Abstract
Differential cross sections for neutrons elastically scattered from 11B have been measured for 85 incident neutron energies for 2.6 ≦ E n ≦ 8.0 MeV corresponding to excitation energies in 12B of 5.7 to 10.7 MeV. The cross sections were measured at nine laboratory angles per energy from 20° to 160° and show considerable resonance structure. These data, along with previously measured low-energy cross sections, have been analyzed for 0.1 ≦ E n ≦ 7.0 MeV with a multilevel-multichannel R-matrix program to make new assignments to states in 12B. The R-matrix calculation allows for change of l-value and for input in either j- j or L- S coupling schemes. A very good overall fit to the data is obtained over this wide range of excitation in 12B. Comparisons with existing theoretical work are discussed.
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