présentation - congrès international sur le rayonnement ...cowan/ewc/leighton_bagneres_de... ·...

3
'D-Z Butler - Few of our tt^a come from the plate; of those that do_,soii© are ereated by high energy particles, some by more n-ioderete energied particles (few Bev. ). D - 2. RIGEÎ^ LlEASURSlEI-niS ON CHARGID f-PARflGLlS Leighton ".(Pasadena) I-.Iost of the observations have been made in E ehembers sej^rated by a pb plate and sur mounted by a Pb productiomayer^ Relative frequeney of 7"*" and ¥" It has' been already -reported (Phys, S8?7rTïïâTToFTMrgeTT^T"p7oduced in the production layer there is an-excess of négative particles ?âiilst the reverse is true for ?*s formed in the plate, The latest figures still indieate this, Below the total results to date are glven^ the brachetteâ figures being those already published i s Prom production î' layer s s Prom plate : î Total jMo of : 14 (8) ' 2S (18)' : 36 {E6) Ho of f- 25 (18 1 : : 12 (9) - : ; . 37 (27) : ' If ail eharged ¥-partlcles are the same^^ the probability of an asymmetry as great as the above is about 10"**^» Life-Time » The possibility of there being 2 ¥-types with différent pôHTîve~"to négative ratios is supported by the measured life times* 5- 4 3 Z I CHAROED V-PaRTiC).ES dl&triborron of (>(/ci) SOUD UNE " PO&lTIVE ABOVE DASHEDMNE' NEGATIV/e. A0OVE a n "U a L... m * \n < 51 o «.4 0'2l- 1 4 CHARQED V-PARTlCLES dl&Mbunon of (Ji/d) SOilO UHB POSITIVE FROM PLATE DASHEO UME NEGATIVE FROM Pt^TE tUin 0 .1 ,2 .3 .4 ,5 .6 ,7 3 ,9 \p Pij^re D-«£, 1 0 ,1 .2 ,3 .4 .5 .6 .? .9 to fX/d) Plgure D-2,. In the upper chamber the decay of both positive and négative par¬ ticles is distributed uniforaily* In the lower chamber, there it-; i\ _ ^^^ high uroportion of V^'^s decaying near the plateA"fiB'^«-:-e j'-'--^-' ? 1 ' 2) -97- ^l'iiiiii'MilMIii^^^ D-i I vtfould like to eomgnt briefly on the interest ing discoveï'y of a nositivelv eharged y-particle with a secondary heavier than the ni»mesoriCYork et al. (1963)). le have made aceurate measurements on 25 Ii «narticles and have not found a si-mi.lar example « She measurements on the primary particles are very incomplète but there are five cases. whlch could be heavier than the proton(i.e« have secondaries of Pro» tonic mass), HOW York et al have suggested that their event may be an exaiïçle of the decay oT*aTÎ -particle according to the schemes. V+ ^p- + Tt Q. ¥a If the yT is the eharged counterpart of the ^paruicle and if it ias the lame mass, then Q =^ 40 Aev and the maiimum possible value vm = 110 llev/c! However, ail of the fiye positively eharged ^ ^ V-uIlfeicles which might be more massive than the proton have values - , of ^fgîeate/than 110 Kev/c / f hus we consider that only a verv small fraSlion of our events could be Y^ -particles (with a = 40 .lev] . .SISQtlSSlOH - - - - -iuart from mass values only one event ralghfe àistinguish a B tif^chi - the one .tiere the secondary suffers a large angle scatter in the piston - eould this be coulomb scatter of a ji-J Butler - After scatter the meson has a momentum of 35 Aev., t^efore scatter the momentum can»t be measured but ia probably ^Ml50 Aiev - at such a value coulomb scatter of the ^- is unixkeiy. Sard - Ilatil tha ;i^ decay spectrum is known ttxe ;i-e curve might be "~~~° used to find the pm distribution^ Butler - fhis is what Afork has doue. , -if'h«l -^he theoretical spectrum Is.not unambiguous, there are other ^^^^^^ uossibîe cSrveL In^tte cas8 of -B sero raass neutral particles the shape couid be very di fièrent. ïïewtîx * Event P33 (see figure) differs in its J?ff ^^« ^^?^^*|^ ^^^^ ..i-h^î''? - in View of the results of t ne Oal. fech, \-Aio iina B life tSest aouîâ you say how long this f lived ,in the chamber ? , -/^ 5 s 10"^^. It is of ,positive charge. ^ a dete,rmination 5 the momentum, in the rest «f^^ff ^f^ ^^"^^^ doeS the biggest error corne -from the ionisation estimate on ., ' the secondary momentum? . , ' Butler - Secondary morne ntum« '., . , ^ :. - ? - Can you say anythlng of the energy of the particles that. créâtes the f ? " " ,5'«

