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Further search for a neutral boson with a mass around 9 MeV/ [iopmath latex="$c^2$"] c2 [/iopmath]

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Two dedicated experiments on internal pair conversion (IPC) of isoscalar M1 transitions were carried out in order to test a 9 MeV/ [iopmath latex="$c^2$"] c2 [/iopmath] X-boson scenario. In the 7Li( [iopmath latex="$\rm p, e^+e^-)^8$"] p,e+e-)8 [/iopmath] Be reaction at 1.1 MeV proton energy to the predominantly [iopmath latex="$T = 0$"] T = 0 [/iopmath] level at 18.15 MeV, a significant deviation from IPC was observed at large pair correlation angles. In the 11B( [iopmath latex="$\rmd, {\rm n}\rme ^+\rme ^-)^{12}$"] d,ne+e-)12 [/iopmath] C reaction at 1.6 MeV, leading to the 12.71 MeV [iopmath latex="$1^+$"] 1+ [/iopmath] level with pure [iopmath latex="$T = 0$"] T = 0 [/iopmath] character, an anomaly was observed at [iopmath latex="$\sim$"] ~ [/iopmath] 9 MeV/ [iopmath latex="$c^2$"] c2 [/iopmath] . The compatibility of the results with the scenario is discussed.

Document Type: Miscellaneous

Affiliations: 1: Nationaal Instituut voor Kernfysica en Hoge-Energie Fysica, NL-1098 SJ, Amsterdam, The Netherlands 2: Institut für Kernphysik der Johann Wolfgang Goethe-Universität, D-60486 Frankfurt am Main, Germany 3: Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany 4: Kernfysisch Versneller Instituut, 9747 AA Groningen, The Netherlands 5: Laboratory of Particle Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow Region, Russia

Publication date: January 1, 2001

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