Lifetime measurement of the first excited2+state inTe112

Abstract

The lifetime of the 2 + → 0 + g.s. transition in the neutron-deficicient nucleus 112 Te has been measured for the first time using the DPUNS plunger and the recoil distance Doppler shift technique. The deduced value for the reduced transition probability is B(E2 :0 + g.s. → 2 + ) = 0.46 ± 0.04 e 2 b 2 , indicating that there is no unexpected enhancement of the B(E2 :0 + g.s. → 2 + ) values in Te isotopes below the midshell. The result is compared to and discussed in the framework of large-scale shell-model calculations.

Recent developments in radioactive charged-particle emissions and related phenomena

“…5.8). One may say that the decay from 186 Po is strongly hindered that the "average" behaviour predicted by the GN law. On the other hand, we emphasize here that it is important to have an overall understanding of all alpha decay properties using UDL before one can draw conclusions on the enhancement or hindrance of the alpha formation probability of specific alpha decay processes.…”

“…It was argued that 100 Sn may be a soft core in analogy to the soft N = Z = 28 core 56 Ni. It seems that such a possibility can be safely ruled out based on indirect information from recent measurements in this region [53,183,184,185,186]. It is still difficult to measure the single-particle states outside the 100 Sn core.…”

“…The α decay transitions of neutron-deficient nuclei around Z = 82 are of particular interest because through such transitions one can uncover features like the co-existence of states with different shapes [241]. Thus, three low-lying 0 + states in 186 Pb were observed following the α decay of 190 Po(gs) [242]. These three states have been found to be of quite different shapes, namely spherical, oblate and prolate.…”

Large-scale configuration interaction description of the structure of nuclei around100Sn and208Pb

“…It was argued that 100 Sn may be a soft core in analogy to the soft N = Z = 28 core 56 Ni. It seems such a possibility can be ruled out based on indirect information from recent measurements in this region [1,17,18,19,20]. It is still difficult to measure the single-particle states outside the 100 Sn core.…”

“…A systematic study on the E2 transition in Te isotopes is done in Ref. [20]. We have done truncation calculations for two isotopes 200,194 Pb by considering the relative importance as defined by the monopole Hamiltonian and monopole+diagonal pairing Hamiltonian.…”