Download Document

From Nuclei to Neutrinos
The Naming of the
Denys Wilkinson Building
21 June 2002
Nick Jelley
The Optical Model
ds/dW
29 MeV 3He on 14N
1962
Particle Identification
p d3
H
3He
4He
10
100 MeV
DE E
Particle Identification
p
d
3H
4He
40 MeV protons on carbon
1967
114 MeV 12C beam on carbon
1974
Selectivity in Heavy-Ion Reactions
High Spin
Low Spin
114 MeV 12C and 11B beams on carbon
Excitation Probability
Proton Radioactivity
49 MeV 16O beam on calcium
1970
53Com
245 ms half-life
40Ca(16O,2np)53Com
Discovery of
14C
radioactivity
1984
DE-E telescope
Alpha-decay of Heavy Nuclei
1990
Geiger-Nuttall Plots
14C
dating
modern
14C
13C
old
Nature
1978
14C
13C
The Oxford Microprobe 1986
p-induced X-rays
12.5 m
Magnetic Moments of Excited States 1984
19F
+
1H
_
16O*
+a
90o
19F
16O
_
foil stopper
6.13 MeV 3|g| = 0.556(4)
6.13 MeV
stopped
0o
flight
90o
0o
Parity Violation 1957 1983
1+ 13.19 MeV 20Ne _ 16Ogs
11.26 MeV
b decay of 8Li and 8B:
The Second-Class Current Problem
1971
8B _ 8Be* + e+ + n
8Li _ 8Be* + e- + n
second-class current gIT = 2.10-3
|gIT | < 7.10-4
Solar Neutrinos
8B
 8Be* + e+ +n
Sudbury Neutrino Observatory
n Reactions in SNO
n e + d  p + p + e-

CC
ne only
-Good measurement of ne energy spectrum
-Weak directional sensitivity  1-1/3cos(q)
Equal cross section
for all n types

n x + d  p + n +n x

NC
All n types but
-Measure total 8B n flux from the sun.
ES
ν x + e-  ν x + e -
-Low Statistics
-Strong directional sensitivity
enhanced sensitivity
to ne
A Neutrino Event
Signal Extraction Results
CC 1967.7 +61.9
+60.9
ES
NC
263.6
+26.4
+25.6
576.5
+49.5
+48.9
SNO Results 2002
n flux
106
7
cm-2 s-1
6
5
Standard Solar Model
4
5.3 s
3
1/3 SSM
2
1
SNO CC
SNO NC
n Oscillations before
after SNO
Combining All Experimental
and Solar Model information
Flavour Oscillations