Upload: others

Post on 04-Aug-2020

2 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Présentation - Congrès international sur le rayonnement ...cowan/EWC/Leighton_Bagneres_de... · 'D-Z Butler-Few of our tt^a come from the plate; of those that do_,soii© are ereated

'D-Z

Bu

tler

-F

ew

of

our

tt^a

com

efro

mth

ep

late

;of

those

that

do

_,so

ii©a

reereate

db

yh

igh

en

erg

ypartic

les,

so

me

by

mo

ren-io

dere

te

en

erg

ied

pa

rtic

les

(few

Be

v.

).

D-

2.

RIG

EÎ^

LlE

AS

UR

SlE

I-niS

ON

CH

AR

GID

f-P

AR

flGLlS

Leig

hto

n".(P

asa

de

na

)

I-.Iost

of

the

ob

se

rva

tion

sh

ave

be

en

made

inE

eh

em

be

rssej^

rate

dby

ap

bp

late

and

su

rm

ou

nte

dby

aP

bp

ro

du

ctio

ma

ye

r^

Re

lativ

efre

queney

of

7"*"and

¥"

It

has'b

een

alre

ady

-reporte

d(P

hys,

S8

?7

rT

ïïâT

To

FT

Mrg

eT

T^T

"p

7o

du

ce

din

the

pro

du

ctio

nla

ye

rth

ere

isan-e

xcess

of

négativ

epartic

les

iilst

the

reverse

istr

ue

for

?*s

form

ed

inth

ep

late

,T

he

late

st

figures

still

ind

iea

tethis

,B

elo

wth

etotal

results

tod

ate

are

glv

en^

the

bra

ch

ette

âfig

ures

bein

gth

ose

alre

ad

yp

ub

lish

ed

i

sP

rom

productio

n

î'la

ye

rs

sP

rom

pla

te

:

îT

otal

jMo

of

:

14

(8)

'

2S

(1

8)'

:36

{E6)

Ho

off-

25

(18

1:

:12

(9)

-:

;.

37

(27)

:

'If

ail

eh

arg

ed

¥-p

artlc

les

are

the

sam

e^^

the

pro

ba

bility

of

an

asym

metry

as

gre

at

as

the

ab

ove

isa

bo

ut

10

"**^»

Life

-Tim

Th

epossib

ilityof

there

bein

g2

¥-ty

pes

with

diffé

re

nt

pôH

Tîv

e~

"tonégativ

era

tios

issupporte

db

yth

em

ea

su

red

life

time

s*

5-

43ZI

CH

AR

OE

DV

-Pa

RT

iC).E

S

dl&

triborro

nof

(>(/c

i)

SO

UD

UN

E"

PO

&lT

IVE

AB

OV

E

DA

SH

ED

MN

E'

NE

GA

TIV

/e.

A0

OV

E

an

"U

aL...

m*

\n<5

1o«.4

0'2

l-

14

CH

AR

QE

DV

-PA

RT

lCLE

Sd

l&M

bu

no

nof(Ji/d

)

SO

ilOU

HB

PO

SIT

IVE

FR

OM

PL

AT

E

DA

SH

EO

UM

EN

EG

AT

IVE

FR

OM

Pt^

TE

tUin

0.1

,2.3

.4,5

.6,7

3,9

\p

Pij^

re

D-«

£,

1

0,1

.2,3

.4.5

.6.?

.«.9

to

fX/d

)

Plg

ure

D-2,.

Inth

eupper

ch

am

be

rth

edecay

of

both

po

sitiv

eand

ga

tive

par¬

tic

les

isd

istr

ibu

ted

un

ifora

ily*

Inth

elo

we

rcham

ber,

the

re

it-;i\

_^^^

hig

hu

rop

ortio

nof

V^'^s

de

ca

yin

gn

ea

rth

epla

teA

"fiB'^

«-:-e

j'-'--^-'?1'

2)

-9

7-

^l'iiiiii'M

ilMIii^

^^

D-i

Ivtfo

uld

like

toe

om

gn

tb

rie

flyon

the

inte

re

stin

gdis

coveï'y

of

an

ositiv

elv

eh

arg

ed

y-p

artic

lew

itha

se

co

nd

ary

he

avie

rth

an

the

ni»

me

so

riCY

ork

et

al.

