阈值附近过程的横截面（{e^{+}e^{-}\to n\bar{n}}\)

IF 0.3 4区物理与天体物理 Q4 PHYSICS, NUCLEAR Physics of Atomic Nuclei Pub Date : 2024-10-07 DOI:10.1134/S1063778824700637

M. N. Achasov, A. Yu. Barnyakov, E. V. Bedarev, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, Yu. M. Zharinov, L. V. Kardapoltsev, A. S. Kasaev, A. A. Kattsin, D. P. Kovrizhin, A. A. Korol, A. S. Kupich, A. P. Kryukov, A. P. Lysenko, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, S. A. Rastigeev, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, Yu. V. Usov, A. G. Kharlamov, D. E. Chistyakov, Yu. M. Shatunov, S. P. Sherstyuk, D. A. Shtol

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引用次数: 0

摘要

在从阈值到1908 MeV的质心能量范围内测量了（e^{+}e^{-}\to n\bar{n}\ ）横截面。测量横截面的实验是在VEPP-2000 \(e^{+}e^{-}\)对撞机的13个能点上进行的。SND 探测器用于探测产生的中子-反中子（\(n\bar{n}\）事件。量热计上的一个特殊时间测量系统被用来选择延时的\(n\bar{n}\)事件。测量到的\(e^{+}e^{-}\to n\bar{n}\) 截面为 0.4-0.6 nb。在所研究的能量范围内，中子的有效时间形式因子从 0.3 到 0.6 不等。

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

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.

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来源期刊

Physics of Atomic Nuclei 物理-物理：核物理

CiteScore

0.60

自引率

25.00%

发文量

审稿时长

3-6 weeks

期刊介绍： Physics of Atomic Nuclei is a journal that covers experimental and theoretical studies of nuclear physics: nuclear structure, spectra, and properties; radiation, fission, and nuclear reactions induced by photons, leptons, hadrons, and nuclei; fundamental interactions and symmetries; hadrons (with light, strange, charm, and bottom quarks); particle collisions at high and superhigh energies; gauge and unified quantum field theories, quark models, supersymmetry and supergravity, astrophysics and cosmology.