NUCLEAR STRUCTURE MEASUREMENTS WITH THE BROOKHAVEN COSMOTRON Page: 4 of 15
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would allows us to do elastic and inelastic scattering and (p,2p) measure-
ment at .1 BeV incident energy. In this project we were joined by groups
from Rice University, Maryland, and Los Alamos.
Figure 2 shows the experimental. setup. The beam exits from the
Cosmotron through the external shims, passes through a quadrupole triplet,
and is then bent 12 degrees to reduce the background created when the beam
passed through the Cosmotron exit window. A series of three bending magnets,
two on railroad tracks, is then used to change the angle at which the beam
strikes the target. The second quadrupole triplet, also on tracks, is used
to obtain the desired beam spot at the target. The distance from the shims
to the target is of the order of 100 feet. We have a fixed spectrometer
which is located at 20 degrees with respect to the zero degree beam line,
and a moving spectrometer which can be rotated between 50 and 90 degrees
with respect to the zero degree beam line. The magnet associated with this
spectrometer is on railroad tracks so it is easily moved. The scattering
angle into the fixed spectrometer can be varied from -5 degrees to 40 degrees.
Consequently the scattering angle of the second spectrometer can be varied
over the range 30 to 110 degrees. The angle between the two spectrometers
is variable between 70 and 110 degrees. To get the energy resolution and
the large solid angles required to do large momentum transfer measurements,
we are using a magnetic spectrometer in conjunction with wire spark chamber
hodoscopes as shown in Figure 3. SI and S2 are our trigger scintillation
counters. There are four horizontal hodoscopes before the magnets and four
after the magnets. In our high resolution work the bending angle is
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Friedes, J.L.; Palevsky, H.; Sutter, R.J.; Bennett, G.W.; Stearns, R.L.; Corley, D.M. et al. NUCLEAR STRUCTURE MEASUREMENTS WITH THE BROOKHAVEN COSMOTRON, report, February 1, 1966; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1025273/m1/4/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.