Showing papers by "Birla Institute of Technology, Mesra published in 1977"
TL;DR: In this article, the velocities of the first and second sound and the structure factor for a system of interacting bosons were calculated and the two-body interatomic potential used was assumed to be composed of a hard core followed by a sum of both repulsive and attractive gaussians.
Abstract: We have calculated the velocities of the first and second sound and the structure factor for a system of interacting bosons. The two-body interatomic potential used is assumed to be composed of a hard core followed by a sum of both repulsive and attractive gaussians.
3 citations
TL;DR: In this article, the symmetry energy coefficientaT has been calculated in first order perturbation theory by two different methods: the method of Brueckner and Dabrowski, and the method given in this paper.
Abstract: The symmetry energy coefficientaT has been calculated in first order perturbation theory by two different methods. In one set of calculations we have used the method of Brueckner and Dabrowski, while in the other set we have made straightforward calculations of the energy of a neutron excess system in terms of the neutron excess parameterα. The isospin-spin dependent part of the single-particle potentialU1 has also been estimated using the explicit expression due to Brueckner and Dabrowski. Our results foraT andU1 compare favourably with those obtained by others, one result foraT being especially close to the empirical value.
2 citations
TL;DR: In this paper, the structure factor of a Bose fluid is calculated using an expression for S(k), which is approximately valid for all values of k. The results of the analysis are indirectly a theoretical justification for the existence of a second branch in Ek.
Abstract: The structure factor is calculated for a Bose fluid using an expression for S(k), which is approximately valid for all values of k. Marked fluctuations appear for k = 2.15 A -1 , near the roton dip in Ek, and at k = 3.65 A -1 near the dip in the second branch of Ek. Our calculations are indirectly a theoretical justification for the existence of a second branch in Ek. The results presented here agree fairly well with the experimental values for k >; 3.0 A -1 along with a dip at k = 3.67 A -1 which has not been reported earlier. It also suggests the existence of two waves, phonons and rotons, for k >; 3.0 A -1 .
2 citations