First simulations of FAZIA

Napoli 3-5 September 2007

Technical requirements for the physics of FAZIA• Dynamics and EOS observables @ EURISOL

AIMF , b

4, pulse shape ( high granularity)

• Exotic states @ SPIRAL/SPIRAL2

high-resolution charged particle correlations

high granularity, |k| resolution

• Evaporation, level densities @ SPIRAL/SPIRAL2

A1 , E*

4, pulse shape ( high granularity), low thresholds, coupling with spectrometers, neutron detectors

•…….And the other physics cases of the proposal, for further study……

Very adaptable geometry (beams, detectors)

Simulation• Geometry :

• INDRA

• INDRA4 (~ Chimera)

• INDRA16 (FAZIA?) Configuration for test: 2 arrays in 2 chambers :

Spherical array +• Surrounded by neutron detectors?

Annular array• High granularity (strips?)• Replaceable with a spectrometer

Target

Beam

Neutron detector ?

Simulation• Options for the detector :

• A up to element Zn, otherwise EPAX

• |k| with uncertainty 5%

• Double hits A, K adds

• 4 neutron detectors: efficiency (~20%), |kn| with uncertainty 15%

• Geometric coverage ~ 87%

INDRA[deg]

[d

eg]

36Ar+58Ni 12 A MeV Select

c.n. 94Pd at 241 MeV, 1.8 cm/ns (lab)

129Xe+Sn 50 A MeV Select

q.p. 120Sn at 400 MeV, 9 cm/ns (lab)

INDRA

Simulation

Simulation• Reactions :

• GEMINI

12C+24Mg 100 A MeV Select 12C at 30 MeV, 5.3 cm/ns (lab)

36Ar+58Ni 12 A MeV Select c.n. 94Pd at 241 MeV, 1.8 cm/ns (lab)

129Xe+Sn 50 A MeV Select q.p. 120Sn at 400 MeV, 9 cm/ns (lab)

!!! : Too good agreement with EPAX

• HIPSE

58Ni+58Ni / 68Ni+68Ni 40 A MeV q.p. + q.t.

112Sn+112Sn / 132Sn+132Sn 40 A MeV q.p. + q.t.

• QMD

58Ni+58Ni / 68Ni+68Ni 150 A MeV q.p. + q.t.

112Sn+112Sn / 132Sn+132Sn 150 A MeV q.p. + q.t.

Charged-particle correlations @ SPIRAL/SPIRAL2

Nuclear structure in exotic (non-Weißkopf) decays:

Probing excited heavy cluster states

12C decays in Li+Li

|k| perfectly measured:

•INDRA: not adapted

•INDRA4: main peak

•INDRA16: 2 peaks

12C+24Mg 100 A MeV

Select 12C at 30 MeV, 5.3 cm/ns (lab)

|k| with uncertainty 0%, 2%, 5%

IN

DR

A

I

ND

RA

4

IND

RA

16

Forward angles

|k| is measured with an uncertainty

|k| with uncertainty 0%, 2%, 5%

IN

DR

A

I

ND

RA

4

IND

RA

16

Backward angles

|k| is measured with an uncertainty

Dynamics and EOS observables @ EURISOL

• Etrans12 measured precisely with any granularity INDRA

Correspondence with b (from the model)

N/Z of IMF as a function of Etrans12

• A up to Z3: not adapted

• A up to Z28 (all IMF identified): resolved

• Small Etrans12 may suffer from the hole of the beam

Dynamics and EOS observables @ EURISOL

Average neutron spectra (preliminary)

• Neutron multiplicity by AZ in complete events

• Mean neutron spectrum measured with a surrounding array, to be defined

Average neutron spectra (preliminary)

Conclusions

FAZIA simulator

• Geometric options: OK

• More detailed detector properties: Next

Physics cases model simulations filtering solutions for FAZIA

Dynamics & EOS@ EURISOL

AIMF , b 4, pulse shape up to Zn ( high granularity)

Exotic states @ SPIRAL1/2 correlations Granularity INDRA16, very high |k| resolution

Evaporation, level densities @ SPIRAL1/2

A1 , E* 4, pulse shape, low thresholds, n detector, spectrometer

………………………