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High Energy Physics - Phenomenology

arXiv:hep-ph/0511049 (hep-ph)
[Submitted on 4 Nov 2005 (v1), last revised 6 Jan 2006 (this version, v2)]

Title:Anomalous internal pair conversion signaling elusive light neutral particles

Authors:Fokke de Boer
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Abstract: In this paper we report on a systematic search for a neutral boson in the mass range between 5 and 15 MeV/c$^{2}$ in the decay of highly excited nuclei. Its signature is found a deviation in the angular correlation of the $e^+e^-$ pairs from conventional internal pair conversion (IPC) resulting from of its two-body decay kinematics. With an $e^{+}e^{-}$ pair-spectrometer, a number of transitions has been investigated in the
${\alpha}$--nuclei $^{8}$Be, $^{12}$C and $^{16}$O, following light ion induced reactions at low bombarding energies, first at IKF in Frankfurt and during the last years at ATOMKI in Debrecen. Startlingly, in all isoscalar transitions excess $e^{+}e^{-}$ pairs are found at large angles with branching ratios with respect to the total yield ranging from 10$^{-2}$ to 10$^{-6}$. If these deviations are all related to the two-body decay of an $X$-boson, this observation implies plural $X$-bosons. An analysis of all angular spectra with a boson search program, yields a pandemonium of more than ten candidate bosons.
Comments: 7 pages, 2 figures, contributed paper to the Int. Symposium on Exotic Nuclear Systems (ENS05), ATOMKI, Debrecen, Hungary, 20-25 June 2005
Subjects: High Energy Physics - Phenomenology (hep-ph); Astrophysics (astro-ph); Nuclear Experiment (nucl-ex)
Cite as: arXiv:hep-ph/0511049
  (or arXiv:hep-ph/0511049v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0511049
Related DOI: https://doi.org/10.1063/1.2140642

Submission history

From: Kees Huyser [view email]
[v1] Fri, 4 Nov 2005 15:17:33 UTC (48 KB)
[v2] Fri, 6 Jan 2006 10:31:19 UTC (40 KB)
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