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

Csige, Lóránt and Krasznahorkay, Attila and Csatlós, Margit and Firak, Daniel and Gulyás, János and Nagy, Ádám and Sas, Nándor and Tímár, János and Tornyi, Tamás Gábor (2019) On the X(17) light-particle candidate observed in nuclear transitions. Acta Physica Polonica B, 50 (3). pp. 675-684. ISSN 0587-4254

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Recently, we observed an anomalous internal pair creation for the M1 transition depopulating the 18.15 MeV isoscalar 1+ state in 8Be. 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/c2. 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 (m0c2= 17.01(16) MeV) and branching ratio compared to the γ-decay (Bx=6(1)x10−6). We investigated also the high-energy (21 MeV) J=0−->0+ transition in 4He and got a consistent result for the X(17) particle.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC05 Physical nature of matter / részecskefizika
Depositing User: Dr. Lóránt Csige
Date Deposited: 23 Sep 2019 19:08
Last Modified: 23 Sep 2019 19:08

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