New results on the 8Be anomaly

A. Krasznahorkay, M. Csatlós, L. Csige, Z. Gácsi, J. Gulyás, Nagy, N. Sas, J. Tímár, T. G. Tornyi, I. Vajda, A. Krasznahorkay

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

Recently, we observed anomalous internal pair creation for the M1 transition depopulating the 18.15 MeV isoscalar 1+ state in 8Be. We observed a significant (σ = 7.37) peak-like deviation from the predicted angular correlation of the e+ e pairs at θ = 140°. To the best of our knowledge no nuclear physics related description of such deviation can be made. However, the deviation can be described by assuming the creation and subsequent decay of a boson with mass of ≈17 MeV. In order to clarify the interpretation, we re-investigated the 8Be anomaly with an improved, and independent setup. We have confirmed the signal of the assumed X(17) particle and constrained its mass (m 0 c 2 = 17.01(16) MeV) and branching ratio compared to the γ-decay (B x = 6(1) × 10-6).

Original languageEnglish
Article number012028
JournalJournal of Physics: Conference Series
Volume1056
Issue number1
DOIs
Publication statusPublished - Jul 19 2018
EventConference on Neutrino and Nuclear Physics 2017, CNNP 2017 - Catania, Italy
Duration: Oct 15 2017Oct 21 2017

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anomalies
deviation
decay
nuclear physics
angular correlation
bosons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

New results on the 8Be anomaly. / Krasznahorkay, A.; Csatlós, M.; Csige, L.; Gácsi, Z.; Gulyás, J.; Nagy; Sas, N.; Tímár, J.; Tornyi, T. G.; Vajda, I.; Krasznahorkay, A.

In: Journal of Physics: Conference Series, Vol. 1056, No. 1, 012028, 19.07.2018.

Research output: Contribution to journalConference article

Krasznahorkay, A, Csatlós, M, Csige, L, Gácsi, Z, Gulyás, J, Nagy, Sas, N, Tímár, J, Tornyi, TG, Vajda, I & Krasznahorkay, A 2018, 'New results on the 8Be anomaly', Journal of Physics: Conference Series, vol. 1056, no. 1, 012028. https://doi.org/10.1088/1742-6596/1056/1/012028
Krasznahorkay, A. ; Csatlós, M. ; Csige, L. ; Gácsi, Z. ; Gulyás, J. ; Nagy ; Sas, N. ; Tímár, J. ; Tornyi, T. G. ; Vajda, I. ; Krasznahorkay, A. / New results on the 8Be anomaly. In: Journal of Physics: Conference Series. 2018 ; Vol. 1056, No. 1.
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AU - Nagy,

AU - Sas, N.

AU - Tímár, J.

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