npelastic spin-transfer measurements at 485 and 635 MeV

Abstract

We have measured the spin-transfer parameters E~I., E~l., Al. p, and Egg at 635 MeV from 50' to 178' c.m. and at 485 MeV from 74' to 176' c.m. These new data have a significant impact on the phase-shift analyses. There are now sufticient data near these energies to overdetermine the elastic nucleon-nucleon amplitudes.PACS number(s): 21.30. +y, 13.75.Cs, 24.70.+s

np-elastic analyzing powerAN0and spin transferKNMcNaughton1, Johnston2, Swenson3 et al. 1993Phys. Rev. CSelf Cite21091View full textAdd to dashboardCite

“…[45]]. Both results were consistent with the calculated [46] background. The final corrections were 1% or less, with an uncertainty that was always negligible compared with counting statistics.…”

“…At backward angles, there are spin-transfer data measured with free neutrons on a liquid hydrogen target [44 -47]. Agreement is satisfactory between the recent LAMPF data [46] and the older TRIUMF data near 500…”

“…The only difFerences between this and previous experiments [45,46] were as follows: A superconducting solenoid was added to precess the neutrons to N spin, i.e. , normal to the scattering plane, and the vertical bend in the Scylla magnet was replaced by a horizontal bend in the Vartola magnet in order to avoid precession of the vertical proton spin.…”

“…The apparatus and experimental method used in the present measurements is essentially the same as was described previously [45,46]. Briefiy, the polarized-neutron beam was obtained from the LAMPF polarized-proton beam striking a liquid deuterium target from which the neutrons were collimated at zero degrees [39,40].…”

“…As in previous experiments [45,46], the background was measured both by interpolation under the momentum peak [see Fig. 2(a) of Ref.…”