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1. Double-beta decay of ${}^{130}$Te to the first $0^+$ excited state of ${}^{130}$Xe with CUORE-0

Author

Collaboration, CUORE, Alduino, C, Alfonso, K, Artusa, DR, III, FT Avignone, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, D'Addabbo, A, Dafinei, I, Davis, CJ, Dell'Oro, S, Deninno, MM, Domizio, S Di, Vacri, ML Di, Drobizhev, A, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, Yu G, Leder, A, Lim, KE, Liu, X, Ma, YG, Maino, M, Marini, L, Martinez, M, Maruyama, RH, Mei, Y, Moggi, N, Morganti, S, Mosteiro, PJ, Nastasi, M, Nones, C, Norman, EB, Nucciotti, A, O'Donnell, T, Orio, F, Ouellet, JL, Pagliarone, CE, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pessina, G, Pettinacci, V, Piperno, G, Pirro, S, Pozzi, S, Previtali, E, Rosenfeld, C, Rusconi, C, Sangiorgio, S, Santone, D, Scielzo, ND, Singh, V, Sisti, M, Smith, AR, Taffarello, L, Tenconi, M, Terranova, F, Tomei, C, Trentalange, S, Vignati, M, Wagaarachchi, SL, Wang, BS, Wang, HW, Wilson, J, Winslow, LA, Wise, T, Woodcraft, A, Zanotti, L, Zhang, GQ, Zhu, BX, Zimmermann, S, and Zucchelli, S

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), nucl-ex, physics.ins-det, Nuclear Experiment
Abstract

We report on a search for double beta decay of $^{130}$Te to the first $0^{+}$ excited state of $^{130}$Xe using a 9.8 kg$\cdot$yr exposure of $^{130}$Te collected with the CUORE-0 experiment. In this work we exploit different topologies of coincident events to search for both the neutrinoless and two-neutrino double-decay modes. We find no evidence for either mode and place lower bounds on the half-lives: $��^{0��}_{0^+}>7.9\cdot 10^{23}$ yr and $��^{2��}_{0^+}>2.4\cdot 10^{23}$ yr. Combining our results with those obtained by the CUORICINO experiment, we achieve the most stringent constraints available for these processes: $��^{0��}_{0^+}>1.4\cdot 10^{24}$ yr and $��^{2��}_{0^+}>2.5\cdot 10^{23}$ yr., 9 pages, 5 figures, 5 tables

Published
2018

2. Low energy analysis techniques for CUORE

Author

Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Bari, G, Beeman, JW, Bellini, F, Benato, G, Bersani, A, Biassoni, M, Branca, A, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, D’Addabbo, A, D’Aguanno, D, Dafinei, I, Davis, CJ, Dell’Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Leder, A, Ligi, C, Lim, KE, Ma, YG, Maino, M, and Marini, L

Subjects
Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics
Abstract

© 2017, The Author(s). CUORE is a tonne-scale cryogenic detector operating at the Laboratori Nazionali del Gran Sasso (LNGS) that uses tellurium dioxide bolometers to search for neutrinoless double-beta decay of 130Te. CUORE is also suitable to search for low energy rare events such as solar axions or WIMP scattering, thanks to its ultra-low background and large target mass. However, to conduct such sensitive searches requires improving the energy threshold to 10 keV. In this paper, we describe the analysis techniques developed for the low energy analysis of CUORE-like detectors, using the data acquired from November 2013 to March 2015 by CUORE-0, a single-tower prototype designed to validate the assembly procedure and new cleaning techniques of CUORE. We explain the energy threshold optimization, continuous monitoring of the trigger efficiency, data and event selection, and energy calibration at low energies in detail. We also present the low energy background spectrum of CUORE-0 below 60keV. Finally, we report the sensitivity of CUORE to WIMP annual modulation using the CUORE-0 energy threshold and background, as well as an estimate of the uncertainty on the nuclear quenching factor from nuclear recoils inCUORE-0.

Published
2017
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3. CUORE sensitivity to 0 decay

Author

Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Benato, G, Bersani, A, Biassoni, M, Branca, A, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, D’Addabbo, A, Dafinei, I, Davis, CJ, Dell’Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Leder, A, Ligi, C, and Lim, KE

Subjects
nucl-ex, physics.ins-det
Abstract

© 2017, The Author(s). We report a study of the CUORE sensitivity to neutrinoless double beta (0) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the 0 decay half-life (T1/20ν) at 90 % credibility interval (CI) – i.e. the interval containing the true value of T1/20ν with 90 % probability – and the 3σ discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a 90 % CI exclusion sensitivity of 2 · 10 25 year with 3 months, and 9 · 10 25 year with 5 years of live time. Under the same conditions, the discovery sensitivity after 3 months and 5 years will be 7 · 10 24 year and 4 · 10 25 year, respectively.

Published
2017
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4. The projected background for the CUORE experiment

Author

Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Benato, G, Bersani, A, Biassoni, M, Branca, A, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, D’Addabbo, A, Dafinei, I, Davis, CJ, Dell’Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Leder, A, Ligi, C, Lim, KE, and Ma, YG

Subjects
physics.ins-det
Abstract

© 2017, The Author(s). The Cryogenic Underground Observatory for Rare Events (CUORE) is designed to search for neutrinoless double beta decay of 130Te with an array of 988 TeO2 bolometers operating at temperatures around 10 mK. The experiment is currently being commissioned in Hall A of Laboratori Nazionali del Gran Sasso, Italy. The goal of CUORE is to reach a 90% C.L. exclusion sensitivity on the 130Te decay half-life of 9 × 1025 years after 5 years of data taking. The main issue to be addressed to accomplish this aim is the rate of background events in the region of interest, which must not be higher than 10- 2 counts/keV/kg/year. We developed a detailed Monte Carlo simulation, based on results from a campaign of material screening, radioassays, and bolometric measurements, to evaluate the expected background. This was used over the years to guide the construction strategies of the experiment and we use it here to project a background model for CUORE. In this paper we report the results of our study and our expectations for the background rate in the energy region where the peak signature of neutrinoless double beta decay of 130Te is expected.

Published
2017
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5. Measurement of the two-neutrino double-beta decay half-life of130Te with the CUORE-0 experiment

Author

Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, D’Addabbo, A, Dafinei, I, Davis, CJ, Dell’Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Feintzeig, J, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Leder, A, Ligi, C, and Lim, KE

Abstract

© 2017, The Author(s). We report on the measurement of the two-neutrino double-beta decay half-life of130Te with the CUORE-0 detector. From an exposure of 33.4 kg year of TeO2, the half-life is determined to be T1/22ν= [8.2 ± 0.2 (stat.) ± 0.6 (syst.)] × 1020 year. This result is obtained after a detailed reconstruction of the sources responsible for the CUORE-0 counting rate, with a specific study of those contributing to the130Te neutrinoless double-beta decay region of interest.

Published
2017
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6. Large Stark tuning of donor electron spin qubits in germanium

Author

Sigillito, AJ, Tyryshkin, AM, Beeman, JW, Haller, EE, Itoh, KM, and Lyon, SA

Subjects
Condensed Matter::Materials Science, Engineering, Fluids & Plasmas, Physical Sciences, Chemical Sciences, Physics::Atomic Physics, Physics::Chemical Physics
Abstract

© 2016 American Physical Society. Donor electron spins in semiconductors make exceptional qubits because of their long coherence times and compatibility with industrial fabrication techniques. Despite many advances in donor-based qubit technology, it remains difficult to selectively manipulate single-donor electron spins. Here, we show that by replacing the prevailing semiconductor host material (silicon) with germanium, donor electron spin qubits can be electrically tuned by more than an ensemble linewidth, making them compatible with gate-addressable quantum computing architectures. Using X-band pulsed electron spin resonance, we measured the Stark effect for donor electron spins in germanium. We resolved both spin-orbit and hyperfine Stark shifts and found that at 0.4 T, the spin-orbit Stark shift dominates. The spin-orbit Stark shift is highly anisotropic, depending on the electric field orientation relative to the crystal axes and external magnetic field. When the Stark shift is maximized, the spin-orbit Stark parameter is four orders of magnitude larger than in silicon. At select orientations a hyperfine Stark effect was also resolved and is an order of magnitude larger than in silicon. We report the Stark parameters for As75 and P31 donor electrons and compare them to the available theory. Our data reveal that P31 donors in germanium can be tuned by at least four times the ensemble linewidth, making germanium an appealing new host material for spin qubits that offers major advantages over silicon.

Published
2016
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7. Results from the CUORE-0 experiment

Author

Canonica, L, Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Caminata, A, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, Dafinei, I, Dally, A, Davis, CJ, Dell'Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Yu Kolomensky, G, Lim, KE, Liu, X, Ma, YG, and Maino, M

Subjects
neutrino astronomy, antarctic ice attenuation, high energy neutrinos, ANITA, ARIANNA, GZK neutrinos, radio detection
Abstract

The CUORE-0 experiment searched for neutrinoless double beta decay in130Te using an array of 52 tellurium dioxide crystals, operated as bolometers at a temperature of 10 mK. It took data in the Gran Sasso National Laboratory (Italy) since March 2013 to March 2015. We present the results of a search for neutrinoless double beta decay in 9.8 kg-years130Te exposure that allowed us to set the most stringent limit to date on this half-life. The performance of the detector in terms of background and energy resolution is also reported.

