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Title: Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles

Abstract

In this paper we report on a systematic search for a new light neutral boson in the mass range between 5 and 15 MeV in nuclear decay from high energy levels. Its signature is found in a deviation in the angular correlation of de-exciting e+e- pairs from conventional internal pair conversion (IPC) which is explained by superposition of its two-body decay. With an e+e- pair-spectrometer, a number of transitions has been investigated in the {alpha}-nuclei 8Be, 12C and 16O, 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 ranging from 10-1 to 10-6. If these deviations are all related to the two-body decay of an X-boson, this observation implies additional X-bosons. An analysis of all angular spectra with a boson search program, yields a pandemonium of more than ten candidate bosons.

Authors:
 [1]
  1. Nationaal Insituut voor Kernfysica en Hoge-Energie Fysica. NL-1098 SJ Amsterdam (Netherlands)
Publication Date:
OSTI Identifier:
20719705
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 802; Journal Issue: 1; Conference: ENS'05: International symposium on exotic nuclear systems, Debrecen (Hungary), 20-25 Jun 2005; Other Information: DOI: 10.1063/1.2140642; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR CORRELATION; AXIONS; BERYLLIUM 8; BRANCHING RATIO; CARBON 12; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; INTERMEDIATE BOSONS; INTERNAL PAIR PRODUCTION; LIGHT IONS; MEV RANGE 01-10; MEV RANGE 10-100; NEUTRAL PARTICLES; NUCLEAR DECAY; OXYGEN 16; PAIR SPECTROMETERS; TWO-BODY PROBLEM

Citation Formats

Boer, Fokke de. Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles. United States: N. p., 2005. Web. doi:10.1063/1.2140642.
Boer, Fokke de. Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles. United States. doi:10.1063/1.2140642.
Boer, Fokke de. Mon . "Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles". United States. doi:10.1063/1.2140642.
@article{osti_20719705,
title = {Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles},
author = {Boer, Fokke de},
abstractNote = {In this paper we report on a systematic search for a new light neutral boson in the mass range between 5 and 15 MeV in nuclear decay from high energy levels. Its signature is found in a deviation in the angular correlation of de-exciting e+e- pairs from conventional internal pair conversion (IPC) which is explained by superposition of its two-body decay. With an e+e- pair-spectrometer, a number of transitions has been investigated in the {alpha}-nuclei 8Be, 12C and 16O, 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 ranging from 10-1 to 10-6. If these deviations are all related to the two-body decay of an X-boson, this observation implies additional X-bosons. An analysis of all angular spectra with a boson search program, yields a pandemonium of more than ten candidate bosons.},
doi = {10.1063/1.2140642},
journal = {AIP Conference Proceedings},
number = 1,
volume = 802,
place = {United States},
year = {Mon Nov 21 00:00:00 EST 2005},
month = {Mon Nov 21 00:00:00 EST 2005}
}