D.H. Fitzgerald

Cross-section measurements of p + d → 3He + π0 and p + d → 3H + π+ at intermediate energies

We present differential cross sections for p+ d → 3He + π0 at Tp = 300, 350, 400, 425, 450, 470 and 500 MeV, and for p + d → 3H + π+ at 500 MeV, mostly near θπ (c.m.) = 48° and 98°. The ratio dσ(pd → 3H π+)/dσ(pd → 3Heπ0) for identical four momentum transfer at 500 MeV is found to be 2.21 ± 0.17 to 2.57 ± 0.34, depending on angle. The dependence of the invariant matrix element squared |M|2 on the relativistic invariants t and s is examined; for a given value of t, |M|2 is almost independent of s for Tp between 350 and 800 MeV.

Measurement of Ann, Ano, and Aon for the Reaction Pp-]D-Pi+ in the Energy Region 500-800 Mev

Angular distributions of the spin observables A/sub n//sub n/, A/sub n//sub o/, and A/sub o//sub n/ for the reaction pp..-->..d..pi../sup +/ have been measured for pion c.m. angles 30/sup 0/

P3 beam measurements at LAMPF

Abstract The spatial distribution, composition and central beam momentum of 200–625 MeV/ c positive and negative beams in the LAMPF P 3 channel are described. The dependence of the electron contamination of the P 3 beam on the interaction point of the primary proton beam in the A2 production target is also given.

Measurement of A/sub n//sub n/, A/sub n//sub o/, and A/sub o//sub n/ for the reaction pp. -->. d. pi. /sup +/ in the energy region 500--800 MeV

Angular distributions of the spin observables A/sub n//sub n/, A/sub n//sub o/, and A/sub o//sub n/ for the reaction pp..-->..d..pi../sup +/ have been measured for pion c.m. angles 30/sup 0/

Measurement of A(nn), A(no), and A(on) for the Reaction

Angular distributions of the spin observables A/sub n//sub n/, A/sub n//sub o/, and A/sub o//sub n/ for the reaction pp..-->..d..pi../sup +/ have been measured for pion c.m. angles 30/sup 0/

P P \to D \pi^+

Angular distributions of the spin observables A/sub n//sub n/, A/sub n//sub o/, and A/sub o//sub n/ for the reaction pp..-->..d..pi../sup +/ have been measured for pion c.m. angles 30/sup 0/

in the Energy Region 500-{MeV} - 800-{MeV}

Abstract We have measured the detection efficiency of a large solid angle photon detector, using a tagged, monochromatic photon beam. The detector consists of a lead converter of thickness 1.7 radiation lengths, a multiwire proportional chamber and counters. Efficiencies were measured at eleven photon energies between 25 and 234 MeV/ c . The systematic uncertainties were minimized by measuring the photon tagging efficiencies using a large NaI counter. The overall uncertainties in the detection efficiencies are ⩽ 2%. We compare the results with values calculated for the efficiencies using the Stanford EGS Monte Carlo code. Agreement between the measured and calculated values is excellent.