THE SCATTERING OF POLARIZED NEUTRONS FROM STATICALLY POLARIZED SOLID HE-3

We have constructed a 0.4 mole solid He-3 target, cryogenically polari zed at 12 mK in a field of 7 T. The 0.04 atoms/b target reached a pola rization of 35% in 35 h, Such a target may be applied to any experimen t which is tolerant of the large ambient magnetic field and which prod uces target heating of less than a microwatt. High energy neutron and photon scattering experiments meet these requirements. The target's fi gure of merit for neutron transmission measurement exceeds that of pol arized gas targets by greater than 35, At the Triangle Universities Nu clear Laboratory we have used the target to measure the total cross se ction differences Delta sigma(T) and Delta sigma(L) for incident polar ized neutrons of energies 2-8 MeV, The cross section difference is sen sitive to the excited state structure of the n-He-3 system. The result s have been compared to a recent R-matrix analysis of A = 4 scattering and reaction data, and provide support for the He-4 level scheme deri ved from that analysis.