danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8323-2020-64-2-159-163dan-866Research ArticleФИЗИКАPHYSICSО полном сечении реакции γd → π–pp в пороговой области энергийTotal cross section of the reaction γd → π–pp in the threshold energy regionКокоулинаЕ. С.KokoulinaE. S.

Кокоулина Елена Сергеевна – д-р физ.-мат. наук, доцент, начальник сектора.

ЛФВЭ ОИЯИ, 141980, Дубна

Kokoulina Elena S. – D. Sc. (Physics and Mathematics), Assistant Professor, Head of the Sector.

LHEP JINR, 141980, Dubna

kokoulina@jinr.ruЛевчукМ. И.LevchukM. I.

Левчук Михаил Иванович – д-р физ.-мат. наук, гл. науч. сотрудник.

пр. Независимости, 68-2, 220072, Минск

Levchuk Michael I. – D. Sc. (Physics and Mathematics), Chief researcher.

68-2, Nezavisimosti Ave., 220072, Minsk

levchuk@dragon.bas-net.byНевмержицкийМ. Н.NevmerzhitskyM. N.

Невмержицкий Максим Николаевич – науч. сотрудник.

ул. Академическая, 16, 220072, Минск

Nevmerzhitsky Maxim N. – Researcher.

16, Akademicheskaya Str., 220072, Minsk

nevmerzhmn@gmail.comШуляковскийР. Г.ShulyakovskyR. G.

Шуляковский Роман Георгиевич – канд. физ.-мат. наук, доцент, директор.

ул. Академическая, 16, 220072, Минск

Shulyakovsky Roman G. – Ph. D. (Physics and Mathematics), Assistant Professor, Director.

16, Akademicheskaya Str., 220072, Minsk

shulyakovsky@iaph.bas-net.byОбъединенный институт ядерных исследованийJoint Institute for Nuclear ResearchИнститут физики имени Б. И. Степанова Национальной академии наук БеларусиB. I. Stepanov Institute of Physics of the National Academy of Sciences of BelarusИнститут прикладной физики Национальной академии наук БеларусиInstitute of Applied Physics of the National Academy of Sciences of Belarus202017052020642159163Copyright © Кокоулина Е.С., Левчук М.И., Невмержицкий М.Н., Шуляковский Р.Г., 20202020Кокоулина Е.С., Левчук М.И., Невмержицкий М.Н., Шуляковский Р.Г.Kokoulina E.S., Levchuk M.I., Nevmerzhitsky M.N., Shulyakovsky R.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/866

Рассчитано полное сечение некогерентного фоторождения π–-мезона на дейтроне при пороговых энергиях реакции от 145 до 160 МэВ. Для описания реакции был использован диаграммный подход. Учтены вклады от диаграмм, которые соответствуют плосковолновому импульсному приближению, а также NN- и πN-взаимодействиям в конечном состоянии. Проведено сравнение вычисленных сечений с результатами недавних измерений, выполненных в лаборатории MAX IV Лундского университета. Имеется хорошее согласие с данными при энергиях фотона от 147 до 155 МэВ. Однако при 158 и 160 МэВ теоретические предсказания заметно превышают измеренные сечения.

In the framework of the diagrammatic approach, the total cross section of near-threshold π– photoproduction on the deuteron is calculated. Contributions of the diagrams corresponding to the plane wave impulse approximation as well as to NN- and πN-interactions in the final state have been taken into account. We have compared the theoretical predictions with the results of the recent measurements performed at the MAX IV laboratory of the Lund University. There is good agreement with the data at photon energies from 147 to 155 MeV. However, at 158 and 160 MeV, the theoretical predictions significantly overestimate the measured cross sections.

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The authors declare that there are no conflicts of interest present.