Subatomic physics at IFA
From an experimentalist point of view.
Jacob G. JohansenAarhus University
October 31th 2012
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.
J. Johansen (AU) Subatomic physic October 31th 2012 2 / 15
Astrophysics
Hans Fynbo in the search of
J. Johansen (AU) Subatomic physic October 31th 2012 3 / 15
Astrophysics
Nuclear chart:
After Big bangZ
N
J. Johansen (AU) Subatomic physic October 31th 2012 4 / 15
Astrophysics
Nuclear chart:
After Big bang Today
Z
N
→
J. Johansen (AU) Subatomic physic October 31th 2012 4 / 15
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.
J. Johansen (AU) Subatomic physic October 31th 2012 5 / 15
The local facilities
400keV accelerator:
5MeV accelerator:
11B + p → 12C → 3α.
Kasper Lind Laursen
Morten Lund
Silicon detectors:
J. Johansen (AU) Subatomic physic October 31th 2012 6 / 15
The rp-process
The rp-process:1H or 4He capture
β-decay
Waiting points
Interesting nuclei:31Ar → 30S
Gunvor Koldste20Mg → 20Na
Morten Lund
J. Johansen (AU) Subatomic physic October 31th 2012 7 / 15
Producing exotic nuclei requires exotic places
Jyväskylä
Gröningen
Genevé
Vancouver
Darmstadt
Dubna
J. Johansen (AU) Subatomic physic October 31th 2012 8 / 15
An example of an experiment at CERN11Be + 2H
J. Johansen (AU) Subatomic physic October 31th 2012 9 / 15
Beryllium isotopes
The neutron rich Beryllium isotopes:
J. Johansen (AU) Subatomic physic October 31th 2012 10 / 15
Transfer reactions starting with 11Be
p n
11Be(1/2+)
J. Johansen (AU) Subatomic physic October 31th 2012 11 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 11 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 11 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 11 / 15
How?
CERN:
J. Johansen (AU) Subatomic physic October 31th 2012 12 / 15
How?
CERN: ISOLDE:
J. Johansen (AU) Subatomic physic October 31th 2012 12 / 15
How?
CERN: ISOLDE:
J. Johansen (AU) Subatomic physic October 31th 2012 12 / 15
How?
CERN: ISOLDE:
J. Johansen (AU) Subatomic physic October 31th 2012 12 / 15
How?
CERN: ISOLDE: The setup:
J. Johansen (AU) Subatomic physic October 31th 2012 12 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 13 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 13 / 15
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
J. Johansen (AU) Subatomic physic October 31th 2012 14 / 15
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.
J. Johansen (AU) Subatomic physic October 31th 2012 15 / 15
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
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