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- lnteraction of Neutrons lyith S{atter
, .l
Probleml.
'fwo beams of l-ev
neutrons intersect at an angle of g0". The rJensity
of neutrons in
both beams is 2xlOrln/cm3.
.
a) Calculate the intensity of each beam. :
,
, ,
b) what is the neutron flux where trre bcanrs intersect?
t,
.
Problem 2.
A monoencrgctic bcam oI ttctrtrons- 4-x,1,1)t0 n/(s cur2). impingcs
on a target I cm2 in
area and 0'l ctn thick. fltcrc l'c 0.048xlOrt at.nrs
p*r'.,n1'inir1.'l*e" ij rrr" total
cross-section at the energy of the beanr is 4.5 b"
I
a) What is the nracroscopic cross-section? ,, r
ilii:
:
b] fg* llany neutron inieracti.ns per second occnr'in t-he t*'bYr'
c) What is the collision den.sity lcoilision rate)? --- :-- -arget?
Problern 3.
The I entitter ]tat 6]*tr'tife 2.3 min) can he proclucecl by the raclioactive capture of , ,
neutronsby28Al.r.neo.ozs:-"V.,o,,-,ection1brjtlrisreactionis0.23b.Supposethata..
small,0.0l-g aluminurn targer is'placed in a beam
3;jtF;i;;X
"ro.ozi:-rv n",,r*i
rvhich strikes the entire target. Calculate:
a) The neutron rlensity in lhc bcam:
which ttAl is produced.
*1r,
b) The
Problem 4.
A beam of 2-l\'tcv neutrons is inciclerit on a.slah.ofJreavy.,r,r,';rter
(D2o). TSe,totat;;:_!,i++
.,
cross-section of deuterium and oxygen at this
energy are z.iand 1.6 b, respectively. ,
a)Whatistlremacrosbopictotilcross.sectionofheavywaterat2MeV?
,)H:il*fk:rrrrsttheslabbetoreclttccthcintensity,ir.tr'"uncollidedbeambya
c) If an incident neutron has a collision in the slab. r.vhat is the relativeprobability
it collides with deuterium?
that
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