Pion Production in the Neutron-proton Interaction PDF Download

Author: Taylan Akdoğan
Publisher:
ISBN:
Category :
Languages : en
Pages : 298

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Book Description
Triply differential cross sections for the reactions np --> np[pi]0 and np --> pp[pi]− have been measured at the WNR Facility of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. The measurements were made with a pulsed neutron beam with a continuous spectrum ranging from as low as a few MeV up to about 800 MeV, which covers the pion threshold energy of about 280 MeV and above, on a cryogenic liquid Hydrogen target. The two outgoing nucleons are detected in coincidence. Pure CsI crystals were used on one side of the beam (12,̊ 200,̊ 280)̊, whose pulse height information was used for energy determination of identified protons, and on the opposite side of the beam (12-̊ 32)̊, the neutrons or protons were observed in an array of organic scintillators with time of flight information. Measurement of'both nucleon energies, by the combination of the pulsed nature of the beam, times of flight and pulse height, completely determines the kinematics and allows the angular distribution of the unobserved pions to be extracted for both np --> np[pi]0 and np --> pp[pi]− actions.