Published
2016
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8. Analysis techniques for the evaluation of the neutrinoless double- β decay lifetime in Te 130 with the CUORE-0 detector

Author

Alduino, C, Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, Dafinei, I, Dally, A, Davis, CJ, Dell'Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Lim, KE, and Liu, X

Abstract

© 2016 American Physical Society. We describe in detail the methods used to obtain the lower bound on the lifetime of neutrinoless double-beta (0νββ) decay in Te130 and the associated limit on the effective Majorana mass of the neutrino using the CUORE-0 detector. CUORE-0 is a bolometric detector array located at the Laboratori Nazionali del Gran Sasso that was designed to validate the background reduction techniques developed for CUORE, a next-generation experiment scheduled to come online in 2016. CUORE-0 is also a competitive 0νββ decay search in its own right and functions as a platform to further develop the analysis tools and procedures to be used in CUORE. These include data collection, event selection and processing, as well as an evaluation of signal efficiency. In particular, we describe the amplitude evaluation, thermal gain stabilization, energy calibration methods, and the analysis event selection used to create our final 0νββ search spectrum. We define our high level analysis procedures, with emphasis on the new insights gained and challenges encountered. We outline in detail our fitting methods near the hypothesized 0νββ decay peak and catalog the main sources of systematic uncertainty. Finally, we derive the 0νββ decay half-life limits previously reported for CUORE-0, T1/20ν>2.7×1024yr, and in combination with the Cuoricino limit, T1/20ν>4.0×1024yr.

Published
2016
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9. Status of CUORE Experiment and latest results from CUORE-0

Author

Pagliarone, C, Alduino, C, Alfonso, K, Artusa, Dr, Avignone, Ft, Azzolini, O, Banks, Ti, Bari, G, Beeman, Jw, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, Xg, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, Rj, Cushman, Js, Dafinei, I, Davis, Cj, Dell'Oro, S, Deninno, Mm, Di Domizio, S, Di Vacri, Ml, Drobizhev, A, Fang, Dq, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, Ma, Freedman, Sj, Fujikawa, Bk, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, Td, Haller, Ee, Han, K, Hansen, E, Heeger, Km, Hennings-Yeomans, R, Hickerson, Kp, Huang, Hz, Kadel, R, Keppel, G, Kolomensky, Yg, Leder, A, Ligi, C, Lim, Ke, Liu, X, Yg, Ma, Maino, M, Marini, L, Martinez, M, Maruyama, Rh, Mei, Y, Moggi, N, Morganti, S, Mosteiro, Pj, Napolitano, T, Nones, C, Norman, Eb, Nucciotti, A, O'Donnell, T, Orio, F, Ouellet, Jl, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pessina, G, Pettinacci, V, Piperno, G, Pira, C, Pirro, S, Pozzi, S, Previtali, E, Rosenfeld, C, Rusconi, C, Sala, E, Sangiorgio, S, Santone, D, Scielzo, Nd, Singh, V, Sisti, M, Smith, Ar, Taffarello, L, Tenconi, M, Terranova, F, Tomei, C, Trentalange, S, Ventura, G, Vignati, M, Wagaarachchi, Sl, Wang, Bs, Wang, Hw, Wilson, J, Winslow, La, Wise, T, Woodcraft, A, Zanotti, L, Zhang, Gq, Zhu, Bx, Zimmermann, S, Zucchelli, S, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CUORE, Pagliarone, C, Alduino, C, Alfonso, K, Artusa, D, Avignone, F, Azzolini, O, Banks, T, Bari, G, Beeman, J, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, X, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Carniti, P, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, R, Cushman, J, Dafinei, I, Davis, C, Dell'Oro, S, Deninno, M, Di Domizio, S, Di Vacri, M, Drobizhev, A, Fang, D, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, M, Freedman, S, Fujikawa, B, Giachero, A, Gironi, L, Giuliani, A, Gladstone, L, Gorla, P, Gotti, C, Gutierrez, T, Haller, E, Han, K, Hansen, E, Heeger, K, Hennings Yeomans, R, Hickerson, K, Huang, H, Kadel, R, Keppel, G, Kolomensky, Y, Leder, A, Ligi, C, Lim, K, Liu, X, Ma, Y, Maino, M, Marini, L, Martinez, M, Maruyama, R, Mei, Y, Moggi, N, Morganti, S, Mosteiro, P, Napolitano, T, Nones, C, Norman, E, Nucciotti, A, O'Donnell, T, Orio, F, Ouellet, J, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pessina, G, Pettinacci, V, Piperno, G, Pira, C, Pirro, S, Pozzi, S, Previtali, E, Rosenfeld, C, Rusconi, C, Sala, E, Sangiorgio, S, Santone, D, Scielzo, N, Singh, V, Sisti, M, Smith, A, Taffarello, L, Tenconi, M, Terranova, F, Tomei, C, Trentalange, S, Ventura, G, Vignati, M, Wagaarachchi, S, Wang, B, Wang, H, Wilson, J, Winslow, L, Wise, T, Woodcraft, A, Zanotti, L, Zhang, G, Zhu, B, Zimmermann, S, and Zucchelli, S

Subjects
nuclear transition, CUORE, neutrino: Majorana: mass, Neutrinoless Double Beta Decay, low-temperature detectors, Cryostat, double-beta decay: (0neutrino) | neutrino: Majorana: mass | tellurium | CUORE | experimental results, talk: La Thuile 2016/03/06, double-beta decay: (0neutrino), Double-Beta Decay, tellurium, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CUORE experiment, High Energy Physics::Experiment, experimental results
Abstract

International audience; Neutrinoless Double Beta Decay (0νββ) is a rare nuclear transition that if it occurs at all it will be very important for the exploration of the inverted hierarchy region of the neutrino mass pattern. The Cryogenic Underground Observatory for Rare Events (CUORE) is an experiment that aims to search for such a transition in 130Te together with other rare processes. In the present paper we will describe the basic features of CUORE Experiment, the status of the experiment as well as the latest results obtained from CUORE-0 detector, a smaller scale experiment constructed to test and demonstrate the expected performances of CUORE.

Published
2016
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10. Search for Neutrinoless Double-Beta Decay of Te 130 with CUORE-0

Author

Alfonso, K, Artusa, DR, Avignone, FT, Azzolini, O, Balata, M, Banks, TI, Bari, G, Beeman, JW, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Caminata, A, Canonica, L, Cao, XG, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Cushman, JS, Dafinei, I, Dally, A, Dell'Oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Ejzak, L, Fang, DQ, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Hansen, E, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Lim, KE, Liu, X, Ma, YG, and Maino, M

Abstract

© 2015 American Physical Society. © 2015 American Physical Society. We report the results of a search for neutrinoless double-beta decay in a 9.8 kg yr exposure of Te130 using a bolometric detector array, CUORE-0. The characteristic detector energy resolution and background level in the region of interest are 5.1±0.3keV FWHM and 0.058±0.004(stat)±0.002(syst)counts/(keVkgyr), respectively. The median 90% C.L. lower-limit half-life sensitivity of the experiment is 2.9×1024yr and surpasses the sensitivity of previous searches. We find no evidence for neutrinoless double-beta decay of Te130 and place a Bayesian lower bound on the decay half-life, T1/20ν>2.7×1024yr at 90% C.L. Combining CUORE-0 data with the 19.75 kg yr exposure of Te130 from the Cuoricino experiment we obtain T1/20ν>4.0×1024yr at 90% C.L. (Bayesian), the most stringent limit to date on this half-life. Using a range of nuclear matrix element estimates we interpret this as a limit on the effective Majorana neutrino mass, mββ

Published
2015
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11. CUORE-0 results and prospects for the CUORE experiment

Author

Cremonesi, O, Artusa, DR, Avignone, FT, Azzolini, O, Balata, M, Banks, TI, Bari, G, Beeman, J, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Camacho, A, Caminata, A, Canonica, L, Cao, X, Capelli, S, Cappelli, L, Carbone, L, Cardani, L, Casali, N, Cassina, L, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Creswick, RJ, Cushman, JS, Dafinei, I, Dally, A, Datskov, V, Dell'oro, S, Deninno, MM, Di Domizio, S, Di Vacri, ML, Drobizhev, A, Ejzak, L, Fang, DQ, Farach, HA, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Heeger, KM, Hennings-Yeomans, R, Hickerson, KP, Huang, HZ, Kadel, R, Keppel, G, Kolomensky, YG, Li, YL, Ligi, C, Lim, KE, Liu, X, Ma, YG, Maiano, C, Maino, M, Martinez, M, Maruyama, RH, Mei, Y, and Moggi, N

Abstract

© 2015 AIP Publishing LLC. With 741 kg of TeO2crystals and an excellent energy resolution of 5 keV (0.2%) at the region of interest, the CUORE (Cryogenic Underground Observatory for Rare Events) experiment aims at searching for neutrinoless double beta decay of130Te with unprecedented sensitivity. Expected to start data taking in 2015, CUORE is currently in an advanced construction phase at LNGS. CUORE projected neutrinoless double beta decay half-life sensitivity is 1.6 × 1026y at 1σ (9.5 × 1025y at the 90 % confidence level), in five years of live time, corresponding to an upper limit on the effective Majorana mass in the range 40-100 meV (50-130 meV). Further background rejection with auxiliary bolometric detectors could improve CUORE sensitivity and competitiveness of bolometric detectors towards a full analysis of the inverted neutrino mass hierarchy. CUORE-0 was built to test and demonstrate the performance of the upcoming CUORE experiment. It consists of a single CUORE tower (52 TeO2bolometers of 750 g each, arranged in a 13 floor structure) constructed strictly following CUORE recipes both for materials and assembly procedures. An experiment its own, CUORE-0 is expected to reach a sensitivity to the ββ(0ν) half-life of130Te around 3×1024y in one year of live time. We present an update of the data, corresponding to an exposure of 18.1 kg y. An analysis of the background indicates that the CUORE performance goal is satisfied while the sensitivity goal is within reach.

