C. Cattadori - Academia.edu (original) (raw)

Papers by C. Cattadori

Physics Letters B, 1992

The GALLEX result 83 ± 19 (stat.) ± 8 (syst.) SNU is two standard deviations below the prediction... more The GALLEX result 83 ± 19 (stat.) ± 8 (syst.) SNU is two standard deviations below the predictions of stellar model calculations (124–132 SNU). To fit this result together with those of the chlorine and Kamiokande experiments requires severe stretching of solar models but does not ...

Journal of High Energy Physics

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) o... more The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the RO...

International Journal of Modern Physics: Conference Series

An observation of neutrinoless double beta ([Formula: see text]) decay would allow to shed light ... more An observation of neutrinoless double beta ([Formula: see text]) decay would allow to shed light onto the nature of neutrinos. Gerda (GERmanium Detector Array) aims to discover this process in a background-free search using [Formula: see text]Ge. The experiment is located at the Laboratori Nazionali del Gran Sasso (LNGS) of the Istituto Nazionale di Fisica Nucleare (INFN) in Italy. Bare, isotopically enriched, high purity germanium detectors are operated in liquid argon. Gerda follows a staged approach. In Phase II 35.6 kg of enriched germanium detectors are operated since December 2015. The application of active background rejection methods, such as a liquid argon scintillation light read-out and pulse shape discrimination of germanium detector signals, allows to reduce the background index to the intended level of [Formula: see text] cts/(keV⋅kg⋅yr). No evidence for the [Formula: see text] decay has been found in 23.2 kg⋅yr of Phase II data, and together with data from Phase I the...

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

A charge-sensitive preamplifier showing very low power consumption was developed in two versions:... more A charge-sensitive preamplifier showing very low power consumption was developed in two versions: the first using a JFET SNJ903L has a matching capacitance of 310 pF whereas the second one employing a SNJ3600L has 1100 pF. Both versions have a charge sensitivity of 8 muV/e-. The rise time is lower than 200 ns for both low and high capacitance versions at an input capacitance of 1000 and 3000 pF respectively. The low capacitance version has an equivalent noise charge of 220 e- rms at 0 pF for a CR-(RC)2 shaping at 10 mus shaping time. The noise at 1 mus is 510 e- rms at 0 pF and the noise slope is 1.59 e-/pF. The high capacitance version exhibits 400 e- rms at 0 pF and 10 mus shaping time. At 1 mus the equivalent noise charge is 1100 e- rms and the noise slope is 0.91 e-/pF. The second stage uses operational amplifiers of 16 MHz gain-bandwidth product and is prepared to make a differentiation with pole-zero cancellation if required. The final stage provides a differential output with 50 omega output impedance and can drive a 100 omega twisted pair cable loaded with its characteristic impedance. The total power dissipation is 190 mW for the SNJ903L version whereas the SNJ3600L version dissipates 265 mW. Both versions use +/-6 V. The circuit is mounted using thick film technology onto a 20×50 mm2 ceramic substrate. The project is complemented with the design of a 3000 V, 24 pF/m coaxial cable for detector biasing and signal transport with minimum contribution to the ENC.

Nuclear Physics B - Proceedings Supplements

Il Nuovo Cimento C

The GALLEX collaboration is performing an experiment for the detection of neutrinos coming princi... more The GALLEX collaboration is performing an experiment for the detection of neutrinos coming principally from the p-p fusion reaction in the Sun, via the reaction Ve + 7'Ga-' ~lGe-t-e-. The experiment is running in the Gran Sasso Underground Laboratory of INFN, using as a target 30.3 tons of gallium in the form of 8.13 molar aqueous GaC13 solution. A report is given of the status of GALLEX after the end of the operations devoted to the removal from the solution of the cosmogenically formed Ge isotopes, completed in the middle of 1991. The experiment is now collecting data on solar neutrinos and the data analysis is in progress. Preliminary results concerning the first year of measurement are presented. PACS 96.60.Kx-Solar interior (including neutrino problem). PACS 12.15-Models of electroweak interactions.

