The TMR network project “Development of γ-ray tracking detectors”

Lieder, R.M.; Gast, W.; Jäger, Herbert; Mihailescu, Lucian; Rossewij, M.; Eberth, J.; Pascovici, G.; Thomas, H. G.; Weißhaar, D.; Beck, F.A.; Curien, D.; Duchêne, G.; Pachoud, E.; Piqueras, I.; Alvarez, C. Rossi; Bazzacco, D.; Bellato, M.; Kroell, T.; Manea, C.; Quintana, B.; Venturelli, R.; Napoli, D. R.; Rosso, D.; Spolaore, P.; Geraci, A.; Pullia, A.; Ripamonti, G.; Camera, F.; Million, B.; Wieland, O.; Lisle, J.C.; Smith, A. G.; Well, Roland; Nolan, P.; Boston, Andrew; Cullen, D. M.; Descovich, M.; Enqvist, T.; Cederwall, B.; Ideguchi, E.; Marel, J. van der; Nyberg, J.; Herskind, B.; Sletten, G.; Wilson, J.S.; Henck, R.; Gutknecht, D.; Jaaskelainen, Kimmo

doi:10.1016/s0375-9474(00)00651-5

Cited by 24 publications

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“…In recent years several pilot projects in Europe [7] and the USA [2,3] have shown that the principle of γ -ray tracking is feasible by establishing experimentally that it is possible to determine the position of an interaction with sufficient accuracy over a range of energies from tens of keV to several MeV. The first phase of AGATA is to prove that a tracking array can be realized by designing and building a sub-array of detector modules (called the demonstrator) and measuring the tracking performance in actual experiments.…”

Section: Introductionmentioning

confidence: 99%

The AGATA Project

Simpson¹

2005

J. Phys. G: Nucl. Part. Phys.

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For decades, the study of the gamma-ray decay from quantal states of the atomic nucleus has played a pivotal role in discovering and elucidating a wide range of phenomena. Each major technical advance in gamma-ray detection devices has resulted in significant new insights into the structure of nuclei. To date, these advances have culminated in the construction of 4π arrays of escape-suppressed spectrometers. The global consensus of opinion is that the next major step in γ -ray spectroscopy involves abandoning the concept of a physical suppression shield and achieving the ultimate goal of a 4π Ge ball using the technique of γ -ray energy tracking in electrically segmented Ge crystals. The resulting spectrometer will have an unparalleled level of detection power for nuclear electromagnetic radiation. Its sensitivity for selecting the weakest signals from exotic nuclear events will be enhanced by a factor of up to 1000 relative to its predecessors. It will have an unprecedented angular resolution making it ideally suited for high-energy resolution even at recoil velocities up to 50% of the velocity of light. Therefore, it is ideally suited to be used in conjunction with the new generation of radioactive beam accelerators or existing stable beam facilities. In Europe, a collaboration has been established to construct a 4π tracking spectrometer called AGATA (advanced gamma tracking array). This collaboration has signed a Memorandum of Understanding for the first phase of the project to perform the research and development necessary to finalize the technology for gamma-ray tracking and hence fully specify the full 4π spectrometer. The status of this first phase of the AGATA project will be reported.

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Section: Introductionmentioning

confidence: 99%

The AGATA Project

Simpson¹

2005

J. Phys. G: Nucl. Part. Phys.

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“…The feasibility of γ-ray tracking has been the subject of extensive R&D performed in the last 7 years by GRETA [2] in the USA and the TMR network "Gamma Ray Tracking Detectors" [3] in Europe. The main lines of development are outlined in the following.…”

Section: Gamma-ray Tracking Methodsmentioning

confidence: 99%

The advanced gamma ray tracking array AGATA

Alvarez¹

2004

Braz. J. Phys.

