Neutron total cross sections on nuclei at Fermilab energies

Abstract

We have measured total cross sections for neutrons on protons, deuterium, beryllium, carbon, aluminum, iron, copper, cadmium, tungsten, lead, and uranium for momenta between 30 and 300 GeV/c. The measurements were carried out in a small-angle neutral beam at Fermilab. Typical accuracy of the data is 0.5 to 1%. The cross sections are consistent with an A 0"77+0"01 dependence over the entire momentum range. The cross sections are compared with theoretical predictions. Agreement is found only if inelastic screening is included. Nuclear radii obtained from our data are in good agreement with previous determinations. oT(Pn) would have been 0.9 mb larger. ** See, for example, Pumplin and Ross [27].

Total cross section measurements with π− , Σ− and protons on nuclei and nucleons around

“…Comparing our results with neutron-nucleus cross sections at 131 -273 GeV/c (data of [7]) shows that our measurements join the sequence of these data points. Averaging the neutron-beryllium total cross sections in this momentum range results in 271.0 ± 0.6 mbarn, which is close to our proton-beryllium cross section at 536 GeV/c of 268.6 ± 1.5 mbarn.…”

“…In the figures 7 and 8 we display a compilation of proton-nucleus and neutron-nucleus cross sections extracted from [7,[10][11][12] together with our results. As can be seen, the proton-nucleus cross sections of [5] that differences between neutron-nucleus and proton-nucleus cross sections are negligibly small above 20 GeV/c.…”

Gribov Inelastic Shadowing in the Dipole Representation

“…2. [8] for the total neutron-lead cross section. The dashed and solid curves correspond to the Glauber model and corrected for Gribov shadowing respectively.…”

Atomic and nuclear properties of materials

“…Experimentally well-established points are taken from Murthy et al ( 1 ) for H 2 , o 2 , Be, C, Al, Fe, Cu, W, Pb and U. To find cross-sections for atomic numbers that have not been measured two fits for interpolation are used: a) for elements heavier than Be the authors of Ref.…”

“…To find cross-sections for atomic numbers that have not been measured two fits for interpolation are used: a) for elements heavier than Be the authors of Ref. 1 give OT = 49.7 X A 0 · 77 , b) for all nuclei a parametrization is used, which is derived from a simple optical model assuming that the absorption is proportional to the length of nuclear matter transversed. One finds ( 2 ) 2 .…”