Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 University of Århus, Denmark H. Fynbo CSIC, IEM, Madrid, Spain O. Tengblad Chalmers University of Technology Göteborg, Sweden T. Nilsson University of York, UK B.R. Fulton ISOLDE-CERN University of Jyväskylä, Finland A. Jokinen Micron Semiconductors UK Acqiris MESYTEC Detection of Low Energy Particle EURONS-JRA4 DLEP

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 DLEP - Physics motivation  -decays of exotic nuclei  -decays of drip-line nuclei  Many open channels with particle emission Charged particles (p,d,t,  6 He,...) Neutrons Multiparticle emission (2-4n,2 ,2p...)  Often low energy ( < 1MeV) Dedicated effort for Detection of Low Energy Particles from Exotic  -decays

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Region of interest: Light exotic Nuclei “Exact” A-body calculations possible for A  12 –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. 12 C & The triple alpha process 4 He + 4 He ↔ 8 Be 8 Be + 4 He ↔ 12 C + γ MeV  clustering

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki B* p   Be  break-up mechanism:  -clustering?      Li   p 9C9C 9 Li ++ --

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

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Reaction tandem in Madrid 3 He + 10 B  12 C*  p +  +  +  R. Raabe H. Fynbo 12 C O. Tengblad 12 N/B

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Triple coincidence in the  decay of 12 N H. Fynbo et al., Revised rates for the stellar triple-  process from measurements of 12 C nuclear resonances Nature 433 (2005) 136 C.Aa. Diget et al., Properties of the 12 C 10 MeV state determined through β-decay, Nucl.Phys. A 760(2005)3-18

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Reaction tandem in Madrid MeV 10 B 13 N * p 12 C * + 9B*9B*  17 mg/cm 2 

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 E i (  ) (MeV) E sum =3/2*E MeV E 12C (MeV) p +  +  +  coincidences  Excitation Energy in 12 C reconstructed 12 C *  8 Be(0 + )   EE We can deduce the partial branching ratios for each level in 12 C* via the 0 + and 2 + states in 8 Be INPC2007

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Task & deliverables Design and prototyping of Detectors & Front end electronics for low energy Charged particle detection Algorithms for digital particle identification

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Detectors – ultra thin window  200 nm Al 400 nm doping New design 100 nm doping Grid contact 100 nm dead layer 60  m  no  response Developed in cooperation with our industrial partner Micron Semiconductor

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007  E stage 1 µm E stage 400 ± 15 µm Detectors - monolithic Si telescope 64 detector elements á 7 mm readout channels multiplexed to 1 ADC. Solid Angle 20% of the DSSSD BUT! 4 times more electronic channels 256 detector elements á 9 mm 2 32 readout channels EE E

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Detector delivered August monolithic telescopes  128ch on 5x5cm 2 Side view with connectors Area 64x 7mm 2,  E 1  m, E 400  m Doped & cut Si-wafer from SGS-THOMSON -Catania, detector assembly by DLEP and industrial partner MESYTEC

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Complete readout electronic Delivered August 2007 developed for DLEP by MESYTEC 64 ch: PA + TFA + CFD + A + trigger Analogue & multiplexed MDI-2 VME sequencer and ADC handles 512 multiplexed channels 4x 16ch cards In big production; estimated cost of complete readout chain 70 €/ch ½ liter 256 ch 10M samples/bus 12 bit ADC Incorporated into the MIDAS DAQ by Vic Pucknel, RAL Daresbury

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Charged particle spectrum IS417 ISOLDE 28 Sep- 5 Oct 11 Li beta decay channels

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Task & deliverables Design and prototyping of Detectors & Front end electronics for low energy Charged particle detection Algorithms for digital particle identification

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 PSD – Poster P2 and P7 The WavePro 7000A 4 input channels 1GHz bandwidth 20GS sampling frequency

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Pulse rise time vs Amplitude

Olof Tengblad, JRA-04 DLEPJoint EURISOL - EURONS Town meeting, Helsinki 2007 Neural Network Analysis Poster P7

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