(1963)).

leh

ave

made

ace

ura

tem

ea

su

rem

en

tson

25

Ii

«n

artic

les

an

dh

ave

no

tfo

und

asi-m

i.lar

exa

mp

le«

Sh

em

easure

ments

on

the

prim

ary

partic

les

are

ve

ryin

co

mp

lète

bu

tth

ere

are

five

cases.

wh

lch

co

uld

be

he

avie

rth

an

the

pro

ton

(i.e«

ha

ve

se

co

nd

arie

sof

Pro

»to

nic

ma

ss),

HO

WY

ork

et

al

ha

ve

su

gg

este

dth

at

the

irevent

may

be

an

exa

iïçle

of

the

de

ca

yo

T*a

-partic

leaccord

ing

toth

eschem

es.

V+^p

-+

Tt

Q.¥a

If

the

yTis

the

eh

arg

ed

counte

rpart

of

the

^£^paru

icle

and

ifit

ias

the

lam

em

ass,

the

nQ

=^4

0A

ev

and

the

ma

iimu

mpossib

levalu

eo±

vm=

110

llev/c

!H

ow

ever,

ail

of

the

fiye

po

sitiv

ely

eh

arg

ed

^^

V-u

Ilfeic

les

whic

hm

ight

bem

orem

assive

than

the

pro

ton

ha

veva

lue

s-

,o

f^fg

îea

te/th

an

110K

ev/c

/f

huswe

co

nsid

er

that

on

lya

verv

sma

llfra

Slio

no

fo

ur

eve

nts

could

beY

^-p

artic

les

(with

a=

40.le

v]

.

.SIS

QtlS

SlO

H-

--

--iu

art

from

ma

ssva

lue

so

nly

one

event

ralghfeàis

tinguis

ha

Btif^

ch

i-

theone

.tiere

the

seco

ndary

su

ffers

ala

rge

an

gle

scatte

rin

the

pis

ton

-eould

this

be

coulo

mb

scatte

rof

aji-J

Butle

r-

Afte

rscatte

rth

em

eso

nhas

am

om

entu

mof

35

Aev.,

t^efo

re

sca

tter

the

mo

me

ntu

mcan»t

be

me

asu

red

bu

tia

pro

bably

^M

l50

Aie

v-

at

such

avalu

eco

ulo

mb

scatte

rof

the

^-

isunix

keiy

.

Sard

-Ila

tilth

a;i^

decay

spectru

mis

know

nttxe

;i-ecurv

em

ight

be

"~~

use

dto

fin

dth

epm

dis

trib

utio

n^

Butle

r-

fhis

isw

ha

tA

fork

ha

sd

ou

e.

,

-if'h«

l-^

he

theore

tical

spectru

mIs

.no

tunam

big

uous,

there

are

oth

er

^^^^^^u

ossib

îecS

rveL

In^tte

cas8of

-Bsero

raassn

eu

tral

pa

rticle

sth

eshape

co

uid

be

ve

rydifiè

rent.

ïïewtîx

*E

ventP33

(seefig

ure

)diffe

rsin

itsJ?ff^

^^?^^*|^

^^^^

..i-h^î''?

-in

Vie

wof

the

resu

ltsof

tn

eO

al.

fech

,\-A

ioiin

aB

lifetS

est

aouîâyou

sayhow

long

this

fliv

ed

,inthe

chamber

?,

-/^

5s

10

"^^.

It

isof

,positiv

ech

arg

e.

^Tû

adete,rm

ination5

the

mom

entum,in

there

st«f^

^ff

^f^^^"^

^^

doeSth

ebig

gest

erro

rcorne

-from

the

ionis

atio

ne

stim

ate

on.,

'th

ese

co

nd

ary

mo

me

ntu

m?

.,

'

Bu

tler

-S

econdary

morn

en

tum

«'.,

.,

^:.

-?

-C

an

you

say

an

yth

lng

of

the

energ

yof

the

pa

rticle

sth

at.

créâte

sth

ef

?"

