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Papers by Massimiliano Clemenza

Research paper thumbnail of Muonic atom X-ray spectroscopy for non-destructive analysis of archeological samples

Journal of Radioanalytical and Nuclear Chemistry

Research paper thumbnail of 137Cs contamination in the Adamello glacier: Improving the analytical method

Journal of Environmental Radioactivity

Research paper thumbnail of Double beta decay search with CUPID-0: Results and Perspectives

Proceedings of The 39th International Conference on High Energy Physics — PoS(ICHEP2018)

Research paper thumbnail of The Ruthenium-106 plume over Europe in 2017: A source-receptor model to estimate the source region

Research paper thumbnail of Saharan dust events in the European Alps: role in snowmelt and geochemical characterization

Research paper thumbnail of Result on the Neutrinoless Double Beta Decay Search of 82Se with the CUPID-0 Experiment

Universe

CUPID-0 is the first large array of scintillating Zn 82 Se cryogenic calorimeters (bolometers) im... more CUPID-0 is the first large array of scintillating Zn 82 Se cryogenic calorimeters (bolometers) implementing particle identification for the search of the neutrinoless double beta decay (0 ν β β ). The detector consists of 24 enriched Zn 82 Se bolometers for a total 82 Se mass of 5.28 kg and it has been taking data in the underground LNGS (Italy) since March 2017. In this article we show how the dual read-out provides a powerful tool for the α particles rejection. The simultaneous use of the heat and light information allows us to reduce the background down to (3.2 − 1.1 + 1.3 )×10 − 3 counts/(keV kg year), an unprecedented level for cryogenic calorimeters. In a total exposure of 5.46 kg year Zn 82 Se we set the most stringent limit on the 0 ν β β decay 82 Se half-life T 1 / 2 0 ν > 4.0 × 10 24 year at 90% C.I.

Research paper thumbnail of Results from the CUORE experiment

Proceedings of XIV International Conference on Heavy Quarks and Leptons — PoS(HQL2018)

Research paper thumbnail of CUORE: first results and prospects

Proceedings of The 19th International Workshop on Neutrinos from Accelerators NUFACT2017 — PoS(NuFact2017)

Research paper thumbnail of The commissioning of the CUORE experiment: the mini-tower run

Proceedings of XVII International Workshop on Neutrino Telescopes — PoS(NEUTEL2017)

Research paper thumbnail of Saharan dust events in the European Alps: role on snowmelt and geochemical characterization

The Cryosphere Discussions

Research paper thumbnail of Low background neutron activation: a high sensitivity technique for long-lived radionuclides determination in rare events physics experiments

Journal of Radioanalytical and Nuclear Chemistry

Research paper thumbnail of High performance DAQ for muon spectroscopy experiments

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

Research paper thumbnail of Author Correction: Cryoconite as a temporary sink for anthropogenic species stored in glaciers

Scientific reports, Jan 25, 2018

A correction to this article has been published and is linked from the HTML and PDF versions of t... more A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

Research paper thumbnail of Cryoconite as a temporary sink for anthropogenic species stored in glaciers

Research paper thumbnail of Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization

Journal of Instrumentation, 2016

Research paper thumbnail of TRIGA reactor absolute neutron flux measurement using activated isotopes

Progress in Nuclear Energy, 2014

ABSTRACT The neutron flux is a crucial parameter for the analysis of nuclear reactors, because it... more ABSTRACT The neutron flux is a crucial parameter for the analysis of nuclear reactors, because it affects the reaction rate and thus the fuel burnup. Moreover, a very precise knowledge of the flux in the irradiation positions is helpful for benchmarking the simulation models of the reactor. In particular, an MCNP model of the TRIGA Mark II reactor installed at LENA (Laboratory of Applied Nuclear Energy) of the University of Pavia was developed in the recent years, describing the geometries and the materials of the whole reactor with very good accuracy. In this article, we present the results of the neutron flux measurements in four irradiation positions. The neutron activation technique was used to perform an absolute measurement of the flux. Various samples containing a known amount of elements were irradiated in the reactor facilities and the activation rate of a large number of isotopes was measured through g-ray spectroscopy with very low background HPGe detectors. In order to accurately calculate the activation rate, Monte Carlo codes based on GEANT4 were developed to evaluate the g-ray detection efficiency for every radioisotope of interest. The samples were measured with three different HPGe detectors and the measurements were repeated in various geometric configurations in order to assess the reliability and repeatability of this analysis technique. The MCNP reactor model was used to evaluate the energetic neutron flux distributions in the irradiation positions. The effective activation cross sections were computed from these distributions, testing the dependence on the MCNP simulation results. Finally, the neutron flux was calculated from the data of activation rate and effective cross section of each isotope. The good agreement in the results of the flux calculations from the many different activated samples confirms the reliability of the adopted methodology.

