P    JINST First measurement of the surface tension of a liquid scintillator based on Linear Alkylbenzene (HYBLENE 113) mixed with Diphenyloxazole J. Alt,  J. Arutinov,  O. Bezshyyko,  T. Bretz,  A. Brignoli,  A. Conaboy,  P. Deucher,  F. De Paola,  G. del Giudice,  C. di Cristo,  O. Fecarotta,  A. Fiorillo, ℎ H. Fischer,  H. Glückler,  C. Grewing,  A. Hollnagel,  H. Lacker,  A. Miano, ℎ G. Natour, , V. Orlov,  A. Prota, ℎ F. Rehbein,  A. Reghunath, , 1 A. Salzano, ℎ M. Schaaf,  C. Scharf,  J. Schmidt,  M. Schumann,  A. Vagts,  S. van Waasen,  M. Wurm  (SHiP SBT collaboration)  Physics Institute 3A, RWTH Aachen University, Sommerfeldstraße 16, 52074 Aachen, Germany  Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany  Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany  Forschungszentrum Jülich GmbH, Central Institute of Engineering, Electronics and Analytics, 52425 Jülich, Germany  Taras Shevchenko National University of Kyiv, Kyiv, Ukraine  Institut für Physik and PRISMA Cluster of Excellence, Johannes Gutenberg Universität Mainz, Mainz, Germany  Department of Civil, Building and Environmental Engineering, Università di Napoli “Federico II ”, Napoli, Italy ℎ Department of Structures for Engineering and Architecture, Università di Napoli “Federico II ”, Napoli, Italy E-mail: anupama.reghunath@physik.hu-berlin.de A: We measured the surface tension of linear alkylbenzene (LAB) HYBLENE 113 mixed with Diphenyloxazole (PPO) as well as of pure LAB HYBLENE 113 as part of material studies for the liquid-scintillator based surround background tagger (SBT) in the proposed SHiP experiment. The measurement was performed using the iron wire method and the surface tension for linear alkyl benzene HYBLENE 113 plus PPO was found to be ( 30.0 ± 0.6) mN/m 22.0 ± 0.5 °C and for pure HYBLENE 113, ( 29.2 ± 0.6) mN/m at 21.0 ± 0.5 °C. Corresponding author. arXiv:2201.12139v1 [physics.ins-det] 27 Jan 2022