ABSTRACT
In order to study the nucleus-nucleus interaction in Pb-based cold fusion, we have measured excitation functions for quasielastic scattering of 48Ti, 54Cr, 56Fe, 64Ni, and 70Zn projectiles on a 208Pb target at backward angles. The barrier distributions were derived from the first derivative of measured quasielastic scattering cross sections relative to the Rutherford scattering cross section. The centroids of the barrier distributions show a deviation from several predicted barrier heights toward the low energy side. The shape of the barrier distributions is well reproduced by the results of a coupled-channel calculation taking account of the coupling effects of two phonon excitations of the quadrupole vibration for the projectiles and of the octupole vibration for the 208Pb target.
ABSTRACT
Evaporation residue cross sections in the 16O+238U reaction were measured for the energy range from above- to extreme sub-barrier. The cross sections are reproduced by a statistical model calculation, for which partial cross sections are calculated by a coupled-channel model taking into account the prolate deformation of 238U. Complete fusion was observed in the collision of the projectile with the tips of the 238U target, in the same way as the side collision.
ABSTRACT
UDP-glucuronosyltransferase activities were induced spontaneously during the development of hepatitis in LEC (Long Evans Cinnamon-like coat color) rats. Transition of hepatic microsomal UDP-glucuronosyltransferase activities was observed during the development of the LEC rat, which displayed spontaneous fulminant hepatitis with severe jaundice at about 12-16 weeks after birth. UDP-glucuronosyltransferase activities toward various substrates in 8-week-old LEC and LEA (Long Evans Agouti coat color; control) rats were similar. After 8 weeks of age, the transferase activities of LEA rats towards all substrates tested, except for bilirubin, decreased slightly during the next 24 weeks. In LEC rats, the transferase activities towards serotonin and several phenolic xenobiotics, such as 4-nitrophenol, 1-naphthol and 4-methylumbelliferone, but not 4-hydroxybiphenyl, increased about 2-fold at 16 weeks of age. During the 24 weeks following the first 8 weeks of age, the high level activities towards the xenobiotics continued, with the exception of bilirubin transferase activity which decreased gradually. These results suggest that a form of UDP-glucuronosyltransferase, which catalyzes the glucuronidations of serotonin and these xenobiotics except for 4-hydroxybiphenyl, is induced during the development of hepatitis in the LEC rat.