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This projer::t r a l e t e s to the u l t Lo.a t.e structure
of all matter. .Ju s t .:::-: the aL01n is a srna Ll soler- ?1':j: -: n with
tiny electrons going around its central part known as the
nucleus, s l m iLn r l y , the nucleus Lts e l f is a complex structure.
It i? maJe up of n?utrc11s and protons, two particles which
;;ire ci:.,out 1,840 times more rne s s.l ve than ti1e electron.
fhey ?;re, spoken of col 1 ec ti v e l y as nucleons .. f-,ucl eons ar e not
stationary bu c mo vo w i cr. tr erne nc.o ua s pe ed s w i t h Ln the nuc Le L
of the a torns , Our pr ob.l er., is to find out tl e morne n t a
(products of mn ss ;3.nd velocity) of these: mov ing nuc l eons.
The straigh?forward approach to studying the
v a ri ous properties of t h e nucleus is to shoot the probing
particles at them and measure the effects pro?uced. There is,
r.owe ve r , one we l 1 known 1 irri t e t i on in this endeavour: the
v1r1v01 cngth of the probi nCJ p s r t i c l e must be of the o r o c r of
thr-, s I z e of the nuclei bo Lnq studied. Ord i.n a r y Li qh t for
ex?m?le, has a wavcl?nqth ahout 10-7m, which is many order?
-14 larger than the nuclAar size (10 mJ, and is
no l: s u i t Ab 1 e for th i s ?1 tud y • I t is therefore n e c es s a r y to
cm p I oy parti cl es such ;-.\s e 1-.?c tr...)n s, protons, an ti p r o tons a. ,d
nout.r oris as pr obe s since their wav e Len qt.h s a r e much srna i ler.
In this project v•e e:n!.1loy a very effective probe ( the an t I>-
proton) which goes in:::idr_ the nucleus of an a t.orn anc Ln t e r=
act? with the nucleons. 7hese interactions, known ?s
;..! nr. i h i l c! t i c n ?.:; , revca l t n E uc h a vi o 1 r of the inhar i
-
t: n ts of
the nucleus, that is, of ?rotons and neutrons individually,
as ·,;?11 a s the:l.r c o l Lric t.Lv e ber1aviour. By studying large
nur.ue r of a n n Lh i La ti.oris , the d i.s tr Lbu ti on of momenta can be
d:?t·::rt"incd. Once the rno.nr-?nta of the nucleons are known,
,.any other properties of the nucleus
I.. ,
f?ler,1..;.nt can be k nown , Th( s t a t e of the nuc Le i. a f t e r
' ;-_rnnihilation c an al so t h r ow llght on nuclear energy levels
and tne whole science of nuclear spectroscopy, but there are
better techniques availa?le for this study than the nuclear
ornu I sions. The p r o j ec t h a s great be a r I ng on many r-robLerns of
nucle2r physics.
The rnomcn t ur-r.
, d i o tr i bu t Lon of nuclei of light
8lements was found by measurin? the lengths of tr2cks of
recoil of these nuclei and wc-:is c ornp ar ed with the d Ls tr Lbtr t.-«
ions predicted for sand p-state nucleons of carbon ?iven by
Garron et al. It is f oun.I that the distribution closely
c o rr e s po nd s with the s-:3tate nucleons. It is, therefore,
concluded ?hat annihilation takes place chiefly on the s-
nucle?ns of the light elements of emulsion. This result
s i.ows an Ln h i.b i. tion of interactions w.i th r-state nucleons
the t L:-;, with nucleus po s s e ss ing higher angular momenta.
Similar inhibition has Le e n r er-ort eo by Go od i.nc, 2r: .... hJgh for
s how s that the upper Li m i t of nucleonic momentum extends
up to 5 5 0 t': e v I c • CtJr results a r e different from the earlier work
done by the Durham grcup usi.nc; the same technique. |
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