118 research outputs found
Determination of Gross Sections for the Production of 7Be, 10Be and 22Na by High-Energy Protons
Photonuclear Reactions of Three-Nucleon Systems
We discuss the available data for the differential and the total cross
section for the photodisintegration of He and H and the corresponding
inverse reactions below MeV by comparing with our calculations
using realistic interactions. The theoretical results agree within the
errorbars with the data for the total cross sections. Excellent agreement is
achieved for the angular distribution in case of He, whereas for H a
discrepancy between theory and experiment is found.Comment: 11 pages (twocolumn), 12 postscript figures included, uses psfig,
RevTe
Measurement of Small Volume Oceanic 14C Samples by Accelerator Mass Spectrometry
A technique for 14C measurement of small volume (0.5L) oceanic water samples by Accelerator Mass Spectrometry (AMS) is described. Samples were taken from a CTD/rosette system used for standard hydrographic work. After CO2 extraction and target preparation, the samples were measured at the Zürich tandem accelerator facility. On the basis of 14C data from samples collected on a station in the northern Weddell Sea, the precision of the measurements is estimated to ca ±8‰. The error in the present AMS results is dominated by the statistical error in 14C detection. From results of duplicate targets, it is concluded that a precision of ±5° can be reached. The 14C data are discussed in relation to the Weddell Sea hydrography
Electron and Photon Scattering on Three-Nucleon Bound States
A big spectrum of processes induced by real and virtual photons on the 3He
and 3H nuclei is theoretically investigated through many examples based on
nonrelativistic Faddeev calculations for bound and continuum states. The modern
nucleon-nucleon potential AV18 together with the three-nucleon force UrbanaIX
is used. The single nucleon current is augmented by explicit pi- and rho-like
two-body currents which fulfill the current continuity equation together with
the corresponding parts of the AV18 potential. We also employ the Siegert
theorem, which induces many-body contributions to the current operator. The
interplay of these different dynamical ingredients in the various
electromagnetic processes is studied and the theory is compared to the
experimental data. Overall we find fair to good agreement but also cases of
strong disagreement between theory and experiment, which calls for improved
dynamics. In several cases we refer the reader to the work of other groups and
compare their results with ours. In addition we list a number of predictions
for observables in different processes which would challenge this dynamical
scenario even more stringently and systematically.Comment: 154 pages, 80 figures includes as ps files, 21 additional figures as
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Untersuchung des Kernphotoeffektes an Be-9 und H-2 mit diskreten Gammaenergien zwischen 2,75 und 9,0 MeV
The Herdsman-Rose of Australia, with an Organ with the Gift of Speech, from book 4 of "From the Cradle to the Grave"
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