"

,5

Page 2: Présentation - Congrès international sur le rayonnement ...cowan/EWC/Leighton_Bagneres_de... · 'D-Z Butler-Few of our tt^a come from the plate; of those that do_,soii© are ereated

Z

Ma-ss

of

the

f-seconta

rle

s*

ÎMe

dete

rmin

ed

va

lue

s.

'gro

up

..about,

a.,..

73:tr'^

^fo

Sï3

:nrW

tWé-B

eolth

epiâ

nA

>>

,,th

ou

gh

adis

tinctio

n'

betw

een-

the

twQ

,.:ts"

not

po

s-s

-ible

.-ll'ig

ure

s-

D-S

,,-3

anâ

4)

'

-A

sm

all

num

ber

of

positiv

esecondarie

scould

be

pro

tons*

,

10

MA

SS

ES

ûf=

£H

AR

G&

0V

SE

CO

ND

AR

IES

posfff'y

eA

ne

ga

hvô

.

CH

AR

ûE

DV

-P

AR

TIC

LE

S

IS

EC

ON

DA

Ry

MA

SS

ES

IgC

AS

ES

50

loo

'500

leoo/>"

(Me\/

figu

re

I).*2,

3

'/c)jo

o5

oo

mm

Ms^iz

ÈxJ,

Boo

MA

SS

(m

a)

Ma

ss

of

,the

tt

-îh

ose

ch

arg

ed

'-.-f'^s

of

,gre

ate

rth

an

mln

iîàu

mlo

nl-

ialIin

^^se*m

om

enta

ea

n-b

e,

me

asu

red

'ha

ve

ad

istr

ibu

tion

of

de

ter-

,mlù

ed'

ma

sse

sabout

10

00

.mg

*.,{P

.igu

re,s

:.D-2,».

-5,and

'6)

MA

SS

ES

OP

CH

AR

ûE

PV

-C

HA

(?C

,ED

V-P

AR

TIC

LE

S

PR

IMA

RY

MA

SS

ES

So

loo

50

01O

O0

f(H

ev/c

)2

00

.60

0lo

oo

Zo

oo

MA

SS

(We

)

fig

ure

2)*2

.^,..6

,

m03

u.

oo2

I0--

5-

1_

cHA

Rc,E

o^v-P

AR

T.ct.^E

s.gr

SU

SV

er36

_mom

entu

m,

Pt

d..l.s

tr.m^tlQ

l"T

K~

irilr

lWtîo

ûis

co

ne

LS

-

r'

.

I

^.

dia

tt-lb

utio

n

C.l.-T

.f4

oC

A&

ES

)

-M

AN

CH

ES

TE

R

C33

CA

SE

S)

100

20

03

00

tent

with

the

assum

ptio

no

f.a'E

-'

bo

dy

'âee

ay

^Cth

aP*

of

20

0M

ev/o

*(fig

ure

D.2

,7

)

Ata

u-m

esoa

-In

anerr

chan'ib

er

Srrâ

ngem

ë^

',.

.a..n

ega-;

.tiv

e'

tau-m

eson

ha

s'b

ee

nobserv

ed»

ï'he

seeondary-pi

with

the

hig

hest

mo

me

ntu

mh

as

alo

ng

tra

ck

inth

e

eh

aa

ibe

rand

an

aa

cu

ra

teQ

of

?0

+3

Mev

is,

obta

ined.

,

Plg

ure

I}*S

,,1

PT

fMa

v/e)

~9â-

Oascads

eve

nts

-3

ea

so

sof

?«»s,

apparently

com

ing

from

the

dis

in-

TefP

?'a

rio"n

'"'oî'''â

eh

arg

ed

v"m

ve

be

en

fou

nd

;tw

oof

thè

se

are

fro

mth

e

do

ub

lech

aa

be

rand

on

efr

om

th

at

of

Cow

an»

A{-,

luever_y

ca

se

tlieg

&o

mtb

ryis.

^1

lîio

iBQ

Dta

:(A

ppro

xim

ate

)

Pbc'

^0

,2B

ev/c

=1

Be

v/c

%f

'de

4B

'ev/e

(from

P|.

ba

lan

ce

)

Go

pla

na

rily

of

AB

Cw

ithp

oin

tD

isgo

od

».

'

Go

pla

na

rity

of

Dlf

with

po

int

B

isgoo

d.

Cascade

r<B

cay

:-.'....^.P

ound

"by

Dr*

B*V

f«G

ovia

n

A

\A:^

A

V

"Y\

V.

