Production and Decay of the Heaviest Nuclei 293,294117 and 294118

被引：225

作者：

Oganessian, Yu. Ts. ^{[1
]}

Abdullin, F. Sh. ^{[1
]}

Alexander, C. ^{[2
]}

Binder, J. ^{[2
]}

Boll, R. A. ^{[2
]}

Dmitriev, S. N. ^{[1
]}

Ezold, J. ^{[2
]}

Felker, K. ^{[2
]}

Gostic, J. M. ^{[3
]}

Grzywacz, R. K. ^{[2
,4
]}

Hamilton, J. H. ^{[5
]}

Henderson, R. A. ^{[3
]}

Itkis, M. G. ^{[1
]}

Miernik, K. ^{[2
]}

Miller, D. ^{[4
]}

Moody, K. J. ^{[3
]}

Polyakov, A. N. ^{[1
]}

Ramayya, A. V. ^{[5
]}

Roberto, J. B. ^{[2
]}

Ryabinin, M. A. ^{[6
]}

Rykaczewski, K. P. ^{[2
]}

Sagaidak, R. N. ^{[1
]}

Shaughnessy, D. A. ^{[3
]}

Shirokovsky, I. V. ^{[1
]}

Shumeiko, M. V. ^{[1
]}

Stoyer, M. A. ^{[3
]}

Stoyer, N. J. ^{[3
]}

Subbotin, V. G. ^{[1
]}

Sukhov, A. M. ^{[1
]}

Tsyganov, Yu. S. ^{[1
]}

Utyonkov, V. K. ^{[1
]}

Voinov, A. A. ^{[1
]}

Vostokin, G. K. ^{[1
]}

机构：

[1] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[4] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[5] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[6] Res Inst Atom Reactors, RU-433510 Dimitrovgrad, Russia

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

基金：

俄罗斯基础研究基金会;

关键词：

TABLES;

D O I：

10.1103/PhysRevLett.109.162501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Two years after the discovery of element 117, we undertook a second campaign using the Bk-249 + Ca-48 reaction for further investigations of the production and decay properties of the isotopes of element 117 on a larger number of events. The experiments were started in the end of April 2012 and are still under way. This Letter presents the results obtained in 1200 hours of an experimental run with the beam dose of Ca-48 of about 1.5 x 10(19) particles. The Bk-249 target was irradiated at two energies of Ca-48 that correspond to the maximum probability of the reaction channels with evaporation of three and four neutrons from the excited (297)117. In this experiment, two decay chains of (294)117 (3n) and five decay chains of (293)117 (4n) were detected. In the course of the long-term work, Cf-249-the product of decay of Bk-249 (330 d)-is being accumulated in the target. Consequently, in the present experiment, we also detected a single decay of the known isotope (294)118 that was produced during 2002-2005 in the reaction Cf-249(Ca-48, 3n)(294)118. The obtained results are compared with the data from previous experiments. The experiments are carried out in the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, using the heavy-ion cyclotron U400.

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