Checking the 8Be Anomaly with a Two-Arm Electron Positron Pair Spectrometer
Tran The Anh, D. T. Tran, A. Krasznahorkay, A. Krasznahorkay, József Molnár, Zoltán Pintye, Nguyễn Ái Việt, Nguyen The Nghia, Do Thi Khanh Linh, Bui Thi Hoa, L. X. Chung, Nguyễn Tuấn Anh
Abstract
We have repeated the experiment performed recently by ATOMKI Laboratory (Debrecen, Hungary), which may indicate a new particle called X17 in the literature. In order to obtain a reliable and independent result, we used a different structure of the electron–positron pair spectrometer at the VNU University of Science. The spectrometer has two arms and simpler acceptance and efficiency as a function of the correlation angle, but the other conditions of the experiment were very similar to the published ones. We could confirm the presence of the anomaly measured at Ep = 1225 keV, which is above the Ep = 1040 keV resonance.