Thomas Ypsilantis

Detection Efficiency of Plastic Scintillator for Neutron Energies 4 to 76 Mev

The neutron detection efficiency of plastic scintillator counters 15 cm thick has been determined for neutron energies from 4 to 76 Mev. Neutrons in this energy range were obtained by scattering a 205‐Mev neutron beam from a hydrogen target. A proton‐range telescope selected the forward‐scattered protons from the n‐p reaction, thus monitoring the flux of monoenergetic neutrons scattered in a prescribed direction. Near 10 Mev the efficiency is 30%, and it slowly decreases to 20% at 76 Mev.

Experiments on Nucleon-Nucleon Scattering with 280 MEV PolarizedProtons

4) is heam B C & . ~ @ P ~ t h e di ferrn:ial c r o s s sectior. f o r m b cnz2:1ietc2~ polrrice2 an ~ n p ~ f h ~

Polarization of High-Energy Protons in Elastic Scattering onHelium and Carbon

drg&. ( i ibis, i j ~ ~ i ~ p ~ n g ~ a ~ i ~ ~ j r 0 t t.ra-5-el iyi the e direction ~ r , nre polarize2 zloilp rhe 5 l computed from the rekkir?lr: T i i ~ u n t i t l - Po is q

OBSERVATION OF ANTIPROTONS

UNIVERSITY OF C ALIFORM A Radiation Laboratory Contract No, W-7405-eng-48 POLARIZATION OF HIGH-ENERGY PROTONS IN ELASTIC SCATTERING ON HEiluM AND CARBON Owen Chamberlain, Emilio Segre,, Robert Tripp, Clyde Wie-gandi, and Thomas Yp filanti a August 31, 1954 3erk«ley3, California