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Decay Properties of 100 Sn *

The analysis of the data obtained in 2008 [1] for neutron deficient nuclei produced by fragmentation of a 124 Xe beam has progressed. Here we concentrate on the decay properties of 100 Sn, of which we identified about 250 ions. The time distribution of decay events after 100 Sn im-plantation in the same or neighbouring of the 1mm 3 pixels of the implantation detector yielded a preliminary value for the half-life of 1.16(0.20)s. This is much more precise than earlier values measured at GSI [2,3] or at MSU [4]. Fig. 1: E-spectrum of events following the implantation of identified 100 Sn nuclei. The red curve shows the calculated spectrum for an endpoint energy adjusted to have the same centroid as the measured spectrum in the range indicated by the blue bar. Fig. 2: J-spectrum of events following the E-decay of identified 100 Sn nuclei. The low-energy part is shown enlarged in the inset. The E-decay of 100 Sn is supposed to populate essentially a single 1 + state in 100 In, that is formed by coupling the g 9/2 proton hole to a g 7/2 neutron particle. In order to determine the decay energy we had placed on either side of the implantation detector 10mm of Si detectors as calo-rimeter. For every decay event the energies deposited in the implantation and calorimeter detectors were summed up and yielded the spectrum shown in Fig. 1. Around 200 keV there is a line originating presumably from a sum of converted transitions after electron capture decay. From the centroid of the energy distribution in the range indicated by the blue bar we determined a preliminary value for the endpoint energy of 3.15(20)MeV. There are still small corrections necessary for energy losses in the dead layers, but the quality of this result is very much improved compared to our earlier estimate based on 7 decays [2,3]. With the preliminary values for half-life and decay energy we calculate a log(ft) value of 2.54(20) which is the smallest of all known E-decays and thus 100 Sn shows the largest transition strength. The Gamov-Teller strength B GT =11(4) shows a reduction by only a factor 1.6 compared to the value from the extreme single-particle model, where 10 protons contribute to the decay. With the 105 Ge-detectors of the RISING setup we measured with high efficiency for the first time the J-spectrum after E-decay of 100 Sn, which …