Direct reactions at eurisol
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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

B. Fernández-Domínguez

Direct Reactions at Eurisol

In the light of the TIARA+MUST2campaign at GANIL


Physics motivation

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


Direct reactions at eurisol

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.


Direct reactions at eurisol

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


Direct reactions at eurisol

Preliminary design work required:SIMULATIONS

B. Fernández-Domínguez

Particle Array: (energy and angular resolution)

  • Target Thickness

  • Interaction Point

Gamma Array:

  • Scintillating material : (CsI, LaBr3)


Direct reactions at eurisol

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


Direct reactions at eurisol

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, 


Tiara inner and outer barrel hyball

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)


Must2 4 telescopes of si csi

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


Direct reactions at eurisol

B. Fernández-Domínguez

TIARA+MUST2 coupled to VAMOS

  • Identification of the recoil

  • VAMOS:

  • Ionisation Chamber->E

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


Direct reactions at eurisol

B. Fernández-Domínguez

TIARA+MUST2 coupled to VAMOS +EXOGAM

  • Gamma detection with

  • EXOGAM

  • 4 Clovers @ 90 deg

  • 15% photopeak efficiency @ 1.3 MeV


Direct reactions at eurisol

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)


Direct reactions at eurisol

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)


Direct reactions at eurisol

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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