From Nuclei to Neutrinos The Naming of the Denys Wilkinson Building 21 June 2002 Nick Jelley. The Optical Model. d s/ d W. 29 MeV 3 He on 14 N 1962. Particle Identification. p. d. 3 H. 3 He. D E. E. 4 He. 10 100 MeV. p. d. 4 He. 3 H. - PowerPoint PPT Presentation
Transcript of From Nuclei to Neutrinos The Naming of the Denys Wilkinson Building 21 June 2002 Nick Jelley
From Nuclei to Neutrinos
The Naming of the
Denys Wilkinson Building
21 June 2002
Nick Jelley
dd
29 MeV 3He on 14N1962
The Optical Model
10 100 MeV
p 3Hd
3He4He
Particle Identification
E E
Particle Identification
40 MeV protons on carbon1967
p
d
3H4He
114 MeV 12C beam on carbon1974
Selectivity in Heavy-Ion Reactions
Excitation Probability
High Spin
Low Spin
114 MeV 12C and 11B beams on carbon
40Ca(16O,2np)53Com
Radioactivity
49 MeV 16O beam on calcium1970
53Com
245 ms half-life
Proton
Discovery of 14C radioactivity1984
E-E telescope
Alpha-decay of Heavy Nuclei1990
Geiger-Nuttall Plots
14C dating
Nature1978
14C
13C
14C13C
modern
old
The Oxford Microprobe 1986
p-induced X-rays
Magnetic Moments of Excited States 198419F + 1H 16O* +
6.13 MeV 3
g0.556(4)
0o
90o
6.13 MeVstopped flight
19F
foil stopper
0o
90o
16O
1+ 13.19 MeV 20Ne 16Ogs
11.26 MeV
Parity Violation 1957 1983
decay of 8Li and 8B: The Second-Class Current Problem
19718B 8Be* + e+ + 8Li 8Be* + e +
second-class current gIT = 2.103
|gIT | < 7.104
8B 8Be* + e+ +
Solar Neutrinos
Sudbury Neutrino Observatory
Reactions in SNO
-Good measurement of e energy spectrum-Weak directional sensitivity 1-1/3cos()
-Measure total 8B flux from the sun.
NCxx
npd
ES -- eνeν x x
-Low Statistics-Strong directional sensitivity
CC-eppd e
e only
Equal cross sectionfor all types
All types butenhanced sensitivity to e
A Neutrino Event
Signal Extraction Results
CC 1967.7 +61.9 +60.9
+26.4 +25.6ES 263.6
+49.5 +48.9NC 576.5
SNO CC SNO NC
1
2
3
4
5
6
7
Standard Solar Model
flux
1/3 SSM
SNO Results 2002
5.3
106 cm-2 s-1
Flavour Oscillations
Oscillations before SNO
Combining All Experimentaland Solar Model information