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NEXT, a HPGXe TPC for neutrinoless double beta decay searches

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arxiv 0907.4054 v1 pith:L52CDXH3 submitted 2009-07-23 hep-ex nucl-exphysics.ins-det

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-exnucl-exphysics.ins-det
keywords decaydouble-betaneutrinolessconceptdesigndetectionsearchesbackground
verification ladder T0 review T1 audit T2 compute T3 formal
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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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