olof tengblad, jra-04 dlepjoint eurisol - eurons town meeting, helsinki 2007 university of Århus,...

Joint EURISOL - EURONS Town meeting, Helsinki 2007Olof Tengblad, JRA-04 DLEP

University of Århus, Denmark H. Fynbo

CSIC, IEM, Madrid, Spain O. Tengblad

Chalmers University of TechnologyGöteborg, Sweden T. Nilsson

University of York, UK B.R. Fulton

ISOLDE-CERN

University of Jyväskylä, Finland A. Jokinen

Micron SemiconductorsUK http://www.micronsemiconductor.co.uk/

Acqirishttp://www.acqiris.com/

MESYTEC http://www.mesytec.de

Detection of Low Energy Particle

EURONS-JRA4 DLEP


DLEP - Physics motivation -decays of exotic nuclei

• -decays of drip-line nuclei

Many open channels with particle emission•Charged particles (p,d,t,6He,...)•Neutrons •Multiparticle emission (2-4n,2,2p...)

Often low energy ( < 1MeV)

Dedicated effort for Detection of Low Energy Particles from Exotic -decays


Region of interest: Light exotic Nuclei

• “Exact” A-body calculations possible for A12 – Shell-model states– Molecular-cluster states

• We can cover from drip-line to drip-line• Break-up mechanism not fixed by

kinematics– Sequential?– Direct?

• Crucial for bridging the – A=5 and A=8 gaps in Big Bang and

Stellar nuclear synthesis.

12C & The triple alpha process4He + 4He ↔ 8Be

8Be + 4He ↔ 12C + γ + 7.367 MeV

clustering


9B* p Be

break-up mechanism: -clustering?

Li

p

9C

9Li

+

-


ISOL beam• Low energy isotope

separated beam• Can be stopped in C-foil • Well-defined source

– Segmented Si-Detectors• Large Solid Angle

– detect all particles• High Segmentation

– no summing

-decay experiments


Reaction studies @ tandem in Madrid3He + 10B 12C* p + + +

R. Raabe

H. Fynbo

12C

O. Tengblad

12N/B

12N/B


Triple coincidence in the decay of 12N

H. Fynbo et al., Revised rates for the stellar triple-process from measurements of 12C nuclear resonances Nature 433 (2005) 136

C.Aa. Diget et al., Properties of the 12C 10 MeV state determined through β-decay, Nucl.Phys. A 760(2005)3-18


Reaction studies @ tandem in Madrid

3He @ 2.45 MeV10B 13N*

p

12C*

+

9B*

17 mg/cm2


Ei() (MeV)

Esum

=3/2*E1+0.092 MeV

E12

C (

MeV

)p + + + coincidences Excitation Energy in 12C reconstructed

12C*

8Be(0+)

E

We can deduce the partial branching ratios for each level in 12C* via the 0+ and 2+ states in 8Be

INPC2007


Task & deliverables

•Design and prototyping of Detectors & Front end electronics for low energy Charged particle detection

• Algorithms for digital particle identification


Detectors – ultra thin window

200 nm Al400 nm doping

New design100 nm dopingGrid contact

100 nm dead layer

60 m no response

Developed in cooperation with our industrial partner Micron Semiconductor


E stage 1 µmE stage 400 ± 15 µm

Detectors - monolithic Si telescope

64 detector elements á 7 mm2

128 readout channels multiplexed to 1 ADC.

Solid Angle 20% of the DSSSD

BUT! 4 times more electronic channels

256 detector elements á 9 mm2

32 readout channels

EE


Detector delivered August 2007

64 monolithic telescopes 128ch on 5x5cm2

Side view with connectorsArea 64x 7mm2, E 1m, E 400 m

Doped & cut Si-wafer from SGS-THOMSON -Catania, detector assembly by DLEP and industrial partner MESYTEC


Complete readout electronic

Delivered August 2007developed for DLEP by MESYTEC64 ch:

PA + TFA + CFD + A + triggerAnalogue & multiplexed

MDI-2 VME sequencer and ADChandles 512 multiplexed channels

4x 16ch cards

In big production; estimated cost

of complete readout chain 70 €/ch

½ liter 256 ch

256 ch

10M samples/bus12 bit ADC

Incorporated into the MIDAS DAQby Vic Pucknel, RAL Daresbury


Charged particle spectrum

IS417 ISOLDE 28 Sep- 5 Oct 11Li beta decay channels


Task & deliverables

•Design and prototyping of Detectors & Front end electronics for low energy Charged particle detection

• Algorithms for digital particle identification


PSD – Poster P2 and P7

The WavePro 7000A 4 input channels1GHz bandwidth 20GS sampling frequency


Pulse rise time vs Amplitude


Neural Network Analysis Poster P7


Collaborators

• H.O.U. Fynbo, C. Aa. Diget, S.G. Pedersen, K. Riisager, Department of Physics and Astronomy, Århus University, Denmark

• K. Riisager, L.M. Fraile, , H. Jeppesen ISOLDE, EP-Division, CERN, Geneva, Switzerland

• B. Jonson, T. Nilsson, G. Nyman, H. Johansson Fundamental Physics, Chalmers Univ. of Technology, Göteborg, Sweden

• J. Äystö, W. Huang, J. Huikari, A. Jokinen, P. Jones, Department of Physics, University of Jyväskylä, Finland

• B. Fulton, P. Joshi, S.Fox

University of York, United Kingdom.

• M.J.G. Borge, M. Madurga, M. Alcorta, D. Galaviz , O. Tengblad, M. Turrion Instituto Estructura de la Materia, CSIC, Madrid, Spain

• R. Raabe

• P. Dendooven• I. Martel, J.L. Flores, P. Salmerón Universidad de Huelva, Sapin

olof tengblad, jra-04 dlepjoint eurisol - eurons town meeting, helsinki 2007 university of Århus,...

Documents

olof tengblad

mev clustering slide

nb slide

inpc2007 slide

particles p

c nuclear resonances

low energy isotope

mev state