High-resolution studies of beta-delayed proton emitters at IGISOL facility

Summary

Beta-decays of²³Al and⁴¹Ti have been studied by applying ion guide techniques, gamma detection and a gas-Si telescope for charged-particle detection. The experimental beta-decay strength of⁴¹Ti was found to be quenched by a factor ofq ² = 0.64 compared to our shell model calculations below 8 MeV excitation energy in⁴¹Sc. This result is in line with the generally accepted value ofq = 0.77. The isobaric analogue state of the⁴¹Ti ground state was measured to contain 10(8)% isospin impurity. This relatively high value could be well reproduced by the shell model calculation in thesdfp space. Gamma-decay of theT = 3/2 isobaric analogue state in²³Mg was observed together with its decay by proton emission. The resonance strength from the ground state of²²Na to the isobaric analogue state in²³Mg was determined as 5.4(17) meV. The experimental proton width, 13(4) meV, agrees with the calculated value of 21 meV.