Spectroscopy of nuclei approaching the proton drip-line using a secondary-fragmentation technique with the RISING detector array

An experiment utilizing a double fragmentation reaction was performed to study isobaric analogue states in A ∼ 50 nuclei approaching the proton drip-line. γ-ray spectroscopy will be used to identify excited states in the neutron-deficient nuclei produced in the second fragmentation reaction. Excited state level schemes will be obtained, through comparison with states in their well-known mirror partners, along with information on Coulomb effects through measurements of the Coulomb energy differences between isobaric analogue excited states. The validity of isospin symmetry for nuclei approaching the proton drip-line can also be investigated and the information gained will aid in testing and improving fp shell model calculations. The analysis of the collected data is at a preliminary stage and current status of this work is reported