Abstract
This study describes an experiment on investigating the properties of spontaneous fission of shortlived neutron-deficient nuclei synthesized in the reaction of complete fusion 48Ca + 204Pb = 252No*. The experiment is performed using the SHELS separator and the beam of multicharged ions at U-400 accelerator (LNR, JINR). Two activities undergoing spontaneous fission, which can be related to the ground and isomeric states of 250No nucleus, are registered. The half-lives, total kinetic energies of fission fragments, and neutron multiplicities are measured for the short-lived nuclei. The average number of neutrons per fission for the activity with t 1/2 = 5.1 ± 0.3 μs is = 4.38 ± 0.13 μs, and for nuclei with the half-life t 1/2 = 36 ± 3 μs it is xxxxx.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
D. C. Hoffman, “Spontaneous fission properties and life-time systematic,” Nucl. Phys. A 502, 21–40 (1989).
E. K. Hulet, “Role of the second barrier upon mass division in the spontaneous fission of the heaviest elements,” Phys. At. Nucl. 57, 1099 (1994).
A. S. Vorobyev, V. N. Dushin, F.-J. Hambsch, V. A. Jakovlev, V. A. Kalinin, A. B. Laptev, B. F. Petrov, and O. A. Shcherbakov, “Distribution of prompt neutron emission probability for fission fragments in spontaneous fission of 252Cf and 244, 248Cm,” in Proceedings of the International Conference On Nuclear Data for Science and Technology, Santa Fe, NM, USA, 2004, AIP Conf. Proc. 769, 613–616 (2005).
D. C. Hoffman, G. P. Ford, J. P. Balagna, and L. R. Veeser, “Neutron multiplicity measurements of Cf and Fm isotopes,” Phys. Rev. C 21, 637–646 (1980).
A. I. Svirikhin, V. N. Dushin, M. L. Chelnokov, V. I. Chepigin, I. N. Izosimov, D. E. Katrasev, O.N. Malyshev, A. Minkova, A. G. Popeko, E. A. Sokol, and A. V. Yeremin, “Neutron multiplicity at spontaneous fission of 246Fm,” Eur. Phys. J. A 44, 393–396 (2010).
A. I. Svirikhin, A. V. Andreev, V. N. Dushin, M. L. Chelnokov, V. I. Chepigin, M. Gupta, A. V. Isaev, I. N. Izosimov, D. E. Katrasev, A. N. Kuznetsov, O.N.Malyshev, S. Mullins, A. G. Popeko, E. A. Sokol, and A. V. Yeremin, “The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm,” Eur. Phys. J. A 48, 121–127 (2012).
A. I. Svirikhin, A. V. Yeremin, I. N. Izosimov, A. V. Isaev, A. N. Kuznetsov, O. N. Malyshev, A. G. Popeko, Yu. A. Popov, E. A. Sokol, M. L. Chelnokov, V. I. Chepigin, B. Andel, M. Z. Asfari, B. Gall, N. Yoshihiro, Z. Kalaninova et al., “Spontaneous fission of 256Rf, new data,” Phys. Part. Nucl. Lett. 13, 480 (2016).
A. V. Belozerov, M. L. Chelnokov, V. I. Chepigin, T. P.Drobina, V. A. Gorshkov, A. P. Kabachenko, O. N. Malyshev, I. M. Merkin, Yu. Ts. Oganessian, A. G. Popeko, R. N. Sagaidak, A. I. Svirikhin, A. V. Yeremin, G. Berek, I. Brida, and S. Saro, “Spontaneous-ission decay properties and production crosssections for the neutron-deficient nobelium isotopes formed in the 44,48Ca + 204,206,208Pb reactions,” Eur. Phys. J. A 16, 447–456 (2003).
D. Peterson, B. B. Back, R. V. F. Janssens, T. L. Khoo, C. J. Lister, D. Seweryniak, I. Ahmad, M. P. Carpenter, C. N. Davids, A. A. Hecht, C. L. Jiang, T. Lauritsen, X. Wang, and S. Zhu, “Decay modes of 250No,” Phys. Rev. C 74, 014316 (2006).
Yu. Ts. Oganessian, V. K. Utyonkov, Yu. V. Lobanov, F. Sh. Abdullin, A. N. Polyakov, I. V. Shirokovsky, Yu. S. Tsyganov, A. N. Mezentsev, S. Iliev, V. G. Subbotin, A. M. Sukhov, K. Subotic, O. V. Ivanov, A. N. Voinov, V. I. Zagrebaev, et al., “Measurements of cross sections for the fusion-evaporation reactions 204,206,207,208Pb + 48Ca and 207Pb + 34S: decay properties of the even-even nuclides 238Cf and 250No,” Phys. Rev. C 64, 054606 (2001).
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).
A. I. Svirikhin, A. V. Isaev, A. V. Yeremin, A. N. Kuznetsov, O. N. Malyshev, A. G. Popeko, E.A. Sokol, M. L. Chelnokov, V. I. Chepigin, “A detector for studying the characteristics of spontaneous fission of short-lived heavy nuclei,” Instrum. Exp. Tech. 54, 644 (2011).
C. E. Bemis, R. L. Ferguson, Jr., F. Plasil, R. J. Silva, F. Pleasontonv, and R. L. Hahn, “Fragment-mass and kinetic-energy distributions from the spontaneous fission of 252No,” Phys. Rev. C 15, 705–712 (1977).
F. R. Xu, E. G. Zhao, R. Wyss, and P. M. Walker, “Enhanced stability of superheavy nuclei due to highspin isomerism,” Phys. Rev. Lett. 92, 252501 (2004).
R.-D. Herzberg, P. T. Greenlees, P. A. Butler, G. D. Jones, M. Venhart, I. G. Darby, S. Eeckhaudt, K. Eskola, T. Grahn, C. Gray-Jones, F. P. Hessberger, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, et al., “Nuclear isomers in superheavy elements as stepping stones towards the island of stability,” Nature 442, 896–899 (2006).
F. P. Heßberger, S. Antalic, B. Sulignano, D. Ackermann, S. Heinz, S. Hofmann, J. Khuyagbaatar, I. Kojouharov, P. Kuusiniemi, M. Leino, B. Lommel, R. Mann, B. Kindler, K. Nishio, S. Saro, et al., “Decay studies of K-isomers in 254No,” Eur. Phys. J. A 43, 55–66 (2010).
G. G. Adamian, N. V. Antonenko, and W. Scheid, “High-spin isomers in some of the heaviest nuclei: spectra, decays, and population,” Phys. Rev. C 81, 024320 (2010).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.I. Svirikhin, A.V. Andreev, A.V. Yeremin, I.N. Izosimov, A.V. Isaev, A.N. Kuznetsov, A.A. Kuznetsova, O.N. Malyshev, A.G. Popeko, Y.A. Popov, E.A. Sokol, M.L. Chelnokov, V.I. Chepigin, T.M. Schneidman, B. Gall, O. Dorvaux, P. Brione, K. Hauschild, A. Lopez-Martenz, K. Rezynkina, S. Mullins, P. Jones, P. Mosat, 2017, published in Pis’ma v Zhurnal Fizika Elementarnykh Chastits i Atomnogo Yadra, 2017.
Rights and permissions
About this article
Cite this article
Svirikhin, A.I., Andreev, A.V., Yeremin, A.V. et al. Characteristics of spontaneous fission of 250No. Phys. Part. Nuclei Lett. 14, 571–575 (2017). https://doi.org/10.1134/S1547477117040161
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1547477117040161