Intrinsic neutron background of nuclear emulsions for directional Dark Matter searches |
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| Institution: | 1. INFN Sezione di Napoli, Napoli I-80125, Italy;2. Nagoya University, Nagoya J-464-8602, Japan;3. Dipartimento di Fisica dell''Università Federico II di Napoli, Napoli I-80125, Italy;4. INFN – Laboratori Nazionali del Gran Sasso, Assergi I-67010 (LAquila), Italy;5. INFN Sezione di Roma, Roma I-00185, Italy;6. Dipartimento di Fisica dell''Università di Roma Sapienza, Roma I-00185, Italy;7. INFN – Laboratori Nazionali di Frascati dell''INFN, Frascati I-00044 (Roma), Italy;1. Gran Sasso Science Institute, viale Francesco Crispi, 7 L’Aquila 67100 (AQ), Italy;2. Institute for Space Sciences (CSIC/IEEC), Barcelona E-08193, Spain;3. Dublin Institute of Advanced Studies, 10 Burlington Road, Dublin 4, Ireland;4. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg D-69117, Germany;1. Institute of Nuclear Physics PAN, Kraków, Poland;2. Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology, Karlsruhe, Germany;3. Argelander Institute for Astronomy (AIfA), Bonn, Germany;1. Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Rodovia José Aurélio Vilela, 11999, Cidade Universitária, CEP 37715-400, Poços de Caldas, MG, Brazil;2. Escola de Ciência e Tecnologia, Universidade Federal do Rio Grande do Norte, Campus Universitário, s/n, CEP 59072-970, Natal, Brazil |
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| Abstract: | 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 neutron-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 per year per kilogram, fully compatible with the design of a 10 kg × year exposure. |
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