Phenomenology of the deuteron electromagnetic form factors

A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm. This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data

Measurement of the n̄-Fe absorption cross section between 125 and 780 MeV/c

The n\u304-Fe absorption cross section sigma(nbarFe) has been measured at LEAR (the Low Energy Antiproton Ring at CERN) using tagged n\u304's produced in the p\u304p \u2192 n\u304n charge-exchange reaction. With incident p\u304 momenta of 875 and 545 MeV/c sigma(nbarFe) has been measured in the momentum interval between 125 and 780 MeV/c, in a region where only a few measurements presently exist. The overall statistical and systematic errors range from 20 to 5%; the normalisation error is less than 3%. The measured cross sections are well reproduced by a parametrisation a+b/p, with a = 0.680 \ub1 0.051 barn and b = 0.228 \ub1 0.024 barn\ub7GeV/c

A high-statistics measurement of the p̄p → n̄n charge-exchange reaction at 875 MeV/c

A new measurement of the differential cross section and of the analysing power A0n of the charge-exchange reaction p̄p → n̄n at 875 MeV/c is presented. The A0n data cover the entire angular range and constitute a considerable improvement over previously published data, both in the forward and in the backward hemisphere. The cross-section data cover only the backward region, but are unique at this energy. A careful study of the long-term drifts of the apparatus has allowed to fully exploit the good statistics of the data

Angular dependence of analyzing power in np elastic scattering between 0.312 GeV and 1.10 GeV

We present a total of 427 np analyzing power data points in a large angular interval at 12 energies between 0.312 and 1.10 GeV. The SATURNE II polarized beam of free monochromatic neutrons was scattered either on the Saclay frozen-spin polarized proton target or on CH2 and C targets. Present results are compared with existing elastic and quasieleastic data.</p