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1. High-order angular correlation of californium-252 fission neutrons and the effect of detector cross-talk

Author

Olivier Litaize, Ramona Vogt, Stephen Croft, Rashed Sarwar, Vytautas Astromskas, Abdelhazize Chebboubi, Colin Zimmerman, Malcolm J. Joyce, Lancaster University, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Oak Ridge National Laboratory [Oak Ridge] (ORNL), UT-Battelle, LLC, University of California, Inland Norway University of Applied Sciences - Høgskolen i Innlandet, University of California (UC), CEA-Direction de l'Energie Nucléaire (CEA-DEN), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Detector, Liquid scintillation counting, chemistry.chemical_element, Californium, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neutron temperature, Nuclear physics, chemistry, 0103 physical sciences, Neutron, 010306 general physics, Instrumentation, Spontaneous fission
Abstract

High-order angular correlations of fast neutrons emitted by spontaneous fission in californium-252 ( 252 Cf) have been measured with a 2D array of 15 EJ-309 organic liquid scintillation detectors. These are compared with the results of Geant4 simulations using both an uncorrelated, average fission model and correlated fission models, which have also been used to quantify the impact of detector cross-talk on these distributions. In general, a bipolar trend is observed up to and including quadruple events, that is, θ 12 , θ 13 and θ 14 . A bias as θ → 0 ∘ in these data is observed that is consistent with the expectation of cross-talk being more prevalent for nearest-neighbour detectors. This is observed to be reduced for higher orders ( θ 13 and θ 14 relative to θ 12 ) and for wider gate widths (25 ns rather than 10 ns), consistent with this phenomenon being cross-talk. For the case of θ 13 , each of the composite angular distributions for the 14 detector positions 2 4 ∘ ≤ θ ≤ 33 6 ∘ have also been derived: a variation from a bipolar trend to a more isotropic behaviour, accompanied by a reduction in the relative level of response, is observed in these data for detector angles orthogonal to the reference detector at 0 ∘ consistent with the majority of neutrons being emitted from accelerated fragments. This research constitutes an important step towards quantifying and managing cross-talk as arrays of organic scintillators attract interest for practical applications such as nuclear materials assay.

Published
2020
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2. The liquid handling systems for the Borexino solar neutrino detector

Author

A. de Bellefon, R. von Hentig, S. Kidner, S. Parmeggiano, J. Maneira, A. Nelson, Danilo Giugni, W. Hampel, R. Eisenstein, G. Cecchet, A. Bevilacqua, Gunther Korschinek, T. A. Shutt, R. Fernholz, Mikael Hult, Elisa Resconi, An. Ianni, S. Gazzana, C. Arpesella, S. Hardy, R. Tartaglia, M. Parodi, Cristiano Galbiati, F. Soricelli, P. Risso, S. Vitale, A. E. Chavarria, K. McCarty, Nicomede Pelliccia, R. Cereseto, L. Perasso, E. Harding, C. Sule, Y. Suvorov, K. Jaenner, P. Saggese, Aldo Ianni, T. Lewke, A. Sotnikov, D. Kryn, Bryant Williams, C. Salvo, W. Maneschg, T. Goldbrunner, K. H. Schubeck, V. Vyrodov, Stefano Nisi, M. Goeger-Neff, M. Balata, G. Testera, Paolo Lombardi, F. Loeser, Margherita Buizza Avanzini, Laura Cadonati, L. Papp, M. Obolensky, Jay Burton Benziger, H. de Kerret, Y. Kozlov, A. M. Goretti, A.V. Etenko, C. Grieb, G. Heusser, M. Marchelli, G. Di Pietro, Lino Miramonti, Stefano Bonetti, D. Franco, M. D. Skorokhvatov, D. Bartolomei, A. Razeto, D. Manuzio, I. N. Machulin, D. Bondi, E. de Haas, A. Golubchikov, Fausto Ortica, Michael Wurm, R. Wordel, E. Litvinovich, M. Chen, V. G. Tarasenkov, R. Saldanha, Fausto Masetti, F. Siccardi, F. Dalnoki-Veress, Gioacchino Ranucci, Lothar Oberauer, R. Parsells, S. V. Sukhotin, Matthias Laubenstein, Marco Pallavicini, D. D'Angelo, O. Zaimidoroga, R. J. Ford, Frank Calaprice, T. Hagner, Marco Giammarchi, Martin Deutsch, S. Davini, F. Hartmann, Hardy Simgen, V. M. Gehman, V. V. Kobychev, Livia Ludhova, F. von Feilitzsch, Malcolm J. Joyce, Till Kirsten, A. S. Chepurnov, H.O. Back, C. Carraro, G. Bellini, Sandra Malvezzi, T. Hertrich, M. Orsini, E. Meroni, B. Loer, C. Hagner, D. Rountree, W. Czech, Gianluca Alimonti, Flavio Gatti, N. Gaertner, Ugo Mazzucato, L. Ioannucci, A. V. Derbin, Daniel McKinsey, A. Manco, A. Marternianov, Augusto Brigatti, R. B. Vogelaar, H. Neder, S. Schönert, W. Rau, Q. Meindl, L. Niedermeier, I. Manno, D. Vignaud, C. Lendvai, E. Guardincerri, G. Zuzel, Sandra Zavatarelli, G. Korga, K. Fomenko, Michael K.H. Leung, B. Freudiger, A. Di Credico, M. Misiaszek, P.H. La Marche, R. Scardaoni, B. Caccianiga, D. Schimizzi, D. Montanari, A. de Bari, A. A. Sabelnikov, V. N. Muratova, Fausto Elisei, S. Perasso, V. Lagomarsino, Aldo Romani, Paolo Musico, Marcin Wójcik, A. Cubaiu, J. Kiko, M. E. Monzani, A. Pocar, O. Smirnov, Andrew Sonnenschein, A. Di Ludovico, R. S. Raghavan, G. Manuzio, AstroParticule et Cosmologie (APC (UMR_7164)), 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Borexino, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Alimonti, G., Suvorov, Y., and Et, Al.

