NEXT, a HPGXe TPC for neutrinoless double beta decay searches

The NEXT Collaboration: F. Granena , T. Lux , F. Nova , J. Rico , F. Sanchez , D.R. Nygren , J.A.S. Barata , F.I.G.M. Borges

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C.A.N. Conde T.H.V.T. Dias L.M.P. Fernandes E.D.C. Freitas J.A.M. Lopes C.M.B. Monteiro J.M.F. dos Santos F.P. Santos L.M.N. Tavora J.F.C.A. Veloso E. Calvo I. Gil-Botella P. Novella C. Palomares A. Verdugo I. Giomataris E. Ferrer-Ribas J.A. Hernando-Morata D. Martinez X. Cid M. Ball S. Carcel A. Cervera J. Diaz A. Gil J.J. Gomez-Cadenas J. Martin-Albo F. Monrabal J. Munoz-Vidal L. Serra M. Sorel N. Yahlali R. Esteve Bosch C.W. Lerche J.D. Martinez F.J. Mora A. Sebastia A. Tarazona J.F. Toledo M. Lazaro J.L. Perez L. Ripoll J.M. Carmona S. Cebrian T. Dafni J. Galan H. Gomez F.J. Iguaz I.G. Irastorza G. Luzon J. Morales A. Rodriguez J. Ruz A. Tomas J.A. Villar

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classification ✦ hep-ex nucl-exphysics.ins-det

keywords decaydouble-betaneutrinolessconceptdesigndetectionsearchesbackground

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We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory.

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NEXT, a HPGXe TPC for neutrinoless double beta decay searches

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