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4 results on '"F. Semeria"'

1. Monte Carlo Simulation of the Hedgehog Defect Core in Spin Systems

Author

Claudio Zannoni, Cesare Chiccoli, Paolo Pasini, F. Semeria, and T.J. Sluckin

Subjects
Physics, Physics and Astronomy (miscellaneous), Condensed matter physics, Quantitative Biology::Tissues and Organs, Monte Carlo method, General Engineering, Context (language use), Disclination, Atomic and Molecular Physics, and Optics, Condensed Matter::Soft Condensed Matter, Core (optical fiber), Liquid crystal, Magnet, Circular symmetry, Statistical physics, Spin-½
Abstract

The core structures of hedgehog point disclinations in Heisenberg magnets and Lebwohl-Lasher nematic liquid crystals have been investigated by Monte Carlo simulation. We find qualitative agreement with the theoretical predictions of Schopohl and Sluckin that the magnetic defects have smaller cores. We also find some evidence for the picture of Penzen- stadler and Trebin in which spherical symmetry of the nematic hedgehog core is broken, and the core region can be considered as a disclination line of index l/2. Finally we make some general comments about the significance of our results in the context of other recent theoretical speculations.

Published
1995
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2. The XENONnT dark matter experiment.

Author

Aprile E, Aalbers J, Abe K, Ahmed Maouloud S, Althueser L, Andrieu B, Angelino E, Angevaare JR, Antochi VC, Antón Martin D, Arneodo F, Balata M, Baudis L, Baxter AL, Bazyk M, Bellagamba L, Biondi R, Bismark A, Brookes EJ, Brown A, Bruenner S, Bruno G, Budnik R, Bui TK, Cai C, Cardoso JMR, Cassese F, Chiarini A, Cichon D, Cimental Chavez AP, Colijn AP, Conrad J, Corrieri R, Cuenca-García JJ, Cussonneau JP, Dadoun O, D'Andrea V, Decowski MP, De Fazio B, Gangi PD, Diglio S, Disdier JM, Douillet D, Eitel K, Elykov A, Farrell S, Ferella AD, Ferrari C, Fischer H, Flierman M, Form S, Front D, Fulgione W, Fuselli C, Gaemers P, Gaior R, Rosso AG, Galloway M, Gao F, Gardner R, Garroum N, Glade-Beucke R, Grandi L, Grigat J, Guan H, Guerzoni M, Guida M, Hammann R, Higuera A, Hils C, Hoetzsch L, Hood NF, Howlett J, Huhmann C, Iacovacci M, Iaquaniello G, Iven L, Itow Y, Jakob J, Joerg F, Joy A, Kara M, Kavrigin P, Kazama S, Kobayashi M, Koltman G, Kopec A, Kuger F, Landsman H, Lang RF, Levinson L, Li I, Li S, Liang S, Lindemann S, Lindner M, Liu K, Loizeau J, Lombardi F, Long J, Lopes JAM, Ma Y, Macolino C, Mahlstedt J, Mancuso A, Manenti L, Marignetti F, Marrodán Undagoitia T, Martella P, Martens K, Masbou J, Masson D, Masson E, Mastroianni S, Mele E, Messina M, Michinelli R, Miuchi K, Molinario A, Moriyama S, Morå K, Mosbacher Y, Murra M, Müller J, Ni K, Nisi S, Oberlack U, Orlandi D, Othegraven R, Paetsch B, Palacio J, Parlati S, Paschos P, Pellegrini Q, Peres R, Peters C, Pienaar J, Pierre M, Plante G, Pollmann TR, Qi J, Qin J, García DR, Rynge M, Shi J, Singh R, Sanchez L, Santos JMFD, Sarnoff I, Sartorelli G, Schreiner J, Schulte D, Schulte P, Schulze Eißing H, Schumann M, Scotto Lavina L, Selvi M, Semeria F, Shagin P, Shi S, Shockley E, Silva M, Simgen H, Stephen J, Stern M, Stillwell BK, Takeda A, Tan PL, Tatananni D, Terliuk A, Thers D, Toschi F, Trinchero G, Tunnell C, Tönnies F, Valerius K, Volta G, Weinheimer C, Weiss M, Wenz D, Westermann J, Wittweg C, Wolf T, Wu VHS, Xing Y, Xu D, Xu Z, Yamashita M, Yang L, Ye J, Yuan L, Zavattini G, Zhong M, and Zhu T

Abstract

The multi-staged XENON program at INFN Laboratori Nazionali del Gran Sasso aims to detect dark matter with two-phase liquid xenon time projection chambers of increasing size and sensitivity. The XENONnT experiment is the latest detector in the program, planned to be an upgrade of its predecessor XENON1T. It features an active target of 5.9 tonnes of cryogenic liquid xenon (8.5 tonnes total mass in cryostat). The experiment is expected to extend the sensitivity to WIMP dark matter by more than an order of magnitude compared to XENON1T, thanks to the larger active mass and the significantly reduced background, improved by novel systems such as a radon removal plant and a neutron veto. This article describes the XENONnT experiment and its sub-systems in detail and reports on the detector performance during the first science run., (© The Author(s) 2024.)

Published
2024
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3. Material radiopurity control in the XENONnT experiment.