Subjects
Nuclear and High Energy Physics, Low background detector, Liquid scintillator, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Physics::Instrumentation and Detectors, Solar neutrino, Nuclear engineering, Radiopurity, Scintillator, 01 natural sciences, Nuclear physics, Physics::Fluid Dynamics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Borexino, Nuclear and High Energy Physic, Physics, 010308 nuclear & particles physics, Modular system, Detector, Volumetric flow rate, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Flow control (fluid), Neutrino detector, High Energy Physics::Experiment
Abstract

The successful deployment of the Borexino solar neutrino detector required assorted physical and chemical operations to produce exceptional pure fluids and fill multiple detector zones. The composition and flow rates of high purity gases and liquids had to be precisely controlled to maintain liquid levels and pressures. The system was required to meet exceptional requirements for cleanliness and leak-tightness. A large scale modular system connecting fluid receiving, purification and fluid delivery processes was developed for Borexino. At the core is a flow control system that delivers scintillator components to plants for purification, and then fills the Borexino detector volumes with ultrahigh purity buffer or ultrahigh purity scintillator. The liquid handling system maintains precise control over the liquid levels and differential pressures between the different volumes of the detectors that are separated by flexible nylon vessels. The preparation, commissioning and operation of the system for filling the Borexino detector with scintillator is described.

Published
2009
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3. The Borexino detector at the Laboratori Nazionali del Gran Sasso

