Lifetimes measurements in neutron-deficient 105In and 104Cd isotopes with the plunger technique

In order to extend our information on absolute transition probabilities in the 100Sn region, the lifetimes of the neutron-deficient 105In, 104Cd isotopes have been investigated with the coincidence Recoil Distance Doppler Shift (RDDS) technique following the fusion evaporation reaction 50Cr + 58Ni. The identification of the reaction products was obtained on an event-by-event basis using the Si detector array EUCLIDES. In coincidence with EUCLIDES, γ rays were detected by the GALILEO spectrometer. The experimental method was validated by remeasuring the known lifetime of the lowest-lying states in 104Cd and 105In. The limitations of the Differential Decay Curve Method and Decay Curve Method were analytically illustrated. Five lifetimes in the ground state band (GSB) of 105In and four lifetimes in 104Cd with drastically reduced errors were deduced using the plunger technique. The results are compared with the values adopted in the literature. The lifetime of the 12+ state of 104Cd was measured for the first time. In addition, the measured lifetimes enabled the assessments of the multipolarities of the γ rays depopulating the states of interest. Information on electromagnetic transition strengths were deduced for the γ-ray transitions from the 17/2+ up to 25/2+ states in 105In. In the case of 104Cd, B(E2) strengths were extracted for the lowest-lying 2+ and 4+ states and compared with earlier results of 102Cd and 106Cd to indicate the robust Z = 50 shell closure. While the B(M1) strengths for the 11+ and 12+ states were deduced in order to test the possibility of magnetic rotation in this near spherical nucleus.