Investigation of the Gamow-Teller strength near the doubly-magic nucleus ~(100)Sn

摘要

Neutron deficient nuclei near ~(100)Sn have been produced by projectile fragmentation of a 1 A·GeV ~(112)Sn beam in a beryllium target. The fragments were separated in the magnetic spectrometer FRS at GSI, Darmstadt. The unambigiuously identified ions were stopped in a highly segmented silicon strip detector stack which was designed to measure the halflives and the total energy of emitted particles with very low background and high efficiency. We were able to study ~(102)Sn in decay spectroscopy for the first time and establish a decay scheme for the daughter nuclide ~(102)In. With the measurement of the halflife and the Q-value the Gamow-Teller (GT) strength could be deduced. Additionally the Q-value of ~(98)Cd was measured with high precision.