Author

Aprile E, Abe K, Agostini F, Ahmed Maouloud S, Alfonsi M, Althueser L, Angelino E, Angevaare JR, Antochi VC, Antón Martin D, Arneodo F, Baudis L, Baxter AL, Bellagamba L, Biondi R, Bismark A, Brown A, Bruenner S, Bruno G, Budnik R, Capelli C, Cardoso JMR, Cichon D, Cimmino B, Clark M, Colijn AP, Conrad J, Cuenca-García JJ, Cussonneau JP, D'Andrea V, Decowski MP, Gangi PD, Pede SD, Giovanni AD, Stefano RD, Diglio S, Elykov A, Farrell S, Ferella AD, Fischer H, Fulgione W, Gaemers P, Gaior R, Galloway M, Gao F, Glade-Beucke R, Grandi L, Grigat J, Higuera A, Hils C, Hiraide K, Hoetzsch L, Howlett J, Iacovacci M, Itow Y, Jakob J, Joerg F, Kato N, Kavrigin P, Kazama S, Kobayashi M, Koltman G, Kopec A, Landsman H, Lang RF, Levinson L, Li I, Liang S, Lindemann S, Lindner M, Liu K, Lombardi F, Long J, Lopes JAM, Ma Y, Macolino C, Mahlstedt J, Mancuso A, Manenti L, Manfredini A, Marignetti F, Marrodán Undagoitia T, Martens K, Masbou J, Masson D, Masson E, Mastroianni S, Messina M, Miuchi K, Mizukoshi K, Molinario A, Moriyama S, Morå K, Mosbacher Y, Murra M, Ni K, Oberlack U, Palacio J, Peres R, Pienaar J, Pierre M, Pizzella V, Plante G, Qi J, Qin J, Ramírez García D, Reichard S, Rocchetti A, Rupp N, Sanchez L, Dos Santos JMF, Sartorelli G, Schreiner J, Schulte D, Schulze Eißing H, Schumann M, Lavina LS, Selvi M, Semeria F, Shagin P, Shockley E, Silva M, Simgen H, Takeda A, Tan PL, Terliuk A, Therreau C, Thers D, Toschi F, Trinchero G, Tunnell C, Tönnies F, Valerius K, Volta G, Wei Y, Weinheimer C, Weiss M, Wenz D, Westermann J, Wittweg C, Wolf T, Xu Z, Yamashita M, Yang L, Ye J, Yuan L, Zavattini G, Zhang Y, Zhong M, Zhu T, Zopounidis JP, Laubenstein M, and Nisi S

Abstract

The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and 222 Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background ( ∼ 17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected 222 Rn activity concentration in XENONnT is determined to be 4.2 ( - 0.7 + 0.5 )  μ Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system., (© The Author(s) 2022.)

Published
2022
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4. 222 Rn  emanation measurements for the XENON1T experiment.

Author

Aprile E, Aalbers J, Agostini F, Alfonsi M, Althueser L, Amaro FD, Antochi VC, Angelino E, Angevaare JR, Arneodo F, Barge D, Baudis L, Bauermeister B, Bellagamba L, Benabderrahmane ML, Berger T, Breur PA, Brown A, Brown E, Bruenner S, Bruno G, Budnik R, Capelli C, Cardoso JMR, Cichon D, Cimmino B, Clark M, Coderre D, Colijn AP, Conrad J, Cussonneau JP, Decowski MP, Depoian A, Di Gangi P, Di Giovanni A, Di Stefano R, Diglio S, Elykov A, Eurin G, Ferella AD, Fulgione W, Gaemers P, Gaior R, Rosso AG, Galloway M, Gao F, Grandi L, Garbini M, Hasterok C, Hils C, Hiraide K, Hoetzsch L, Hogenbirk E, Howlett J, Iacovacci M, Itow Y, Joerg F, Kato N, Kazama S, Kobayashi M, Koltman G, Kopec A, Landsman H, Lang RF, Levinson L, Lin Q, Lindemann S, Lindner M, Lombardi F, Lopes JAM, López Fune E, Macolino C, Mahlstedt J, Manenti L, Manfredini A, Marignetti F, Undagoitia TM, Martens K, Masbou J, Masson D, Mastroianni S, Messina M, Miuchi K, Molinario A, Morå K, Moriyama S, Mosbacher Y, Murra M, Naganoma J, Ni K, Oberlack U, Odgers K, Palacio J, Pelssers B, Peres R, Pienaar J, Pizzella V, Plante G, Qin J, Qiu H, García DR, Reichard S, Rocchetti A, Rupp N, Santos JMFD, Sartorelli G, Šarčević N, Scheibelhut M, Schindler S, Schreiner J, Schulte D, Schumann M, Lavina LS, Selvi M, Semeria F, Shagin P, Shockley E, Silva M, Simgen H, Takeda A, Therreau C, Thers D, Toschi F, Trinchero G, Tunnell C, Vargas M, Volta G, Wack O, Wang H, Wei Y, Weinheimer C, Weiss M, Wenz D, Westermann J, Wittweg C, Wulf J, Xu Z, Yamashita M, Ye J, Zavattini G, Zhang Y, Zhu T, and Zopounidis JP

Abstract

The selection of low-radioactive construction materials is of utmost importance for the success of low-energy rare event search experiments. Besides radioactive contaminants in the bulk, the emanation of radioactive radon atoms from material surfaces attains increasing relevance in the effort to further reduce the background of such experiments. In this work, we present the 222 Rn emanation measurements performed for the XENON1T dark matter experiment. Together with the bulk impurity screening campaign, the results enabled us to select the radio-purest construction materials, targeting a 222 Rn activity concentration of 10 μ Bq / kg in 3.2 t of xenon. The knowledge of the distribution of the 222 Rn sources allowed us to selectively eliminate problematic components in the course of the experiment. The predictions from the emanation measurements were compared to data of the 222 Rn activity concentration in XENON1T. The final 222 Rn activity concentration of ( 4.5 ± 0.1 ) μ Bq / kg in the target of XENON1T is the lowest ever achieved in a xenon dark matter experiment., (© The Author(s) 2021.)

Published
2021
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