In bombardments of Cm with "Ne we discovered two new isotopes, ' '106 and '""106, by establishing genetic links between their u decays and spontaneous fussion (SF) or u decays of the daughter nuclides. We measured E = 8.63~0.05 MeV for ' 106 and a half-life of 1.2 s for its daughter 6'104. For ' '106 we measured E = 8.71 to 8.91 MeV. From these n energies we estimated n half-lives of 10 -3Q s for ' 106 and 2 -3Q s for ' '106. We estimated SF branches of 50% or less for both isotopes. The decay properties of ' '106 establish the existence of enhanced nuclear stability near the predicted deformed shells N = 162 and Z = 108.PACS numbers: 21.10. Tg, 23.60.+e, 25.70.Gh, 27.90.+b Recent macroscopic-microscopic calculations (see, e. g.,

We measured the (n, 2n) cross sections for neutron energies from 13.7 to 15.1 MeV on 239 Pu and 241 Am by α-and γ -spectroscopy measurements of the post-irradiation 238 Pu/ 239 Pu and 240 Am/ 241 Am ratios relative to the (n, 2n) cross sections of 196 Au and other calibration reactions. Statistical errors on the measurements were not more than a few percent. Cross-section values ranged from 228 to 214 millibarns for the reaction on 239 Pu and from 260 to 222 millibarns for the 241 Am reaction for neutron energies from 13.7 to 15.1 MeV.

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We report the results of a study of the peak shapes in the gamma spectra measured using several 5 x 5 x 5 mm3 cadmium zinc telluride (CZT) detectors. A simple parameterization involving a Gaussian and an exponential low energy tail describes the peak shapes well. We present the variation of the parameters with gamma energy. This type of information is very useful in the analysis of complex gamma spectra consisting of many peaks.