H.-W. Becker, NUPECC Small Scale Facilities workshop, 7./8. Sep. 2007
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Transcript of H.-W. Becker, NUPECC Small Scale Facilities workshop, 7./8. Sep. 2007
Activities and Opportunitiesat the accelerator labin Bochum
H.-W. Becker, NUPECC Small Scale Facilities workshop, 7./8. Sep. 2007
Sputter Ion Source I20 pµA 4MV
Dynamitron Tandem
AcceleratorRUB
Ion beam Purification
Singlett
60° Dipol magnet
E-E Telescope
Doublett Analysing magnet
Wien-Filter
Wien-Filter
magnetic
Quadrupols
Triplett
Side FC
Wien-Filter
4He Gas target
Recoil Focussing
Wien-Filter
Recoil Separation
Experiment – 12C(,)16O BochumRecoil Mass Separator ERNA
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
100
1000
S [ke
V-b
]
Ecm
[MeV]
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
100
1000
S [ke
V-b
]
Ecm
[MeV]
E1
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
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1000
S [ke
V-b
]
Ecm
[MeV]
E1E2
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
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S [ke
V-b
]
Ecm
[MeV]
E1E2
Kaskaden
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
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1000
S [ke
V-b
]
Ecm
[MeV]
E1E2
Kaskaden
total
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
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1000
S [ke
V-b
]
Ecm
[MeV]
E1E2
Kaskaden
total
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
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1000
S [ke
V-b
]
Ecm
[MeV]
E1E2
Kaskaden
total
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
100
1000
S [ke
V-b
]
Ecm
[MeV]
total
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
100
1000
S [ke
V-b
]
Ecm
[MeV]
total
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.01
10
100
1000
S [ke
V-b
]
Ecm
[MeV]
total
R-MatrixcalculationKunz et al.Ap.J. 567 (2002) 643
E1/E2 DataStuttgart-Exp.Fey et al.(to be published)Karlsruhe BaF2-Ball
DRAGONTRIUMFMatei et al.PRL 97 (2006) 242503
newcompleteR matrixcalculation
Experiment – 12C(,)16O BochumRecoil Mass Separator ERNA – Results
0.0 0.5 1.0 1.5 2.0 2.5
0
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20
30
40
6 8 10 126 7 8 9 10 11 120.0
0.5
1.0
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3.0
Depth (mm)
Data, 30 EC, 0.25 Hours Data, 30 EC, 0.50 Hours Data, 30 EC, 0.75 Hours H
Co
nce
ntr
atio
n (
mm
ol/c
m3 )
Beam Energy (MeV)
Cts
/Ch
arg
e
6.4 6.5 6.6 6.7 6.8 6.9 7.00.0
0.5
1.0
1.5
2.0
2.5
3.0
Astrophysics with the Summing Crystal
summing over cascades:
4-Geometry – summing over angular distribution
Example: 88Sr(p,)89Y(important for p-process)
88Sr(NO3)2-Target
Results:
A. Spyrou, H.-W. Becker, A. Lagoyannis, S. Harissopulos and C. Rolfs, Phys. Rev. C, in print
“seed “ abundances
s process
p-nuclei abundances
p process
reaction
network
The game of understandingp-process abundances
High Resolution Depth Profiling with Low Energy Nuclear Resonances:
0
500
1000
1500
2000
2500
3000
3500
4000
4500
415.8 416 416.2 416.4 416.6 416.8 417 417.2
proton energy
yiel
d
Lewis-peak
beam resolution: 30-40 eVtotal resolution eV(mainly doppler broadening)
1 nm
Ep = 417 keVResonance in 29Si
stability test
50
100
150
200
250
300
0 10 20 30 40 50 60 70
time [min]
gam
ma y
ield
at
50
% p
oin
t
20 eVstability:
500 kV machine
Investigation of Diffusion Processes in Minerals
nativesample
artificial layerenriched in 29Si(PLD)
Olivin(Fe,Mg)2SiO4
Diopside layer on Olivine
0
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400
600
800
1000
415 420 425 430 435 440
energy [keV]
cou
nts
High Energy Ion ProjectionHigh Energy Ion Projection
field strength:field strength: 14 T14 TMxE product: MxE product: 100 100 MeV u/qMeV u/q22
demagnification: demagnification: 15 15 mask area:mask area: Ø Ø 30 30 mmmmresolution (PMMA):resolution (PMMA): 0.3 0.3 mmm m (0.6 MeV Si)(0.6 MeV Si)
Nitrogen -VacancyNitrogen -Vacancy (NV) (NV)center fabrication center fabrication in type IIa diamondin type IIa diamond
105 N104 N103 N
2 MeV N implantation + annealing 10 µm
Approx. 1-2 N iones/ N-V defect
Meijer et al. APL 87 (2005)