Research paper thumbnail of Cuore Experiment: The Search for Neutrinoless Double Beta Decay

International Journal of Modern Physics A, 2008

The main purpose of the Cryogenic Underground Observatory for Rare Events (CUORE) experiment is t... more The main purpose of the Cryogenic Underground Observatory for Rare Events (CUORE) experiment is the search for the Neutrinoless Double Beta Decay (0νDBD) of 130 Te reaching a sensitivity on Majorana mass better than 50 meV. Cuoricino represents not only the first stage of CUORE, but also the most massive 0νDBD experiment presently running. Present results and future planning of these experiments will be described in the paper.

Research paper thumbnail of 130Te neutrinoless double-beta decay with CUORICINO

Astroparticle Physics, 2011

Research paper thumbnail of Validation of techniques to mitigate copper surface contamination in CUORE

Astroparticle Physics, 2013

Research paper thumbnail of Studio della distribuzione spaziale dell’attivita’ del 137Cs in suoli alpini

The study of the distribution of the 137Cs is a popular methodology to estimate soil erosion rate... more The study of the distribution of the 137Cs is a popular methodology to estimate soil erosion rates. In a high plain area site in the Italian Central Alps (Valchiavenna), soils have been sampled in 135 points. The samples were measured by γ spectrometry using a HPGe detector. Early results showed a high spatial variability of the superficial distribution of 137Cs, however the activity of 137Cs tends to become homogeneous in the deeper soils’ layers. In order to map 137Cs activity in the topsoil, a regression model has been fitted using topographical descriptors, derived from an high resolution DEM, and soil properties. The Poisson model has been effective in modelling the relation between 137Cs activity, soil properties and topographical descriptors. When combined in a regression kriging procedure the model has been able to explain roughly 0.65 of data variance. Moreover when used on short topographic gradients, the Poisson model is able to explain up to the 0.81 of the 137Cs activit...

Research paper thumbnail of Muonic atom X-ray spectroscopy for non-destructive analysis of archeological samples

Journal of Radioanalytical and Nuclear Chemistry

Research paper thumbnail of 137Cs contamination in the Adamello glacier: Improving the analytical method

Journal of Environmental Radioactivity

Research paper thumbnail of Double beta decay search with CUPID-0: Results and Perspectives

Proceedings of The 39th International Conference on High Energy Physics — PoS(ICHEP2018)

Research paper thumbnail of The Ruthenium-106 plume over Europe in 2017: A source-receptor model to estimate the source region

Research paper thumbnail of Saharan dust events in the European Alps: role in snowmelt and geochemical characterization

Research paper thumbnail of Result on the Neutrinoless Double Beta Decay Search of 82Se with the CUPID-0 Experiment

Universe

CUPID-0 is the first large array of scintillating Zn 82 Se cryogenic calorimeters (bolometers) im... more CUPID-0 is the first large array of scintillating Zn 82 Se cryogenic calorimeters (bolometers) implementing particle identification for the search of the neutrinoless double beta decay (0 ν β β ). The detector consists of 24 enriched Zn 82 Se bolometers for a total 82 Se mass of 5.28 kg and it has been taking data in the underground LNGS (Italy) since March 2017. In this article we show how the dual read-out provides a powerful tool for the α particles rejection. The simultaneous use of the heat and light information allows us to reduce the background down to (3.2 − 1.1 + 1.3 )×10 − 3 counts/(keV kg year), an unprecedented level for cryogenic calorimeters. In a total exposure of 5.46 kg year Zn 82 Se we set the most stringent limit on the 0 ν β β decay 82 Se half-life T 1 / 2 0 ν > 4.0 × 10 24 year at 90% C.I.

