1. Direct Reactions at Eurisol In the light of the TIARA+MUST2 campaign at GANIL B. Fernández-Domínguez

2. Physics Motivation Direct reactions are a unique tool to uncover and investigate new manifestations of nuclear structure of exotic nuclei B. Fernández-Domínguez -Inverse kinematics Detection: - light charged particles - gamma-rays - neutrons - beam-like particles Elastic and inelastic scattering -> nuclear and transition densities Transfer, knock-out and break-up reactions -> microscopic shell-structure EURISOL FW5 report : SCIENTIFIC CASE (Appendix A):

3. Array for light charged-particle and gamma-array measurements: GRAPA (Gamma-Ray And Particle Array) Instrumentation for Direct Reactions B. Fernández-Domínguez Charged Particles: (Particle Array ) Solid-angle of 4   x~0.1,0.5 mm and  θ ~ 1-5 mrad Large dynamic range with PID to Z=10 Gamma and fast charged particles : (Gamma Array) Solid-angle of 4  Best efficiency and resolution EURISOL FW5 report : INSTRUMENTATION (Appendix E): Updated version: http://ns.ph.liv.ac.uk/eurisol/spec_expts/M2.1_apparatus.pdf Integration of cryogenic and polarised targets. RIB

4. - SIMULATIONS: Modelling of a number of potential key experiments proposed, study different configurations etc… - IN-BEAM TEST TO VALIDATE DESIGN CHOICES : To asses the methodology and feasibility of the design concept. B. Fernández-Domínguez Preliminary design work required SIMULATIONS: Key experiments: 78 Ni(d,p) 79 Ni @ 10 MeV/u 132 Sn(d,p) 133 Sn @ 10 MeV/u 133 Sn 853.7 keV 1560.9 keV 1655.7 keV 2004.6 keV 3700 keV

5. Preliminary design work required: SIMULATIONS Target Thickness Particle Array: (energy and angular resolution) Gamma Array: Interaction Point B. Fernández-Domínguez Scintillating material : (CsI, LaBr 3 )

6. (d,p) with 20 O and 26 Ne beams at SPIRAL : Study of the N=16 shell gap B. Fernández-Domínguez Large step towards an integrated particle-gamma ray array. TIARA-MUST2 CAMPAIGN AT SPIRAL/GANIL September – November 2007 -Si-array ->Array of silicon detectors covering 90% of 4pi. MUST2 and TIARA -Ge-array->EXOGAM -Spectrometer ->VAMOS Results can be used to validate the design choices of the new EURISOL array Preliminary design work required: IN-BEAM TESTS 20 O-> Location of the d 3/2 state in Oxygen neutron rich isotopes 26 Ne->Reveal isomeric f 7/2 intruder that competes with sd ground state

7. Triple coincidences: Target-like particles – TIARA/MUST2 Beam-like particles - VAMOS Gammas - EXOGAM Trigger: hit in Si-detector B. Fernández-Domínguez Preliminary design work required: IN-BEAM TESTS TIARA silicon array VAMOS spectrometer GANIL radioactive beam - 20 O (SPIRAL) 10.9 A MeV CD 2 target 0.5 mg/cm 2 Detectors  E, E, TOF B ,  EXOGAM Gamma-ray array 10 4 pps MUST2 Si-CsI

8. TIARA: Inner and Outer Barrel +Hyball B. Fernández-Domínguez TIARA – Two Barrels: 8 detectors, x 4 longitudinal strips each. -Inner Barrel-> Energy, position. (  E~ 200 keV,  θ~1-2 deg ) -Outer Barrel- identification. (30-140 deg) - Hyball, 6 wedges, x16 rings (radial), x 8 sectors (azimutal) (  E~ 50 keV,  θ ~2 deg) (150-175 deg)

9. MUST2: 4 Telescopes of Si+CsI B. Fernández-Domínguez MUST2 4 telescopes of Si-CsI placed at forward angles. (0-30 deg) Si-Strip – 4 modules x128x128 Energy, position.  E~ 50 keV,  θ ~0.22 deg (pitch size 0.7mm at 180 mm) CsI- 4 modules with 4x4 crystals Identification  E-E

10. TIARA+MUST2 coupled to VAMOS B. Fernández-Domínguez Identification of the recoil VAMOS: Ionisation Chamber->  E Plastic ->E, TOF Drift Chambers ->X,Y, θ, 

11. TIARA+MUST2 coupled to VAMOS +EXOGAM B. Fernández-Domínguez Gamma detection with EXOGAM 4 Clovers @ 90 deg 15% photopeak efficiency @ 1.3 MeV

12. SPIRAL: RADIOACTIVE BEAM of 20 O: d( 20 O,p) 21 O  21 O +  B. Fernández-Domínguez Preliminary (on-line results) BOUND STATES (d,p) E (MeV) θ (degrees) g.s 1 st 1.28 MeV SIMULATION Geant4 θ (degrees) E (MeV) g.s

13. B. Fernández-Domínguez SPIRAL: RADIOACTIVE BEAM of 20 O: d( 20 O,p) 21 O  20 O + n θ (degrees) E (MeV) UNBOUND STATES (d,p) SIMULATION Geant4 E (MeV) θ (degrees) E (keV) Preliminary (on-line results)

14. Simulations reproduce response of arrays and give insight into the main parameters that contribute to performance Online analysis of the experiment confirms we can study different reactions channels, obtain level energies and l-values information The feasibility of the methodology is demonstrated. SUMMARY transfer to bound and unbound states with full channel identification triple coincidences with excellent gamma energy resolution also have (d,d’) and (d,t) acquired simultaneously with TIARA and MUST2 to include unbound states requires the large VAMOS angle/momentum bite type of experiments will be important to learn for the future array. FUTURE Increase efficiency of particle-gamma coincidences.. Gamma detection better efficiency, allow for fast-particle detection simultaneously Improve performance of particle array. (Energy resolution, low thresholds) Possibility to introduce cryogenic or polarised targets