Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca

Yu Ts Oganesslan, A. V. Yeremln, A. G. Popeko, S. L. Bogomolov, G. V. Buklanov, M. L. Chelnokov, V. I. Cheplgin, B. N. Gikal, V. A. Gorshkov, G. G. Gulbekian, M. G. Itkls, A. P. Kabachenko, A. Yu Lavrentev, O. N. Malyshev, J. Rohac, R. N. Sagaidak, S. Hofmann, S. Saro, G. Glardina, Kosuke Morita

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Abstract

The stability of heavy nuclides, which tend to decay by α-emission and spontaneous fission, is determined by the structural properties of nuclear matter. Nuclear binding energies and lifetimes increase markedly in the vicinity of closed shells of neutrons or protons (nucleons), corresponding to 'magic' numbers of nucleons; these give rise to the most stable (spherical) nuclear shapes in the ground state. For example, with a proton number of Z = 82 and a neutron number of N = 126, the nucleus 208Pb is 'doubly-magic' and also exceptionally stable. The next closed neutron shell is expected at N 184, leading to the prediction of an 'island of stability' of superheavy nuclei, for a broad range of isotopes with Z = 104 to 120 (refs 1, 2). The heaviest known nuclei have lifetimes of less than a millisecond, but nuclei near the top of the island of stability are predicted to exist for many years. (In contrast, nuclear matter consisting of about 300 nucleons with no shell structure would undergo fission within about 10-20 seconds.) Calculations indicate that nuclei with N > 168 should already benefit from the stabilizing influence of the closed shell at N = 184. Here we report the synthesis of an isotope containing 114 protons and 173 neutrons, through fusion of intense beams of 48Ca ions with 242Pu targets. The isotope decays by α-emission with a half-life of about five seconds, providing experimental confirmation of the island of stability.

Original languageEnglish
Pages (from-to)242-245
Number of pages4
JournalNature
Volume400
Issue number6741
DOIs
Publication statusPublished - Jul 15 1999
Externally publishedYes

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nucleons
neutrons
nuclei
isotopes
synthesis
fission
protons
nuclear binding energy
life (durability)
decay
heavy nuclei
nuclides
half life
fusion
ground state
predictions
ions

All Science Journal Classification (ASJC) codes

  • General

Cite this

Oganesslan, Y. T., Yeremln, A. V., Popeko, A. G., Bogomolov, S. L., Buklanov, G. V., Chelnokov, M. L., ... Morita, K. (1999). Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca. Nature, 400(6741), 242-245. https://doi.org/10.1038/22281

Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca. / Oganesslan, Yu Ts; Yeremln, A. V.; Popeko, A. G.; Bogomolov, S. L.; Buklanov, G. V.; Chelnokov, M. L.; Cheplgin, V. I.; Gikal, B. N.; Gorshkov, V. A.; Gulbekian, G. G.; Itkls, M. G.; Kabachenko, A. P.; Lavrentev, A. Yu; Malyshev, O. N.; Rohac, J.; Sagaidak, R. N.; Hofmann, S.; Saro, S.; Glardina, G.; Morita, Kosuke.

In: Nature, Vol. 400, No. 6741, 15.07.1999, p. 242-245.

Research output: Contribution to journalArticle

Oganesslan, YT, Yeremln, AV, Popeko, AG, Bogomolov, SL, Buklanov, GV, Chelnokov, ML, Cheplgin, VI, Gikal, BN, Gorshkov, VA, Gulbekian, GG, Itkls, MG, Kabachenko, AP, Lavrentev, AY, Malyshev, ON, Rohac, J, Sagaidak, RN, Hofmann, S, Saro, S, Glardina, G & Morita, K 1999, 'Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca', Nature, vol. 400, no. 6741, pp. 242-245. https://doi.org/10.1038/22281
Oganesslan YT, Yeremln AV, Popeko AG, Bogomolov SL, Buklanov GV, Chelnokov ML et al. Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca. Nature. 1999 Jul 15;400(6741):242-245. https://doi.org/10.1038/22281
Oganesslan, Yu Ts ; Yeremln, A. V. ; Popeko, A. G. ; Bogomolov, S. L. ; Buklanov, G. V. ; Chelnokov, M. L. ; Cheplgin, V. I. ; Gikal, B. N. ; Gorshkov, V. A. ; Gulbekian, G. G. ; Itkls, M. G. ; Kabachenko, A. P. ; Lavrentev, A. Yu ; Malyshev, O. N. ; Rohac, J. ; Sagaidak, R. N. ; Hofmann, S. ; Saro, S. ; Glardina, G. ; Morita, Kosuke. / Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca. In: Nature. 1999 ; Vol. 400, No. 6741. pp. 242-245.
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abstract = "The stability of heavy nuclides, which tend to decay by α-emission and spontaneous fission, is determined by the structural properties of nuclear matter. Nuclear binding energies and lifetimes increase markedly in the vicinity of closed shells of neutrons or protons (nucleons), corresponding to 'magic' numbers of nucleons; these give rise to the most stable (spherical) nuclear shapes in the ground state. For example, with a proton number of Z = 82 and a neutron number of N = 126, the nucleus 208Pb is 'doubly-magic' and also exceptionally stable. The next closed neutron shell is expected at N 184, leading to the prediction of an 'island of stability' of superheavy nuclei, for a broad range of isotopes with Z = 104 to 120 (refs 1, 2). The heaviest known nuclei have lifetimes of less than a millisecond, but nuclei near the top of the island of stability are predicted to exist for many years. (In contrast, nuclear matter consisting of about 300 nucleons with no shell structure would undergo fission within about 10-20 seconds.) Calculations indicate that nuclei with N > 168 should already benefit from the stabilizing influence of the closed shell at N = 184. Here we report the synthesis of an isotope containing 114 protons and 173 neutrons, through fusion of intense beams of 48Ca ions with 242Pu targets. The isotope decays by α-emission with a half-life of about five seconds, providing experimental confirmation of the island of stability.",
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AU - Oganesslan, Yu Ts

AU - Yeremln, A. V.

AU - Popeko, A. G.

AU - Bogomolov, S. L.

AU - Buklanov, G. V.

AU - Chelnokov, M. L.

AU - Cheplgin, V. I.

AU - Gikal, B. N.

AU - Gorshkov, V. A.

AU - Gulbekian, G. G.

AU - Itkls, M. G.

AU - Kabachenko, A. P.

AU - Lavrentev, A. Yu

AU - Malyshev, O. N.

AU - Rohac, J.

AU - Sagaidak, R. N.

AU - Hofmann, S.

AU - Saro, S.

AU - Glardina, G.

AU - Morita, Kosuke

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