. The results ( Δ〈 r 2〉/〈 r 2〉) 158 = 0.6 ± 0.3) × 10 −4 and ( Δ〈 r 2〉/〈 r 2〉) 160 = (0.1 ± 0.3) × 10 −4 agree with theoretical predictions and indicate the presence of centrifugal stretching.