E. Ferri

First measurement of the partial widths of 209Bi decay to the ground and to the first excited states.

J. W. Beeman, M. Biassoni , C. Brofferio , C. Bucci, S. Capelli , L. Cardani, M. Carrettoni , M. Clemenza , O. Cremonesi, E. Ferri , A. Giachero, L. Gironi , P. Gorla , C. Gotti , A. Nucciotti , C. Maiano , L. Pattavina, M. Pavan , G. Pessina, S. Pirro , E. Previtali , M. Sisti , and L. Zanotti 3 Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Dipartimento di Fisica, Università di Milano-Bicocca, Milano I-20126 Italy INFN Sezione di Milano Bicocca, Milano I-20126 Italy INFN Laboratori Nazionali del Gran Sasso, Assergi (L’Aquila) I-67010 Italy Dipartimento di Fisica, Sapienza Università di Roma, and INFNSezione di Roma, Roma I-00185, Italy INFN Sezione di Roma II, Roma I-00133 Italy and Dipartimento di Elettronica e TLC, Università di Firenze, Via S. Marta 3, Firenze I-50125 Italy (Dated: February 3, 2013)

Expectations for a new calorimetric neutrino mass experiment

Abstract A large calorimetric neutrino mass experiment using thermal detectors is expected to play a crucial role in the challenge for directly assessing the neutrino mass. We discuss and compare here two approaches to the estimation of the experimental sensitivity of such an experiment. The first method uses an analytic formulation and allows to readily obtain a sensible estimate over a wide range of experimental configurations. The second method is based on a frequentist Monte Carlo technique and is more precise and reliable. The Monte Carlo approach is then exploited to study the main sources of systematic uncertainties peculiar to calorimetric experiments. Finally, the tools are applied to investigate the optimal experimental configuration for a calorimetric experiment with rhenium based thermal detectors.

Algorithms for Identification of Nearly-Coincident Events in Calorimetric Sensors

For experiments with high arrival rates, reliable identification of nearly-coincident events can be crucial. For calorimetric measurements to directly measure the neutrino mass such as HOLMES, unidentified pulse pile-ups are expected to be a leading source of experimental error. Although Wiener filtering can be used to recognize pile-up, it suffers from errors due to pulse shape variation from detector nonlinearity, readout dependence on subsample arrival times, and stability issues from the ill-posed deconvolution problem of recovering Dirac delta-functions from smooth data. Due to these factors, we have developed a processing method that exploits singular value decomposition to (1) separate single-pulse records from piled-up records in training data and (2) construct a model of single-pulse records that accounts for varying pulse shape with amplitude, arrival time, and baseline level, suitable for detecting nearly-coincident events. We show that the resulting processing advances can reduce the required performance specifications of the detectors and readout system or, equivalently, enable larger sensor arrays and better constraints on the neutrino mass.

Cerenkov light identification with Si low-temperature detectors with sensitivity enhanced by the Neganov-Luke effect

A new generation of cryogenic light detectors exploiting Neganov-Luke effect to enhance the thermal signal has been used to detect the Cherenkov light emitted by the electrons interacting in TeO2 crystals. With this mechanism a high significance event-by-event discrimination between alpha and beta/gamma interactions at the 130Te neutrino-less double beta decay Q-value (2527.515 ± 0.013) keV has been demonstrated. This measurement opens the possibility of drastically reducing the background in cryogenic experiments based on TeO2.

Search for double-β decay of 130Te to the first 0+ excited state of 130Xe with the CUORICINO experiment bolometer array

E. Andreotti, 2, a C. Arnaboldi, F. T. Avignone III, M. Balata, I. Bandac, M. Barucci, 7 J. W. Beeman, F. Bellini, 10 C. Brofferio, 3 A. Bryant, 12 C. Bucci, L. Canonica, 14 S. Capelli, 3 L. Carbone, M. Carrettoni, 3 M. Clemenza, 3 O. Cremonesi, R. J. Creswick, S. Di Domizio, 14 M. J. Dolinski, 15 L. Ejzak, R. Faccini, 10 H. A. Farach, E. Ferri, 3 E. Fiorini, 3, b L. Foggetta, 2, c A. Giachero, L. Gironi, 3 A. Giuliani, 2, d P. Gorla, e E. Guardincerri, 11, 14 T. D. Gutierrez, E. E. Haller, 18 K. Kazkaz, L. Kogler, 12 S. Kraft, 3 C. Maiano, 3 C. Martinez, f M. Martinez, 19, g R. H. Maruyama, S. Newman, 5 S. Nisi, C. Nones, 2, h E. B. Norman, 20 A. Nucciotti, 3 F. Orio, 10 M. Pallavicini, 14 V. Palmieri, L. Pattavina, 3 M. Pavan, 3 M. Pedretti, G. Pessina, S. Pirro, E. Previtali, L. Risegari, 7 C. Rosenfeld, C. Rusconi, 2 C. Salvioni, 2 S. Sangiorgio, i D. Schaeffer, 3 N. D. Scielzo, M. Sisti, 3 A. R. Smith, C. Tomei, G. Ventura, 7 and M. Vignati 10 Dipartimento di Fisica e Matematica, Università dell’Insubria, Como I-22100 Italy INFN Sezione di Milano Bicocca, Milano I-20126 Italy Dipartimento di Fisica, Università di Milano-Bicocca, Milano I-20126 Italy Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208 USA INFN Laboratori Nazionali del Gran Sasso, Assergi (L’Aquila) I-67010 Italy Dipartimento di Fisica, Università di Firenze, Firenze I-50125 Italy INFN Sezione di Firenze, Firenze I-50125 Italy Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA Dipartimento di Fisica, Sapienza Università di Roma, Roma I-00185 Italy INFN Sezione di Roma, Roma I-00185 Italy Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA Department of Physics, University of California, Berkeley, CA 94720 USA Dipartimento di Fisica, Università di Genova, Genova I-16146 Italy INFN Sezione di Genova, Genova I-16146 Italy Lawrence Livermore National Laboratory, Livermore, CA 94550 USA Department of Physics, University of Wisconsin, Madison, WI 53706 USA Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407 USA Department of Materials Science and Engineering, University of California, Berkeley, CA 94720 USA Laboratorio de Fisica Nuclear y Astroparticulas, Universidad de Zaragoza, Zaragoza 50009 Spain Department of Nuclear Engineering, University of California, Berkeley, CA 94720 USA INFN Laboratori Nazionali di Legnaro, Legnaro (Padova) I-35020 Italy EH&S Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA (Dated: February 1, 2013)

Measuring the electron neutrino mass with improved sensitivity: the HOLMES experiment

HOLMES is a new experiment aiming at directly measuring the neutrino mass with a sensitivity below 2 eV. HOLMES will perform a calorimetric measurement of the energy released in the decay of

The 4K outer cryostat for the CUORE experiment: Construction and quality control

^{163}

Investigation of peak shapes in the MIBETA experiment calibrations

Ho. The calorimetric measurement eliminates systematic uncertainties arising from the use of external beta sources, as in experiments with spectrometers. This measurement was proposed in 1982 by A. De Rujula and M. Lusignoli, but only recently the detector technological progress has allowed to design a sensitive experiment. HOLMES will deploy a large array of low temperature microcalorimeters with implanted

Sensitivity and systematics of calorimetric neutrino mass experiments

^{163}

Production and separation of 163Ho for nuclear physics experiments

Ho nuclei. HOLMES, besides being an important step forward in the direct neutrino mass measurement with a calorimetric approach, will also establish the potential of this approach to extend the sensitivity down to 0.1 eV and lower. In its final configuration HOLMES will collect about