M. Warneke

Quasi-free scattering in proton-induced deuteron breakup at 585 and 800 MeV☆

Abstract Quasi-free scattering (QFS) has been observed in a kinematically complete p-d breakup experiment at 585 and 800 MeV. The reactions 2 H(p, 2p)n and 2 H(p, pn)p were investigated simultaneously for both symmetric and non-symmetric reaction kinematics. By employing a broad-range magnetic spectrometer, QFS was observed over a spectator momentum range from 0 to 350 MeV/ c . The spectator model with the Gartenhaus wave function describes the data well out to spectator momenta of ≈ 200 MeV/ c , above which point a significant discrepancy is observed.

Final state interactions in deuteron breakup by protons at 585 and 800 MeV

Abstract Neutron-proton final state interactions (FSI) were observed in the deuteron breakup reaction 2H(p, 2p)n-via a kinematically complete experiment at incident proton energies of 585 and 800 MeV. Kinematic conditions were chosen which allowed the final state proton and neutron to have small relative energies; data were taken at four proton c.m. scattering angles at 800 MeV, ranging from 71° to 119° and at 94° and 106° at 585 MeV. The data are analyzed in terms of the Goldberger-Watson formalism for final state interactions, and the individual contributions of the 1S0 and 3S1 np states are determined. The 3 S 1 1 S 0 ratio is large, as expected from some reaction models. The ratio of 3S1 (almost elastic) to pd elastic cross sections is in good agreement with FSI analysis.

Tune-up of the LAMPF high-energy pion channel

Abstract The LAMPF high-energy pion channel was tuned by tracing individual particles through the channel using multiwire proportional counters. Beam spot sizes, divergences, dispersions, and correlations between angle, displacement, and momentum were measured and optimized in an on-line least-squares search. The results are compared to predictions made by the TRANSPORT computer code, and it is found that the experimental results are in agreement with computer calculations.

Pion production on Li6 via the reaction 6Li(p,dπ+)He5 at Ep=800 MeV

The external proton beam of the Los Alamos Meson Physics Facility (LAMPF) was used to study π+ and π− production on light elements at 800 MeV incident proton energy. Although the Li6 nucleus is not the simplest nucleus to test various reaction mechanisms for pion production, the fact that it can be well represented by a two‐body system such as d‐He4, makes it possible to apply a similar general approach for study of three‐body nuclear reactions as in the case of pion production on hydrogen and deuterium.1,2

Pion production in p‐p interactions at 800 MeV

The production of pions in p‐p interactions was recently measured in a kinematically‐complete counter experiment at 800 MeV. Kinematic conditions were chosen to examine in detail several pion production mechanisms.

Pion production by 800 MeV protons from deuterium with a spectator neutron

Pion production induced by 800 MeV protons on deuterium has been investigated under conditions where the neutron in the deuteron target remains a spectator to the reaction. The cross section for this process is large and accounts for a large fraction of the total pion production in this kinematic region.

Kinematically-complete study of pion production by the reaction 1H(p, π+p)n at 800 MeV

Abstract The differential cross section d 5 σ/dp 1 dΩ 1 dΩ 2 has been measured in a kinematically-complete study of the reaction 1 H(p, π + p)n at 800 MeV, for several pairs of coplanar angles. The spectra at all observed angle pairs are dominated by the formation of the δ ++ isobar, with a tendency of forward peaking in the pion angular distribution.