Author

V. Vyrodov, D. Bondi, Malcolm J. Joyce, Laura Cadonati, T. Goldbrunner, T. Hertich, E. de Haas, O. Smirnov, F. von Feiltitsch, M. Misiaszek, W. Czech, Matthias Laubenstein, A. de Bellefon, A. Martemiano, W. Maneschg, Stefano Nisi, M. Marchelli, M. Parodi, Stefano Bonetti, D. Manuzio, Marco Pallavicini, V. M. Gehman, A. Alimonti, Augusto Brigatti, D. Bartolomei, Fausto Ortica, D. D'Angelo, Michael Wurm, Andrew Sonnenschein, I. Machulin, A. Bevilacqua, E. Litvinovich, P. Musico, G. Di Pietro, G. Testera, K. McCarty, R. von Hentig, A. Cubauu, M. Orsini, Sandra Malvezzi, M. E. Monzani, J. Benziger, P. Saggese, J. Kiko, Q. Meindl, S. Parmeggiano, D. Rountree, J. Maneira, A. Di Credico, B. William, Daniel McKinsey, A. Manco, V. Muratova, B. Caccianiga, P.H. La Marche, R. Scardaoni, Aldo Romani, F. Calaprice, L. Papp, B. Freudiger, Ugo Mazzucato, F. Soricelli, D. Vignaud, G. Ceccet, L. Niedermeier, Michael K.H. Leung, A. Pocar, H. Neder, S. Hardy, M. Goeger-Neff, T. A. Shutt, R. Fernholz, G. Manuzio, K. H. Schubeck, Till Kirsten, I. Manno, Cristiano Galbiati, C. Sule, Mikael Hult, A. Nelson, D. Loeser, Danilo Giugni, R. Ceresto, Hardy Simgen, D. Schimizzi, D. Franco, F. Dalnoki-Veress, R. Eisenstein, S. Gazzana, A. Chen, K. Fomenko, V. Lagomarsino, A. de Bari, D. Kryne, C. Carraro, K. Jaenner, S. Vital, R. Tartaglia, E. Harding, D. Montanari, M. Skorokhvatov, G. Bellini, A. A. Sabelnikov, C. Arpesella, R. B. Vogelaar, R. Wordel, S. Schönert, Lino Miramonti, A. Golubchikov, S. Kidner, T. Lewke, C. Lendvai, Martin Deutsch, G. Heusser, A. Derbin, Marcin Wójcik, C. Grieb, Elisa Resconi, E. Meroni, Andrea Ianni, Sandra Zavatarelli, Gioacchino Ranucci, R. S. Raghavan, H.O. Back, Fausto Elisei, G. Korga, R. Saldhana, Y. Suvorov, L. Oberauer, A. Sotnikov, G. Korschnik, M. Gärtner, A. E. Chavarria, L. Perasso, S. V. Sukhotin, V. V. Kobychev, M. Obolensky, H. de Kerret, G. Zuzel, Y. Kozlov, Fausto Masetti, Paolo Lombardi, A.V. Etenko, A. Goretti, Livia Ludhova, W. Hampel, A. S. Chepurnov, M. Balata, F. Siccardi, C. Salvo, B. Loer, C. Hagner, W. Rau, O. Zaimidoroga, P. Risso, F. Gattig, V. G. Tarasenkov, F. Hartmann, Nicomede Pelliccia, A. Razeto, A. Di Ldovico, R. J. Ford, Marco Giammarchi, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Borexino, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Alimonti, G., Suvorov, Y., Et, Al., 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris

Subjects
Low background detector, Nuclear and High Energy Physics, Photomultiplier, Particle physics, Liquid scintillator, Physics - Instrumentation and Detectors, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Physics::Instrumentation and Detectors, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Solar neutrino, FOS: Physical sciences, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], High Energy Physics - Experiment (hep-ex), Low background detectors, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Borexino, Nuclear and High Energy Physic, Physics, ICARUS, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), Liquid scintillators, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], High Energy Physics::Experiment, Neutrino, Large Volume Detector
Abstract

Borexino, a large volume detector for low energy neutrino spectroscopy, is currently running underground at the Laboratori Nazionali del Gran Sasso, Italy. The main goal of the experiment is the real-time measurement of sub MeV solar neutrinos, and particularly of the mono energetic (862 keV) Be7 electron capture neutrinos, via neutrino-electron scattering in an ultra-pure liquid scintillator. This paper is mostly devoted to the description of the detector structure, the photomultipliers, the electronics, and the trigger and calibration systems. The real performance of the detector, which always meets, and sometimes exceeds, design expectations, is also shown. Some important aspects of the Borexino project, i.e. the fluid handling plants, the purification techniques and the filling procedures, are not covered in this paper and are, or will be, published elsewhere (see Introduction and Bibliography)., Comment: 37 pages, 43 figures, to be submitted to NIM

Published
2009
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4. Scintillator purification, detector performance and first results from Borexino

