The PeV cosmogenic neutrino is still an interesting argument. Since cosmogenic neutrinos interact weakly with matter, the detection of their direction will precisely point out the source in the space. In this paper, we show the results of the simulation of tau lepton air showers induced by highenergy neutrinos detected by an array of stations designed to use the Earth Skimming method improved by the "mountain chain screen" strategy. Both track time stamp and position information of the stations on the array are used to reconstruct the shower to estimate the direction and the number of events. The studied array consists of 640 stations (40 × 16) spread over an area of 0.6 km 2 starting from 1500 m above the sea level (a.s.l.) on a 30 • inclined plane of the mountain. When we extrapolate to 3 years and 10 km 2 , we estimate 13 tau lepton events in an energy interval of 10 PeV to 1000 PeV detected using the present upper limits of tau neutrino flux.

We studied the charge radius, rms radius and neutron skin thickness ∆r np in even-even isotopes of Si, S, Ar and Ca and isotones of N =20, 28, 50 and 82. The ∆r np in doubly-magic 48 Ca, 68 Ni, 120,132 Sn and 208 Pb nuclei has also been calculated. Theoretical calculations are done with the Hartree-Fock-Bogoliubov theory with the effective Skyrme interactions. Calculated theoretical estimates are in good agreement with the recently available experimental data. The charge radii for Si, S, Ar and Ca isotopes is observed to be minimum at neutron number N =14. The theoretically computed results with UNEDF0 model parameterization of functional are reasonably reproducing the experimental data for ∆r np in 48 Ca, 68 Ni and 120,132 Sn. The energy density functional of UNEDF1 model provides much improved result of ∆r np for 208 Pb.

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