FIZIKA B 8 (1999) 1, 165-180

size = 345 kBsize = 1431 kB

FINE TUNE OF N-N FORCE, LOW ENERGY p - d AND n - d ELASTIC SCATTERING OBSERVABLES AND THE COULOMB SLOW-DOWN EFFECT

BRANISLAV VLAHOVI∆ AND ANGELAURELIO  SOLDI

North Carolina Central University, Durham, N.C. 27707, U. S. A.

Received 12 April 1999;Accepted 12 July 1999

We examine the differences between n-d and p-d analysing power in elastic scattering at energies below 25 MeV and investigate whether these differences can be understood as the result of charge-symmetry breaking in the 3PJ states. We show that a correction of the data to account for the slowing down of the proton under the Coulomb force does not account for these differences. The differences can be explained by introducing 3 to 4 % charge symmetry breaking in the 3PJ states of the Bonn potential. We give the explicit values of the parameters setting the strength of the NN force in 3Pj states for n-n, n-p and p-p forces. Such modified Bonn potential gives simultaneously good agreement for both 2N scattering data and the 3N observables.

PACS numbers: 21.30.+y, 13.75.Cs
UDC 539.125, 539.128

Keywords: charge-symmetry breaking, 3PJ states, elastic scattering below 25 MeV, n-d and p-d analysing power, proton slowing down effect, Bonn potential

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