Intrinsic neutron background of nuclear emulsions for directional Dark Matter searches
A. Alexandrov, T. Asada, A. Buonaura, L. Consiglio, N. D'Ambrosio, G. De Lellis, A. Di Crescenzo, N. Di Marco, M. L. Di Vacri, S. Furuya, G. Galati, V. Gentile,… 展开作者
A. Alexandrov, T. Asada, A. Buonaura, L. Consiglio, N. D'Ambrosio, G. De Lellis, A. Di Crescenzo, N. Di Marco, M. L. Di Vacri, S. Furuya, G. Galati, V. Gentile, T. Katsuragawa, M. Laubenstein, A. Lauria, P. F. Loverre, S. Machii, P. Monacelli, M. C. Montesi, T. Naka, F. Pupilli, G. Rosa, O. Sato, P. Strolin, V. Tioukov, A. Umemoto, M. Yoshimoto
Recent developments of the nuclear emulsion technology led to the production of films with nanometric silver halide grains suitable to track low energy nuclear recoils with submicrometric length. This improvement opens the way to a directional Dark Matter detection, thus providing an innovative and complementary approach to the on-going WIMP searches. An important background source for these searches is represented by neutron-induced nuclear recoils that can mimic the WIMP signal. In this paper we provide an estimation of the contribution to this background from the intrinsic radioactive contamination of nuclear emulsions. We also report the induced background as a function of the read-out threshold, by using a GEANT4 simulation of the nuclear emulsion, showing that it amounts to about 0.06 neutrons per year per kilogram, fully compatible with the design of a 10 kg$\times$year exposure.
A Large-Area Optical Time Projection Chamber for Hard X-ray Polarimetry with Directional Imaging of Low-Energy Electron Recoils
Gran Sasso Science Institute（格兰萨索科学研究所）；INFN Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所大萨索国家实验室）；INFN Laboratori Nazionali di Frascati（意大利国家核物理研究所弗拉斯卡蒂国家实验室）；IAPS - INAF Istituto di Astrofisica e Planetologia Spaziali（空间天体物理学和行星学研究所-意大利国家天体物理研究所）
He-CF4-CH4 ternary mixtures as target gas for the CYGNO directional dark matter experiment
University of Coimbra（科英布拉大学）；Universit`a Roma TRE（罗马三所大学）；Istituto Nazionale di Fisica Nucleare（意大利国家核物理研究所；罗马三分所）；Sezione di Roma Tre（格兰萨索科学研究所）；Gran Sasso Science Institute（意大利国家核物理研究所；格兰萨索国家实验室）；Istituto Nazionale di Fisica Nucleare（意大利国家核物理研究所；弗拉斯卡蒂国家实验室）；Laboratori Nazionali del Gran Sasso（意大利国家新科技、能源和可持续经济发展局弗拉斯卡蒂研究中心）；Istituto Nazionale di Fisica Nucleare（茹伊斯迪福拉联邦大学）；Laboratori Nazionali di Frascati（罗马大学）；ENEA Centro Ricerche Frascati（意大利国家核物理研究所；罗马分所）；Universidade Federal de Juiz de Fora（罗马大学）；Universit`a di Roma Sapienza（谢菲尔德大学）；Istituto Nazionale di Fisica Nucleare；Sezione di Roma；Sapienza Universit`a di Roma；University of Sheffield
