he
Initial Rate of Neutron Multiplication
It is possible to calclate in advance of a test a reasonable value
of alpha, It is not possible at the present state cf the art to calculate
the efficiency from a value of alpha, Hence if we measure alpha and
efficiency for a number of different bomb designs, we will supply an
experimental method to partially offset this defect in theory, It is
clear that efficiency will depend on other parameters than alpha so that
this measurement is not a complete solution of the problem bit is a help
to the theory.
Determine if the particular bomb fired resulted in a partial fizzle
or an accidental large explosion.
Without this knowledge a serious error
in judgement of the acceptability of a given model might result,
(a)
The "Rossi" method.
(bo)
The “Teller” method,
to be trustworthy,
This is a method previously tried and believed
This is an as yet untried method which should be
compared with the Rossi method, If it is found to be satisfactory,
it could be the only method used in subsequent tests. The
instrumentation and techniques are appreciably simpler for the
Teller method,
De
Transit Time
Determination of informaticn complementary to that given by the
neutron multiplication rate measurement for aid in deciding whether or not
the particular bomb detonated was normal for that type.
6.
Gamma-ray Spectrum
Determination of the spectral distribution and intensity of
especially the very hard gamma rays for considerations of their lethal
effects and to increase:our understanding of the fundamental processes
involved in the nuclear explosion,
There is some question vhether or
not identical radiation can ‘be produced in the laboratory.
7.
High Energy Neutron Measurements
Determination of the high energy neutron spectral distribution at
various distances from the bomb to aid in estimating the biological
effects of atomic bombs,
Determination of the background intensity of very high energy
neutrons as a control measurement for an experiment proposed for a future
test, which experiment would be designed to determine the feasibility of
an entirely new principle for atomic weapons,
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