Cross Section of the Process $${e^{+}e^{-}\to n\bar{n}}$$ near the Threshold

作者：М. Н. Ачасов, A. Barnyakov, E. V. Bedarev, K. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. Dimova, В. П. Дружинин, V. N. Zhabin, Yu. M. Zharinov, L. V. Kardapoltsev, A. S. Kasaev, A. A. Kattsin, D. P. Kovrizhin, A. A. Korol, A. Kupich, A. P. Kryukov, А. П. Лысенко, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, Е. В. Пахтусова, K. V. Pugachev, S. A. Rastigeev, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, З. К. Силагадзе, I. K. Surin, Y. Usov, A. G. Kharlamov, D. E. Chistyakov, Yu. M. Shatunov, S. P. Sherstyuk, D. Shtol · 发表于：Physics of Atomic Nuclei · 年份：2024 · DOI：10.1134/s1063778824700637 · 被引用次数：6 · 研究领域：Nuclear physics research studies、Quantum chaos and dynamical systems、Markov Chains and Monte Carlo Methods

The $$e^{+}e^{-}\to n\bar{n}$$ cross section was measured at center of mass (c.m.) energies from the threshold to 1908 MeV. The experiment to measure the cross section has been carried out at the VEPP-2000 $$e^{+}e^{-}$$ collider in 13 energy points. The SND detector is used to detect the produced neutron–antineutrons ( $$n\bar{n}$$ ) events. A special time measurement system on the calorimeter was used to select the time-delayed $$n\bar{n}$$ events. The measured $$e^{+}e^{-}\to n\bar{n}$$ cross section is 0.4–0.6 nb. The neutron effective timelike form factor in the energy range under study varies from 0.3 to 0.6.