Using the isospin-dependent quantum molecular dynamics model we study the isospin effects on the disappearance of flow for the reactions of 58 N i+ 58 N i and 58 F e+ 58 F e as a function of impact parameter. We found good agreement between our calculations and experimentally measured energy of vanishing flow at all colliding geometries. Our calculations reproduce the experimental data within 5%(10%) at central (peripheral) geometries.

We study the balance energy (E bal ) as a function of combined system mass for different colliding geometries, which range from central to semiperipheral ones. We find that E bal follows a power law behavior (∝A τ ) at all colliding geometries. We also study the effect of momentum dependent interactions on E bal as well as on its mass dependence. We find that the inclusion of momentum dependent interactions changes the value of τ drastically at peripheral geometries in agreement with other calculations.

Radiation from a perfectly conducting slotted sphere coated with a homogeneous material is investigated. It is found that for some values of the coating thickness certain modes become resonant, which greatly enhance the radiated power and affect the radiation field. The enhancement in the radiated power, however, depends on the loss tangent of the coating material and reduces rapidly as the loss tangent increases.

We present here the system size dependence of balance energy for semi-central and peripheral collisions using quantum molecular dynamics model. For this study, the reactions of N e 20 +N e 20 , Ca 40 +Ca 40 , N i 58 +N i 58 , N b 93 +N b 93 , Xe 131 +Xe 131 and Au 197 +Au 197 are simulated at different incident energies and impact parameters. A hard equation of state along with nucleon-nucleon cross-sections between 40 -55 mb explains the data nicely. Interestingly, balance energy follows a power law ∝ A τ for the mass dependence at all colliding geometries. The power factor τ is close to − 1 3 in central collisions whereas it is − 2 3 for peripheral collisions suggesting stronger system size dependence at peripheral geometries.This also suggests that in the absence of momentum dependent interactions, Coulomb's interaction plays an exceedingly significant role. These results are further analyzed for nuclear dynamics at the balance point.

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