1. Jean-Luc Lecouey, Seminar GOALS of meeting … Discuss status of available detector arraysDiscuss status of available detector arrays Discuss current developments (both here and elsewhere – DESPEC, …)Discuss current developments (both here and elsewhere – DESPEC, …) Identify technical “know-how” in different labsIdentify technical “know-how” in different labs Identify and define possible collaborations (FP7 ??)Identify and define possible collaborations (FP7 ??) Define goals, contributions, timelines, …Define goals, contributions, timelines, … NAO – Réunion 02/07

2. Jean-Luc Lecouey, Seminar Programme … Introduction + Goals, ideas, etc for a new array - Nigel OrrIntroduction + Goals, ideas, etc for a new array - Nigel Orr Status of DESPEC neutron detector array work - Daniel Cano OttStatus of DESPEC neutron detector array work - Daniel Cano Ott Two-neutron detection with TONNERRE - Miguel MarquésTwo-neutron detection with TONNERRE - Miguel Marqués Simulations using GEANT4 & MENATE - Brian RoederSimulations using GEANT4 & MENATE - Brian Roeder Status of the Neutromania project - Franck DelaunayStatus of the Neutromania project - Franck Delaunay Digital electronics developments at LPC - David EtasseDigital electronics developments at LPC - David Etasse Neutron detection at Bruyeres le Chatel - Xavier LedouxNeutron detection at Bruyeres le Chatel - Xavier Ledoux Discussion of how to go forward, interests and possible contributions from different labs, test experiments, etc Discussion of how to go forward, interests and possible contributions from different labs, test experiments, etc NAO – Réunion 02/07

3. Jean-Luc Lecouey, Seminar A New Low-Energy* Neutron Detector for the GANIL-SPIRAL-2 Community ? Available detector arrays + statusAvailable detector arrays + status Current developmentsCurrent developments TONNERRETONNERRE Future low-energy/  -xn arrayFuture low-energy/  -xn array NAO – Réunion 02/07 *  -xn, (d,n), (p,n), - direct reactions not addressed today but requirements very similar

4. Jean-Luc Lecouey, Seminar Neutron Detector Arrays Available within the French* GANIL-Based Community DEMON : ~96 liquid scintillator modules ( LPC, IRéS, UCL, ULB)DEMON : ~96 liquid scintillator modules ( LPC, IRéS, UCL, ULB) EDEN : ~40 liquid scintillator modules (IPNO)EDEN : ~40 liquid scintillator modules (IPNO) ToF  E n, granularity , Q  n-  discrimination ToF  E n, granularity  , Q  n-  discrimination number of hits x  x d  /d   M n number of hits x  x d  /d   M n TONNERRE : ~32 Plastic scintillator bars (LPC, Bucarest)TONNERRE : ~32 Plastic scintillator bars (LPC, Bucarest) ToF  E n, granularity +  t   ToF  E n, granularity +  t   ORION : large volume Gd-doped liquid scintillatorORION : large volume Gd-doped liquid scintillator * see also presentation by Xavier L. later today * see also presentation by Xavier L. later today

5. Jean-Luc Lecouey, Seminar STATUS of Neutron Detector Arrays Available within the French GANIL-Based Community DEMON : majority of modules still in reasonable conditionDEMON : majority of modules still in reasonable condition VXI + Daq no longer serviceable  future unclear EDEN : majority of modules still in good conditionEDEN : majority of modules still in good condition CAMAC limited lifetime, coupling with new Daq’s problematic  future unclear  future unclear TONNERRE : upgraded 16 modules/32 PMTsTONNERRE : upgraded 16 modules/32 PMTs VXI + GANIL-LPC Daq, VME under implementation VXI + GANIL-LPC Daq, VME under implementation  available but not well adapted to future facilities  available but not well adapted to future facilities ORION : “moth balled”ORION : “moth balled”

6. Jean-Luc Lecouey, Seminar Current Developments within the French GANIL-Based Community New generation (solid) scintillatorsNew generation (solid) scintillators  ANR : L. Stuttgé et al. (Strasbourg-Caen) see contribution by Franck D. New generation electronics-DAQNew generation electronics-DAQ  digital daq : D. Etasse et al. (LPC) [manpower – BDI requested] see contribution by David E. Exploratory studies/simulations & prototype expts (~2007-2008)Exploratory studies/simulations & prototype expts (~2007-2008)  EURISOL + SPIRAL-2 (LPC): breakup arrays +  -n,  -n-n …  EURISOL + SPIRAL-2 (LPC) : breakup arrays +  -n,  -n-n … see contributions by Brian R. & Miguel M.

7. Jean-Luc Lecouey, Seminar TONNERRE Array Up to 32 plasticscintillators [BC400, 160 x 20 x 4 cm, d=1.2 m ] Up to 32 plastic scintillators [BC400, 160 x 20 x 4 cm, d=1.2 m ] E n by TOF : 200 keV < E n < ~5 MeV E n by TOF : 200 keV < E n < ~5 MeV   45% of 4    45% of 4   E ( 1 MeV ): ~ 80 keV  E ( 1 MeV ): ~ 80 keV  ( 1 MeV ) ~ 50 %  ( 1 MeV ) ~ 50 % TONNERRE EXOGAM scintillators A. Buta et al., NIM A455 (2000) 412

8. Jean-Luc Lecouey, Seminar A. Buta et al., NIM A455 (2000) 412 TONNERRE : Detection Efficiency

9. Jean-Luc Lecouey, Seminar F Perrot et al., PRC74 (2006) TONNERRE @ ISOLDE : State-of-the-Art

10. Jean-Luc Lecouey, Seminar TONNERRE : Limitations … Neutron time-of-flight spectra :  -decay of 45 Cl 28 and 46 Cl 29 4000 2000 1500 1000 500 0 50100 150 200 250 300 time-of-flight (ns) number of counts 45 Cl 28 46 Cl 28 S. Grévy and the TONNERRE collaboration 2000 1000 800 600 400 200 0 50100 150 200 250 300 time-of-flight (ns) number of counts 46 Cl 29

11. Jean-Luc Lecouey, Seminar n-  discrimination  reduce backgrounds, enable  -2n,3n... detectionn-  discrimination  reduce backgrounds, enable  -2n,3n... detection  Liquid scintillators (or new solid scintillators) improve  E n and eliminate “tails” in TOF spectraimprove  E n and eliminate “tails” in TOF spectra  thin, small volume detectors with increased d flight lowest possible threshold in E nlowest possible threshold in E n  thin, small volume detectors + digital electronics cross-talk rejection  enable  -2n, 3n … detectioncross-talk rejection  enable  -2n, 3n … detection  modular, highly granular array + variable geometry high    identification of n-decay to excited stateshigh    identification of n-decay to excited states  large volume high efficiency Ge det’s (segmented ??) (conflict with need for high   n ) (conflict with need for high   n )  -Delayed Neutron Detection : “Ground Rules” for a Future Detector