Published
2015
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12. CUORE and Beyond: Bolometric Techniques to Explore Inverted Neutrino Mass Hierarchy

Author

Artusa, DR, Avignone, FT, Azzolini, O, Balata, M, Banks, TI, Bari, G, Beeman, J, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Cai, XZ, Camacho, A, Canonica, L, Cao, XG, Capelli, S, Carbone, L, Cardani, L, Carrettoni, M, Casali, N, Chiesa, D, Chott, N, Clemenza, M, Copello, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Dafinei, I, Dally, A, Datskov, V, De Biasi, A, Deninno, MM, Di Domizio, S, Di Vacri, ML, Ejzak, L, Fang, DQ, Farach, HA, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Goett, J, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Heeger, KM, Hennings-Yeomans, R, Huang, HZ, Kadel, R, Kazkaz, K, Keppel, G, Kolomensky, YG, Li, YL, Ligi, C, Liu, X, Ma, YG, Maiano, C, Maino, M, Martinez, M, Maruyama, RH, Mei, Y, Moggi, N, Morganti, S, and Napolitano, T

Abstract

© 2015 Published by Elsevier B.V. The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay of 130Te. With 741 kg of TeO2 crystals and an excellent energy resolution of 5 keV (0.2%) at the region of interest, CUORE will be one of the most competitive neutrinoless double beta decay experiments on the horizon. With five years of live time, CUORE projected neutrinoless double beta decay half-life sensitivity is 1.6 × 1026 y at 1σ (9.5 × 1025 y at the 90% confidence level), which corresponds to an upper limit on the effective Majorana mass in the range 40-100 meV (50-130 meV). Further background rejection with auxiliary light detector can significantly improve the search sensitivity and competitiveness of bolometric detectors to fully explore the inverted neutrino mass hierarchy with 130Te and possibly other double beta decay candidate nuclei.

Published
2015
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13. Initial performance of the CUORE-0 experiment

Author

Artusa, DR, Avignone, FT, Azzolini, O, Balata, M, Banks, TI, Bari, G, Beeman, J, Bellini, F, Bersani, A, Biassoni, M, Brofferio, C, Bucci, C, Cai, XZ, Canonica, L, Cao, XG, Capelli, S, Carbone, L, Cardani, L, Carrettoni, M, Casali, N, Chiesa, D, Chott, N, Clemenza, M, Cosmelli, C, Cremonesi, O, Creswick, RJ, Dafinei, I, Dally, A, Datskov, V, Deninno, MM, Di Domizio, S, di Vacri, ML, Ejzak, L, Fang, DQ, Farach, HA, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Goett, J, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Heeger, KM, Hennings-Yeomans, R, Huang, HZ, Kadel, R, Kazkaz, K, Keppel, G, Kolomensky, YG, Li, YL, Lim, KE, Liu, X, Ma, YG, Maiano, C, Maino, M, Martinez, M, Maruyama, RH, Mei, Y, Moggi, N, Morganti, S, Nisi, S, Nones, C, and Norman, EB

Abstract

© 2014, The Author(s). CUORE-0 is a cryogenic detector that uses an array of tellurium dioxide bolometers to search for neutrinoless double-beta decay of (Formula presented.). We present the first data analysis with (Formula presented.) of total (Formula presented.) exposure focusing on background measurements and energy resolution. The background rates in the neutrinoless double-beta decay region of interest (2.47 to (Formula presented.)) and in the (Formula presented.) background-dominated region (2.70 to (Formula presented.)) have been measured to be (Formula presented.) and (Formula presented.), respectively. The latter result represents a factor of 6 improvement from a predecessor experiment, Cuoricino. The results verify our understanding of the background sources in CUORE-0, which is the basis of extrapolations to the full CUORE detector. The obtained energy resolution (full width at half maximum) in the region of interest is (Formula presented.). Based on the measured background rate and energy resolution in the region of interest, CUORE-0 half-life sensitivity is expected to surpass the observed lower bound of Cuoricino with one year of live time.

Published
2014
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14. First CUORE-0 performance results and status of CUORE experiment

Author

Canonica, L, Artusa, DR, Avignone, FT, Azzolini, O, Balata, M, Banks, TI, Bari, G, Beeman, J, Bellini, F, Bersani, A, Biassoni, M, Bloxham, T, Brofferio, C, Bucci, C, Cai, XZ, Camacho, A, Cao, X, Capelli, S, Carbone, L, Cardani, L, Carrettoni, M, Casali, N, Chiesa, D, Chott, N, Clemenza, M, Cosmelli, C, Cremonesi, O, Creswick, RJ, Dafinei, I, Dally, A, Datskov, V, De Biasi, A, Deninno, MM, Di Domizio, S, Di Vacri, ML, Ejzak, L, Faccini, R, Fang, DQ, Farach, HA, Faverzani, M, Fernandes, G, Ferri, E, Ferroni, F, Fiorini, E, Franceschi, MA, Freedman, SJ, Fujikawa, BK, Giachero, A, Gironi, L, Giuliani, A, Goett, J, Gorla, P, Gotti, C, Gutierrez, TD, Haller, EE, Han, K, Heeger, KM, Huang, HZ, Kadel, R, Kazkaz, K, Keppel, G, Kogler, L, Kolomensky, YG, Lenz, D, Li, YL, Ligi, C, Liu, X, Ma, YG, Maiano, C, and Maino, M

Abstract

The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay in130Te. Observation of the process would unambiguously establish that neutrinos are Majorana particles as well as provide information about the absolute neutrino mass scale and mass hierarchy.The CUORE setup will consist of an array of 988 tellurium dioxide crystals (containing 206 kg of130Te in total), operated as bolometers at a temperature of ∼10mK. The experiment is now under construction at the Gran Sasso National Laboratory in Italy. As a first step towards CUORE, a tower (CUORE-0) has been assembled and is taking data. Here a detailed description of the CUORE-0 tower and its performance is reported. The status of the CUORE experiment and its expected sensitivity will then be discussed. © 2014 Springer Science+Business Media New York.

Published
2014
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15. Search for double-β decay of 130Te to the first 0+excited state of 130Xe with the CUORICINO experiment bolometer array

Author

Andreotti, E, Arnaboldi, C, Avignone, FT, Balata, M, Bandac, I, Barucci, M, Beeman, JW, Bellini, F, Brofferio, C, Bryant, A, Bucci, C, Canonica, L, Capelli, S, Carbone, L, Carrettoni, M, Clemenza, M, Cremonesi, O, Creswick, RJ, Di Domizio, S, Dolinski, MJ, Ejzak, L, Faccini, R, Farach, HA, Ferri, E, Fiorini, E, Foggetta, L, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Guardincerri, E, Gutierrez, TD, Haller, EE, Kazkaz, K, Kogler, L, Kraft, S, Maiano, C, Martinez, C, Martinez, M, Maruyama, RH, Newman, S, Nisi, S, Nones, C, Norman, EB, Nucciotti, A, Orio, F, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Risegari, L, Rosenfeld, C, Rusconi, C, and Salvioni, C

Abstract

The CUORICINO experiment was an array of 62 TeO2single-crystal bolometers with a total 130Te mass of 11.3kg. The experiment finished in 2008 after more than 3 yr of active operating time. Searches for both 0ν and 2ν double-β decay to the first excited 0+state in 130Xe were performed by studying different coincidence scenarios. The analysis was based on data representing a total exposure of N(130Te)•t=9.5×1025yr. No evidence for a signal was found. The resulting lower limits on the half-lives are T122ν(130Te→130Xe*)>1. 3×1023yr (90% C.L.), and T120ν(130Te→130Xe*)>9.4×1023yr (90% CL). ©2012 American Physical Society.

Published
2012
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16. 130Te neutrinoless double-beta decay with CUORICINO

Author

Andreotti, E, Arnaboldi, C, Avignone, FT, Balata, M, Bandac, I, Barucci, M, Beeman, JW, Bellini, F, Brofferio, C, Bryant, A, Bucci, C, Canonica, L, Capelli, S, Carbone, L, Carrettoni, M, Clemenza, M, Cremonesi, O, Creswick, RJ, Di Domizio, S, Dolinski, MJ, Ejzak, L, Faccini, R, Farach, HA, Ferri, E, Fiorini, E, Foggetta, L, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Guardincerri, E, Gutierrez, TD, Haller, EE, Kazkaz, K, Kraft, S, Kogler, L, Maiano, C, Maruyama, RH, Martinez, C, Martinez, M, Newman, S, Nisi, S, Nones, C, Norman, EB, Nucciotti, A, Orio, F, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Risegari, L, Rosenfeld, C, Rusconi, C, Salvioni, C, Sangiorgio, S, Schaeffer, D, Scielzo, ND, Sisti, M, Smith, AR, Tomei, C, Ventura, G, and Vignati, M

Abstract

We report the final result of the CUORICINO experiment. Operated between 2003 and 2008, with a total exposure of 19.75 kg · y of 130Te, CUORICINO was able to set a lower bound on the 130Te 0νββ half-life of 2.8 × 1024 years at 90% C.L. The limit here reported includes the effects of systematic uncertainties that are examined in detail in the paper. The corresponding upper bound on the neutrino Majorana mass is in the range 300-710 meV, depending on the adopted nuclear matrix element evaluation. © 2011 Elsevier B.V. All rights reserved.

