Mikroskopski model za računanje početnog broja ekscitona u sudarima atomskih jezgara

A microscopic model for estimating n0, the initial exciton number used in calculating pre-equilibrium emission from heavy-ion reactions, is presented. The model follows the evolution of the geometrical and phase spaces during the process of fusioning of the target and the projectile. A good agreement is found between the calculated values of n0 and the empirical values extracted from fits to nucleon spectra; empirical trends of physical quantities involving n0 are reproduced. An approximate expression for calculating n0 as a function of the mass and energy of the colliding system is given.Prikazan je model pomoću kojeg je moguce odrediti n0, početni broj eksciton a na koji se dijeli energija sudara atomskih jezgara. Taj je parametar potreban za računanje predravnotežne emisije čestica iz teskoionskih reakcija. Prikazani model slijedi evoluciju geometrijskog faznog prostora tijekom procesa fuzije jezgre mete i projektila. Dobro slaganje opaženo je između računatih vrijednosti parametara n0 i onih, dobivenih na empirički način analizom nukleonskih spektara iz teškoionskih reakcija. Model također uspješno reproducira trendove fizikalnih veličina povezanih s n 0 . U članku je dan izraz za računanje približne vrijednosti parametra n 0 u ovisnosti o masi i energiji sudarnog sustava

Mikroskopski model za računanje početnog broja ekscitona u sudarima atomskih jezgara

A microscopic model for estimating n0, the initial exciton number used in calculating pre-equilibrium emission from heavy-ion reactions, is presented. The model follows the evolution of the geometrical and phase spaces during the process of fusioning of the target and the projectile. A good agreement is found between the calculated values of n0 and the empirical values extracted from fits to nucleon spectra; empirical trends of physical quantities involving n0 are reproduced. An approximate expression for calculating n0 as a function of the mass and energy of the colliding system is given.Prikazan je model pomoću kojeg je moguce odrediti n0, početni broj eksciton a na koji se dijeli energija sudara atomskih jezgara. Taj je parametar potreban za računanje predravnotežne emisije čestica iz teskoionskih reakcija. Prikazani model slijedi evoluciju geometrijskog faznog prostora tijekom procesa fuzije jezgre mete i projektila. Dobro slaganje opaženo je između računatih vrijednosti parametara n0 i onih, dobivenih na empirički način analizom nukleonskih spektara iz teškoionskih reakcija. Model također uspješno reproducira trendove fizikalnih veličina povezanih s n 0 . U članku je dan izraz za računanje približne vrijednosti parametra n 0 u ovisnosti o masi i energiji sudarnog sustava

Discoveries and Other Information in Physics and Astronomy of the Last Decade, which Have a Potential to Influence our View on the Universe

In the last decade, natural sciences (sometimes called exact sciences) have nearly every week brought some discoveries or important news, which have consequences on our understanding of the world and the whole Universe, its past and future, and which may stimulate possible new philosophical look at the world and human beings in it. We have selected several such cases and will try to present them to colleagues working outside the natural sciences to serve as motives for their work: i) Water, the basic liquid for our life, seems to be much more abundant (though not in clear form without ingredients) on and inside the Earth and in the Universe than was assumed still a decade ago. What does it mean and which are the consequences for us? ii) Is our Earth the only place of intelligent life in the Universe or not? What do both these possibilities mean for us, for philosophy, ethics and theology? iii) Nature is full of various surprises, which may come as a disaster in a global scale. Are we prepared to cope with them