Author

Andrea Ianni, Sandra Zavatarelli, L. Papp, L. Niedermeier, Michael K.H. Leung, B. Caccianiga, D. Vignaud, S. V. Sukhotin, O. Zaimidoroga, R. Tartaglia, R. B. Vogelaar, A. Sotnikov, E. Meroni, S. Vitale, A.V. Etenko, Jay Burton Benziger, S. Hardy, S. Gazzana, Paolo Lombardi, S. Bonetti, Fausto Ortica, A. A. Sabelnikov, M. D. Skorokhvatov, C. Galbiati, Lothar Oberauer, I. N. Machulin, D. D'Angelo, M. Obolensky, Livia Ludhova, H. de Kerret, A. Razeto, G. Bellini, R. S. Raghavan, G. Manuzio, S. Schönert, A. Sonnenschein, B. Freudiger, R. J. Ford, Y. Suvorov, Lino Miramonti, L. Perasso, Marco Giammarchi, C. Grieb, M. Goeger-Neff, C. Arpesella, V. G. Tarasenkov, Martin Deutsch, C. Salvo, E. Litvinovich, Fausto Masetti, D. Franco, F. Dalnoki-Veress, Marcin Wójcik, Frank Calaprice, G. Korga, K. Fomenko, Marco Pallavicini, Hardy Simgen, G. Testera, F. von Feilitzsch, D. Kryn, Aldo Ianni, K. McCarty, A. M. Goretti, M. E. Monzani, A. Pocar, O. Smirnov, D. Montanari, Malcolm J. Joyce, M. Misiaszek, A. Martemianov, V. N. Muratova, G. Heusser, Gioacchino Ranucci, A. V. Derbin, G. Zuzel, Matthias Laubenstein, APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Borexino, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Pallavicini, M., Bellini, G., Benziger, J., Bonetti, S., Caccianiga, B., Calaprice, F., Dalnoki-Veress, F., D'Angelo, D., de Kerret, H., Derbin, A., Etenko, A., Fomenko, K., Ford, R., Franco, D., Galbiati, C., Gazzana, S., Giammarchi, M., Goeger-Neff, M., Goretti, A., Grieb, C., Hardy, S., Heusser, G., Ianni, Aldo, Lanni, Andrea, Joyce, M., Korga, G., Kryn, D., Laubenstein, M., Leung, M., Litvinovich, E., Lombardi, P., Ludhova, L., Machulin, I., Manuzio, G., Masetti, F., Mccarty, K., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M. E., Muratova, V., Niedermeier, L., Oberauer, L., Obolensky, M., Ortica, F., Papp, L., Perasso, L., Pocar, A., Raghavan, R. S., Ranucci, G., Razeto, A., Sabelnikov, A., Salvo, C., Schoenert, S., Simgen, H., Smirnov, O., Skorokhvatov, M., Sonnenschein, A., Sotnikov, A., Sukhotin, S., Suvorov, Y., Tarasenkov, V., Tartaglia, R., Testera, G., Vignaud, D., Vogelaar, R. B., von Feilitzsch, F., Wojcik, M., Zaimidoroga, O., Zavatarelli, S., and Zuzel, G.

Subjects
Physics, History, 010308 nuclear & particles physics, Solar neutrino, Detector, Scintillator, 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Borexino
Abstract

International audience; The Borexino experiment has begun data taking in May 2007 after a long R&D work and preparation. The liquid scintillator purity exceeds even optimistic expectations, and the first detection of 7Be solar neutrinos has been possible after less than two months of data taking. This note shows briefly which are the main issues that were addressed in order to obtain such an extreme radiopurity, the detector performance and a few details concerning this first result.

Published
2008
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5. New results on solar neutrino fluxes from 192 days of Borexino data

