Behaviour of the EAS Age Parameter in the Knee Energy Region

Analyzing simulated EAS events generated with the CORSIKA code, the characteristics of lateral distribution of electrons in EAS around the knee energy region of the primary energy spectrum have been studied and compared with experimental observations. The differences between the EGS4 and the NKG output of CORSIKA in respect to electron radial density distribution have been investigated. The relation between lateral and longitudinal age parameters has been studied after introducing the notion of the local age parameter that reflects the profile of the lateral distribution of electrons in EAS. The present analysis motivates the inclusion of the lateral shower age in a multiparameter study of EAS to extract information on hadronic interactions and primary composition.Comment: Talk presented at XVI International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2010), Batavia, IL, USA (28 June - 2 July 2010). 4 pages, 5 figure

Mean field baryon magnetic moments and sumrules

New developments have spurred interest in magnetic moments ($\mu$-s) of baryons. The measurement of some of the decuplet $\mu$-s and the findings of new sumrules from various methods are partly responsible for this renewed interest. Our model, inspired by large colour approximation, is a relativistic self consistent mean field description with a modified Richardson potential and is used to describe the $\mu$-s and masses of all baryons with up (u), down (d) and strange (s) quarks. We have also checked the validity of the Franklin sumrule (referred to as CGSR in the literature) and sumrules of Luty, March-Russell and White. We found that our result for sumrules matches better with experiment than the non-relativistic quark model prediction. We have also seen that quark magnetic moments depend on the baryon in which they belong while the naive quark model expects them to be constant.Comment: 7 pages, no figure, uses epl.cl

Magnetska svojstva monokristala bizmuta punjenih galijem i indijem

Diamagnetic susceptibility in single crystals of bismuth doped with gallium and indium has been measured as a function of temperature between 100 and 300 K. Susceptibility decreases with the increase of temperature for each of the samples and also with the increase of the percentage of impurity. An attempt has been made to explain properly the observed phenomena on the basis of the large diamagnetism exhibited by valence electrons.Mjerili smo dijamagnetsku susceptibilnost monokristala bizmuta punjenih galijem i indijem u ovisnosti o temperaturi između 100 i 300 K. Susceptibilnost se smanjuje s povećanjem temperature i povećanjem punjenja za sve uzorke. Predlažemo tumačenje postignutih ishoda mjerenja na osnovi jakog dijamagnetizma koji pokazuju valentni elektroni

A note on matrix model with IR cutoff and AdS/CFT

We propose an effective model of strongly coupled gauge theory at finite temperature on $R^3$ in the presence of an infrared cutoff. It is constructed by considering the theory on $S^3$ with an infrared cutoff and then taking the size of the $S^3$ to infinity while keeping the cutoff fixed. This model reproduces various qualitative features expected from its gravity dual.Comment: 27 pages, 9 figures, an appendix added, other minor changes, journal versio

Magnetska svojstva monokristala bizmuta punjenih galijem i indijem

Diamagnetic susceptibility in single crystals of bismuth doped with gallium and indium has been measured as a function of temperature between 100 and 300 K. Susceptibility decreases with the increase of temperature for each of the samples and also with the increase of the percentage of impurity. An attempt has been made to explain properly the observed phenomena on the basis of the large diamagnetism exhibited by valence electrons.Mjerili smo dijamagnetsku susceptibilnost monokristala bizmuta punjenih galijem i indijem u ovisnosti o temperaturi između 100 i 300 K. Susceptibilnost se smanjuje s povećanjem temperature i povećanjem punjenja za sve uzorke. Predlažemo tumačenje postignutih ishoda mjerenja na osnovi jakog dijamagnetizma koji pokazuju valentni elektroni

Radiating spherical collapse with heat flow

We present here a simple model of radiative gravitational collapse with radial heat flux which describes qualitatively the stages close to the formation of a superdense cold star. Starting with a static general solution for a cold star, the model can generate solutions for the earlier evolutionary stages. The temporal evolution of the model is specified by solving the junction conditions appropriate for radiating gravitational collapse.Comment: 13 pages, including 3 figures, submitted to IJMP-