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B. Fern ández-Domínguez. Direct Reactions at Eurisol. In the light of the TIARA+MUST2 campaign at GANIL. B. Fern ández-Domínguez. Physics Motivation. EURISOL FW5 report : SCIENTIFIC CASE (Appendix A):.

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Direct Reactions at Eurisol

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B. Fernández-Domínguez

Direct Reactions at Eurisol

In the light of the TIARA+MUST2campaign at GANIL


B. Fernández-Domínguez

Physics Motivation

EURISOL FW5 report : SCIENTIFIC CASE (Appendix A):

Direct reactions are a unique tool to uncover and investigate new manifestations of nuclear structure of exotic nuclei

  • Elastic and inelastic scattering -> nuclear and transition densities

  • Transfer, knock-out and break-up reactions -> microscopic shell-structure

  • Inverse kinematics

  • Detection:

  • light charged particles

  • gamma-rays

  • neutrons

  • beam-like particles


Instrumentation for Direct Reactions

B. Fernández-Domínguez

EURISOL FW5 report : INSTRUMENTATION (Appendix E):

Array for light charged-particle and gamma-array measurements: GRAPA(Gamma-Ray And Particle Array)

Updated version: http://ns.ph.liv.ac.uk/eurisol/spec_expts/M2.1_apparatus.pdf

  • 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

RIB

  • Gamma and fast charged particles : (Gamma Array)

Solid-angle of 4

Best efficiency and resolution

Integration of cryogenic and polarised targets.


Preliminary design work required

3700 keV

2004.6 keV

1655.7 keV

1560.9 keV

853.7 keV

133Sn

B. Fernández-Domínguez

- 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.

SIMULATIONS:

  • Key experiments:

  • 78Ni(d,p)79Ni @ 10 MeV/u

  • 132Sn(d,p)133Sn @ 10 MeV/u


Preliminary design work required:SIMULATIONS

B. Fernández-Domínguez

Particle Array: (energy and angular resolution)

  • Target Thickness

  • Interaction Point

Gamma Array:

  • Scintillating material : (CsI, LaBr3)


Preliminary design work required:IN-BEAM TESTS

B. Fernández-Domínguez

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

Large step towards an integrated particle-gamma ray array.

Results can be used to validate the design choices of the new EURISOL array

(d,p) with 20O and 26Ne beams at SPIRAL : Study of the N=16 shell gap

20O-> Location of the d3/2 state in Oxygen neutron rich isotopes

26Ne->Reveal isomeric f7/2 intruder that competes with sd ground state


Preliminary design work required:IN-BEAM TESTS

B. Fernández-Domínguez

EXOGAM

Gamma-ray array

MUST2

Si-CsI

VAMOS

spectrometer

GANIL radioactive beam

- 20O (SPIRAL) 10.9 A MeV

104 pps

TIARA

silicon array

Triple coincidences:

Target-like particles – TIARA/MUST2

Beam-like particles - VAMOS

Gammas - EXOGAM

Trigger: hit in Si-detector

CD2 target

0.5 mg/cm2

Detectors

E, E, TOF

B, 


B. Fernández-Domínguez

TIARA: Inner and Outer Barrel +Hyball

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)


B. Fernández-Domínguez

MUST2: 4 Telescopes of Si+CsI

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


B. Fernández-Domínguez

TIARA+MUST2 coupled to VAMOS

  • Identification of the recoil

  • VAMOS:

  • Ionisation Chamber->E

  • Plastic ->E, TOF Drift Chambers ->X,Y,θ,


B. Fernández-Domínguez

TIARA+MUST2 coupled to VAMOS +EXOGAM

  • Gamma detection with

  • EXOGAM

  • 4 Clovers @ 90 deg

  • 15% photopeak efficiency @ 1.3 MeV


E (MeV)

g.s

1st 1.28 MeV

(d,p)

θ (degrees)

BOUND

STATES

E (MeV)

SIMULATION

Geant4

g.s

θ (degrees)

B. Fernández-Domínguez

SPIRAL: RADIOACTIVE BEAM of 20O: d(20O,p)21O  21O +

Preliminary (on-line results)


E (MeV)

(d,p)

θ (degrees)

UNBOUND

STATES

E (MeV)

SIMULATION

Geant4

E (keV)

θ (degrees)

B. Fernández-Domínguez

SPIRAL: RADIOACTIVE BEAM of 20O: d(20O,p)21O  20O +n

Preliminary (on-line results)


SUMMARY

  • 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.

  • 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


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