nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2025-1-175-178nuc-800Research ArticleСтатьиПРЕДВАРИТЕЛЬНЫЕ РЕЗУЛЬТАТЫ ИССЛЕДОВАНИЯ ОБОЛОЧЕЧНЫХ ЭФФЕКТОВ В МАССОВО-ЭНЕРГЕТИЧЕСКИХ РАСПРЕДЕЛЕНИЯХ ОСКОЛКОВ ДЕЛЕНИЯ СОСТАВНОГО ЯДРА 241Am*, ПОЛУЧЕНОГО В РЕАКЦИИ 240Pu(p,f) ПРИ ЭНЕРГИИ ПРОТОНОВ 7 МэВPRELIMINARY RESULTS OF THE STUDY OF SHELL EFFECTS IN MASS AND ENERGY DISTRIBUTIONS OF FISSION FRAGMENTS OF 241Am* IN 240Pu(p,f) REACTION AT INCIDENT PROTON ENERGY OF 7 MeVhttps://orcid.org/0000-0003-2404-6428ПанА. Н.PanA. N.

Алматы

Almaty

a.pan@inp.kzАлимовД. К.AlimovD. K.

Алматы

Almaty

d_alimov@inp.kzКовальчукК. В.KovalchukK. V.

Алматы

Almaty

kkv@inp.kzБуртебаевН.BurtebayevN.

Алматы

Almaty

burteb@inp.kzДжансеитовД. М.JanseitovD. M.

Алматы

Almaty

d.janseit@inp.kzКошербаеваР. К.KosherbayevaR. K.

Алматы

Almaty

r.kosherbayeva@inp.kzРГП «Институт ядерной физики» МЭ РК; Казахский национальный университет имени аль-ФарабиКазахстанRSE “Institute of nuclear Physics” ME RK; Kazakh National University named after al-FarabiKazakhstanРГП «Институт ядерной физики» МЭ РКRSE “Institute of nuclear Physics” ME RK20250104202501175178Copyright © Пан А.Н., Алимов Д.К., Ковальчук К.В., Буртебаев Н., Джансеитов Д.М., Кошербаева Р.К., 20252025Пан А.Н., Алимов Д.К., Ковальчук К.В., Буртебаев Н., Джансеитов Д.М., Кошербаева Р.К.Pan A.N., Alimov D.K., Kovalchuk K.V., Burtebayev N., Janseitov D.M., Kosherbayeva R.K.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://journals.nnc.kz/jour/article/view/800

Оболочечные эффекты оказывают наиболее выраженное влияние на массово-энергетические распределения осколков деления при низких энергиях возбуждения делящегося составного ядра. Поэтому для исследования поведения оболочечных эффектов было измерено массово-энергетическое распределение осколков деления ядра 241Am*, полученного в реакции 240Pu(p,f) при энергии налетающих протонов 7 МэВ. Эта энергия значительно ниже кулоновского барьера для данной реакции, что ведет к низкому сечению реакции и малой скорости набора данных. Ввиду этого мы представляем предварительные результаты исследования, после набора дополнительной статистики возможно будет сделать окончательные выводы. Измерение проводилось методом 2Е на ускорителе У-150М Института ядерной физики, г. Алматы. Полученное предварительное массово-энергетическое распределение было разложено по вкладам отдельных оболочек, включая деформированные оболочки, предполагая, что форма вклада оболочки представляет собой гаусс.

Shell effects are most pronounced in mass and energy distributions of fission fragments at the lowest excitation energy of compound nucleus. To study shell effects the mass and energy distributions of fission fragments of 241Am* compound nucleus in 240Pu(p,f) reaction were measured at incident proton energy of 7 MeV. This energy is substantially lower than coulomb barrier for this reaction leading to very small reaction cross-section and low speed of data acquisition. Due to that the results we provide are only preliminary and final results will be provided later after acquisition of additional statistics. The measurement was carried out by 2E method on U-150M accelerator of Institute of Nuclear Physics, Almaty city, Kazakhstan. The acquired preliminary mass and energy distributions were decomposed into yields of separate fission shells assuming that the shape of mass yield of each fission mode is gauss distribution.

