ACTA

Development of a PbWO₄ Detector for Single-Shot Positron Annihilation Lifetime Spectroscopy at the GBAR Experiment

B.H. Kim^a, J.J. Choi^a, M. Chung^b, P. Cladé^c, P. Comini^d, P. Crivelli^e, P-P Crépin^c, O. Dalkarov^f, P. Debu^d, L. Dodd^g, A. Douillet^{c, h}, P. Froehlichⁱ, S. Guellati^c, J. Heinrich^c, P.A. Hervieux^j, L. Hilico^{c, h}, A. Husson^k, P. Indelicato^c, G. Janka^e, S. Jonsellⁱ, J.P. Karr^{c, h}, E.S. Kim^l, S.K. Kim^a, Y. Ko^m, T. Kosinskiⁿ, N. Kuroda^o, B. Latacz^d, H. Lee^a, J. Lee^m, A.M.M. Leite^d, E. Lim^l, L. Liszkay^d, T. Louvradoux^c, D. Lunney^k, K. Lévêque^j, G. Manfredi^j, B. Mansoulié^d, M. Matusiakⁿ, G. Mornacchi^p, V.V. Nesvizhevsky^q, F. Nez^c, S. Niang^d, R. Nishi^o, S. Nourbaksh^p, P. Lotrus^d, K.H. Park^a, N. Paul^c, P. Pérez^d, B. Radics^e, C. Regenfus^e, S. Reynaud^c, J.Y. Roussé^d, A. Rubbia^e, J. Rzadkiewiczⁿ, Y. Sacquin^d, F. Schmidt-Kaler^r, M. Staszczakⁿ, B. Tuchming^d, B. Vallage^d, D.P. van der Werf^g, A. Voronin^f, A. Welker^p, S. Wolf^r, D. Won^a, S. Wronkaⁿ, Y. Yamazaki^s, K.H. Yoo^b
^aDepartment of Physics and Astronomy, Seoul National University, 1 Gwanak-Ro, Gwanak-gu, Seoul 08826, Korea
^bDepartment of Physics, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea
^cLaboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France, Campus Pierre et Marie Curie, 4, pl. Jussieu, F-75005 Paris, France
^dIRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
^eInstitute for Particle Physics and Astrophysics, ETH Zurich, 8093 Zurich, Switzerland
^fP.N. Lebedev Physical Institute, 53 Leninsky Prosp., 117991 Moscow, Russia
^gDepartment of Physics, College of Science, Swansea University, Swansea SA2 8PP, United Kingdom
^hUniversité d'Evry-Val d'Essonne, Université Paris-Saclay, Boulev. François Mitterand, F-91000 Evry, France
ⁱDepartment of Physics, Stockholm University, SE-10691 Stockholm, Sweden
^jUniversité de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
^kCSNSM-IN2P3-CNRS, Université de Paris Sud, F-91405 Orsay, France
^lDepartment of Accelerator Science, Korea University Sejong Campus, Sejong-ro 2511, 0019 Sejong, Republic of Korea
^mCenter for Underground Physics, Institute for Basic Science, 70 Yuseong-daero 1689-gil, Yuseong-gu, Daejeon 34047, Korea
ⁿNational Centre for Nuclear Research (NCBJ), A. Soltana 7, 05-400 Otwock (Swierk), Poland
^oInstitute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
^pCERN, 1211 Geneva 23, Switzerland
^qInstitut Max von Laue-Paul Langevin (ILL), 71 av. des Martyrs, Grenoble, France, F-38042
^rQUANTUM, Institut für Physik, Johannes Gutenberg Universität, D-55128 Mainz, Germany
^sUlmer Fundamental Symmetries Laboratory, RIKEN, 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan

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We have developed a PbWO₄ (PWO) detector with a large dynamic range to measure the intensity of a positron beam and the absolute density of the ortho-positronium (o-Ps) cloud it creates. A simulation study shows that a setup based on such detectors may be used to determine the angular distribution of the emission and reflection of o-Ps to reduce part of the uncertainties of the measurement. These will allow to improve the precision in the measurement of the cross-section for the (anti)hydrogen formation by (anti)proton-positronium charge exchange and to optimize the yield of antihydrogen ion which is an essential parameter in the GBAR experiment.

DOI:10.12693/APhysPolA.137.122
PACS numbers: 78.70.Bj, 41.75.Fr, 36.10.Dr