The AGATA project

concept of - ray tracking

design and development

Witek Męczyński

The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland

North-East European Network meeting, September 14– 15, Kraków

Joint Resaearch Activity (EURONS)

Advanced GAmma Tracking Array

for - ray spectroscopy under extreme conditionsin a very large energy range with high efficiency

and very good spectral respons

Concept of - ray tracking

~ 0.4

~ 0.8

~ 0.8

EUROBALL

MODEL

AGATA

limited det. efficiency;poor en. resolution

at high recoil velocity

too many detectors are needed to avoid

summing effects

segmented detectors;interaction points of all -rays are determined;

full energy of every -ray is reconstructed

Design and development

36-fold segmented Ge detector Triple cluster module

encapsulated in Aluminium can

Position sensitivity obtained by Pulse Shape Analysis of the real

signal from a segment and induced signals in its neighbours.

Position determination in 3D: < 5 mm

1 - 3 encapsulated det. in a common cryostat2 - preamps3 - frame support4 - digital pulse procesing electronics5 - fibre-optic channel for data transfer6 - LN2 dewar7 - target

hexagonal tapered shapemax. diam. 80 mm, length 100 mm

Tracking Algorithms use the results of PSA for reconstruction

of the individual -rays

AGATA 4- array

Sensitivity: 107

180 hexagonal crystals in 60 single clusters

Major improvements in:

12 pentagonal crystals individually canned6 780 segments! 230 kg of high purity germaniuminner(outer) radius: 17(26) cmsolid angle coverage: 77 %

Efficiency (E=1 MeV): 50% (M=125%

(M=30)Angular resolution: 1o

FWHM (1 MeV, v/c=50%): ~ 5 keV !

Rates: 3 MHz (M=1), 0.3 MHz

(M=30)

~ 8 years, completed in 2007/9

Array:

Cost ~40 M€, Effort ~150 MY

Construction:

Joint Research Activity: objectives of the project

demonstration of the new technology with a small AGATA sub-array:

objectives of the project and the EU contribution:

development, construction, commissioning and evaluationof the prototype AGATA moduleand associated electronics

set of tracking modules withdigital pulse-processing electronics,data acquisition systemand ancillary detectors for performance evaluation

starting date: January 1, 2005, duration: 4 years

Joint Research Activity: management of the project

Memorandum of Understanding: to develop, fund, construct and operate an AGATA demonstratrion array to form a research network to investigate novel aspects of nucl. structure

41 institutions and laboratories from 11 European countries

Organisation of the AGATA project:

AGATA Steering Committee AGATA Manegement Board AGATA Working Groups

Detector ModuleLocal Level ProcessingGlobal Level ProcessingDesign&InfrastructureAncillary DetectorsData AnalysisEU Contact

Poland

Joint Research Activity: Polish contribution to the project

Heavy Ion Laboratory, Warsaw University

Research team:

The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Kraków

Global Level ProcessingData AnalysisAncillary Detectors

Institute of Experimental Physics, Warsaw University

The Andrzej Sołtan Institute for Nuclear Studies, Świerk

Institutions:

Working groups:

8 persons

Contributed effort: 6 men-years