Author

M. Chen, S. V. Sukhotin, O. Zaimidoroga, D. Vignaud, M. D. Skorokhvatov, Michael Wurm, A. Nelson, C. Carraro, A. Martemianov, A. V. Derbin, M. Balata, V. V. Kobychev, R. Eisenstein, D. Manuzio, Augusto Brigatti, A. Razeto, T. Goldbrunner, Andrew Sonnenschein, E. Litvinovich, Sandra Malvezzi, T. Hertrich, C. Arpesella, P. Risso, Q. Meindl, Frank Calaprice, B. Freudiger, Hardy Simgen, S. Vitale, Matthias Laubenstein, Till Kirsten, A. Di Credico, F. Dalnoki-Veress, J. Maneira, Marco Pallavicini, Lino Miramonti, Gunther Korschinek, T. A. Shutt, R. Fernholz, M. E. Monzani, J. Kiko, Paolo Lombardi, Danilo Giugni, G. Heusser, R. Tartaglia, R. S. Raghavan, Aldo Ianni, A. Pocar, Fausto Masetti, G. Manuzio, M. Obolensky, M. Goeger-Neff, H. de Kerret, Y. Suvorov, Andrea Ianni, R. von Hentig, D. Kryn, Sandra Zavatarelli, Cristiano Galbiati, D. Schimizzi, Gioacchino Ranucci, S. Parmeggiano, A. de Bari, T. Lewke, Livia Ludhova, W. Maneschg, A. M. Goretti, D. Franco, H.O. Back, M. Orsini, E. Meroni, M. M. Wojcik, R. Saldanha, F. von Feilitzsch, S. Manecki, G. Bellini, C. Grieb, K. McCarty, A. A. Sabelnikov, A. Sotnikov, F.X. Hartman, P. LaMarche, R. J. Ford, S. Gazzana, G. Di Pietro, Flavio Gatti, Jay Burton Benziger, Marco Giammarchi, G. Testera, D. Montanari, S. Bonetti, C. Lendvai, A. de Bellefon, I. Manno, G. Korga, K. Fomenko, Laura Cadonati, O. Smirnov, L. Papp, Lothar Oberauer, G. Zuzel, V. N. Muratova, Fausto Ortica, Elisa Resconi, Fausto Elisei, S. Hardy, G. Cecchet, S. Schönert, W Rau, E. Harding, Martin Deutsch, A. E. Chavarria, L. Perasso, D. Rountree, Ugo Mazzucato, I. N. Machulin, R. B. Vogelaar, H. Neder, A.V. Etenko, D. D'Angelo, C. Salvo, Daniel McKinsey, L. Niedermeier, Michael K.H. Leung, B. Caccianiga, V. Lagomarsino, Aldo Romani, Malcolm J. Joyce, Caren Hagner, M. Misiaszek, B. Loer, W. Hampel, Paolo Musico, T. von Hentig, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Borexino, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Galbiati, C., Arpesella, C., Back, H. O., Balata, M., Bellini, G., Benziger, J., Bonetti, S., Brigatti, A., Caccianiga, B., Cadonati, L., Calaprice, F., Carraro, C., Cecchet, G., Chavarria, A., Chen, M., Dalnoki-Veress, F., D'Angelo, D., de Bari, A., de Bellefon, A., de Kerret, H., Derbin, A., Deutsch, M., di Credico, A., di Pietro, G., Eisenstein, R., Elisei, F., Etenko, A., Fernholz, R., Fomenko, K., Ford, R., Franco, D., Freudiger, B., Gatti, F., Gazzana, S., Giammarchi, M., Giugni, D., Goeger-Neff, M., Goldbrunner, T., Goretti, A., Grieb, C., Hagner, C., Hampel, W., Harding, E., Hardy, S., Hartman, F. X., Hertrich, T., Heusser, G., Ianni, Aldo, Ianni, Andrea, Joyce, M., Kiko, J., Lonegren, Kirsten, Kobychev, V., Korga, G., Korschinek, G., Kryn, D., Lagomarsino, V., Lamarche, P., Laubenstein, M., Lendvai, C., Leung, M., Lewke, T., Litvinovich, E., Loer, B., Lombardi, P., Ludhova, L., Machulin, I., Malvezzi, S., Manecki, S., Maneira, J., Maneschg, W., Manno, I., Manuzio, D., Manuzio, G., Martemianova, A., Masetti, F., Mazzucato, U., Mccarty, K., Mckinsey, D., Meindl, Q., Meroni, E., Miramonti, L., Misiaszek, M., Montanari, D., Monzani, M. E., Muratova, V., Musico, P., Neder, H., Nelson, A., Niedermeier, L., Oberauer, L., Obolensky, M., Orsini, M., Ortica, F., Pallavicini, M., Papp, L., Parmeggiano, S., Perasso, L., Pocar, A., Raghavan, R. S., Ranucci, G., Rau, W., Razeto, A., Resconi, E., Risso, P., Romani, A., Rountree, D., Sabelnikov, A., Saldanha, R., Salvo, C., Schimizzi, D., Schoenert, S., Shutt, T., Simgen, H., Skorokhvatov, M., Smirnov, O., Sonnenschein, A., Sotnikov, A., Sukhotin, S., Suvorov, Y., Tartaglia, R., Testera, G., Vignaud, D., Vitale, S., Vogelaar, R. B., von Feilitzsch, F., von Hentig, R., von Hentig, T., Wojcik, M., Wurm, M., Zaimidoroga, O., Zavatarelli, S., Zuzel, G., 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
History, Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, 01 natural sciences, Education, Nuclear physics, SCINTILLATOR, 0103 physical sciences, OSCILLATIONS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Astrophysics::Solar and Stellar Astrophysics, 010306 general physics, Neutrino oscillation, DETECTOR, Borexino, Physics, 010308 nuclear & particles physics, Oscillation, Solar neutrino problem, Computer Science Applications, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, MATTER
Abstract

