1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
- 156 -<br />
Some modifications concerning the sample geometry<br />
have been made.<br />
4.2.2. Calculations Concerning the Differential Cross Section<br />
for Elastic Neutron Scattering<br />
Two PORTEAN IV programs, BLATT-4 and ERRFIT, have been<br />
written. BLATT-4 performs a least squares fit of the<br />
Blatt and Biedenharn single level formula for the<br />
differential elastic scattering cross section. ERRFIT<br />
computes the error on the theoretical differential<br />
cross section calculated with resonance parameters<br />
obtained from BLATT-4 [25].<br />
The program ELIESE-1 (JAERI-1096) has been modified<br />
in order to be used in a least squares method to fit<br />
the differential elastic neutron scattering cross<br />
section by means of optical model and Hauser-Feshbach<br />
calculations. The program is being tested.<br />
4.2.3. Multiple Scattering Corrections for Elastic and<br />
Inelastic Neutron Scattering Cross Section <strong>Data</strong><br />
Detailed tests of the programs MAGGIE and MOULD<br />
(Aldermaston) have been made. Several errors in<br />
MAGGIE concerning the score calculations have been<br />
corrected. MAGGIE has been completed by a subroutine<br />
which performs the correction of the measured inelastic<br />
neutron peaks for contamination by multiple<br />
elastic scatter. The iteration routine for the shape<br />
correction of measured elastic angular distribution<br />
has been extended to include the inelastic case. Calculations<br />
of flux attenuation factors, shape corrections<br />
for elastic and inelastic angular distributions,<br />
and special score calculations have been performed<br />
for Si (4.00 - 5.74 MeV) Polythene (4.00 - 4.78 MeV),<br />
and 7 Li (1.10 - 2.30 MeV).