of the heavy nucleus are of high energy and sharp [calibration?] in laboratory system due to Lorentz transformation.
[Average? Air?] energy in rest system ~2 to 3 Mev / nucleon
(Perkins)
They say residual nucleus continues with undiminished velocity, emitting evaporation alpha's.
therefore, Energy and angular distribution of alpha's give an estimate of velocity of parent nucleus. For alpha's emitted isotropically in the set system of incident nucleus, root mean square angle which the slower particles make in lab system
<(theta exponent 2)> = ((<[tau?]> M)/(3(p exponent 2)))
<[tau?]> average kinetic energy of alpha-particles [Sn? Sr? delta n? delta r?] root system.
M proton mass
p momentum per nucleon of the incident particle
By Perkins [lab?] <[tau?]> = 10 Mev
(square root of <(theta exponent 2)>) = (0.056/E)
E total energy per nucleon of the incident particle in Bev.

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of the heavy nucleus are of high energy and sharp [calibration?] in laboratory system due to Lorentz transformation.
[Average? Air?] energy in rest system ~2 to 3 Mev / nucleon
(Perkins)
They say residual nucleus continues with undiminished velocity, emitting evaporation alpha's.
therefore, Energy and angular distribution of alpha's give an estimate of velocity of parent nucleus. For alpha's emitted isotropically in the set system of incident nucleus, root mean square angle which the slower particles make in lab system
<(theta exponent 2)> = ((<[tau?]> M)/(3(p exponent 2)))
<[tau?]> average kinetic energy of alpha-particles [Sn? Sr? delta n? delta r?] root system.
M proton mass
p momentum per nucleon of the incident particle
By Perkins [lab?] <[tau?]> = 10 Mev
(square root of <(theta exponent 2)>) = (0.056/E)
E total energy per nucleon of the incident particle in Bev.