International audience; We report the direct measurement of the 7Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV 7Be neutrinos is 49±3stat±4syst counts/(day*100 ton). The hypothesis of no oscillation for 7Be solar neutrinos is inconsistent with our measurement at the 4σ C.L. Our result is the first direct measurement of the survival probability for solar νe in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of 7Be, pp, and CNO solar νe, and the limit on the effective neutrino magnetic moment using solar neutrinos

Published
2008
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6. Search for solar axions emitted in the M1-transition of 7Li* with Borexino CTF

Author

S. Gazzana, Malcolm J. Joyce, Matthias Laubenstein, M. Misiaszek, R. Tartaglia, E. Meroni, S. V. Sukhotin, R. S. Raghavan, G. Manuzio, M. D. Skorokhvatov, O. Zaimidoroga, S. Bonetti, V. V. Kobychev, Lothar Oberauer, Aldo Ianni, A. Sotnikov, V. N. Muratova, Livia Ludhova, D. Kryn, An. Ianni, A. A. Sabelnikov, Paolo Lombardi, A. M. Goretti, A. V. Derbin, C. Grieb, M. Obolensky, H. de Kerret, L. Perasso, E. Litvinovich, G. Zuzel, Gioacchino Ranucci, S. Schönert, C. Salvo, Sandra Zavatarelli, R. B. Vogelaar, L. Niedermeier, A. Razeto, A.V. Etenko, Michael K.H. Leung, Marco Giammarchi, B. Caccianiga, G. Testera, Marcin Wójcik, I. N. Machulin, O. Smirnov, M. E. Monzani, Marco Pallavicini, D. D'Angelo, G. Korga, K. Fomenko, F. von Feilitzsch, F. Masetti, S. Hardy, L. Papp, Y. Suvorov, Lino Miramonti, Cristiano Galbiati, Fausto Ortica, V. G. Tarasenkov, D. Montanari, D. Vignaud, M. Goeger-Neff, Frank Calaprice, D. Franco, F. Dalnoki-Veress, Hardy Simgen, Jay Burton Benziger, G. Bellini, K. McCarty, Dipartimento di Fisica Università and INFN Milano, Department of Chemical Engineering, Princeton University, Department of Physics, Princeton University, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Petersburg Nuclear Physics Institute (PNPI), Russian Research Center Kurchatov Institute, Joint Institute for Nuclear Research (JINR), Laboratori Nazionali del Gran Sasso/INFN (LNGS), Technische Universität München (TUM), Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Kiev Institute for Nuclear Research, Dipartimento di Fisica, Università di Genova e Sezione INFN, Università degli Studi di Perugia = University of Perugia (UNIPG), M. Smoluchowski Institute of Physics, Jagellonian University, Max-Planck-Institut für Kernphysik (MPIK), Bellini, G., Suvorov, Y., and Et, Al.

