U235Thermal Neutron Fission Yields at Masses 90 and 91

Cold-fission yields at effective excitation energies.

The experimental cold-fission yields for the systein 2 3 ' ~ ( n , h , f ) are analyzed as function of the effective total excitation energy (TXE). The nuclear level density effect is taken into account at higher TXE, in order to benefit by the lower experimental data uncertainty as well as to avoid the quantitative account of the level densities close to fragment ground states. In this way the...

Simultaneous measurement of the neutron capture and fission yields of 233 U

We have measured the neutron capture and fission cross section of 233U at the neutron time-of-flight facility n TOF at CERN in the energy range from 1 eV to 1 MeV with high accuracy by using a high performance 4π BaF2 Total Absorption Calorimeter (TAC) as a detection device. The method, based on the TAC energy response study, allowing to disentangle between γ’s originating from fission and capt...

Phd. Activity Report: Oct.90 -july 91

Masses and Deformations of Neutron-rich Nuclei

We have calculated the masses, deformations, and other properties of 8979 nuclei ranging from O to 136 and extending from the proton drip line to the neutron drip line on the basis of the 1992 version of the finite-range droplet model. The predicted quantities include the ground-state mass, deformation, microscopic correction, odd-proton and odd-neutron spins and parities, proton and neutron pa...

On the masses of neutron stars

We analyze the currently available observations of X-ray binaries in a consistent way, to re-determine the masses of the neutron stars in these systems. In particular, our attention is focussed on a realistic and consistent assessment of observational uncertainties and sources of systematic error. Confidence limits for these new mass estimates are generally less optimistic than previously assum...