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anomalous internal pair conversion as a sign for elusive light neutral particles

anomalous internal pair conversion as a sign for elusive light neutral particles. e +. e –. anomalous internal pair conversion as a sign for elusive light neutral particles. e +. e –. co-authors. Margo Csatl ó s 4 Zoltan G á csi 4 Janos Guly á s 4 Mathias Hunyadi 4

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anomalous internal pair conversion as a sign for elusive light neutral particles

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  1. anomalous internal pair conversion as a sign for elusive light neutral particles e+ e– Fokke de Boer

  2. anomalous internal pair conversion as a sign for elusive light neutral particles e+ e– Fokke de Boer

  3. co-authors Margo Csatlós 4 Zoltan Gácsi 4 Janos Gulyás 4 Mathias Hunyadi 4 Attila Krasznahorkay 4 Zoltan Máté4 René van Dantzig 5 Tjeerd Ketel 5 Johan van Klinken 1 Helmut Bokemeyer 2 Klaus Bethge 3 Oliver Fröhlich 3 Alkis Müller 3 Kurt Stiebing 3 1 Groningen 2 Darmstadt 3 Frankfurt 4 Debrecen 5 Amsterdam

  4. light neutral particles branching ratios • upper limits • in emulsions • in nuclear transitions • spectroscopy • and dark matter pair production anomalous IPC fantasy 511 keV radiation

  5. candidate bosons • light Higgs (0+) to explain muonic X-rays anomalies Watson and Sundaresan (1971) • axion, a light pseudoscalar boson (0-) invented to prevent large CP-violations, Peccei and Quinn (1978) • U-boson a supersymmetric gauge boson (1+, 1-) , Fayet (1981)

  6. particle data book

  7. allowed window (not for T=1 axions)

  8. emulsion events

  9. spin-parity conservation.

  10. width

  11. number of IPC pairs (a.u.) correlation angle ω (degrees)

  12. detector array

  13. studied reactions

  14. alpha nuclei

  15. agreement with E1-IPC in 12C

  16. agreement with IPC in 12C and a deviation in 8Be 11B(p,g)12C 1-, T=1, 17.2 MeV 7Li(p,g)8Be 1+, T=1, 17.6 MeV Phys.Lett. B388 (1996) 235

  17. isoscalar decay from 18.15 MeV in 8Be

  18. an isoscalar boson scenario with mass of 9 MeV/c2, with spin 0- or 1+, and coupling strength αXproportional to the isoscalar width in the magnetic transition. results from IKF, KVI and SUNY branching ratios and widths

  19. KVI annual report 2002

  20. 16O (0-,T=0) 10.96 MeV decay

  21. 16O (0-,T=0) 10.95 MeV decay (M0 transition !!) To be published in Phys. Rev. Lett.

  22. boson search program

  23. 8Be (1+,T=1) 17.64 MeV decay

  24. 8Be (1+,T=0) 18.15 MeV decay

  25. 16O (0-,T=0) 10.96 MeV decay

  26. 12C (1+,T=0) 12.71 MeV decay

  27. 12C (1+,T=1) 17.23 MeV decay

  28. 16O (0+,T=0) 6.05 MeV decay

  29. 16O 6.05, 8.87, and 10.96 MeV decay

  30. INTEGRAL satellite • SPI data are consistent with positrons that originate from centre of the Galaxy and either: • low-mass X-ray binaries, • novae, • type Ia supernovae, • or possibly light dark matter.

  31. summary • anomalous internal pair conversion is observed in isoscalar nuclear transitions • magnetic monopole transition in 16O is found • several candidates for isoscalar neutral bosons in the 2-15 MeV mass region are reported • one of the vector boson candidates may be the U-boson and be intermediate in the annihilation of light dark matter

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