Published
2011
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17. Search for β+/EC double beta decay of 120Te

Author

Andreotti, E, Arnaboldi, C, Avignone, FT, Balata, M, Bandac, I, Barucci, M, Beeman, JW, Bellini, F, Brofferio, C, Bryant, A, Bucci, C, Canonica, L, Capelli, S, Carbone, L, Carrettoni, M, Clemenza, M, Cremonesi, O, Creswick, RJ, Di Domizio, S, Dolinski, MJ, Ejzak, L, Faccini, R, Farach, HA, Ferri, E, Fiorini, E, Foggetta, L, Giachero, A, Gironi, L, Giuliani, A, Gorla, P, Guardincerri, E, Gutierrez, TD, Haller, EE, Kazkaz, K, Kraft, S, Kogler, L, Maiano, C, Maruyama, RH, Martinez, C, Martinez, M, Newman, S, Nisi, S, Nones, C, Norman, EB, Nucciotti, A, Orio, F, Pallavicini, M, Palmieri, V, Pattavina, L, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Risegari, L, Rosenfeld, C, Rusconi, C, Salvioni, C, Sangiorgio, S, Schaeffer, D, Scielzo, ND, Sisti, M, Smith, AR, Tomei, C, Ventura, G, and Vignati, M

Abstract

We present a search for β+/EC double beta decay of 120Te performed with the CUORICINO experiment, an array of TeO2 cryogenic bolometers. After collecting 0.0573 kg · y of 120Te, we see no evidence of a signal and therefore set the following limits on the half-life: T1/20ν>1.9·1021 y at 90% C.L. for the 0ν mode and T1/22ν>7.6·1019 y at 90% C.L. for the 2ν mode. These results improve the existing limits by almost three orders of magnitude (four in the case of 0ν mode). © 2011 Published by Elsevier B.V.

Published
2011
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18. Results from a search for the 0 νββ-decay of Te130

Author

ARNABOLDI, CLAUDIO, BROFFERIO, CHIARA, CAPELLI, SILVIA, CLEMENZA, MASSIMILIANO, CREMONESI, OLIVIERO, FIORINI, ETTORE, GIACHERO, ANDREA, GIULIANI, ANDREA, GORLA, PAOLO, NONES, CLAUDIA, NUCCIOTTI, ANGELO ENRICO LODOVICO, PAVAN, MAURA, PESSINA, GIANLUIGI EZIO, PREVITALI, EZIO, SISTI, MONICA, Artusa, DR, Avignone III, FT, Balata, M, Bandac, I, Barucci, M, Beeman, JW, Bellini, F, Bucci, C, Carbone, L, Cebrian, S, Creswick, RJ, de Waard, A, Di Domizio, S, Dolinski, MJ, Farach, HA, Frossati, G, Guardincerri, E, Gutierrez, TD, Haller, EE, Maruyama, RH, McDonald, RJ, Nisi, S, Norman, EB, Olivieri, E, Pallavicini, M, Palmieri, E, Pasca, E, Pedretti, M, Pirro, S, Risegari, L, Rosenfeld, C, Sangiorgio, S, Smith, AR, Torres, L, Ventura, G, Vignati, M, Arnaboldi, C., Arnaboldi, C, Artusa, D, Avignone III, F, Balata, M, Bandac, I, Barucci, M, Beeman, J, Bellini, F, Brofferio, C, Bucci, C, Capelli, S, Carbone, L, Cebrian, S, Clemenza, M, Cremonesi, O, Creswick, R, de Waard, A, Di Domizio, S, Dolinski, M, Farach, H, Fiorini, E, Frossati, G, Giachero, A, Giuliani, A, Gorla, P, Guardincerri, E, Gutierrez, T, Haller, E, Maruyama, R, Mcdonald, R, Nisi, S, Nones, C, Norman, E, Nucciotti, A, Olivieri, E, Pallavicini, M, Palmieri, E, Pasca, E, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Risegari, L, Rosenfeld, C, Sangiorgio, S, Sisti, M, Smith, A, Torres, L, Ventura, G, and Vignati, M

Subjects
FIS/01 - FISICA SPERIMENTALE, Weak-interaction and lepton (including neutrino) aspects of 0nu beta beta-decay, Properties of nuclei with 90, Nuclear lifetimes, width, 0nu beta beta-decay relation with nuclear matrix elements and nuclear structure, Tellurium-130, Double Beta Decay, Bolometers, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Abstract

A detailed description of the CUORICINO Te130 neutrinoless double-beta (0 νββ) decay experiment is given and recent results are reported. CUORICINO is an array of 62 tellurium oxide (TeO2) bolometers with an active mass of 40.7 kg. It is cooled to ~8-10 mK by a dilution refrigerator shielded from environmental radioactivity and energetic neutrons. It is running in the Laboratori Nazionali del Gran Sasso (LNGS) in Assergi, Italy. These data represent an exposure of 11.83 kg yr or 91 mole-years of Te130. No evidence for 0νββ-decay was observed and a limit of T1/20ν(130Te)≥3. 0×1024y (90% CL) is set. This corresponds to an upper limit on the effective mass, mν, between 0.19 and 0.68 eV when analyzed with the many published nuclear structure calculations. In the context of these nuclear models, the values fall within the range corresponding to the claim of evidence of 0νββ-decay by H. V. Klapdor-Kleingrothaus The experiment continues to acquire data.

Published
2008

19. Results from a search for the 0 v beta beta-delay of Te-130

Author

Arnaboldi, C, Artusa, Dr, Avignone, Ft, Balata, M, Bandac, I, Barucci, M, Beeman, Jw, Bellini, F, Brofferio, C, Bucci, C, Capelli, S, Carbone, L, Cebrian, S, Clemenza, M, Cremonesi, O, Creswick, Rj, DE WAARD, A, DI DOMIZIO, S, Dolinski, Mj, Farach, Ha, Fiorini, E, Frossati, G, Giachero, A, Giuliani, ANDREA ERNESTO GUIDO, Gorla, P, Guardincerri, E, Gutierrez, Td, Haller, Ee, Maruyama, Rh, Mcdonald, Rj, Nisi, S, Nones, C, Norman, Eb, Nucciotti, A, Olivieri, E, Pallavicini, M, Palmieri, E, Pasca, E, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Risegari, L, Rosenfeld, C, Sangiorgio, S, Sisti, M, Smith, Ar, Torres, L, Ventura, G, and Vignati, M.

Published
2008

20. CUORICINO and CUORE, bolometric experiments for Double Beta Decay Research

Author

CAPELLI, SILVIA, ARNABOLDI, CLAUDIO, BROFFERIO, CHIARA, CAPOZZI, FRANCESCA, CLEMENZA, MASSIMILIANO, FIORINI, ETTORE, GIULIANI, ANDREA, GORLA, PAOLO, NONES, CLAUDIA, NUCCIOTTI, ANGELO ENRICO LODOVICO, PAVAN, MAURA, SISTI, MONICA, ZANOTTI, LUIGI ERNESTO, Ardito R, Artusa DR, Avignone FT III, Balata M, Bandac I, Barucci M, Beeman, JW, Bellini, F, Bucci, C, Carbone, L, Cebrian, S, Cosmelli, C, Cremonesi, O, Creswick, RJ, Dafinei, I, De Waard, A, Diemoz, M, Dolinski, M, Farach, HA, Ferroni, F, Frossati, G, Gargiulo, C, Guardincerri, E, Gutierrez, TD, Haller, EE, Irastorza, IG, Longo, E, Maier, G, Maruyama, R, Morganti, S, Nisi, S, Norman, EB, Olivieri, E, Ottonello, P, Pallavicini, M, Palmieri, V, Pasca, E, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Quiter, B, Risegari, L, Rosenfeld, C, Sangiorgio, S, Smith, AR, Toffanin, S, Torres, L, Ventura, G, Xu, N, Capelli, S, Ardito, R, Arnaboldi, C, Artusa, D, Avignone FT, I, Balata, M, Bandac, I, Barucci, M, Beeman, J, Bellini, F, Brofferio, C, Bucci, C, Capozzi, F, Carbone, L, Cebrian, S, Clemenza, M, Cosmelli, C, Cremonesi, O, Creswick, R, Dafinei, I, De Waard, A, Diemoz, M, Dolinski, M, Farach, H, Ferroni, F, Fiorini, E, Frossati, G, Gargiulo, C, Guardincerri, E, Giuliani, A, Gorla, P, Gutierrez, T, Haller, E, Irastorza, I, Longo, E, Maier, G, Maruyama, R, Morganti, S, Nisi, S, Nones, C, Norman, E, Nucciotti, A, Olivieri, E, Ottonello, P, Pallavicini, M, Palmieri, V, Pasca, E, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Quiter, B, Risegari, L, Rosenfeld, C, Sangiorgio, S, Sisti, M, Smith, A, Toffanin, S, Torres, L, Ventura, G, Xu, N, and Zanotti, L

Subjects
bolometer, double beta decay, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Published
2007

