Particle clustering and Mott transitions in hot nuclear matter at finite temperature: (III). Heavy cluster abundances and coulomb interaction

The properties of hot nuclear matter are calculated by considering the Coulomb interaction in a Debye-Thomas-Fermi approach. It is shown that the inclusion of the Coulomb forces implies a decrease of the cluster bound-state energy and a lowering of the nuclear density at the cluster surface. The Coulomb interaction together with consideration of the in-medium corrections leads to significant modification of the abundances of larger clusters compared with the frequently used law-of-mass-action approach.     

Bis(difluoroaluminum)organophosphonates and difluoroaluminumdiorganophosphinates

Oligomers and polymers of the general types [RR′P(O)OA1F₂]_n, I, and [F₂AlOP(R)(O)OAlF₂]_n, II, were prepared by the addition of phosphonic or phosphinic acids and hydrogen fluoride to etherated alanes. The hydrocarbon moieties (R,R′) on the phosphonic and phosphinic acids were important determinants of physical and chemical properties. When the alkyl moieties contained six or more carbon atoms type I oligomers were partially crystalline, soluble in tetrahydrofuran, and fused below 415°C. Type II polymers were soluble in tetrahydrofuran when n-octyl or larger alkyl moieties were used, but these polymers tended to be amorphous and liberated solvated tetrahydrofuran below 225°C. Data are presented in support of inter-monomer fluorine bridge bonding; that is, Al? F? Al bonds.     

Experimental evidence for the influence of the atomic shell structure on the energy loss of high energy heavy ions in matter

Secondary electron yield measurements for ²⁵²Cf fission products in carbon foils reveal significant deviations for the electronic stopping cross section from semiempirical predictions. This effect may correspond to the Z₁ oscillations observed previously at much lower ion velocities.