Research paper thumbnail of Results from the CUORE experiment

Proceedings of XIV International Conference on Heavy Quarks and Leptons — PoS(HQL2018)

Research paper thumbnail of CUORE: first results and prospects

Proceedings of The 19th International Workshop on Neutrinos from Accelerators NUFACT2017 — PoS(NuFact2017)

Research paper thumbnail of The commissioning of the CUORE experiment: the mini-tower run

Proceedings of XVII International Workshop on Neutrino Telescopes — PoS(NEUTEL2017)

Research paper thumbnail of Saharan dust events in the European Alps: role on snowmelt and geochemical characterization

The Cryosphere Discussions

Research paper thumbnail of Low background neutron activation: a high sensitivity technique for long-lived radionuclides determination in rare events physics experiments

Journal of Radioanalytical and Nuclear Chemistry

Research paper thumbnail of High performance DAQ for muon spectroscopy experiments

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

Research paper thumbnail of Author Correction: Cryoconite as a temporary sink for anthropogenic species stored in glaciers

Scientific reports, Jan 25, 2018

A correction to this article has been published and is linked from the HTML and PDF versions of t... more A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

Research paper thumbnail of Cryoconite as a temporary sink for anthropogenic species stored in glaciers

Research paper thumbnail of Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization

Journal of Instrumentation, 2016

Research paper thumbnail of TRIGA reactor absolute neutron flux measurement using activated isotopes

Progress in Nuclear Energy, 2014

ABSTRACT The neutron flux is a crucial parameter for the analysis of nuclear reactors, because it... more ABSTRACT The neutron flux is a crucial parameter for the analysis of nuclear reactors, because it affects the reaction rate and thus the fuel burnup. Moreover, a very precise knowledge of the flux in the irradiation positions is helpful for benchmarking the simulation models of the reactor. In particular, an MCNP model of the TRIGA Mark II reactor installed at LENA (Laboratory of Applied Nuclear Energy) of the University of Pavia was developed in the recent years, describing the geometries and the materials of the whole reactor with very good accuracy. In this article, we present the results of the neutron flux measurements in four irradiation positions. The neutron activation technique was used to perform an absolute measurement of the flux. Various samples containing a known amount of elements were irradiated in the reactor facilities and the activation rate of a large number of isotopes was measured through g-ray spectroscopy with very low background HPGe detectors. In order to accurately calculate the activation rate, Monte Carlo codes based on GEANT4 were developed to evaluate the g-ray detection efficiency for every radioisotope of interest. The samples were measured with three different HPGe detectors and the measurements were repeated in various geometric configurations in order to assess the reliability and repeatability of this analysis technique. The MCNP reactor model was used to evaluate the energetic neutron flux distributions in the irradiation positions. The effective activation cross sections were computed from these distributions, testing the dependence on the MCNP simulation results. Finally, the neutron flux was calculated from the data of activation rate and effective cross section of each isotope. The good agreement in the results of the flux calculations from the many different activated samples confirms the reliability of the adopted methodology.

Research paper thumbnail of Cuore Experiment: The Search for Neutrinoless Double Beta Decay

International Journal of Modern Physics A, 2008

The main purpose of the Cryogenic Underground Observatory for Rare Events (CUORE) experiment is t... more The main purpose of the Cryogenic Underground Observatory for Rare Events (CUORE) experiment is the search for the Neutrinoless Double Beta Decay (0νDBD) of 130 Te reaching a sensitivity on Majorana mass better than 50 meV. Cuoricino represents not only the first stage of CUORE, but also the most massive 0νDBD experiment presently running. Present results and future planning of these experiments will be described in the paper.

Research paper thumbnail of 130Te neutrinoless double-beta decay with CUORICINO

Astroparticle Physics, 2011

Research paper thumbnail of Validation of techniques to mitigate copper surface contamination in CUORE

Astroparticle Physics, 2013

Research paper thumbnail of Studio della distribuzione spaziale dell’attivita’ del 137Cs in suoli alpini

The study of the distribution of the 137Cs is a popular methodology to estimate soil erosion rate... more The study of the distribution of the 137Cs is a popular methodology to estimate soil erosion rates. In a high plain area site in the Italian Central Alps (Valchiavenna), soils have been sampled in 135 points. The samples were measured by γ spectrometry using a HPGe detector. Early results showed a high spatial variability of the superficial distribution of 137Cs, however the activity of 137Cs tends to become homogeneous in the deeper soils’ layers. In order to map 137Cs activity in the topsoil, a regression model has been fitted using topographical descriptors, derived from an high resolution DEM, and soil properties. The Poisson model has been effective in modelling the relation between 137Cs activity, soil properties and topographical descriptors. When combined in a regression kriging procedure the model has been able to explain roughly 0.65 of data variance. Moreover when used on short topographic gradients, the Poisson model is able to explain up to the 0.81 of the 137Cs activit...