Projectile-like fragments (PLF's) emitted in damped collisions of 15 MeV/u
20Ne ions with
197Au were observed in coincidence with two fission fragments. For given detection angles of the PLF's ...differential and energy-integrated fission probabilities were obtained and the average missing momentum vectors were deduced by using improved analysis methods of the fission fragment angular correlation. The average missing momentum vectors were found to point in the direction of the observed PLF, with a systematic deviation towards beam direction for larger mass transfers. The missing momentum thus appears to mainly originate from the sequential decay of the PLF's.
Acta Physica Polonica B Vol. 34, No. 5, May 2003, page 2791 An attempt is made to assess the significance of rotation in the
core-collapse supernova phenomenon, from both observational and ...theoretical
point of view. The data on supernovae particularly indicative of the role of
rotation in the collapse-triggered explosion is emphasized. The problem of
including the rotation of presupernova core into the supernova theory is
considered. A two-dimensional classification scheme of core-collapse supernovae
is proposed which unifies 'classical' supernovae of type Ib/c and type II,
'hypernovae' and some GRB events.
A simple procedure for evaluating the excitation energy and the spin transfer
in heavy-ion dissipative collisions is proposed. It is based on a prediction of
the GEMINI evaporation code : for a ...nucleus with a given excitation energy, the
average number of emitted protons decreases with increasing spin, whereas the
average number of alpha particles increases. Using that procedure for the
reaction 107Ag+58Ni at 52 MeV/nucleon, the excitation energy and spin of
quasi-projectiles have been evaluated. The results obtained in this way have
been compared with the predictions of a model describing the primary dynamic
stage of heavy-ion collisions.
An attempt is made to assess the significance of rotation in the core-collapse supernova phenomenon, from both observational and theoretical point of view. The data on supernovae particularly ...indicative of the role of rotation in the collapse-triggered explosion is emphasized. The problem of including the rotation of presupernova core into the supernova theory is considered. A two-dimensional classification scheme of core-collapse supernovae is proposed which unifies 'classical' supernovae of type Ib/c and type II, 'hypernovae' and some GRB events.
A simple procedure for evaluating the excitation energy and the spin transfer in heavy-ion dissipative collisions is proposed. It is based on a prediction of the GEMINI evaporation code : for a ...nucleus with a given excitation energy, the average number of emitted protons decreases with increasing spin, whereas the average number of alpha particles increases. Using that procedure for the reaction 107Ag+58Ni at 52 MeV/nucleon, the excitation energy and spin of quasi-projectiles have been evaluated. The results obtained in this way have been compared with the predictions of a model describing the primary dynamic stage of heavy-ion collisions.
In widely separated locations in both hemispheres, we have found a significant correlation between the increased concentrations of
210
Pb in glacier ice and periods of nuclear tests. The ...concentrations of
210
Pb fluctuated concurrently with
137
Cs concentrations in all glaciers studied, except for a temperate glacier in the Alps, exposed to the effects of summer heat. The most strict concurrence of fluctuation of these nuclides was observed in Spitsbergen, a location comparatively close to the arctic testing grounds. In 1973, a large excursion of
210
Pb concentration was observed in all glaciers studied south of the arctic, presumably after testing an advanced thermonuclear device at Lob Nor. The concurrence of concentrations of
210
Pb,
137
Cs, and
90
Sr was observed in samples of stratospheric aerosols collected at an altitude of 12 km. This indicates that a part of the
210
Pb present in the environment was produced, together with fission products, by nuclear explosions.