\

._A

\...A

%

Case

au

e.i)o

o-'v

vA

,.

^^i

Mom

mta

z(A

pp

roxim

ate

)

P^Q

==

Oai

Be

y/c

%Q

-~

0^4

-Be

v/c

-^â

f'"^

Q^^

Be

v/e

liasse

BG

isT

l'^orp

""'

is.>

10

00

,me

,and

isconsis

¬te

nt

with

proto

n*

mis

<'^

600.

loata

atio

iisfA

pp

roxim

ate

)

IbQ

?'2

*I-Q

Itf.

r1

^1

*2

Io

fAll'

oth

ers

^^Iq

)

Copla

sarity

of

DE

'.lw

ith

po

int

Bis

good«

Oopla

narity

of

AB

Ow

ithpoin

tD

is-g

ood»

Page 3: Présentation - Congrès international sur le rayonnement ...cowan/EWC/Leighton_Bagneres_de... · 'D-Z Butler-Few of our tt^a come from the plate; of those that do_,soii© are ereated

D-^

0-2

,3

^^'

fcm

enta

î(A

pp

roxiiM

te)

Pl3Q

î=188

+15

Me

v/c

Pg^f

=1

95

+26

lev/c

(but

track

appears

to"h

ave

asm

all/s

ingle

sca

tterin

g)

,P

ij-i-

170

tÏ2

He

v/c

(Pdf

===265

+20

.anâ.

ene

rgy"lo

ss

thro

.ug

hpla

tsfo

rp

l*m

eso

n)

Me

v/c

usin

gP

j_.»3

thro

.uè

hpla

te''

loniz

atio

nsï

AU

<1

*5

Iq*

Oo

pla

na

rity

of

flD

with

Bis

good

Oopla

narity

of

PE

Bw

ith0

isgood

Gopla

nariffc

yo

fA

BC

with

Dis

good

,Oagcade

Decay

.

{Pouad

By

f-.A,J

«T

an

Lin

fcl

'

The

clm

nces

are

more

tha

n.1

0**'

toI

ag

ain

st,

thè

se

2a

the

aa

iieh

.este

re

ve

nt

be

ing

due

toa

fortu

itou

sassociia

tion

of

aeharg

ed

and

ne

utr

al.

Y*

',-..-.

.,

Inail

Sca

se

s-

the

po

sitiv

esecon

dary

of

-th

e1°

lies

ne

are

rth

elia

eof

flig

ht

of

f^th

an

does

the

ga

tive

,{th

isis

pro

bably

als

otru

eo

fth

eA

aneheste

re

xa

mp

'le,

)anâ

iath

eca

se

xo

fC

ow

an-?

sexam

ple

am

ass

term

ina

tion

of

tîae

po

sitiv

ef«

secondary

giv

es

a/

18

00

m^.

If

ap

pe

ars

»th

ere

fore

,th

at

the

p'o

sitiv

e-s

econdary

ha

s'a

la'rg

er

ma

ss

than

the

négativ

-,

'

If

the

isa

?î,

the

mass,

of

the

eharg

ed

fm

ust

be

super-

pro

tonic

.-

',",-''

AU

fou

rof

the

charg

ea

Y-partid

es

deeayin

gin

toY

*a

reof

ga

tive

sig

n.

-

"D

I3G

ÏÏSS

I0M

Pe

ters

-T

he

po

ssib

ility

of

afo

rtu

itou

sassocia

tion

of

a-

Y*

and,

aY

tw

illbe

un

de

restlm

ate

d'if

the

s-e

i,ea

tendency

for

thè

'two

typ

es,

of

Vto

'p

rod

uce

dsim

ulta

o'u

sly

*W

ehave

anum

ber

o,f

ca

se

sw

i»re

£¥

**s

ap

pe

ar

from

asin

gle

inte

ractio

n*

_.-f<

30

leig

hto

a--S

uch

an

exp

lan

afc

ion.o

fth

ephenom

ena

would

als

orequire

adirectio

na

lre

latio

nsh

ipin

the

ém

issio

no

fth

e2

?'s

,

It

wo

uld

be

note

d-to

oth

at

the

Y*

alw

ays

deeays

afte

rth

eV

-.

