Half-Lives of Levels in⁹³Sr and⁹⁵Sr

Single-particle structure in neutron-rich Sr isotopes approaching the N=60 shape transition

“…A total absorption spectrometry measurement suggests an even smaller β decay branch to the 213 keV state [25] in agreement with the present interpretation. Furthermore, the angular moment sequence of 5/2 + , 1/2 + , and 3/2 + for the first three states of 93 Sr also matches with the measured conversion coefficients [22], which indicates M1 (and/or E 2) transitions for the decay of the 433 keV state to the ground and first excited state. As a consequence any state that decays to the 213 keV (1/2) + state has to have low angular momentum (1/2 ± , 3/2 ± , or 5/2 + ).…”

“…The present data limits the possible values for the 213 keV state to (1/2, 3/2, 5/2) + , with a slight preference for 1/2 + based on the measured angular distribution for the ground and 213 keV states. The conversion coefficient for the 213 keV transition has been measured and points to a pure E 2 transition [22], therefore we assign J π = (1/2) + to the state at 213 keV. The 433 keV state has not been populated directly in the transfer reaction, which is expected for a 3/2 + state since the 2d 3/2 orbital is higher in energy and is expected to have a low occupancy in the ground state of 94 Sr. A state at 986 keV, which exclusively decays to the ground state was also not observed in the present experiment.…”

Single-particle structure in neutron-rich Sr isotopes approaching the N = 60 shape transition

“…A total absorption spectrometry measurement suggests an even smaller β decay branch to the 213 keV state [25] in agreement with the present interpretation. Furthermore, the angular moment sequence of 5/2 + , 1/2 + , and 3/2 + for the first three states of 93 Sr also matches with the measured conversion coefficients [22] which indicates M 1 (and/or E2) transitions for the decay of the 433 keV state to the ground and first excited state. As a consequence any state that decays to the 213 keV (1/2) + state have to have low angular momentum (1/2 ± , 3/2 ± , or 5/2 + ).…”

“…The present data limits the possible values for the 213 keV state to (1/2, 3/2, 5/2) + , with a slight preference for 1/2 + based on the measured angular distribution for the ground and 213 keV states. The conversion coefficient for the 213 keV transition has been measured and points to a pure E2 transition [22], therefore we assign J π = (1/2) + to the state at 213 keV. The 433 keV state has not been populated directly in the transfer reaction, which is expected for a 3/2 + state since the 2d 3/2 orbital is higher in energy and is expected to have a low occupancy in the ground state of 94 Sr. A state at 986 keV, which exclusively decays to the ground state was also not observed in the present experiment.…”

Half-life measurements of several states inSr95,97,Zr97,100,Hwang1, Ramayya2, Hamilton3 et al. 2006Phys. Rev. C603220View full textAdd to dashboardCite

“…For 95 Sr, in the Enhanced Nuclear Structure Data File (ENSDF) [3], a half-life of 21.7(5) ns is reported for the 556.0 keV state from a weighted average of several measurements [13,14,15]. In the present work, the half-life of the 556.0 keV state is measured from the delayed cascades Tables I and III.…”