First experiment at the Super Heavy Element Factory: new data from the  243 Am +  48 Ca reaction

N. D. Kovrizhnykh; Коврижных Н. Д.; Yu. Ts. Oganessian; Оганесян Ю. Ц.; V. K. Utyonkov; Утенков В. К.; F. Sh. Abdullin; Абдуллин Ф. Ш.; S. N. Dmitriev; Дмитриев С. Н.; A. A. Dzhioev; Джиоев А. А.; D. Ibadullayev; Ибадуллаев Д.; M. G. Itkis; Иткис М. Г.; A. V. Karpov; Карпов А. В.; D. A. Kuznetsov; Кузнецов Д. А.; O. V. Petrushkin; Петрушкин О. В.; A. V. Podshibiakin; Подшибякин А. В.; A. N. Polyakov; Поляков А. Н.; A. G. Popeko; Попеко А. Г.; I. S. Rogov; Рогов И. С.; R. N. Sagaidak; Сагайдак Р. Н.; L. Schlattauer; Шлаттауэр Л.; V. D. Shubin; Шубин В. Д.; M. V. Shumeiko; Шумейко М. В.; D. I. Solovyev; Соловьев Д. И.; Yu. S. Tsyganov; Цыганов Ю. С.; A. A. Voinov; Воинов А. А.; V. G. Subbotin; Субботин В. Г.; A. Yu. Bodrov; Бодров А. Ю.; A. V. Sabel’nikov; Сабельников А. В.; A. V. Khalkin; Халкин А. В.

doi:10.31857/S0367676523701946

First experiment at the Super Heavy Element Factory: new data from the ²⁴³Am + ⁴⁸Ca reaction

Authors: Kovrizhnykh N.D.¹, Oganessian Y.T.¹, Utyonkov V.K.¹, Abdullin F.S.¹, Dmitriev S.N.¹, Dzhioev A.A.¹, Ibadullayev D.¹^,2^,3, Itkis M.G.¹, Karpov A.V.¹, Kuznetsov D.A.¹, Petrushkin O.V.¹, Podshibiakin A.V.¹, Polyakov A.N.¹, Popeko A.G.¹, Rogov I.S.¹, Sagaidak R.N.¹, Schlattauer L.⁴, Shubin V.D.¹, Shumeiko M.V.¹, Solovyev D.I.¹, Tsyganov Y.S.¹, Voinov A.A.¹, Subbotin V.G.¹, Bodrov A.Y.¹^,5, Sabel’nikov A.V.¹, Khalkin A.V.¹
Affiliations:
1. Joint Institute for Nuclear Research
2. Institute of Nuclear Physics
3. Gumilyov Eurasian National University
4. Palacky University Olomouc, Department of Experimental Physics, Faculty of Science
5. Lomonosov Moscow State University, Department of Chemistry
Issue: Vol 87, No 8 (2023)
Pages: 1077-1083
Section: Articles
URL: https://journals.rcsi.science/0367-6765/article/view/135452
DOI: https://doi.org/10.31857/S0367676523701946
EDN: https://elibrary.ru/ZAXALX
ID: 135452

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Abstract

We presented the results of the series of experiments on the synthesis of Mc isotopes in the ²⁴³Am + ⁴⁸Ca reaction performed at the new separator DGFRS-2 and cyclotron DC280 of the SHE Factory at FLNR JINR. There were registered 110 new ²⁸⁸Mc decay chains, 10 ²⁸⁹Mc chains, and 4 ²⁸⁷Mc chains. Alpha decay of ²⁶⁸Db with an energy of 7.6–8.0 MeV, half-life \(16_{{ - 4}}^{{ + 6}}\) h and α-branch \(51_{{ - 12}}^{{ + 14}}\% \) was registered for the first time together with a new spontaneously fissioning isotope ²⁶⁴Lr with a half-life of \(4.8_{{ - 1.3}}^{{ + 2.2}}\,\,{\text{h}}.\) The measured cross section of the ²⁴³Am(⁴⁸Ca, 3n)²⁸⁸Mc reaction was \(17.1_{{ - 4.7}}^{{ + 6.3}}\) pb, which is the largest for known superheavy nuclei. A new isotope ²⁸⁶Mc was synthesized with a half-life of \(20_{{ - 9}}^{{ + 98}}\) ms and an α-particle energy of 10.71 ± 0.02 MeV. Spontaneous fission of ²⁷⁹Rg was first observed in one of the four new decay chains of ²⁸⁷Mc. The reaction excitation function was measured at six ⁴⁸Ca energies in the range of 239–259 MeV, which led to the first observation of the 5n channel with a cross section of \(0.5_{{ - 0.4}}^{{ + 1.3}}\) pb. The decay properties of 20 previously known isotopes have been determined with higher accuracy.

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First experiment at the Super Heavy Element Factory: new data from the 243Am + 48Ca reaction

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First experiment at the Super Heavy Element Factory: new data from the ²⁴³Am + ⁴⁸Ca reaction