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New accelerator facilities for radioactive-ion beams and high-intensity stable beams will start operation in a few years. Although these beams will provide interesting opportunities for exploring unknown territories of the nuclear landscape, the experimental conditions will be very challenging and, indeed, the nuclear structure community has realized that a new generation of powerful arrays for γ-ray spectroscopy has to be built in order to cope with them. As a result of years of experience with Compton suppressed germanium arrays and of intensive R&D work targeted to extend their limits, it is now clear that the next 4π γ-ray spectrometers will be built fully from germanium detectors and will be based on the technique of γ-ray tracking. The "Advanced GAmma Tracking Array" (AGATA), proposed in Europe, will be an instrument of major importance for nuclear structure studies at the very limits of nuclear stability. It will be built out of 120/180 highly segmented Ge crystals operated in position sensitive mode by means of digital data techniques and pulse shape analysis of the segment signals. AGATA will be able to measure γ radiation in a large energy range (from ∼ 10 keV to ∼ 10 MeV), with the largest possible photopeak effi ciency (25 % at Mγ = 30) and with a good spectral response. In particular, its very good Doppler correction and background rejection capabilities will allow to perform "standard" γ-ray spectroscopy experiments using fragmentation beams with sources moving at velocities up to β ∼ 0.5.

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“…Therefore by using the tracking technique one expects to improve the array sensitivity by about two orders of magnitude over the current generation of Ge-arrays. A wide European collaboration is now progressing in this way [15] . ... fig& A (ompton scattering event inside a Ge detector having three interaction points.Tracking ofthe gamma ray can be achieved through precise measurements of energy deposit and position at each interaction point.…”

Section: Radioactive Ion Beams and Gamma Spectroscopymentioning

confidence: 99%

The EUROBALL gamma ray detector array

Angelis

Bracco

Curien³

2003

Europhysics News

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T HE EUROBALL collaboration is a common effort of several European countries to provide a forefront experimental facility for nuclear structure research. Using composite germanium (Ge) counters, the EUROBALL detector is the prototype of a new generation of gamma-ray detector arrays that has set new limits to gamma-detector technology and provided a step forward both in basic research and in applications. As an example of application outside the nuclear physics domain we should mention the recent discovery by the NASA probe, Mars Odyssey, oflarge quantities of hydrogen that most probably is bound in water under the Mars surface. This evidence was obtained through neutron and gamma detection, the latter based on the EUROBALL detector technology (encapsulated "(-ray detectors)-see Fig. 1 [1].The Euroball array consists of 239 Ge crystals geometrically arranged in order to cover 45 % of the total solid angle. Technical details are reported in ref. [2]. Installed at two of the main nuclear structure facilities in Europe, at LNL (Legnaro-Italy) and at IReS-Vivitron (Strasbourg-France), see fig. 2, it has allowed the investigation of atomic nuclei at extreme conditions of angular momentum values and of proton/neutron ratios. This paper will give an overview of the research activities by selecting a number of examples. We, the authors, would like to dedicate this article to the memory of our IReS colleague and good friend Dr. lean-Pierre Vivien who has untimely and brutally passed away when this paper was under discussion. --, Why study nuclei at extreme conditions?The atomic nucleus is the paradigm ofa mesoscopic system (finite many-body system) of strongly interacting Fermions where quantal size effects play a central role. Renormalization effects for the nucleon-nucleon interaction are strongly boosted by making the system more polarizable, that is less bound. A detailed investigation of the nuclear structure of nuclei at extreme conditions, both at the limit of angular momentum and ofisotopic spin (neutron/proton ratio) where specific parts of the nuclear forces are strongly amplified, allows definitive tests to be carried out on the effective interaction acting between nucleons in nuclei. These studies provide the basis for a first principle description of the nuclear structure and are necessary to set stringent limits on fundamental symmetry-violation effects and on the lifetimes of rare processes. With an experimental sensitivity up to 10-5 of the production cross section, such as that ofEuroball, it has been possible to provide an unprecedented study of the nuclear properties under extreme conditions by addressing a number of problems concerning high spins and nuclei far from stability. Nuclear Structure at the limits of the angular momentumThrough the response of the nucleus to rotational stress one can investigate a wide varietyofnuclear structure phenomena showing the different facets of a finite fermionic system. In spite ofthe fact that rotating nuclei have been studied since the early 50's, many new pheno...

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The TMR network project “Development of γ-ray tracking detectors”

Cited by 24 publications

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The AGATA Project

The AGATA Project

The advanced gamma ray tracking array AGATA

The EUROBALL gamma ray detector array

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