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Synthesis of superheavy nuclei in the 48Ca+244Pu reaction: 288114

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Title:
Synthesis of superheavy nuclei in the 48Ca+244Pu reaction: 288114 Authors:
Oganessian, Yu. Ts.; Utyonkov, V. K.; Lobanov, Yu. V.; Abdullin, F. Sh.; Polyakov, A. N.; Shirokovsky, I. V.; Tsyganov, Yu. S.; Gulbekian, G. G.; Bogomolov, S. L.; Gikal, B. N.; Mezentsev, A. N.; Iliev, S.; Subbotin, V. G.; Sukhov, A. M.; Ivanov, O. V.; Buklanov, G. V.; Subotic, K.; Itkis, M. G.; Moody, K. J.; Wild, J. F.; Stoyer, N. J.; Stoyer, M. A.; Lougheed, R. W. Affiliation:
AA(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AB(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AC(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AD(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AE(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AF(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AG(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AH(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AI(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AJ(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AK(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AL(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AM(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AN(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AO(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AP(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AQ(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AR(Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation), AS(University of California, Lawrence Livermore National Laboratory, Livermore, California 94551), AT(University of California, Lawrence Livermore National Laboratory, Livermore, California 94551), AU(University of California, Lawrence Livermore National Laboratory, Livermore, California 94551), AV(University of California, Lawrence Livermore National Laboratory, Livermore, California 94551), AW(University of California, Lawrence Livermore National Laboratory, Livermore, California 94551) Publication:
Physical Review C (Nuclear Physics), Volume 62, Issue 4, October 2000, id.041604 (PhRvC Homepage) Publication Date:
10/2000 Origin:
APS PACS Keywords:
Compound nucleus, Alpha decay, Spontaneous fission, 220&lt, =A DOI:
10.1103/PhysRevC.62.041604 Bibliographic Code:
2000PhRvC..62d1604O

Abstract

In the bombardment of a 244Pu target with 48Ca ions, we observed two identical decay sequences of genetically linked events, each consisting of an implanted heavy atom, two subsequent alpha decays, and terminated by a spontaneous fission. The measured alpha energies and corresponding half-lives of the sequential chain members were Ealpha=9.84+/-0.05 MeV (T1/2=1.9+3.3-0.8 s) and 9.17+/-0.05 MeV (T1/2=9.8+18-3.8 s) for the spontaneous fission (T1/2=7.5+14-2.9 s), the total energies deposited in the detector array were 213+/-2 and 221+/-2 MeV. The decay properties of the synthesized nuclei are consistent with the consecutive alpha decays originating from the parent even-even nucleus 288114, produced in the 4n-evaporation channel with a cross section of about 1 pb. 288114 and 284112 are the heaviest known alpha-decaying even-even nuclides, following the production of 260Sg and 266Sg (Z=106) and the observation of alpha decay of 264Hs (Z=108). The observed radioactive properties of 288114 and the daughter nuclides match the decay scenario predicted by the macroscopic-microscopic theory.
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