Procedures are described for the purification of calf thymus nuclei using mild hypotonit shock to break intact cells, and layering techniques to remove cytoplasmic debris. Ficolc (a high polymer of sucrose) was dissolved in isotonic sucrose to give dense solutions suitable for gradient centrifugation. The method yields nuclei which can incorporate amino acids in vitro. Thymus nuclei isolated un...

Proteins and nucleic acids of nuclei of liver and hepatoma in the rat \vere separated into three fractions: Fraction I, soluble in 0.05 Msodium citrate; Fraction II, extracted with 1 M NaCl; and Fraction III, the residual fraction. Histones, acid-insoluble pro teins, RNA, and DNA were found in each fraction. Specific activities of the protein and nucleic acid fractions of nuclei of liver and a ...

The relativistic mean field theory is applied to study some exotic properties of neutron rich nuclei as recently observed, namely, extension of the drip-line for F nuclei from 29 F to 31 F and the appearence of a new shell closure at neutron number N = 16. We find 31 F to be bound against one-neutron dripping but unbound only marginally for two neutron separation. The calculated functional depe...

Nuclear reactions involving unstable nuclei play an important role in nucleosyn-thesis. Such reactions are mainly associated with explosive astrophysical scenarios occurring at the nal stages of stellar evolution. For many nuclear reactions involving unstable nuclei the direct reaction mechanism cannot be neglected and may even be the dominant reaction mechanism. For example, the direct{reactio...

In 1967, D. Wilkinson[1] suggested that in neutron rich nuclei, a few neutron might be loosely bound forming ”halos”. Though it was unclear what precisely was meant by this terms, in the ’80 the unusual result concerning the structures in longitudinal momentum distribution [2] in Li fragments from neutron rich Li led physicists[3] to consider the possibility of Li being one of these new “halo” ...

A new two-body interaction recently derived for nuclei in the 0flp shell by fitting two-body matrix elements to 494 energy levels in A = 41-66 nuclei, is used to investigate the neutron-rich nuclei in the vicinity of the doubly closed nuclide 48Ca. This study is of fundamental interest in providing a test for the new effective interaction away from the stability line. Masses and binding energie...

We demonstrate that nucleosynthesis in rapid, high-entropy expansions of proton-rich matter from high temperature and density can result in a wider variety of abundance patterns than heretofore appreciated. In particular, such expansions can produce iron-group nuclides, p-process nuclei, or even heavy, neutron-rich isotopes. Such diversity arises because the nucleosynthesis enters a little expl...

We study the role of light neutron-rich nuclei during r-process nucleosynthesis in supernovae. Most previous studies of the r-process have concentrated on the reaction flow of heavy unstable nuclei. Although the nuclear reaction network includes a few thousand heavy nuclei, only limited reaction flow through light-mass nuclei near the stability line has been used in those studies. However, in a...

For a better understanding of the dynamics of exotic nuclei it is of crucial importance to develop a practical microscopic theory easy to be applied to a wide range of masses. Theoretically the basic task consists in formulating an easy solvable theory able to reproduce structures and transitions of known nuclei which should be then used to calculate the sparely known properties of protonor neu...