Subjects
Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Axion Dark Matter Experiment, Electron, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, 010306 general physics, Nucleon, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Axion, Engineering (miscellaneous), Borexino
Abstract

Results of background measurements with a prototype of the Borexino detector were used to search for 478 keV solar axions emitted in the M1-transitions of 7Li*. The Compton conversion of axion to a photon A+e→e+γ, axioelectric effect A+e+Z→e+Z, decay of axion in two photons A→2γ and Primakoff conversion on nuclei A+Z→γ+Z are considered. The upper limit on constants of interaction of axion with electrons, photons and nucleons – gAegAN≤(1.0–2.4)×10-10 at mA≤450 keV and gAγgAN≤5×10-9 GeV-1 at mA≤10 keV are obtained (90%c.l.). For heavy axions with the mass at 100

Published
2008
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7. Observation and lifetime of the first excited superdeformed band in $^{192}$Hg

Author

A. Korichi, M. Kaci, H. Sergolle, T. L. Khoo, R. M. Clark, Josette Duprat, E. S. Paul, H. Hübel, J. Simpson, M. Meyer, A. G. Smith, I. Ahmad, Y. Le Coz, R. Wadsworth, N. Redon, W. Korten, C. W. Beausang, G. Bastin, N. Poffé, Malcolm J. Joyce, M. G. Porquet, R. Duffait, F. Hannachi, F. Azaiez, J.F. Sharpey-Schafer, B. J. P. Gall, C. Schück, T. Lauritsen, C. Bourgeois, R. V. F. Janssens, I. Deloncle, R. G. Henry, M. P. Carpenter, N. Perrin, P. Willsau, Institut de Physique Nucléaire d'Orsay (IPNO), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Attenuation, Electronic structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, Quadrupole, medicine, Atomic physics, 010306 general physics, Nucleus, Excitation
Abstract

An excited superdeformed (SD) band has been observed in 192Hg with the UROGAM spectrometer. It is interpreted as a two quasi-neutron excitation in the 192Hg SD nucleus. Nuclear level lifetimeshave been measured using the Dopple-shift attenuation method. An average transition quadrupole moment of 19.5 ± 1.5 b has been obtained which is similar to the value measured in the yeast SD band. These results indicate that the deformation in the 192Hg SD nucleus is stable despite changes in the occupancy of high-N-orbitals.

Published
1995

8. Collective oblate dipole rotational bands in $^{198}$pb

Author

Malcolm J. Joyce, J.F. Sharpey-Schafer, R. M. Clark, D. M. Cullen, Witold Nazarewicz, P. H. Regan, N. Redon, E. S. Paul, P. J. Dagnall, A. Astier, I. Ali, Marco Meyer, R. Wadsworth, C. W. Beausang, Ramon Wyss, Padraic G. Fallon, Flores, Sylvie, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Moment of inertia, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Dipole, 0103 physical sciences, Neutron, Singlet state, Atomic physics, 010306 general physics, Spin (physics), Beam (structure), Excitation
Abstract

The nucleus 198 Pb was populated via the 186 W( 17 O, 5n) 198 Pb reaction at beam energies of 92 and 98 MeV. Five collective rotational cascades of ΔI = 1 transitions have been found. Four are highly regular, one much more irregular. The structures are incorporated into a level scheme which extends up to approximately spin 32ħ and an excitation energy of about 10 MeV. Angular correlation measurements confirm the dipole character of the interband transitions. Their M1 multipolarity is inferred, and from this supposition the experimental data are interpreted in terms of oblate high- K two quasiproton configurations coupled to aligned neutron excitations. This interpretation is extended to include other ΔI = 1 oblate structures observed in 194–201 Pb. It is shown that the pattern of observed moments of inertia can be understood in the simple unpaired picture involving neutron i 13 2 excitations. The identical bands observed are interpreted in terms of the normal-parity weakly-coupled singlet orbital.

Published
1993

9. First observation of collective dipole rotational bands in the neutron-deficient bismuth nuclei

Author

R M Clark, Alison Bruce, J.F. Sharpey-Schafer, Malcolm J. Joyce, R Wadsworth, E S Paul, P J Dagnall, F Azaiez, C W Beausang, P Fallon, A Korichi, P M Jones, Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Bismuth, Dipole, medicine.anatomical_structure, Atomic orbital, chemistry, 0103 physical sciences, medicine, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Magnetic dipole, Nucleus, Beam energy
Abstract

The nucleus 202Bi was populated via the 196Pt(11B,5n)202Bi reaction at a beam energy of 75 MeV. Three regular sequences of magnetic dipole transitions have been found. A comparison is made with the known Delta I=1 rotational bands seen in the neighbouring Pb nuclei. An interpretation in terms of collective oblate configurations involving high-K proton and alignable neutron orbitals is suggested.

Published
1993

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