оболочечные эффектыделение ядраплутоний-240америций-241осколки делениямода деленияshell effectsfission fragmentsplutonium-240americium-241fission fragmentsfission modeThe work was carried out with the support of the Ministry of Energy of the Republic of Kazakhstan, within the framework of the program BR23891530 «Development of complex scientific research in the field of nuclear and radiation physics based on Kazakhstan's accelerator complexes».The work was carried out with the support of the Ministry of Energy of the Republic of Kazakhstan, within the framework of the program BR23891530 «Development of complex scientific research in the field of nuclear and radiation physics based on Kazakhstan's accelerator complexes».ReferencesK.B. Gikal et al., Proton induced fission of 232Th at intermediate energies // Physics of Atomic Nuclei. – 2016. – Vol. 79, No. 9–10. – Pp. 1367–1374.K.B. Gikal et al., Proton induced fission of 232Th at intermediate energies // Physics of Atomic Nuclei. – 2016. – Vol. 79, No. 9–10. – Pp. 1367–1374.U. Brosa et al., Nuclear Scission // Phys. Rep. – 1990. – Vol. 197. – P. 167.U. Brosa et al., Nuclear Scission // Phys. Rep. – 1990. – Vol. 197. – P. 167.G. Scamps & C. Simenel, Impact of pear-shaped fission fragments on mass-asymmetric fission in actinides // Nature. – 2018. – Vol. 564. – P. 382.G. Scamps & C. Simenel, Impact of pear-shaped fission fragments on mass-asymmetric fission in actinides // Nature. – 2018. – Vol. 564. – P. 382.G. Scamps & C. Simenel, Effect of shell structure on the fission of sub-lead nuclei // Phys. Rev. C. – 2019. – Vol. 100. – P. 041602(R).G. Scamps & C. Simenel, Effect of shell structure on the fission of sub-lead nuclei // Phys. Rev. C. – 2019. – Vol. 100. – P. 041602(R).E. Prasad et. al., Systematics of the mass-asymmetric fission of excited nuclei from 176Os to 206Pb // Phys. Lett. B. – 2020. – Vol. 811. – P. 135941.E. Prasad et. al., Systematics of the mass-asymmetric fission of excited nuclei from 176Os to 206Pb // Phys. Lett. B. – 2020. – Vol. 811. – P. 135941.B. M. A. Swinton-Bland et. al., Mass-asymmetric fission of 205,207,209Bi at energies close to the fission barrier using proton bombardment of 204,206,208Pb // Phys. Rev. C. – 2020. – Vol. 102. – P. 054611.B. M. A. Swinton-Bland et. al., Mass-asymmetric fission of 205,207,209Bi at energies close to the fission barrier using proton bombardment of 204,206,208Pb // Phys. Rev. C. – 2020. – Vol. 102. – P. 054611.K. Nomura et. al., Microscopic description of octupole collective excitations near N = 56 and N = 88 // Phys. Rev. C. – 2021. – Vol. 103. – P. 054301.K. Nomura et. al., Microscopic description of octupole collective excitations near N = 56 and N = 88 // Phys. Rev. C. – 2021. – Vol. 103. – P. 054301.A. Chatillon et. al., Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes // Phys. Rev. C. – 2022. – Vol. 106. – P. 024618.A. Chatillon et. al., Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes // Phys. Rev. C. – 2022. – Vol. 106. – P. 024618.Shivani Jain et. al., Investigation of octupole deformed fragments decaying from even-even isotopes of 222–230Th // Phys. Rev. C. – 2022. – Vol. 105. – P. 034605.Shivani Jain et. al., Investigation of octupole deformed fragments decaying from even-even isotopes of 222–230Th // Phys. Rev. C. – 2022. – Vol. 105. – P. 034605.A.N. Pan et al., Shell effects in the fission of 236U* nuclei, formed in the reaction 232Th(α,f) at incident alpha particle energy of 29 MeV // NNC RK Bulletin. – 2023. – Vol. 2. – P. 4–8. https://doi.org/10.52676/1729-7885-2023-2-4-8.A.N. Pan et al., Shell effects in the fission of 236U* nuclei, formed in the reaction 232Th(α,f) at incident alpha particle energy of 29 MeV // NNC RK Bulletin. – 2023. – Vol. 2. – P. 4–8. https://doi.org/10.52676/1729-7885-2023-2-4-8.E.M. Kozulin et al., Fission of 180,182,183Hg* and 178Pt* nuclei at intermediate excitation energies // Phys. Rev. C. – 2022. – Vol. 105. – P. 014607.E.M. Kozulin et al., Fission of 180,182,183Hg* and 178Pt* nuclei at intermediate excitation energies // Phys. Rev. C. – 2022. – Vol. 105. – P. 014607.A.A. Bogachev et al., Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions // Phys. Rev. C. – 2021. – Vol. 104. – P. 024623.A.A. Bogachev et al., Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions // Phys. Rev. C. – 2021. – Vol. 104. – P. 024623.T. Banerjee et al., Search for possible fission modes at high excitation energies in 254Fm // Phys. Rev. C. – 2022. – Vol. 105. – P. 044614.T. Banerjee et al., Search for possible fission modes at high excitation energies in 254Fm // Phys. Rev. C. – 2022. – Vol. 105. – P. 044614.

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