Review of Scientific Instruments, 2016

This document is intended for publication in the open literature. It is made available on the cle... more This document is intended for publication in the open literature. It is made available on the clear understanding that it may not be further circulated and extracts or references may not be published prior to publication of the original when applicable, or without the consent of the Publications Officer, EUROfusion Programme Management Unit,

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC), 2009

Abstract—The procurement of Germanium-oxide (GeO2) depleted in 76 Ge is presented. The quality co... more Abstract—The procurement of Germanium-oxide (GeO2) depleted in 76 Ge is presented. The quality control, the reduction and zone refinement as well as crystal pulling is described as new detection systems must be explored in order to reach the needs of modern rare event ...

Il Nuovo Cimento A Series 11, 1992

Instruments and Experimental Techniques, 2012

ABSTRACT A new Nd-loaded liquid organic scintillator based on pseudocumene (PC) solvent was devel... more ABSTRACT A new Nd-loaded liquid organic scintillator based on pseudocumene (PC) solvent was developed for the experiment aimed at searching for 0νββ decay of a 150Nd nucleus. The optical characteristics of the scintillator were measured for several Nd concentrations. The measurements taken using two modules 1 and 2 m in length have made it possible to determine the effective attenuation length of the PC scintillator containing Nd (6.5 g/L). It was demonstrated that the scintillator characteristics remained unaltered over 1 year. The content of radioactive contaminants was analyzed, and the sensitivity of the experiment to effective Majorana neutrino mass 〈m ν〉 ∼ 0.05–0.10 eV was estimated for a detector containing a 12-ton scintillator.

2008 IEEE Nuclear Science Symposium Conference Record, 2008

The GERmanium Detector Array, GERDA, will search for neutrinoless double beta decay in 76 Ge at t... more The GERmanium Detector Array, GERDA, will search for neutrinoless double beta decay in 76 Ge at the National Gran Sasso Laboratory of the INFN. Bare high-purity germanium detectors enriched in 76 Ge will be submerged in liquid argon serving simultaneously as a shield against external radioactivity and as a cooling medium. In GERDA Phase-I, reprocessed enriched-Ge detectors, which were previously operated by the Heidelberg-Moscow and IGEX collaborations, will be redeployed. Before operating the enriched detectors, tests are performed with non-enriched bare HPGe detectors in the GERDA underground Detector Laboratory to test the Phase-I detector assembly, the detector handling protocols, the refurbishment technology and to study the long-term stability in liquid argon. The leakage currents in liquid argon and liquid nitrogen have been extensively studied under varying gamma irradiation conditions. In total three nonenriched high-purity p-type prototype germanium detectors have been operated successfully. The detector performance is stable over the long-term measurements. For the first time, performance of bare high-purity germanium detectors in liquid argon is reported.

Several liters of an organic liquid scintillator (LS) loaded with Nd have been made. We report on... more Several liters of an organic liquid scintillator (LS) loaded with Nd have been made. We report on performances of this scintillator in terms of optical properties, radiopurity and light yield for a Nd concentration of 6.5 g/l. A possible application to search for the 150Nd neutrinoless double beta decay with a 10-ton scale LS detector is discussed together with further

... M. AGLIETTA (1,2), B. ALESSANDRO (2), F. ARNEODO (2), L. BERGAMASCO (2,3), A. CAMPOS FAUTH (3... more ... M. AGLIETTA (1,2), B. ALESSANDRO (2), F. ARNEODO (2), L. BERGAMASCO (2,3), A. CAMPOS FAUTH (3,4), C. CASTAGNOLI (i,2), A. CASTELLINA (i,2), C. CATTADORI (5), A. CHIAVASSA (2,3) G. CINI (z.~), B. D'ETrORRE ... [4] DA HILL and NA PORTER: Nature, 191,690 ...

