Abstract
Experiments aimed at synthesizing and investigating the features of radioactive decay of isotopes of superheavy elements (Z ≥ 110) have been conducted in the Flerov Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research. Complete fusion reactions of an accelerated beam of 48Ca ions with transactinide targets with the subsequent evaporation of several neutrons from excited compound nucleus are typically used in these experiments. “Exotic” reaction channels with the evaporation of protons and several neutrons may be used to produce more neutron-rich isotopes of superheavy elements. The production cross sections were measured in experiments at the SHELS separator for Db and Rf isotopes produced in xn and pxn channels of the 50Ti + 209Bi → 259Db* reaction. The ratio of cross sections σ(xn)/σ(pxn) was on the order of 100.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
A. V. Yeremin and A. G. Popeko, “Separation and identification of the products of complete fusion reactions: further development of methods (determination of heavy nuclei mass),” Phys. Part. Nucl. 35, 480 (2004).
S. Hofmann, “The discovery of elements Z 107 to 112,” EPJ WOC 131, 06001 (2016).
Yu. Ts. Oganessian and V. K. Utyonkov, “Superheavy nuclei from 48Ca-induced reactions,” Nucl. Phys. A 944, 62–98 (2015).
Yu. Ts. Oganessian et al., “Investigation of the 243Am + 48Ca reaction products previously observed in the experiments on elements 113, 115, and 117,” Phys. Rev. C 87, 014302 (2013).
A. N. Andreyev et al., “Decay widths of highly excited Ra compound nuclei,” Nucl. Phys. A 620, 229–248 (1997).
A. V. Karpov, A. S. Denikin, V. I. Zagrebaev, and A. P. Alekseev, Statistical Model Code of NRV. http://nrv.jinr.ru/.
V. A. Druin, Yu. B. Lobanov, R. N. Sagaidak, et al., in Proceedings of the International School-Seminar on Heavy Ions Physics (OIYaI, Alushta, 1983), p. 52.
A. V. Yeremin, A. G. Popeko, O. N. Malyshev, A. Lopez-Martens, K. Hauschild, O. Dorvaux, B. Gall, V. I. Chepigin, A. I. Svirikhin, A. V. Isaev, E. A. Sokol, M. L. Chelnokov, A. N. Kuznetsov, A. A. Kuznetsova, A. V. Belozerov, et al., “First experimental tests of the modernized VASSILISSA separator,” Phys. Part. Nucl. Lett. 12, 35 (2015).
A. V. Yeremin, A. G. Popeko, O. N. Malyshev, B. Gall, Z. Asfari, A. Lopez-Martens, K. Hauschild, O. Dorvaux, B. N. Gikal, S. L. Bogomolov, V. N. Loginov, A. E. Bondarchenko, V. I. Chepigin, A. I. Svirikhin, A. V. Isaev, et al., “Experimental tests of the modernized VASSILISSA separator (SHELS) with the use of accelerated 50Ti ions,” Phys. Part. Nucl. Lett. 12, 43 (2015).
K. Hauschild et al., “GABRIELA: a new detector array for gamma-ray and conversion electron spectroscopy of transfermium elements,” Nucl. Instrum. Methods Phys. Res., Sect. A 560, 388–394 (2006).
A. V. Yeremin et al., “Spectroscopy of transfermium elements at Dubna: results and plans,” in Proceedings of the 8th International Symposium on Exotic Nuclei EXON 2016, Kazan, Russia, Sept. 5–10, 2016, pp. 397–403.
A. N. Andreyev et al., “Large area high-efficiency time-of-flight system for detection of low energy heavy evaporation residues at electrostatic separator VASSILISSA,” Nucl. Instrum. Methods Phys. Res., Sect. A 364, 342–348 (1995).
F. P. Hessberger et al., “Decay properties of neutron-deficient isotopes 256,257Db, 255Rf, 252,253Lr,” Eur. Phys. J. A 12, 57–67 (2001).
F. P. Hessberger et al., “Spontaneous fission and alpha-decay properties of neutron deficient isotopes 257–253104 and 258106,” Z. Phys. A 359, 415–425 (1997).
A. I. Svirikhin et al., “Spontaneous fission of 256Rf, new data,” Phys. Part. Nucl. Lett. 13, 480–482 (2016).
L. P. Somerville et al., “Spontaneous fission of Rutherfordium isotopes,” Phys. Rev. C 31, 1801–1815 (1985).
J. M. Gates et al., “Synthesis of rutherfordium isotopes in the 238U(26Mg, xn)264-xRf reaction and study of their decay properties,” Phys. Rev. C 77, 034603 (2008).
F. P. Hessberger et al., “Investigation of electron capture decay of 258Db and α decay of 258Rf,” Eur. Phys. and J. A 52, 328 (2016).
J. Hong et al., “Ways to produce new superheavy isotopes with Z = 111–117 in charged particle evaporation channels,” Phys. Lett. B 764, 42–48 (2017).
ACKNOWLEDGMENTS
This study was supported financially by the Russian Foundation for Basic Research (project nos. 17-02-00867 and 18-52-15004) and the French National Research Agency (grant nos. ANR-06-BLAN-0034-01 and ANR-12-BS05-0013).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by D. Safin
Rights and permissions
About this article
Cite this article
Yeremin, A.V., Tezekbayeva, M.S., Popeko, A.G. et al. Measurement of the Production Cross Sections for Isotopes of Transfermium Elements in Complete Fusion Reactions with the Subsequent Evaporation of a Proton and Neutrons. Phys. Part. Nuclei Lett. 16, 224–228 (2019). https://doi.org/10.1134/S1547477119030099
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1547477119030099