present time : DEMON, TONNERRE, EDEN, HENDES, LAND, ORION, … neutron wall

Neutron detection

good neutron detection arrays but

- often compromise (intrinsic efficiency, energy range, angular resolution,...)- become old

- incompatible with safety rules

DEMON

+ 13 years old 1st experiment: 1994

organic liquid component (NE213): dangerous

VXI electronics: expensive and obsolete

very good performances

Détecteur Modulaire de Neutrons(modular neutron detector)

Détecteur Modulaire de Neutrons

~100 cells: liquid scintillators NE213

L=20cm, =16 cm

n- discrimination :

- pulse shape analysis : Qtot-Qlent

- separation with time of flight

E t (t~1.2 ns)

, scintillator position

cross-talk < 1%

very high intrinsic efficiency

modular detector

SYREP: proton rejection system 45 thin scintillators (3 mm)

n < 0.5%

- electronics: VXI standard - independent acquisition system

n- discrimination :

- pulse shape analysis: Qtot-Qlent

- separation with time of flight

Détecteur Modulaire de Neutrons

Détecteur Modulaire de Neutrons

Détecteur Modulaire de Neutrons

… and very resistant !

+ 10 years old 1st experiment: 1994

organic liquid component (NE213): dangerous

VXI electronics: expensive and obsolete

very good performances

CYCLONE, Louvain-la-neuve

GANIL, Caen

SARA, Grenoble

VIVITRON, Strasbourg

U400, JINR, Dubna

TANDEM, Catane

K500, Texas A&M, College Station

SATURNE, Saclay

TSL, Uppsala

KVI, Groningen

JYFL, Jyväskylä… and widely used ! Dynamics of dissipative reactions at intermediate energies

many domains investigated in physics:

Capture dynamics at low energy in the heavy and superheavy mass region

Structure of light neutron rich nuclei

Transmutation of nuclear waste

….

- existing material used for the neutron detection:

- liquids: NE213 dangerous

cannot be used under vacuum

- cristals: anthracen - stilben very expensive

response = function of incident angle

difficult to manufacture big volumes- polymers: plastics no n- discrimination

- no new development since 1970’s !

projects …?

- origin of the discrimination (fluorescence) not well understood

from DEMON

2 steps:

answer: end 2007 …

2- construction a new detector(s)

- solid or liquid

- digitised electronics (~ ok)

SATAN ….?

ANR "Neutromania" (French Ministry of Research)

start of project: 05.12.05

duration 24 months

collaboration: IPHC-ISMRA-CEA

physicists + chemists

1- development of a new component - solid

- performances ≥ DEMON (n- discrimination, …)

Neutromania

to SATAN

S.. A.. T.. A.. Neutrons

Who is interested ?

- AZ4 collaboration: SATAN (> 1000 cells)

neutrons

E of LCP

- DEMON collaboration

- … ?

J. Pluta, F. Hanappe et al, GANIL, 1998

Interferometry (n,n), (p,p), (n,p)40Ar + 58Ni, 78 A.MeV

DEMON = belgian-french detector

collaboration: - ULB Brussels

- UCL Louvain-la-neuve

- LPC Caen

- IPHC Strasbourg

begin, 1994: many people

2007: very few people…

Neutromania (NT05-2_43664 /ANR-05-BLAN-0190-01)

- title: Neutron detection for science, industry, security and space

- grant: 190 k€

- duration: 24 months (dec. 2005-dec. 2007)

- partners: - IPHC-Strasbourg: - L.Stuttgé, O.Dorvaux, J.Devin (IPHC: nucl. phys.)

- J.M.Jung, R.Barillon (IPHC: nucl. chem.)

- L.Douce (IPCMS: chem.)

- E.Bouajila (PD: chem.)

- ISMRA-Caen: - M.Marqués, B.Tamain (LPC: nucl. phys.)

- T.N.Pham, P.J.Madec (LCMT: chem.)

- T. Dalet (PD: chem.)

- CEA-Saclay: - S.Normand, P.Delacour, B.Bazin (Dép. des Techn. du Capt. et du Signal: phys.)

- V.Simic, P.Raimond (Laboratoire Cellules et Composants: chem.)

- M.Hamel (PD: chem.)

- consulting persons: - F.Hanappe (nucl. phys. + chem.) (ULB, Brussels)

- F.Tondeur (appl. of detection) (ISIB, Brussels)

Neutromania (NT05-2_43664 /ANR-05-BLAN-0190-01)

- job description: develop a new scintillating material

1) - solid

- discriminating n-

- fast (fast component ~ 1 ns)

- good quantum efficiency

- transparent to its own emitting light

2) - usable under vacuum

- easy to polish

- cheep

synthesis of polymers presenting numerous multiple delocated bonds

able to excite triplet states which allow the n- discrimination

chemical characterisation composition, nature, length of the chain, molecular weight, boiling point,

emission and absorption spectra , … physical characterisation (Cf source, 4MV acc., …) discrimination, resolution, efficiency,…

new component

thickness: ~5 mm

new component

thickness: ~5 mm

First results

NE213

thickness: 5 cm

we need ~1 year more to finalize

thickness: 5 cm

NE213

AmBe source

Qslow

Qtot

thickness: 20 cm

NE213

DEMON

AmBe source

Qslow

Qtot

thickness: 20 cm

NE213

DEMON

What about electronics ?

future detector(s) digitised electronics

What do we need to measure ?

pulse shape discrimination n- total and slow/fast charge energy time of flight

electronics group of Strasbourg

TNT and TNT2 cards dedicated to spectroscopy

development dedicated to neutrons

n- discrimination: has been tested in Caen and in Strasbourg

no major problem

time of flight: some development necessary

electronics group of Caen

development of digitised electronics