H. Uto

Transition radiation detector for relativistic particles at accelerator energies

Abstract Transition radiation (TR) has been investigated by using the arithmetic mean and the geometric mean of the pulses from 10 multiwire proportional chambers. The discrimination factor for different kinds of particles has been determined. Also the dependence of the intensity of TR on the Lorentz factor γ has been measured and compared with theoretical calculations.

Polarisation in the reaction π+p → K+Σ+ at 1.11 GeV

Abstract The polarisation of the recoil sigma in the reaction π + p → K + Σ + has been measured at 12 production angles at a beam momentum of 1.11 GeV /c using counters and spark chambers. The new data are compared with existing phase shift solutions of π p → K Σ channels in the low energy region.

A measurement of the charge asymmetry in the decay η → π+π−γ

Abstract An experiment has been carried out at the Rutherford Laboratory to look for a possible asymmetry in the eta decay to three pions. Eta mesons were produced in the process π − p → η n. The experiment produced 165311 decays η → π + π − π o from which we determined a value for the charge asymmetry A = (0.0028 ± 0.0026). We see no evidence for C -violation in this decay.

RELATIVISTIC PARTICLE SEPARATION BY MEANS OF TRANSITION RADIATION UTILIZING MULTIWIRE PROPORTIONAL CHAMBERS.

Abstract Investigations have been made on a transition radiation detection system consisting of a series of radiator-wire proportional chamber sandwiches and its feasibility for particle separation. A method for eliminating the “Landau” tail in the ionization distribution of a charged particle is described.

A test of the ΔI = 12 rule and the Lee-Sugawara relation in the decay σ+ → pπ0

Abstract The decay parameters α O and γ O have been determined for the decay σ + → pπ 0 by measuring the polarisation of the decay protons by scattering in an aluminium plate spark chamber. Assuming time reversal invariance and small final state interactions, analysis of 1259 useful scatters yielded α 0 = −0.96 +0.05 −0.035 and γ 0 = +0.28 +0.14 −0.18 .

Geometric mean computer and its use with transition radiation experiments

Abstract An analog device to compute a geometric mean value of independent signals from a large number of multiwire proportional chambers has been designed and operated. This device is useful in reducing the “Landau” tail in the ionization energy loss distribution of a charged particle and in separating different particles at very high energies.