subatomic physics at ifa - aarhus universitet · subatomic physics at ifa from an experimentalist...
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Subatomic physics at IFA
From an experimentalist point of view.
Jacob G. JohansenAarhus University
October 31th 2012
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The world of a subatomic physicist
Isotopes:
300 stable
7000 bound
3000 discovered
Describing the structure of all nuclei (QCD).
Most theories developed from stable nuclei.
Interesting effects occur with large P-N discrepancy.
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Astrophysics
Hans Fynbo in the search of
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Astrophysics
Nuclear chart:
After Big bangZ
N
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Astrophysics
Nuclear chart:
After Big bang Today
Z
N
→
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The triple α-process
Triple α-process:
τ8Be = 0.12 fs
11B + p → 12C → 3α.
Which states are populated?
What are the decay channels?
γ-decay3α
α+8Be.
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The local facilities
400keV accelerator:
5MeV accelerator:
11B + p → 12C → 3α.
Kasper Lind Laursen
Morten Lund
Silicon detectors:
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The rp-process
The rp-process:1H or 4He capture
β-decay
Waiting points
Interesting nuclei:31Ar → 30S
Gunvor Koldste20Mg → 20Na
Morten Lund
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Producing exotic nuclei requires exotic places
Jyväskylä
Gröningen
Genevé
Vancouver
Darmstadt
Dubna
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An example of an experiment at CERN11Be + 2H
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Beryllium isotopes
The neutron rich Beryllium isotopes:
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Transfer reactions starting with 11Be
p n
11Be(1/2+)
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Transfer reactions starting with 11Be
〈12Be; 0+| = α 〈10Be; 0+| 〈2n, 1s21/2
| + β 〈10Be; 0+| 〈2n, 0p21/2
| + γ 〈10Be; 0+| 〈2n, 0d25/2
|
p n
11Be(1/2+)
p n
d(11Be,p)12Be
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Transfer reactions starting with 11Be
〈12Be; 0+| = α 〈10Be; 0+| 〈2n, 1s21/2
| + β 〈10Be; 0+| 〈2n, 0p21/2
| + γ 〈10Be; 0+| 〈2n, 0d25/2
|
p n
11Be(1/2+)
p n
d(11Be,p)12Be
p n
d(11Be,t)10Be
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Transfer reactions starting with 11Be
〈12Be; 0+| = α 〈10Be; 0+| 〈2n, 1s21/2
| + β 〈10Be; 0+| 〈2n, 0p21/2
| + γ 〈10Be; 0+| 〈2n, 0d25/2
|
p n
d(11Be,d’)11Be
p n
d(11Be,p)12Be
p n
d(11Be,t)10Be
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How?
CERN:
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How?
CERN: ISOLDE:
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How?
CERN: ISOLDE:
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How?
CERN: ISOLDE:
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How?
CERN: ISOLDE: The setup:
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The analysis
12Be:
E*-2 -1 0 1 2 3 4
N
0
200
400
600
800
1000
1200
1400
1600
11Be:
E*-2 -1.5 -1 -0.5 0 0.5 1 1.5
N
0
1000
2000
3000
4000
5000
10Be:
E*-2 -1 0 1 2 3 4 5 6 7
N
0
100
200
300
400
500
600
700
800
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The analysis
12Be:
E*-2 -1 0 1 2 3 4
N
0
200
400
600
800
1000
1200
1400
1600
E0 0.5 1 1.5 2 2.5 3
N
0
500
1000
1500
2000
2500
11Be:
E*-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
N0
1000
2000
3000
4000
5000
E0 0.2 0.4 0.6 0.8 1 1.2
N
0
500
1000
1500
2000
2500
3000
3500
10Be:
E*-2 -1 0 1 2 3 4 5 6 7
N
0
100
200
300
400
500
600
700
800
E0 1 2 3 4 5 6 7 8
N
0
100
200
300
400
500
600
700
800
Triton_EGammaEntries 70170Mean 1.409RMS 1.309
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Crossing a barrier never ment to be crossed
12Be: 11Be: 10Be:
0 30 60 90 120 150 180t
1
10
x
A
0 30 60 90 120 150 180t
1
10
x
B
0 30 60 90 120 150 180t
0.1
1
10
x
C
0 30 60 90 120 150 180t
1
10
x
D
0 30 60 90 120 150 180t
10
100x
0 30 60 90 120 150 180t
1
10
x
A
0 30 60 90 120 150 180t
1
10
x
B
0 30 60 90 120 150 180t
1
10
x
C
0 30 60 90 120 150 180t
1
10
x
D
0 30 60 90 120 150 180t
1
10
x
E
0 30 60 90 120 150 180t
1
10
x
F
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Summary and advert
We are trying to understand the structure of all isotopes
Nuclear physic is applied in medical physic and astrophysics.
We are trying to reproduce the reactions in laboratory
InhouseAt large accelerator facilities around the world
Examples on nuclei we study: 12C, 31Ar, 30S, 20Mg, 20Na and10,11,12Be.
Exotic nuclei are produced by fragmentation.
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Summary and advert
We are trying to understand the structure of all isotopes
Nuclear physic is applied in medical physic and astrophysics.
We are trying to reproduce the reactions in laboratory
InhouseAt large accelerator facilities around the world
Examples on nuclei we study: 12C, 31Ar, 30S, 20Mg, 20Na and10,11,12Be.
Exotic nuclei are produced by fragmentation.
Thank you
More info on 10,11,12Be at my PhD-defence, December 7th
J. Johansen (AU) Subatomic physic October 31th 2012 15 / 15