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Measurement of the threshold electrodisintegration of the deuteron
Abstract
The threshold electrodisintegration of the deuteron has been measured at momentum transfers of $Q\sp2$ = 8.7, 20.3, 31.3, 35.5, and 41.7 fm$\sp{-2},$ for electron beam energies of 347, 574, 750, 813, and 903 MeV at the MIT-Bates Linear Accelerator Center in April and May of 1990. The high momentum resolution of the ELSSY spectrometer ($\sim$10$\sp{-4}$ in $\Delta p/p$) and the relatively short usable liquid deuterium target length of 3.65 cm allowed a fairly good energy resolution ($\sim$2 MeV) to be achieved. This in turn made possible a reliable separation between the elastic scattering and inelastic scattering to the threshold for break-up of the deuteron at 2.23 MeV, and enabled a measurement of a threshold cross section averaged over an excitation energy of $E\sb{np}$ = 0-3 MeV. This cross section at high momentum transfer provides one of the best examples of the meson exchange currents associated with the short range N-N force. Various theoretical predictions show that the participation of the $\Delta$ resonance is also significant. However, the predictions are generally quite sensitive to the form factor of $\pi$NN vertices, since a complete dynamic theory for the internal structures of hadrons is still not available. At high momentum transfer relativistic effects are anticipated to be quite significant. In order that the threshold electrodisintegration of the deuteron can serve as a good example for the study of the short range N-N interaction, a full relativistic calculation may be required.
Subject Area
Nuclear physics
Recommended Citation
Lee, Kyong Sei, "Measurement of the threshold electrodisintegration of the deuteron" (1993). Doctoral Dissertations Available from Proquest. AAI9329638.
https://scholarworks.umass.edu/dissertations/AAI9329638