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

10

100

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

10

100

1000

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

10

100

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]

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]

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

10

20

30

40

6 8 10 126 7 8 9 10 11 120.0

0.5

1.0

1.5

2.0

2.5

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

200

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)