312
E. Blain et al.
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
Y
exp
56 Fe
ENDF/B-7.1
Y
exp
56 Fe
JEFF-3.3
Y
exp
Energy [keV]
56 Fe
ENDF/B-8.0
Fig. 1 A comparison of the experimental capture yield found using the RPI mid-energy capture
detector with the ENDF 7.1, JEFF 3.3, and ENDF 8.0 evaluation. The ENDF 7.1 is shown to be
higher than the experimental yield and JEFF 3.3 is lower; however, the new evaluation from ENDF
8.0 which utilizes the data is in much better agreement
evaluations, and the new ENDF 8.0 evaluation which uses the IAEA evaluation. This
shows that the data provided from this measurement were helpful in constraining the
new evaluation of 56 Fe. Further information on this measurement can be found in
the following reference [6].
4 Fission Measurements
Fission measurements investigating aspects of the resonance region have previously
been performed at RPI utilizing the Lead Slowing Down Spectrometer (LSDS).
The LSDS is a 1.8 m cube of high purity lead which incorporates the high neutron
scattering and low absorption cross section of lead to increase the neutron flux
locally within the cube. This allows for neutron fluxes several orders of magnitude
higher than traditional ToF measurements. The fission measurements use a double
Frisch gridded ionization chamber to measure the fission fragment mass and charge
distribution as a function of neutron ToF. The LSDS uses a modified ToF equation
which takes into account the slowing down spectrum of the neutrons in the lead
and can be seen below in Eq. (1) where k = 165,000 eV μs, E is in eV, and
E. Blain et al.
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
600 800 1000 1200 1400 1600 1800 2000
0.000
0.001
0.002
Y
exp
56 Fe
ENDF/B-7.1
Y
exp
56 Fe
JEFF-3.3
Y
exp
Energy [keV]
56 Fe
ENDF/B-8.0
Fig. 1 A comparison of the experimental capture yield found using the RPI mid-energy capture
detector with the ENDF 7.1, JEFF 3.3, and ENDF 8.0 evaluation. The ENDF 7.1 is shown to be
higher than the experimental yield and JEFF 3.3 is lower; however, the new evaluation from ENDF
8.0 which utilizes the data is in much better agreement
evaluations, and the new ENDF 8.0 evaluation which uses the IAEA evaluation. This
shows that the data provided from this measurement were helpful in constraining the
new evaluation of 56 Fe. Further information on this measurement can be found in
the following reference [6].
4 Fission Measurements
Fission measurements investigating aspects of the resonance region have previously
been performed at RPI utilizing the Lead Slowing Down Spectrometer (LSDS).
The LSDS is a 1.8 m cube of high purity lead which incorporates the high neutron
scattering and low absorption cross section of lead to increase the neutron flux
locally within the cube. This allows for neutron fluxes several orders of magnitude
higher than traditional ToF measurements. The fission measurements use a double
Frisch gridded ionization chamber to measure the fission fragment mass and charge
distribution as a function of neutron ToF. The LSDS uses a modified ToF equation
which takes into account the slowing down spectrum of the neutrons in the lead
and can be seen below in Eq. (1) where k = 165,000 eV μs, E is in eV, and