Re

yn

old

s

Leig

hton

With

réfé

rence

to

th

esim

ulta

neous.

productio

no

fY

°'s

it

appears

this

i-s.

more

com

mon

fer

Y°|s

Ao

évid

en

ce

on

this

poin

t.

tiian

V"lsi^

Beynold

s-If

the

events

.a

re

due

tochance

associa

tion^

one

\T0ix

ldex«

pe

et-'ffio

recases

where

-th

ere

wa

sno

géom

étr

ieco

rré

latio

n

be

twe

en

the

two

Y^s.

-A

eg

et

only

Isu

ch

sp

urio

us

event,

Le

igh

ton

-'ie

ha

ve

afe

w.

.

?

Le

igh

ton

-'

Wh

at'

can

be

said

of

the

dis

tan

ce

of

the

from

the

Yt

fenow

iûg

tlteY

°lif

etim

e?

If

eye

ryY

tunderw

ent

this

typ

eo

fm

an

y-

mo

re,th

an

we

do

-le

ss

than

de

ca

y^,

we

sh

ou

ldse

e

6J-ô

'ça

nbe

of

th

isty

pe

D-.

3:.

QU

ELQ

UE

SR

ES

UL

TA

TS

SU

RL

ES

VC

HxlïlG

ES

W«B

.Irette

r,-

,B

,3^G

regory,

P.J

ohnsto

a,

A.Ia

ga

rrlg

ue

.

-H

/M

eyer;A

P.-:lfc

ller»

-G

.Peyro

u-{E

co

leP

oly

technitu

e)

Avant

.de

yous-^

âonner

quelq

ues

sulta

tssur

les

riésons-Y

ch

arg

és,

36

va

isvo

us

décrire

briè

ve

me

nt

no

tre

,e

xp

érie

nce

du

Pic

-d

u-M

idi.

'"''--'---L"«

insta

llatio

ne

st

repré

senté

esur

lafig

ure

D-3

,1

(pa

ge

su

i-.

va

nte

Yous,

voyez

qu

'elle

co

mp

orte

essentie

llaaent

de

ux

gra

nd

es

ch

am

¬

bres

de

ï'Iilso

n,-

situ

ées

à109

em

l*une

au-d

essous

de

l'autre,

et

de

dim

en

sio

ns

utile

s64

x68

x30

po

ur

lach

am

bre

du

haut

^e

t'6

4x

68

x40

po

ur

ia-

ch

am

bre

du

ba

s.

La

ch

am

bre

du

haut

est

da

mu

ndia

mp

sm

ag

tiqu

ede

E6

00

gauss»

lach

am

bre

du

bas

com

porte

14

écra

ns

alte

nés

de

Ge

t,d

eP

be

om

IHndlq

ue

laf

igu

re^G

ha

qu

echam

bre

est

ph

tog

rap

hié

'©par

.-3a

pp

are

ils,

l'an

gle

extrê

me

de

sté

téoscopie

éta

nt

d'^

enviro

h11:-:,'**A

A/'

''le

'-systè

me

-de

décle

neh

em

ent

exig

eune

coïn

cid

mce

trip

ledans

lebanc

de

com

pte

urs

B'a

u-d

essus

de

la,c

ham

bre

tu

haut

acco

mp

ag

e

un

ecoïn

cid

ence

sim

ple

da

ns

les

com

pte

urs

Gentr

ele

s2

cham

bre

s.

n^

ya

.'aucun

com

pte

ur

au-d

essous

de

lacham

bre

du

bas

de

faço

an

tic

oîn

cid

en

ae

sIl

,

, ^

ne

pas

intr

od

uire

de

séle

ctio

n,

-les

an

tico

încid

en

ae

sA

pro

tèg

en

tle

sgerb

es

éle

ctr

oniq

ues

ou

nuclé

aires

qu

ipourraie

nt

se

produire

da

ns

lab

ob

ine

.O

aobtie

nt

ain

si

en

viro

Ofo

de

ge

rbe

spénétra

nte

s,

laplu

part

de

grande

én

erg

ie^

Je

pa

sse

ma

inte

na

nt'

au

xré

su

ltats

su

rle

sf

c'h

arg

és^

'D

an

su

od

ép

oh

illeM

en

t'ra

pid

ed'e

nviron

-7^0

00

ph

oto

s,

on

atro

uvé

dans

-lae

h-a

ab

reau

h-a

iit^M

vt

(ce

que

l»o

np

eu

tco

mp

are

ravec

les

v

^4

si'

iHaH