2008 IEEE Nuclear Science Symposium Conference Record, 2008

Cryogenic low-noise charge sensitive preamplifiers have been realized and tested for the GERmaniu... more Cryogenic low-noise charge sensitive preamplifiers have been realized and tested for the GERmanium Detector Array (GERDA). In the search of neutrino-less double-beta decay of 76Ge at LNGS, GERDA will operate bare segmented germanium detectors immersed in liquid argon. The front-end electronics will operate in the cryogenic liquid too. An integrated JFET-CMOS preamplifier, which is fully functional at cryogenic temperatures, has

IEEE Nuclear Science Symposium Conference Record, 2005, 2005

ABSTRACT We designed and realized a low-noise charge preamplifier for HPGe (high purity germanium... more ABSTRACT We designed and realized a low-noise charge preamplifier for HPGe (high purity germanium) γ-ray detectors, able to operate at a distance of 3 to 6 m from the detector. One transistor only is placed in close proximity to the detector. Such a setup is required in applications where the detector works in hostile environments that could damage or destroy the electronic circuitry. Using 3 m RG62 cables and a 23 pF detector capacitance we obtained a noise of ∼1.07 keV fwhm at 2 μs shaping time, so fully compatible with γ-spectroscopy requirements. By compensating the preamplifier so as to completely eliminate the ringings in its response function we obtained a rise-time of ∼46 ns with 3 m cables and of ∼80 ns with 5 m cables. With a different approach, or using a lower compensation capacitance and eliminating the ringings through a numerical post filter, we obtained a faster rise time of ∼33 ns, with a detector-preamplifier distance of 5 m, while maintaining the low-noise performance. This latter setup is adequate for spectroscopy and tracking of γ-rays with segmented HPGe detectors.

Il Nuovo Cimento C, 1992

ABSTRACT The EAS-TOP Extensive Air Shower array, on top of the under-ground Gran Sasso Laboratory... more ABSTRACT The EAS-TOP Extensive Air Shower array, on top of the under-ground Gran Sasso Laboratory, is fully operating as a γ-ray astronomy observatory since the beginning of 1989. After showing the measured angular resolution of the detector, we present the results obtained from the analysis of 280 days of measurements in 1989–1990, with the purpose of investigating possible emission (d.c. and sporadic) from the candidate sources in the Northern hemisphere at an energy, >200 TeV.

Physics Letters B, 1992

The GALLEX result 83 ± 19 (stat.) ± 8 (syst.) SNU is two standard deviations below the prediction... more The GALLEX result 83 ± 19 (stat.) ± 8 (syst.) SNU is two standard deviations below the predictions of stellar model calculations (124–132 SNU). To fit this result together with those of the chlorine and Kamiokande experiments requires severe stretching of solar models but does not ...

Journal of High Energy Physics

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) o... more The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the RO...

International Journal of Modern Physics: Conference Series

An observation of neutrinoless double beta ([Formula: see text]) decay would allow to shed light ... more An observation of neutrinoless double beta ([Formula: see text]) decay would allow to shed light onto the nature of neutrinos. Gerda (GERmanium Detector Array) aims to discover this process in a background-free search using [Formula: see text]Ge. The experiment is located at the Laboratori Nazionali del Gran Sasso (LNGS) of the Istituto Nazionale di Fisica Nucleare (INFN) in Italy. Bare, isotopically enriched, high purity germanium detectors are operated in liquid argon. Gerda follows a staged approach. In Phase II 35.6 kg of enriched germanium detectors are operated since December 2015. The application of active background rejection methods, such as a liquid argon scintillation light read-out and pulse shape discrimination of germanium detector signals, allows to reduce the background index to the intended level of [Formula: see text] cts/(keV⋅kg⋅yr). No evidence for the [Formula: see text] decay has been found in 23.2 kg⋅yr of Phase II data, and together with data from Phase I the...

