Neutron-antineutron experiment at Los Alamos Omega West Reactor Page: 4 of 30
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arrangements except Grenoble, we have adopted a cylindrical arrangement
in which the detector surrounds a thin target.
The target is chin enough to transmit most of the neutrons and
gamma rays in the beam without intereaction. It is thick enough to
intercept the antineutrons in the beam and cause, with high probability,
To keep the gamma rays from the reactor from entering the sensi-
tive region of the detector, an elaborate baffle system has been de-
signed as shown in the foreshortened view of Figure 5.
The baffles are made of lead faced with 6 IF. The production of
capture gammas which are absorbed by 61.1 is reduced by a factor of
5 x 10-5. The lead absorbs gamma rays from the reactor which might
otherwise enter the sensitive region of the detector.
Gamma rays which traverse the target are stopped further down-
stream by a beam stop, lined with 6[LIF. The beam stop is far enough
down stream to keep the number oz backward moving gammas that might
enter the sensitive region of thv detector it tolerable levels.
The total intensity of gammas (ad neutrons) in the beam Is re-
duced by extending the length of the drift tube to 50 meters. This is
to be compared to 20-30 meters in other designs. Tic number of n R i
conversion is pioporttonal to the square of the drift length, 2
which compinsates the 0- loss in neut ron fluX.
We carried out a Monte Carlo calculation of the number of neutron
crossing the target and of the number of ganma rays entering the sensi
tive volume of the detector. This Is a 3-dimensional transport codle
available at Ion Al amos. The calculation included the effect of
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Anderson, H.L. Neutron-antineutron experiment at Los Alamos Omega West Reactor, article, January 1, 1982; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1056259/m1/4/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.