[en] The authors present here the binding energies and mass excesses of 7208 nuclei in the ranges 4 le Z le 120 and 8 le A le 270. Relative to the 1986--1987 mass table, the present results are obtained with the recently improved infinite nuclear matter model which has the desirable features of natural decoupling of the infinite part from the finite part of the ground state energy, together with the cancellation of the exchange Coulomb, finite-size proton form factor, and Noeln-Schiffer anomaly terms. In addition, the authors have developed a new scheme of an interactive network covering the entire nuclear chart to obtain the local energy (comprising shell, deformation, etc.) of a nucleus in a consistent manner, using the technique of ensemble averaging of a large number of values predicted with the help of recursion relations derived in the model. This has widened the scope for predictions of masses of nuclei far into the drip-line regions of the nuclear chart. On the basis of systematics of the two-neutron separation energies, several new islands of stability in the exotic regions are predicted. This model has only five parameters representing the properties of infinite nuclear matter, the surface tension, and the Coulomb and pairing terms, which are determined once and for all in least-squares fits to known nuclear masses. The root-mean-square deviation of the fit to 1884 known masses is 401 keV, while the mean deviation is a remarkably low 9 keV, indicating the remnant systematic effects are vanishingly small

[en] Within the framework of the ETFSI (extended Thomas-Fermi plus Strutinsky integral) mass formula, a precision fit of nuclear masses with Skyrme forces, subject to the constraint that neutron matter does not collapse at nuclear or subnuclear densities, is possible if, but only if, the nuclear-matter symmetry coefficient J lies close to 28 MeV

[en] The recently developed Infinite Nuclear Matter (INM) model of atomic nuclei would be worth using, as the local energy systematics derived from the model could be very well utilized for the purpose. The INM model recognizes three distinct features of nuclei, namely, the nuclear matter part, the universal finite-size part and the characteristic local energy part. The present study is aimed to identify similar characteristic features associated with the local energy systematics for the normally deformed nuclei and then use these systematics to predict the unknown islands of deformation through out the nuclear chart

[en] A classical model using frictional forces is presented to describe the deep inelastic collision phenomena. Taking spheroidal deformation as a dynamical degree of freedom and frictional force proportional to the rate of change of separation between the two surfaces, the relevant equations of motion are obtained. The folding potential as a function of internuclear separation distance and deformation are generated for Ar+Th and Xe+Bi system. In case of Ar+Th system at 379 MeV, the energy loss which was not properly accounted for in previous model calculation, is now satisfactorily explained. It is worth mentioning here that previously Wilczynski and J.N. De have not improved energy loss by introducing deformation in the exit channel in a phenomenological manner. For Xe+Bi system at 1130 MeV, the present model predicts the absence of fusion in conformity with experiment. Such feature was not accountable previously. (author)

[en] The use of Leptodermous Expansion (LDE) technique for the study of ground state properties of nuclei has been going on for the last few decades. Here in the present talk the origin and development of this technique will be reviewed with particular emphasis on how and why this has been applied in nuclear physics in understanding various physical properties of nuclei like binding energy, density distribution, size, shape and radii, and also deformation properties etc. The relevant techniques, their shortcomings and eventual improvements for understanding these properties in the above model will be discussed. Particular reference will be made as to how this LDE technique can be used to obtain finite nucleus incompressibility in terms of an analytical expression involving standard parameters of the nucleus. This expansion involves certain coefficients whose method of calculation will be discussed. This indirectly helps in determining the nuclear matter incompressibility whose value still remains undetermined to a precise extent. Results obtained in this regard in the context of the present model will be finally discussed and compared with those available in other methods. (author). 14 refs., 2 figs., 1 tab

[en] The general Hartree-Fock (HF) formalism with density-dependent effective interactions is reviewed. Salient features and techniques required to deal with density dependent interactions are discussed. This formalism is then applied to the study of the extreme neutron-rich nuclei lying in the region far away from β-stability valley. Results of the calculations carried out in this regard both by the present author and by others are presented. (author). 15 refs., 2 tabs

[en] It is well known that, the ground state properties of nuclei lying in the β-stable valley, exhibit characteristic irregularities in the midst of smooth behaviour at specific neutron and/or proton numbers, otherwise known as magic numbers. An attempt has been made to get the answer using the mass predictions of the recently improved Infinite Nuclear Matter (INM)

[en] We present mass excesses of 3481 nuclei in the range 18≤A≤267 using the infinite nuclear matter model based on the Hugenholtz-Van Hove theorem. In this model the ground-state energy of a nucleus of asymmetry β is considered equivalent to the energy of a perfect sphere made up of the infinite nuclear matter of the same asymmetry plus the residual energy due to shell effects, deformation, etc., called the local energy eta. In this model there are two kinds of parameters: global and local. The five global parameters characterizing the properties of the above sphere are determined by fitting the mass of all nuclei (756) in the recent mass table of Wapstra et al. having error bar less than 30 keV. The local parameters are determined for 25 regions each spanning 8 or 10 A values. The total number of parameters including the five global ones is 238. The root-mean-square deviation for the calculated masses from experiment is 397 keV for the 1572 nuclei used in the least-squares fit. copyright 1988 Academic Press, Inc

[en] The ground-state masses of 3481 nuclei in the range 18≤A≤267 have been calculated using the inifinite nuclear matter model based on the generalised Hugenholtz-Van Hove theorem. In this model there are two kinds of parameters: Global and local. The five global parameters which characterise the properties of the sphere made up of inifinite nuclear matter are determined once for all by fitting the masses of all nuclei (756) in the recent mass table with error bar less than 30 keV. The local parameters are determined for 25 regions defined by ΔA = 8 or 10. The r.m.s. deviation for the calculated masses from the experiment is 397 keV for the 1572 nuclei used in the least square fit. Sample results on Na isotopes and other recently measured masses have been given. The derived saturation properties of nuclear matter have been discussed

[en] The original three-body term in the Skyrme interaction is replaced by a two-body explicit density dependent term to reproduce simultaneously the excited and ground states of nuclei. Care has been taken to remove the spin instability of the Hartree-Fock ground state in nuclear matter and also the antipairing nature of the interaction inherent in the original Skyrme interaction. The spin-isospin dependent parameter introduced in the density dependent term is determined from the average asymmetry ratio and asymmetry energy. The modified Skyrme force is used to calculate the low-lying states of ¹⁸O, ¹⁸F, ⁴²Ca, ⁴²Sc, and ¹⁶O, ⁴⁰Ca. In the light of these calculations the relative importance of the different Skyrme variants is studied