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

A charge-sensitive preamplifier showing very low power consumption was developed in two versions:... more A charge-sensitive preamplifier showing very low power consumption was developed in two versions: the first using a JFET SNJ903L has a matching capacitance of 310 pF whereas the second one employing a SNJ3600L has 1100 pF. Both versions have a charge sensitivity of 8 muV/e-. The rise time is lower than 200 ns for both low and high capacitance versions at an input capacitance of 1000 and 3000 pF respectively. The low capacitance version has an equivalent noise charge of 220 e- rms at 0 pF for a CR-(RC)2 shaping at 10 mus shaping time. The noise at 1 mus is 510 e- rms at 0 pF and the noise slope is 1.59 e-/pF. The high capacitance version exhibits 400 e- rms at 0 pF and 10 mus shaping time. At 1 mus the equivalent noise charge is 1100 e- rms and the noise slope is 0.91 e-/pF. The second stage uses operational amplifiers of 16 MHz gain-bandwidth product and is prepared to make a differentiation with pole-zero cancellation if required. The final stage provides a differential output with 50 omega output impedance and can drive a 100 omega twisted pair cable loaded with its characteristic impedance. The total power dissipation is 190 mW for the SNJ903L version whereas the SNJ3600L version dissipates 265 mW. Both versions use +/-6 V. The circuit is mounted using thick film technology onto a 20×50 mm2 ceramic substrate. The project is complemented with the design of a 3000 V, 24 pF/m coaxial cable for detector biasing and signal transport with minimum contribution to the ENC.

Nuclear Physics B - Proceedings Supplements

Il Nuovo Cimento C

The GALLEX collaboration is performing an experiment for the detection of neutrinos coming princi... more The GALLEX collaboration is performing an experiment for the detection of neutrinos coming principally from the p-p fusion reaction in the Sun, via the reaction Ve + 7'Ga-' ~lGe-t-e-. The experiment is running in the Gran Sasso Underground Laboratory of INFN, using as a target 30.3 tons of gallium in the form of 8.13 molar aqueous GaC13 solution. A report is given of the status of GALLEX after the end of the operations devoted to the removal from the solution of the cosmogenically formed Ge isotopes, completed in the middle of 1991. The experiment is now collecting data on solar neutrinos and the data analysis is in progress. Preliminary results concerning the first year of measurement are presented. PACS 96.60.Kx-Solar interior (including neutrino problem). PACS 12.15-Models of electroweak interactions.

Review of Scientific Instruments, 2016

This document is intended for publication in the open literature. It is made available on the cle... more This document is intended for publication in the open literature. It is made available on the clear understanding that it may not be further circulated and extracts or references may not be published prior to publication of the original when applicable, or without the consent of the Publications Officer, EUROfusion Programme Management Unit,

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC), 2009

Abstract—The procurement of Germanium-oxide (GeO2) depleted in 76 Ge is presented. The quality co... more Abstract—The procurement of Germanium-oxide (GeO2) depleted in 76 Ge is presented. The quality control, the reduction and zone refinement as well as crystal pulling is described as new detection systems must be explored in order to reach the needs of modern rare event ...

Il Nuovo Cimento A Series 11, 1992

Instruments and Experimental Techniques, 2012

ABSTRACT A new Nd-loaded liquid organic scintillator based on pseudocumene (PC) solvent was devel... more ABSTRACT A new Nd-loaded liquid organic scintillator based on pseudocumene (PC) solvent was developed for the experiment aimed at searching for 0νββ decay of a 150Nd nucleus. The optical characteristics of the scintillator were measured for several Nd concentrations. The measurements taken using two modules 1 and 2 m in length have made it possible to determine the effective attenuation length of the PC scintillator containing Nd (6.5 g/L). It was demonstrated that the scintillator characteristics remained unaltered over 1 year. The content of radioactive contaminants was analyzed, and the sensitivity of the experiment to effective Majorana neutrino mass 〈m ν〉 ∼ 0.05–0.10 eV was estimated for a detector containing a 12-ton scintillator.