21. CUORICINO and CUORE R&D

Author

CAPELLI, SILVIA, Ardito, R, ARNABOLDI, CLAUDIO, Artusa, DR, Avignone, FT, Balata, M, Bandac, I, Barucci, M, Beeman, JW, Bellini, F, BROFFERIO, CHIARA, Bucci, C, CAPOZZI, FRANCESCA, Carbone, L, Cebrian, S, CLEMENZA, MASSIMILIANO, Cosmelli, C, Cremonesi, O, Creswick, RJ, Dafinei, I, De Waard, A, Diemoz, M, Dolinsky, M, Farach, HA, Ferroni, F, FIORINI, ETTORE, Frossati, G, Gargiulo, C, Guardincerri, E, GIULIANI, ANDREA, GORLA, PAOLO, Gutierrez, TD, Haller, EE, Irastorza, IG, Longo, E, Maier, G, Marujama, R, Morganti, S, Nisi, S, NONES, CLAUDIA, Norman, EB, NUCCIOTTI, ANGELO ENRICO LODOVICO, Olivieri, E, Ottonello, P, Pallavicini, M, Palmieri, V, Pasca, E, PAVAN, MAURA, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Quinter, B, Risegari, L, Rosenfeld, C, Sangiorgio, S, SISTI, MONICA, Smith, AR, Toffanin, S, Torres, L, Ventura, G, Xu, N, ZANOTTI, LUIGI ERNESTO, Capelli, S, Ardito, R, Arnaboldi, C, Artusa, D, Avignone, F, Balata, M, Bandac, I, Barucci, M, Beeman, J, Bellini, F, Brofferio, C, Bucci, C, Capozzi, F, Carbone, L, Cebrian, S, Clemenza, M, Cosmelli, C, Cremonesi, O, Creswick, R, Dafinei, I, De Waard, A, Diemoz, M, Dolinsky, M, Farach, H, Ferroni, F, Fiorini, E, Frossati, G, Gargiulo, C, Guardincerri, E, Giuliani, A, Gorla, P, Gutierrez, T, Haller, E, Irastorza, I, Longo, E, Maier, G, Marujama, R, Morganti, S, Nisi, S, Nones, C, Norman, E, Nucciotti, A, Olivieri, E, Ottonello, P, Pallavicini, M, Palmieri, V, Pasca, E, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Previtali, E, Quinter, B, Risegari, L, Rosenfeld, C, Sangiorgio, S, Sisti, M, Smith, A, Toffanin, S, Torres, L, Ventura, G, Xu, N, and Zanotti, L

Subjects
bolometer, double beta decay, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Published
2006

22. Effect of native defects on optical properties of InxGa1-xN alloys

Author

Li, SX, Haller, EE, Yu, KM, Walukiewicz, W, Ager, JW, Wu, J, Shan, W, Lu, H, and Schaff, WJ

Abstract

The energy position of the optical-absorption edge and the free-carrier populations in Inx Ga1-x N ternary alloys can be controlled using high-energy He+4 irradiation. The blueshift of the absorption edge after irradiation in In-rich material (x>0.34) is attributed to the band-filling effect (Burstein-Moss shift) due to the native donors introduced by the irradiation. In Ga-rich material, optical-absorption measurements show that the irradiation-introduced native defects are inside the band gap, where they are incorporated as acceptors. The observed irradiation-produced changes in the optical-absorption edge and the carrier populations in Inx Ga1-x N are in excellent agreement with the predictions of the amphoteric defect model. © 2005 American Institute of Physics.

Published
2005
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23. Preliminary results on the search for the neutrinoless double beta decay of130Te with the cuoricino experiment

Author

Nucciotti, A, Arnaboldi, C, Artusa, DR, Avignone, FT, Balata, M, Bandac, I, Barucci, M, Beeman, J, Brofferio, C, Bucci, C, Capelli, S, Capozzi, F, Carbone, L, Cebrian, S, Cremonesi, O, Creswick, RJ, De Waard, A, Farach, HA, Fascilla, A, Fiorini, E, Frossati, G, Giuliani, A, Gorla, P, Haller, EE, Irastorza, IG, McDonald, RJ, Morales, A, Norman, EB, Olivieri, E, Palmieri, V, Pasca, E, Pavan, M, Pedretti, M, Pessina, G, Pirro, S, Pobes, C, Previtali, E, Pyle, M, Risegari, L, Rosenfeld, C, Sisti, M, Smith, AR, Torres, L, and Ventura, G

Abstract

© 2003, Springer-Verlag, Società Italiana di Fisica. The search for neutrinoless double beta decay (DBD-0ν) is a powerful tool to establish the correct neutrino mass hierarchy and whether the neutrino is a Majorana or Dirac particle. The Milano group has run several experiments using thermal detectors to search for the 130Te DBD-0ν. The Cuoricino experiment consists of an array of 62 TeO2 thermal detectors for a total mass of about 40 kg, by far the largest cryogenic experiment in the world. The detector installation in the Gran Sasso Underground Laboratory has been recently completed. After a test phase the experiment is now taking data and we report here the preliminary results. Cuoricino is the first step toward the CUORE experiment, which will consists of 1000 TeO2 thermal detectors for a total mass of about 760 kg: in this paper we discuss also the physics potential of both stages for what concerns the DBD-0ν search. PACS: 11.30.Fs Lepton number – 14.60.Pq Neutrino mass and mixing – 23.40.Bw Weak interactions in beta decay

Published
2004
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24. Present and future cryogenic experiments on double-beta decay

Author

Brofferio, C, Arnaboldi, C, Capelli, S, Carbone, L, Cremonesi, O, Fiorini, E, Giugni, D, Negri, P, Nucciotti, A, Pavan, M, Pessina, G, Pirro, S, Previtali, E, Sisti, M, Vanzini, M, Zanotti, L, Beeman, J, Mcdonald, Rj, Haller, Ee, Norman, Eb, Smith, Ar, Giuliani, ANDREA ERNESTO GUIDO, Pedretti, M, Barucci, M, Ventura, G, Balata, M, Bucci, C, Pobes, C, Palmieri, V, Frossati, G, DE WAARD, A, Avignone, Ft, Creswick, Rj, Farach, Ha, Rosenfeld, C, Cebrian, S, Irastorz, Ig, Morales, A., Brofferio, C, Arnaboldi, C, Capelli, S, Carbone, L, Cremonesi, O, Fiorini, E, Giugni, D, Negri, P, Nucciotti, A, Pavan, M, Pessina, G, Pirro, S, Previtali, E, Sisti, M, Vanzini, M, Zanotti, L, Beeman, J, Mcdonald, R, Haller, E, Norman, E, Smith, A, Giuliani, A, Pedretti, M, Barucci, M, Ventura, G, Balata, M, Bucci, C, Pobes, C, Palmieri, V, Frossati, G, de Waard, A, Avignone, F, Creswick, R, Farach, H, Rosenfeld, C, Cebrian, S, Irastorza, I, and Morales, A

Subjects
Neutrino mass, Double-beta decay, Cryogenic detector, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Abstract

Thermal detectors are introduced and their possible impact on neutrinoless double-beta-decay (2β0ν) search is discussed. The thermal experiment MIBETA is described, reporting the up-to-date limits on 130Te and 128Te. A new generation experiment, consisting in a large expansion of MIBETA and known as CUORE, is presented and discussed.

Published
2002

25. First Results from CUORE: A Search for Lepton Number Violation via 0νββ Decay of ^{130}Te.

Author

Alduino C, Alessandria F, Alfonso K, Andreotti E, Arnaboldi C, Avignone FT, Azzolini O, Balata M, Bandac I, Banks TI, Bari G, Barucci M, Beeman JW, Bellini F, Benato G, Bersani A, Biare D, Biassoni M, Bragazzi F, Branca A, Brofferio C, Bryant A, Buccheri A, Bucci C, Bulfon C, Camacho A, Caminata A, Canonica L, Cao XG, Capelli S, Capodiferro M, Cappelli L, Cardani L, Cariello M, Carniti P, Carrettoni M, Casali N, Cassina L, Cereseto R, Ceruti G, Chiarini A, Chiesa D, Chott N, Clemenza M, Conventi D, Copello S, Cosmelli C, Cremonesi O, Crescentini C, Creswick RJ, Cushman JS, D'Addabbo A, D'Aguanno D, Dafinei I, Datskov V, Davis CJ, Del Corso F, Dell'Oro S, Deninno MM, Di Domizio S, Di Vacri ML, Di Paolo L, Drobizhev A, Ejzak L, Faccini R, Fang DQ, Faverzani M, Ferri E, Ferroni F, Fiorini E, Franceschi MA, Freedman SJ, Fujikawa BK, Gaigher R, Giachero A, Gironi L, Giuliani A, Gladstone L, Goett J, Gorla P, Gotti C, Guandalini C, Guerzoni M, Gutierrez TD, Haller EE, Han K, Hansen EV, Heeger KM, Hennings-Yeomans R, Hickerson KP, Huang HZ, Iannone M, Ioannucci L, Kadel R, Keppel G, Kogler L, Kolomensky YG, Leder A, Ligi C, Lim KE, Liu X, Ma YG, Maiano C, Maino M, Marini L, Martinez M, Martinez Amaya C, Maruyama RH, Mei Y, Moggi N, Morganti S, Mosteiro PJ, Nagorny SS, Napolitano T, Nastasi M, Nisi S, Nones C, Norman EB, Novati V, Nucciotti A, Nutini I, O'Donnell T, Olcese M, Olivieri E, Orio F, Orlandi D, Ouellet JL, Pagliarone CE, Pallavicini M, Palmieri V, Pattavina L, Pavan M, Pedretti M, Pedrotta R, Pelosi A, Pessina G, Pettinacci V, Piperno G, Pira C, Pirro S, Pozzi S, Previtali E, Reindl F, Rimondi F, Risegari L, Rosenfeld C, Rossi C, Rusconi C, Sakai M, Sala E, Salvioni C, Sangiorgio S, Santone D, Schaeffer D, Schmidt B, Schmidt J, Scielzo ND, Singh V, Sisti M, Smith AR, Stivanello F, Taffarello L, Tatananni L, Tenconi M, Terranova F, Tessaro M, Tomei C, Ventura G, Vignati M, Wagaarachchi SL, Wallig J, Wang BS, Wang HW, Welliver B, Wilson J, Wilson K, Winslow LA, Wise T, Zanotti L, Zarra C, Zhang GQ, Zhu BX, Zimmermann S, and Zucchelli S

