Searching for the double gamma-decay of the X particle

Nagy, Ádám and Csige, Lóránt and Csatlós, Margit and Gácsi, Zoltán and Ciemala, M and Hunyadi, Mátyás and Klaus, Tobias and Kmiecik, M and Maj, Adam and Pietralla, Norbert and Révay, Zsolt and Sas, Nándor and Stieghorst, Christian and Tímár, János and Tornyi, Tamás Gábor and Wasilewska, B (2019) Searching for the double gamma-decay of the X particle. Il Nuovo Cimento C, 42 (124). ISSN 2037-4909

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Abstract

The e−e+ decay of the candidate new particle X(17) has already been confirmed by previous experiments. However, theoretical models give different predictions for the spin and the parity of this particle. The double gamma-decay process could be an appropriate probe to shed light on such properties. Thus, for the first time, we searched for the gamma-gamma decay of X(17) created in nuclear transitions. In this paper, we report preliminary results of two experiments on the Jπ= 0− -> 0+ transition in 4He.

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