2008 IEEE Nuclear Science Symposium Conference Record, 2008

The GERmanium Detector Array, GERDA, will search for neutrinoless double beta decay in 76 Ge at t... more The GERmanium Detector Array, GERDA, will search for neutrinoless double beta decay in 76 Ge at the National Gran Sasso Laboratory of the INFN. Bare high-purity germanium detectors enriched in 76 Ge will be submerged in liquid argon serving simultaneously as a shield against external radioactivity and as a cooling medium. In GERDA Phase-I, reprocessed enriched-Ge detectors, which were previously operated by the Heidelberg-Moscow and IGEX collaborations, will be redeployed. Before operating the enriched detectors, tests are performed with non-enriched bare HPGe detectors in the GERDA underground Detector Laboratory to test the Phase-I detector assembly, the detector handling protocols, the refurbishment technology and to study the long-term stability in liquid argon. The leakage currents in liquid argon and liquid nitrogen have been extensively studied under varying gamma irradiation conditions. In total three nonenriched high-purity p-type prototype germanium detectors have been operated successfully. The detector performance is stable over the long-term measurements. For the first time, performance of bare high-purity germanium detectors in liquid argon is reported.

Several liters of an organic liquid scintillator (LS) loaded with Nd have been made. We report on... more Several liters of an organic liquid scintillator (LS) loaded with Nd have been made. We report on performances of this scintillator in terms of optical properties, radiopurity and light yield for a Nd concentration of 6.5 g/l. A possible application to search for the 150Nd neutrinoless double beta decay with a 10-ton scale LS detector is discussed together with further

... M. AGLIETTA (1,2), B. ALESSANDRO (2), F. ARNEODO (2), L. BERGAMASCO (2,3), A. CAMPOS FAUTH (3... more ... M. AGLIETTA (1,2), B. ALESSANDRO (2), F. ARNEODO (2), L. BERGAMASCO (2,3), A. CAMPOS FAUTH (3,4), C. CASTAGNOLI (i,2), A. CASTELLINA (i,2), C. CATTADORI (5), A. CHIAVASSA (2,3) G. CINI (z.~), B. D'ETrORRE ... [4] DA HILL and NA PORTER: Nature, 191,690 ...

2008 IEEE Nuclear Science Symposium Conference Record, 2008

Cryogenic low-noise charge sensitive preamplifiers have been realized and tested for the GERmaniu... more Cryogenic low-noise charge sensitive preamplifiers have been realized and tested for the GERmanium Detector Array (GERDA). In the search of neutrino-less double-beta decay of 76Ge at LNGS, GERDA will operate bare segmented germanium detectors immersed in liquid argon. The front-end electronics will operate in the cryogenic liquid too. An integrated JFET-CMOS preamplifier, which is fully functional at cryogenic temperatures, has

IEEE Nuclear Science Symposium Conference Record, 2005, 2005

ABSTRACT We designed and realized a low-noise charge preamplifier for HPGe (high purity germanium... more ABSTRACT We designed and realized a low-noise charge preamplifier for HPGe (high purity germanium) γ-ray detectors, able to operate at a distance of 3 to 6 m from the detector. One transistor only is placed in close proximity to the detector. Such a setup is required in applications where the detector works in hostile environments that could damage or destroy the electronic circuitry. Using 3 m RG62 cables and a 23 pF detector capacitance we obtained a noise of ∼1.07 keV fwhm at 2 μs shaping time, so fully compatible with γ-spectroscopy requirements. By compensating the preamplifier so as to completely eliminate the ringings in its response function we obtained a rise-time of ∼46 ns with 3 m cables and of ∼80 ns with 5 m cables. With a different approach, or using a lower compensation capacitance and eliminating the ringings through a numerical post filter, we obtained a faster rise time of ∼33 ns, with a detector-preamplifier distance of 5 m, while maintaining the low-noise performance. This latter setup is adequate for spectroscopy and tracking of γ-rays with segmented HPGe detectors.

Il Nuovo Cimento C, 1992

ABSTRACT The EAS-TOP Extensive Air Shower array, on top of the under-ground Gran Sasso Laboratory... more ABSTRACT The EAS-TOP Extensive Air Shower array, on top of the under-ground Gran Sasso Laboratory, is fully operating as a γ-ray astronomy observatory since the beginning of 1989. After showing the measured angular resolution of the detector, we present the results obtained from the analysis of 280 days of measurements in 1989–1990, with the purpose of investigating possible emission (d.c. and sporadic) from the candidate sources in the Northern hemisphere at an energy, >200 TeV.