Abstract
Coherent neutron scattering lengths and free cross sections were measured for arsenic, for ordinary selenium and its isolated isotopes. By means of the Cristiansen filter technique the following scattering lengths for the bound atoms were obtained (in fm):b(As) =6.58(1) [b+=6.04(5) andb−=7.47(8)],b(Se)=7.970(9),b(76Se)=12.2(1),b(77Se) =08.25(8),b(78Se)=8.24(9),b(80Se)=7.48(3) andb(82Se)=6.34(8). Transmission measurements with neutrons of 1.26 eV and 5.19 eV resulted in an energy independent free scattering cross section for arsenic ofσs, t=5.40(3)b (in the eV-region).
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