Abstract

The CUORE experiment, a ton-scale cryogenic bolometer array, recently began operation at the Laboratori Nazionali del Gran Sasso in Italy. The array represents a significant advancement in this technology, and in this work we apply it for the first time to a high-sensitivity search for a lepton-number-violating process: ^{130}Te neutrinoless double-beta decay. Examining a total TeO&#95;{2} exposure of 86.3 kg yr, characterized by an effective energy resolution of (7.7±0.5)  keV FWHM and a background in the region of interest of (0.014±0.002)  counts/(keV kg yr), we find no evidence for neutrinoless double-beta decay. Including systematic uncertainties, we place a lower limit on the decay half-life of T&#95;{1/2}^{0ν}(^{130}Te)>1.3×10^{25}  yr (90% C.L.); the median statistical sensitivity of this search is 7.0×10^{24}  yr. Combining this result with those of two earlier experiments, Cuoricino and CUORE-0, we find T&#95;{1/2}^{0ν}(^{130}Te)>1.5×10^{25}  yr (90% C.L.), which is the most stringent limit to date on this decay. Interpreting this result as a limit on the effective Majorana neutrino mass, we find m&#95;{ββ}<(110-520)  meV, where the range reflects the nuclear matrix element estimates employed.

Published
2018
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26. Magnetic effects in sulfur-decorated graphene.

Author

Hwang C, Cybart SA, Shin SJ, Kim S, Kim K, Rappoport TG, Wu SM, Jozwiak C, Fedorov AV, Mo SK, Lee DH, Min BI, Haller EE, Dynes RC, Castro Neto AH, and Lanzara A

Abstract

The interaction between two different materials can present novel phenomena that are quite different from the physical properties observed when each material stands alone. Strong electronic correlations, such as magnetism and superconductivity, can be produced as the result of enhanced Coulomb interactions between electrons. Two-dimensional materials are powerful candidates to search for the novel phenomena because of the easiness of arranging them and modifying their properties accordingly. In this work, we report magnetic effects in graphene, a prototypical non-magnetic two-dimensional semi-metal, in the proximity with sulfur, a diamagnetic insulator. In contrast to the well-defined metallic behaviour of clean graphene, an energy gap develops at the Fermi energy for the graphene/sulfur compound with decreasing temperature. This is accompanied by a steep increase of the resistance, a sign change of the slope in the magneto-resistance between high and low fields, and magnetic hysteresis. A possible origin of the observed electronic and magnetic responses is discussed in terms of the onset of low-temperature magnetic ordering. These results provide intriguing insights on the search for novel quantum phases in graphene-based compounds.

Published
2016
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27. Electron Spin Coherence of Shallow Donors in Natural and Isotopically Enriched Germanium.

Author

Sigillito AJ, Jock RM, Tyryshkin AM, Beeman JW, Haller EE, Itoh KM, and Lyon SA

Abstract

Germanium is a widely used material for electronic and optoelectronic devices and recently it has become an important material for spintronics and quantum computing applications. Donor spins in silicon have been shown to support very long coherence times (T&#95;{2}) when the host material is isotopically enriched to remove any magnetic nuclei. Germanium also has nonmagnetic isotopes so it is expected to support long T&#95;{2}'s while offering some new properties. Compared to Si, Ge has a strong spin-orbit coupling, large electron wave function, high mobility, and highly anisotropic conduction band valleys which will all give rise to new physics. In this Letter, the first pulsed electron spin resonance measurements of T&#95;{2} and the spin-lattice relaxation (T&#95;{1}) times for ^{75}As and ^{31}P donors in natural and isotopically enriched germanium are presented. We compare samples with various levels of isotopic enrichment and find that spectral diffusion due to ^{73}Ge nuclear spins limits the coherence in samples with significant amounts of ^{73}Ge. For the most highly enriched samples, we find that T&#95;{1} limits T&#95;{2} to T&#95;{2}=2T&#95;{1}. We report an anisotropy in T&#95;{1} and the ensemble linewidths for magnetic fields oriented along different crystal axes but do not resolve any angular dependence to the spectral-diffusion-limited T&#95;{2} in samples with ^{73}Ge.

Published
2015
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28. Search for Neutrinoless Double-Beta Decay of (130)Te with CUORE-0.

Author

Alfonso K, Artusa DR, Avignone FT 3rd, Azzolini O, Balata M, Banks TI, Bari G, Beeman JW, Bellini F, Bersani A, Biassoni M, Brofferio C, Bucci C, Caminata A, Canonica L, Cao XG, Capelli S, Cappelli L, Carbone L, Cardani L, Casali N, Cassina L, Chiesa D, Chott N, Clemenza M, Copello S, Cosmelli C, Cremonesi O, Creswick RJ, Cushman JS, Dafinei I, Dally A, Dell'Oro S, Deninno MM, Di Domizio S, Di Vacri ML, Drobizhev A, Ejzak L, Fang DQ, Faverzani M, Fernandes G, Ferri E, Ferroni F, Fiorini E, Freedman SJ, Fujikawa BK, Giachero A, Gironi L, Giuliani A, Gorla P, Gotti C, Gutierrez TD, Haller EE, Han K, Hansen E, Heeger KM, Hennings-Yeomans R, Hickerson KP, Huang HZ, Kadel R, Keppel G, Kolomensky YG, Lim KE, Liu X, Ma YG, Maino M, Martinez M, Maruyama RH, Mei Y, Moggi N, Morganti S, Nisi S, Nones C, Norman EB, Nucciotti A, O'Donnell T, Orio F, Orlandi D, Ouellet JL, Pagliarone CE, Pallavicini M, Palmieri V, Pattavina L, Pavan M, Pedretti M, Pessina G, Pettinacci V, Piperno G, Pirro S, Pozzi S, Previtali E, Rosenfeld C, Rusconi C, Sala E, Sangiorgio S, Santone D, Scielzo ND, Sisti M, Smith AR, Taffarello L, Tenconi M, Terranova F, Tomei C, Trentalange S, Ventura G, Vignati M, Wagaarachchi SL, Wang BS, Wang HW, Wielgus L, Wilson J, Winslow LA, Wise T, Zanotti L, Zarra C, Zhang GQ, Zhu BX, and Zucchelli S

Abstract

We report the results of a search for neutrinoless double-beta decay in a 9.8 kg yr exposure of (130)Te using a bolometric detector array, CUORE-0. The characteristic detector energy resolution and background level in the region of interest are 5.1±0.3  keV FWHM and 0.058±0.004(stat)±0.002(syst)counts/(keV kg yr), respectively. The median 90% C.L. lower-limit half-life sensitivity of the experiment is 2.9×10(24)  yr and surpasses the sensitivity of previous searches. We find no evidence for neutrinoless double-beta decay of (130)Te and place a Bayesian lower bound on the decay half-life, T(1/2)(0ν)>2.7×10(24)  yr at 90% C.L. Combining CUORE-0 data with the 19.75 kg yr exposure of (130)Te from the Cuoricino experiment we obtain T(1/2)(0ν)>4.0×10(24)  yr at 90% C.L. (Bayesian), the most stringent limit to date on this half-life. Using a range of nuclear matrix element estimates we interpret this as a limit on the effective Majorana neutrino mass, m(ββ)<270-760  meV.

Published
2015
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29. Ultrafast direct modulation of a single-mode photonic crystal nanocavity light-emitting diode.

Author

Shambat G, Ellis B, Majumdar A, Petykiewicz J, Mayer MA, Sarmiento T, Harris J, Haller EE, and Vučković J

Abstract

Low-power and electrically controlled optical sources are vital for next generation optical interconnect systems to meet strict energy demands. Current optical transmitters consisting of high-threshold lasers plus external modulators consume far too much power to be competitive with future electrical interconnects. Here we demonstrate a directly modulated photonic crystal nanocavity light-emitting diode (LED) with 10 GHz modulation speed and less than 1 fJ per bit energy of operation, which is orders of magnitude lower than previous solutions. The device is electrically controlled and operates at room temperature, while the high modulation speed results from the fast relaxation of the quantum dots used as the active material. By virtue of possessing a small mode volume, our LED is intrinsically single mode and, therefore, useful for communicating information over a single narrowband channel. The demonstrated device is a major step forward in providing practical low-power and integrable sources for on-chip photonics.

Published
2011
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30. Ultra-low power fiber-coupled gallium arsenide photonic crystal cavity electro-optic modulator.

Author

Shambat G, Ellis B, Mayer MA, Majumdar A, Haller EE, and Vučković J

Abstract

We demonstrate a gallium arsenide photonic crystal cavity injection-based electro-optic modulator coupled to a fiber taper waveguide. The fiber taper serves as a convenient and tunable waveguide for cavity coupling with minimal loss. Localized electrical injection of carriers into the cavity region via a laterally doped p-i-n diode combined with the small mode volume of the cavity enable ultra-low energy modulation at sub-fJ/bit levels. Speeds of up to 1 GHz are demonstrated with photoluminescence lifetime measurements revealing that the ultimate limit goes well into the tens of GHz., (© 2011 Optical Society of America)

Published
2011
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31. Influence of molecular ordering on electrical and friction properties of ω-(trans-4-stilbene)alkylthiol self-assembled monolayers on Au(111).

