6–11 Jun 2010
Village de Vacances de Lamoura
Europe/Zurich timezone

High precision measurement of the final-state distribution in 8B decay

Not scheduled
Village de Vacances de Lamoura

Village de Vacances de Lamoura

39310 Lamoura France
Board: 7
poster Fundamental interactions

Speaker

Dr T. Roger (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium)

Description

The measurement of the undistorted spectrum of 8B neutrinos is necessary to extract information on the neutrino oscillation parameters from the solar neutrino spectrum observed on Earth. Several experiments aiming at determining this intrinsic spectrum have been performed using different techniques. The latest results of Bhattacharya et al. [1] and Winter et al. [2] show large disagreement with the measurement of Ortiz et al. [3]. We have measured with a high precision the 8B beta final state distribution, reducing the systematic uncertainties. For this purpose, a 18.7 MeV 8B beam from the TRIµP separator at KVI was implanted in a 75 µm thick double-sided stripped silicon detector [4,5]. The detection of the two alpha particles resulting from the decay of the first excited 2+ state in 8Be, together with a full beta-summing GEANT4 simulation, enabled us to reconstruct the final state distribution with a precision of about 5 keV down to 350 keV excitation energy. The R-matrix fit of this distribution will be presented, and the obtained neutrino distribution will be compared with the previously obtained results. [1] M. Bhattacharya et al., Phys. Rev. C73, 055802 (2006) [2] W.T. Winter et al., Phys. Rev. Lett. 91, 252501 (2003) [3] C.E. Ortiz et al., Phys. Rev. Lett. 85, 2909 (2000) [4] D. Smirnov et al., Nucl. Instr. and Meth. A547, 480 (2005) [5] J. Büscher et al., Nucl. Instr. and Meth. B266, 4652 (2008)
Is this an invited talk? (please answer yes or no) no
Would you prefer your contribution to be an oral presentation? (please answer yes or no) yes
Would you prefer your contribution to be a poster presentation? (please answer yes or no) no

Primary authors

Dr J. Büscher (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Prof. R. Raabe (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr T. Roger (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium)

Co-authors

Dr A. Perea (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr A. Saastamoinen (Department of Physics, University of Jyväskylä, Finland) Dr B. Bastin (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr B. Santra (KVI GroningenKernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr D. Galaviz (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr D.J. Van der Hoek (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr E. Traykov (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr G.S. Giri (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr H.O.U. Fynbo (Department of Physics and Astronomy, University of Aarhus, Denmark) Dr H.W. Wilschut (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr J. Cruz (Dep. Fisica, FCT, Universidade Nova de Lisboa, Portugal) Dr J. Äystö (Department of Physics, University of Jyväskylä, Finland) Dr K. Jungmann (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr K. Riisager (Department of Physics and Astronomy, University of Aarhus, Denmark) Dr L. Fraile (Departamento Fisica Atomica, Universidad Complutense, Madrid, Spain) Dr L.R. Gasques (Centro de Fisica Nuclear da Universidade de Lisboa, Portugal) Dr M. Alcorta (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr M. Carmona-Gallardo (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr M. Huyse (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr M. Lantz (Centro de Fisica Nuclear da Universidade de Lisboa, Portugal) Dr M. Sohani (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr M.J.G. Borge (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr O. Kirsebom (Department of Physics and Astronomy, University of Aarhus, Denmark) Dr O. Tengblad (Instituto de Estructura de la Materia, CSIC, Madrid, Spain) Dr O.O. Versolato (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr P. Dendooven (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Prof. P. Van Duppen (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr P.D. Shidling (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands) Dr S. Hyldegaard (Department of Physics and Astronomy, University of Aarhus, Denmark) Dr T. Cocolios (Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Belgium) Dr W.L. Kruithof (Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, The Netherlands)

Presentation materials

There are no materials yet.