Forward Differential Cross Sections for the Reaction in the Range
- 1 April 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 3 (7) , 1536-1556
- https://doi.org/10.1103/physrevd.3.1536
Abstract
A missing-mass spectrometer, employing optical spark chambers with automatic vidicon readout, was used to measure the forward differential cross section () for the reaction at closely spaced settings of the incident proton momentum in the range . The deuterons from the reaction were identified by time of flight, and their momentum and angle of emission measured by a reconstruction of the spark-chamber tracks. Since the incoming proton momentum was accurately known, the missing mass associated with deuteron production could be deduced. The reaction was identified by the appearance of a distinct peak corresponding to the pion mass in a missing-mass plot. The data confirm the existence of a prominent peak in the forward cross section at GeV and show a hitherto unreported shoulder at GeV. This structure, along with the well-known sharp maximum at GeV, may be understood on the basis of a one-pion-exchange model as reflecting the behavior of the isobars in pion-nucleon scattering. Above GeV, the forward differential cross section decreases monotonically as the -2.5 power of , the square of the total c.m. energy. This feature also reflects the behavior of the scattering cross section. The structureless upper-energy region can also be accommodated within the framework of Regge theory. The cross section extrapolated to varies as the -3.2 power of , midway between that expected for the and trajectories.
Keywords
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