Author

Qi Y, Liu X, Hendriksen BL, Navarro V, Park JY, Ratera I, Klopp JM, Edder C, Himpsel FJ, Fréchet JM, Haller EE, and Salmeron M

Subjects
Electrons, Particle Size, Sulfhydryl Compounds chemical synthesis, Surface Properties, Gold chemistry, Membranes, Artificial, Sulfhydryl Compounds chemistry
Abstract

The electrical and friction properties of ω-(trans-4-stilbene)alkylthiol self-assembled monolayers (SAMs) on Au(111) were investigated using atomic force microscopy (AFM) and near edge X-ray absorption fine structure spectroscopy (NEXAFS). The sample surface was uniformly covered with a molecular film consisting of very small grains. Well-ordered and flat monolayer islands were formed after the sample was heated in nitrogen at 120 °C for 1 h. While lattice resolved AFM images revealed a crystalline phase in the islands, the area between islands showed no order. The islands exhibit substantial reduction (50%) in friction, supporting the existence of good ordering. NEXAFS measurements revealed an average upright molecular orientation in the film, both before and after heating, with a narrower tilt-angle distribution for the heated fim. Conductance-AFM measurements revealed a 2 orders of magnitude higher conductivity on the ordered islands than on the disordered phase. We propose that the conductance enhancement is a result of a better π-π stacking between the trans-stilbene molecular units as a result of improved ordering in islands.

Published
2010
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32. Embedded binary eutectic alloy nanostructures: a new class of phase change materials.

Author

Shin SJ, Guzman J, Yuan CW, Liao CY, Boswell-Koller CN, Stone PR, Dubon OD, Minor AM, Watanabe M, Beeman JW, Yu KM, Ager JW 3rd, Chrzan DC, and Haller EE

Abstract

Phase change materials are essential to a number of technologies ranging from optical data storage to energy storage and transport applications. This widespread interest has given rise to a substantial effort to develop bulk phase change materials well suited for desired applications. Here, we suggest a novel and complementary approach, the use of binary eutectic alloy nanoparticles embedded within a matrix. Using GeSn nanoparticles embedded in silica as an example, we establish that the presence of a nanoparticle/matrix interface enables one to stabilize both nanobicrystal and homogeneous alloy morphologies. Further, the kinetics of switching between the two morphologies can be tuned simply by altering the composition.

Published
2010
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33. Transport of deposited atoms throughout strain-mediated self-assembly.

Author

Moutanabbir O, Miyamoto S, Haller EE, and Itoh KM

Abstract

Using enriched isotopes, we developed a method to elucidate the long-standing issue of Ge transport governing the strain-driven self-assembly. Here 76Ge was employed to form the 2D metastable layer on a Si(001) surface, while the 3D transition and growth were completed by additional evaporation of 70Ge. This isotope tracing combined with the analysis of the Ge-Ge LO phonon enables the tracking of the origin of Ge atoms and their flow towards the growing islands. This atomic transport was quantified based on the quasiharmonic approximation of Ge-Ge vibrations and described using a rate equation model.

Published
2010
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34. Nanoscale structural engineering via phase segregation: Au-Ge system.

Author

Chueh YL, Boswell CN, Yuan CW, Shin SJ, Takei K, Ho JC, Ko H, Fan Z, Haller EE, Chrzan DC, and Javey A

Abstract

A tunable structural engineering of nanowires based on template-assisted alloying and phase segregation processes is demonstrated. The Au-Ge system, which has a low eutectic temperature and negligible solid solubility (<10(-3) atom %) of Au in Ge at low temperatures, is utilized. Depending on the Au concentration of the initial nanowires, final structures ranging from nearly periodic nanodisk patterns to core/shell and fully alloyed nanowires are produced. The formation mechanisms are discussed in detail and characterized by in situ transmission electron microscopy and energy-dispersive spectrometry analyses. Electrical measurements illustrate the metallic and semiconducting characteristics of the fully alloyed and alternating Au/Ge nanodisk structures, respectively.

Published
2010
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35. Black Ge based on crystalline/amorphous core/shell nanoneedle arrays.

Author

Chueh YL, Fan Z, Takei K, Ko H, Kapadia R, Rathore AA, Miller N, Yu K, Wu M, Haller EE, and Javey A

Abstract

Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays with ultrasharp tips ( approximately 4 nm) enabled by the Ni catalyzed vapor-solid-solid growth process. Ge nanoneedle arrays exhibit remarkable optical properties. Specifically, minimal optical reflectance (<1%) is observed, even for high angles of incidence ( approximately 75 degrees ) and for relatively short nanoneedle lengths ( approximately 1 mum). Furthermore, the material exhibits high optical absorption efficiency with an effective band gap of approximately 1 eV. The reported black Ge could potentially have important practical implications for efficient photovoltaic and photodetector applications on nonconventional substrates.

Published
2010
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36. Spin susceptibility of noncentrosymmetric heavy-fermion superconductor CeIrSi3 under pressure: 29Si Knight-shift study on single crystal.

Author

Mukuda H, Ohara T, Yashima M, Kitaoka Y, Settai R, Onuki Y, Itoh KM, and Haller EE

Abstract

We report 29Si NMR study on a single crystal of the heavy-fermion superconductor CeIrSi3 without an inversion symmetry along the c axis. The 29Si Knight-shift measurements under pressure have revealed that the spin susceptibility for the ab plane decreases slightly below T(c), whereas along the c axis it does not change at all. The result can be accounted for by the spin susceptibility in the superconducting state being dominated by the strong antisymmetric (Rashba-type) spin-orbit interaction that originates from the absence of an inversion center along the c axis and it being much larger than superconducting condensation energy. This is the first observation which exhibits an anisotropy of the spin susceptibility below T(c) in the noncentrosymmetric superconductor dominated by strong Rashba-type spin-orbit interaction.

Published
2010
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37. Interstitial-mediated diffusion in germanium under proton irradiation.

Author

Bracht H, Schneider S, Klug JN, Liao CY, Lundsgaard Hansen J, Haller EE, Nylandsted Larsen A, Bougeard D, Posselt M, and Wündisch C

Abstract

We report experiments on the impact of 2.5 MeV proton irradiation on self-diffusion and dopant diffusion in germanium (Ge). Self-diffusion under irradiation reveals an unusual depth independent broadening of the Ge isotope multilayer structure. This behavior and the observed enhanced diffusion of B and retarded diffusion of P demonstrates that an interstitial-mediated diffusion process dominates in Ge under irradiation. This fundamental finding opens up unique ways to suppress vacancy-mediated diffusion in Ge and to solve the donor deactivation problem that hinders the fabrication of Ge-based nanoelectronic devices.

Published
2009
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38. Theory of nanocluster size distributions from ion beam synthesis.

Author

Yuan CW, Yi DO, Sharp ID, Shin SJ, Liao CY, Guzman J, Ager JW 3rd, Haller EE, and Chrzan DC

Abstract

Ion beam synthesis of nanoclusters is studied via both kinetic Monte Carlo simulations and the self-consistent mean-field solution to a set of coupled rate equations. Both approaches predict the existence of a steady-state shape for the cluster-size distribution that depends only on a characteristic length determined by the effective diffusion coefficient, the ion solubility, and the volumetric ion flux. The average cluster size in the steady-state regime is determined by the implanted species or matrix interface energy.

Published
2009
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39. Optical detection and ionization of donors in specific electronic and nuclear spin States.

Author

Yang A, Steger M, Karaiskaj D, Thewalt ML, Cardona M, Itoh KM, Riemann H, Abrosimov NV, Churbanov MF, Gusev AV, Bulanov AD, Kaliteevskii AK, Godisov ON, Becker P, Pohl HJ, Ager JW 3rd, and Haller EE

Abstract

We resolve the remarkably sharp bound exciton transitions of highly enriched 28Si using a single-frequency laser and photoluminescence excitation spectroscopy, as well as photocurrent spectroscopy. Well-resolved doublets in the spectrum of the 31P donor reflect the hyperfine coupling of the electronic and nuclear donor spins. The optical detection of the nuclear spin state, and selective pumping and ionization of donors in specific electronic and nuclear spin states, suggests a number of new possibilities which could be useful for the realization of silicon-based quantum computers.

Published
2006
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40. Large melting-point hysteresis of Ge nanocrystals embedded in SiO2.

Author

Xu Q, Sharp ID, Yuan CW, Yi DO, Liao CY, Glaeser AM, Minor AM, Beeman JW, Ridgway MC, Kluth P, Ager JW 3rd, Chrzan DC, and Haller EE

Abstract

The melting behavior of Ge nanocrystals embedded within SiO2 is evaluated using in situ transmission electron microscopy. The observed melting-point hysteresis is large (+/-17%) and nearly symmetric about the bulk melting point. This hysteresis is modeled successfully using classical nucleation theory without the need to invoke epitaxy.

Published
2006
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41. Control of defect concentrations within a semiconductor through adsorption.

