Spin, lifetime and magnetic moment of a new isomeric state in 120Sb

A Study of the120Sn(p, n?)120Sb reaction

“…In general MI transitions will be favored since El's are typically hindered (e.g. the 69.8 keV transition is hindered by a factor of 2 x 106 [2]). The J~ assignments to levels above 150 keV are made on the basis of the above considerations.…”

“…for the 1 + isomer [6], and n(ds/z)v(si/D for the 3 + isomer [2]. However this simple model suffers some fairly immediate failures, in particular the inability to account for the low-lying 2-state.…”

“…Gamma-gamma coincidences were measured in both Ge (Li)-Ge (Li) (at 6.25 MeV) and Ge (Li)-HPGE (at 4.69 MeV) detector configurations. The overall time resolution was about 15 ns FWHM, however the coincidence window was set approximately 80 ns wide (compared to the beam burst separation of about t10 ns) in order to observe coincidences across the 241 ns 78 keV isomeric state [2,3]. The coincidence data were written on magnetic tape in an event mode, and were analyzed off-line using both Compton and random background subtraction.…”

“…[3] have also studied the *2~ ny) reaction to levels below 450 keV in ~2~ They placed the 3 § isomer at 78 keV above the 1 § isomer, which they assumed to be the ground state. They also postulated the existence of a 8.4 keV 2-state (as predicted in [2]) Present address: Rocky Mountain Energy, Inc. Denver, Colorado, USA 2 Present address: Houston, Texas, USA 3 Present address: Princeton Plasma Physics Lab, Princeton, New Jersey, USA 4 Present address: Molitor, Inc., Englewood, Colorado, USA s Supported in part by U.S. DOE in order to obtain a consistent interpretation of their 7-7 coincidence data; this state must decay by an E1 transition to the ground state and is probably also isomeric. The present study of the 12~ ny) reaction was undertaken in order to extend the results of Adachi et al [3] to higher excitation.…”