3. DESCRIPTION OF PROBLEM OR FUNCTION
CRYSTAL-BALL is a program for determining neutron spectra from activation measurements and their associated errors.
A subsidiary program, XSTAPE, converts activation cross sections from the SAND-II data library into pointwise cross sections in a format that can be read by the main program. An energy grid consistent with the SAND-II grid (2) is used, however the subroutine specifying the energy spacings can be easily changed.
CRYSTAL-BALL itself uses the cross section data, together with an initial guess of the neutron spectrum to calculate the integral and differential spectrum and the corresponding reaction rates and monitor responses. An option to plot spectrum data using CALCOMP plotter routines is included.