Author

Seebauer EG, Dev K, Jung MY, Vaidyanathan R, Kwok CT, Ager JW, Haller EE, and Braatz RD

Abstract

The technologically useful properties of a crystalline solid depend upon the concentration of defects it contains. Here we show that defect concentrations as deep as 0.5 microm within a semiconductor can be profoundly influenced by gas adsorption. Self-diffusion rates within silicon show that nitrogen atoms adsorbed at less than 1% of a monolayer lead to defect concentrations that vary controllably over several orders of magnitude. The results show that previous measurements of diffusion and defect thermodynamics in semiconductors may have suffered from neglect of adsorption effects.

Published
2006
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42. Evidence for p-type doping of InN.

Author

Jones RE, Yu KM, Li SX, Walukiewicz W, Ager JW, Haller EE, Lu H, and Schaff WJ

Abstract

The first evidence of successful p-type doping of InN is presented. It is shown that InN:Mg films consist of a p-type bulk region with a thin n-type inversion layer at the surface that prevents electrical contact to the bulk. Capacitance-voltage measurements indicate a net concentration of ionized acceptors below the -type surface. Irradiation with 2 MeV He+ ions is used to convert the bulk of InN:Mg from p to n-type, at which point photoluminescence is recovered. The conversion is well explained by a model assuming two parallel conducting layers (the surface and the bulk) in the films.

Published
2006
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43. New limit on the neutrinoless betabeta decay of 130Te.

Author

Arnaboldi C, Artusa DR, Avignone FT 3rd, Balata M, Bandac I, Barucci M, Beeman JW, Brofferio C, Bucci C, Capelli S, Carbone L, Cebrian S, Cremonesi O, Creswick RJ, de Waard A, Farach HA, Fiorini E, Frossati G, Guardincerri E, Giuliani A, Gorla P, Haller EE, McDonald RJ, Morales A, Norman EB, Nucciotti A, Olivieri E, Pallavicini M, Palmieri E, Pasca E, Pavan M, Pedretti M, Pessina G, Pirro S, Previtali E, Risegari L, Rosenfeld C, Sangiorgio S, Sisti M, Smith AR, Torres L, and Ventura G

Abstract

We report the present results of CUORICINO, a search for neutrinoless double-beta (0nu betabeta) decay of 130Te. The detector is an array of 62 TeO2 bolometers with a total active mass of 40.7 kg. The array is cooled by a dilution refrigerator shielded from environmental radioactivity and energetic neutrons, operated at approximately 8 mK in the Gran Sasso Underground Laboratory. No evidence for (0nu betabeta) decay was found and a new lower limit, T(1/2)(0nu) > or = 1.8 x 10(24) yr (90% C.L.) is set, corresponding to [m(nu)] < or = 0.2 to 1.1 eV, depending on the theoretical nuclear matrix elements used in the analysis.

Published
2005
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44. Compositional modulation in In(x)Ga(1-x)N: TEM and X-ray studies.

Author

Liliental-Weber Z, Zakharov DN, Yu KM, Ager JW 3rd, Walukiewicz W, Haller EE, Lu H, and Schaff WJ

Abstract

Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD) have been used to study compositional modulation in In(x)Ga(1-x) N layers grown with compositions close to miscibility gap. The samples (0.34 < x < 0.8) were deposited by molecular beam epitaxy using either a 200 nm thick AlN or GaN buffer layer grown on a sapphire substrate. Periodic compositional modulation leads to extra electron diffraction spots and satellite reflections in XRD in the theta-2theta coupled geometry. The ordering period delta measured along c-axis was about delta = 45 A for x = 0.5 and delta = 66 A for x = 0.78 for samples grown on AlN buffer layer. TEM and XRD determinations of delta were in good agreement. Compositional modulation was not observed for the sample with x = 0.34 grown on a GaN buffer layer. Larger values of delta were observed for layers with higher In content and for those having larger mismatch with the underlying AlN buffer layer. The possibility that the roughness of the AlN growth surface promotes strong In segregation on particular crystallographic planes leading to compositional modulation is considered.

Published
2005
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45. Radiation enhanced silicon self-diffusion and the silicon vacancy at high temperatures.

Author

Bracht H, Pedersen JF, Zangenberg N, Larsen AN, Haller EE, Lulli G, and Posselt M

Abstract

We report proton radiation enhanced self-diffusion (RESD) studies on Si-isotope heterostructures. Self-diffusion experiments under irradiation were performed at temperatures between 780 degrees C and 872 degrees C for various times and proton fluxes. Detailed modeling of RESD provides direct evidence that vacancies at high temperatures diffuse with a migration enthalpy of H(m)(V)=(1.8+/-0.5) eV significantly more slowly than expected from their diffusion at low temperatures, which is described by H(m)(V)<0.5 eV. We conclude that this diffusion behavior is a consequence of the microscopic configuration of the vacancy whose entropy and enthalpy of migration increase with increasing temperature.

Published
2003
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46. Analysis of broadband x-ray spectra of highly charged krypton from a microcalorimeter detector of an electron-beam ion trap.

Author

Kink I, Laming JM, Takács E, Porto JV, Gillaspy JD, Silver E, Schnopper H, Bandler SR, Barbera M, Brickhouse N, Murray S, Madden N, Landis D, Beeman J, and Haller EE

Abstract

Spectra of highly charged Kr ions, produced in an electron-beam ion trap (EBIT), have been recorded in a broad x-ray energy band (0.3 keV to 4 keV) with a microcalorimeter detector. Most of the spectral lines have been identified as transitions of B- to Al-like Kr. The transition energies have been determined with 0.2% uncertainty. A semi-empirical EBIT plasma model has been created to calculate a synthetic spectrum of highly charged Kr and to determine a charge state distribution of Kr ions inside the EBIT.

Published
2001
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48. Large disparity between gallium and antimony self-diffusion in gallium antimonide.

Author

Bracht H, Nicols SP, Walukiewicz W, Silveira JP, Briones F, and Haller EE

Abstract

The most fundamental mass transport process in solids is self-diffusion. The motion of host-lattice ('self-') atoms in solids is mediated by point defects such as vacancies or interstitial atoms, whose formation and migration enthalpies determine the kinetics of this thermally activated process. Self-diffusion studies also contribute to the understanding of the diffusion of impurities, and a quantitative understanding of self- and foreign-atom diffusion in semiconductors is central to the development of advanced electronic devices. In the past few years, self-diffusion studies have been performed successfully with isotopically controlled semiconductor heterostructures of germanium, silicon, gallium arsenide and gallium phosphide. Self-diffusion studies with isotopically controlled GaAs and GaP have been restricted to Ga self-diffusion, as only Ga has two stable isotopes, 69Ga and 71Ga. Here we report self-diffusion studies with an isotopically controlled multilayer structure of crystalline GaSb. Two stable isotopes exist for both Ga and Sb, allowing the simultaneous study of diffusion on both sublattices. Our experiments show that near the melting temperature, Ga diffuses more rapidly than Sb by over three orders of magnitude. This surprisingly large difference in atomic mobility requires a physical explanation going beyond standard diffusion models. Combining our data for Ga and Sb diffusion with related results for foreign-atom diffusion in GaSb (refs 8, 9), we conclude that the unusually slow Sb diffusion in GaSb is a consequence of reactions between defects on the Ga and Sb sublattices, which suppress the defects that are required for Sb diffusion.

Published
2000
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49. Interaction of localized electronic states with the conduction band: band anticrossing in II-VI semiconductor ternaries

Author

Walukiewicz W, Shan W, Yu KM, Ager JW 3rd, Haller EE, Miotkowski I I, Seong MJ, Alawadhi H, and Ramdas AK

Abstract

We report a strongly nonlinear pressure dependence of the band gaps and large downward shifts of the conduction band edges as functions of composition in ZnS xTe (1-x) and ZnSe (y)Te (1-y) alloys. The dependencies are explained by an interaction between localized A1 symmetry states of S or Se atoms and the extended states of the ZnTe matrix. These results, combined with previous studies of III-N-V materials define a new, broad class of semiconductor alloys in which the introduction of highly electronegative atoms leads to dramatic modifications of the conduction band structure. The modifications are well described by the recently introduced band anticrossing model.

Published
2000
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50. Exclusion limits on the WIMP-nucleon cross section from the cryogenic dark matter search.

Author

Abusaidi R, Akerib DS, Barnes PD Jr, Bauer DA, Bolozdynya A, Brink PL, Bunker R, Cabrera B, Caldwell DO, Castle JP, Clarke RM, Colling P, Crisler MB, Cummings A, Da Silva A, Davies AK, Dixon R, Dougherty BL, Driscoll D, Eichblatt S, Emes J, Gaitskell RJ, Golwala SR, Hale D, Haller EE, Hellmig J, Huber ME, Irwin KD, Jochum J, Lipschultz FP, Lu A, Mandic V, Martinis JM, Nam SW, Nelson H, Neuhauser B, Penn MJ, Perera TA, Perillo Isaac MC, Pritychenko B, Ross RR, Saab T, Sadoulet B, Schnee RW, Seitz DN, Shestople P, Shutt T, Smith A, Smith GW, Sonnenschein AH, Spadafora AL, Stockwell W, Taylor JD, White S, Yellin S, and Young BA

Abstract

The Cryogenic Dark Matter Search (CDMS) employs Ge and Si detectors to search for weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei while discriminating against interactions of background particles. CDMS data, accounting for the neutron background, give limits on the spin-independent WIMP-nucleon elastic-scattering cross section that exclude unexplored parameter space above 10 GeV/c2 WIMP mass and, at >75% C.L., the entire 3sigma allowed region for the WIMP signal reported by the DAMA experiment.

Published
2000
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