On the X(17) light-particle candidate observed in nuclear transitions

A. J. Krasznahorkay, M. Csatlós, L. Csige, D. Firak, J. Gulyás, Nagy, N. Sas, J. Tímár, T. G. Tornyi, A. Krasznahorkay

Research output: Contribution to journalArticle

Abstract

Recently, we observed an anomalous internal pair creation for the M1 transition depopulating the 18.15 MeV isoscalar 1 + state in 8 Be. The deviation from the theoretical prediction can be described by assuming the creation and subsequent decay of a new, light boson with a mass of 16.7 MeV/c 2 . In order to clarify the interpretation, we re-investigated the 8 Be 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 ). We investigated also the high-energy (21 MeV) J π = 0 → 0 + transition in 4 He and got a consistent result for the X(17) particle.

Original languageEnglish
Pages (from-to)675-684
Number of pages10
JournalActa Physica Polonica B
Volume50
Issue number3
DOIs
Publication statusPublished - Mar 1 2019

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On the X(17) light-particle candidate observed in nuclear transitions. / Krasznahorkay, A. J.; Csatlós, M.; Csige, L.; Firak, D.; Gulyás, J.; Nagy; Sas, N.; Tímár, J.; Tornyi, T. G.; Krasznahorkay, A.

In: Acta Physica Polonica B, Vol. 50, No. 3, 01.03.2019, p. 675-684.

Research output: Contribution to journalArticle

Krasznahorkay, AJ, Csatlós, M, Csige, L, Firak, D, Gulyás, J, Nagy, Sas, N, Tímár, J, Tornyi, TG & Krasznahorkay, A 2019, 'On the X(17) light-particle candidate observed in nuclear transitions', Acta Physica Polonica B, vol. 50, no. 3, pp. 675-684. https://doi.org/10.5506/APhysPolB.50.675
Krasznahorkay, A. J. ; Csatlós, M. ; Csige, L. ; Firak, D. ; Gulyás, J. ; Nagy ; Sas, N. ; Tímár, J. ; Tornyi, T. G. ; Krasznahorkay, A. / On the X(17) light-particle candidate observed in nuclear transitions. In: Acta Physica Polonica B. 2019 ; Vol. 50, No. 3. pp. 675-684.
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AU - Csige, L.

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AU - Gulyás, J.

AU - Nagy,

AU - Sas, N.

AU - Tímár, J.

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