The differential cross sections of the 208Pb(d, p)2MPb transitions to the states 9/2% 5/2+, l /2+ , 7/2+, and 3/2+ in 209Pb were measured at 135° laboratory angle for deuteron energies between 7.0 and 10.5 MeV. The data below 8.0 MeV were analyzed in COULOMB Wave B O R N Approximation to give accurate spectroscopic factors of the five levels according to a simple shell model potential in the fi...

The narrow peak recently found in various pionic double charge exchange (DCX) cross sections can be explained by the assumption of a universal resonance at 2065 MeV, called d ′. We calculate the mass of a six-quark system with J P = 0 − , T = 0 quantum numbers employing a cluster model and a shell model basis to diagonalize the nonrelativistic quark model Hamiltonian.

When recent experimental positronium (Ps) formation cross sections in noble gases have been compared with the most up-to date theoretical studies, the agreement is qualitative, but not quantitative. In this paper we re-examine this process and show that at low energies Ps formation must be treated nonperturbatively. We also look at Ps formation with inner shell electrons.

The conventional view of the Ediacaran index fossil Cloudina, as proposed by Grant (1990), depicts the shell structure as a series of nested test tubes. A digital serial-reconstruction of Cloudina and examination of thin sections indicates that only the bottom-most tube has a bottom and that the shell wall structure is not as well defined as previously thought. The conventional ecological recon...

In this paper, we develop the quantum field theory of off-shell electromagnetism, and use it to calculate the Møller scattering cross-section. This calculation leads to qualitative deviations from the usual scattering cross-sections, which are, however, small effects, but may be visible at small angles near the forward direction.

The first experimental magnetic substate scattering-angle-integrated cross sections following ionization–excitation of He(1s) S to Heþ(2p) P in the e þHe collision system have been determined using a combination of total cross sections and polarization fraction measurements in the extreme ultraviolet range. The derived magnetic sublevel cross sections, r0 and r1, for ML 1⁄4 0, 1 have been studi...

Results from measurements of K-shell ionization cross sections of the elements Cr, Ni and Cu by electron impact with energies in the range 6.5–40 keV are presented. Cross sections were obtained by measuring characteristic x-rays emitted from (1–6 nm thick) films of the studied elements deposited on self-supporting carbon backing films. The procedure yields relative cross sections with uncertain...

Amphibian lampbrush chromosomes and meiotic prophase chromosomes of various insects and plants consist of a bundle of microfibrils about 500 A thick. These fibrils are double, being made of two closely associated fibrils 200 A thick. Fragments of interphase nuclei contain a mass of fibrils 200 A thick. Ultrathin sections through nuclei in prophase or interphase show sections of these double or ...