Synthesis of rutherfordium isotopes in the U238(Mg26, xn)264xRf reaction and study of their decay properties

J. M. Gates, M. A. Garcia, K. E. Gregorich, Ch. E. Düllmann, I. Dragojević, J. Dvorak, R. Eichler, C. M. Folden, III, W. Loveland, S. L. Nelson, G. K. Pang, L. Stavsetra, R. Sudowe, A. Türler, and H. Nitsche
Phys. Rev. C 77, 034603 – Published 7 March 2008

Abstract

Isotopes of rutherfordium (Rf258261) were produced in irradiations of U238 targets with Mg26 beams. Excitation functions were measured for the 4n,5n, and 6n exit channels. Production of Rf261 in the 3n exit channel with a cross section of 2826+92 pb was observed. α-decay of Rf258 was observed for the first time with an α-particle energy of 9.05 ± 0.03 MeV and an α/total-decay branching ratio of 0.31 ± 0.11. In Rf259, the electron capture/total-decay branching ratio was measured to be 0.15±0.04. The measured half-lives for Rf258, Rf259, and Rf260 were 14.71.0+1.2 ms, 2.50.3+0.4 s, and 22.22.4+3.0 ms, respectively, in agreement with literature data. The systematics of the α-decay Q-values and of the partial spontaneous fission half-lives were evaluated for even-even nuclides in the region of the N=152,Z=100 deformed shell. The influence of the N=152 shell on the α-decay Q-values for rutherfordium was observed to be similar to that of the lighter elements (96Z102). However, the N=152 shell does not stabilize the rutherfordium isotopes against spontaneous fission, as it does in the lighter elements (96Z102).

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  • Received 10 December 2007

DOI:https://doi.org/10.1103/PhysRevC.77.034603

©2008 American Physical Society

Authors & Affiliations

J. M. Gates1,2, M. A. Garcia1,2, K. E. Gregorich1, Ch. E. Düllmann1,2,3, I. Dragojević1,2, J. Dvorak4,*, R. Eichler5,6, C. M. Folden, III1,2,†, W. Loveland7, S. L. Nelson1,2, G. K. Pang2,†, L. Stavsetra1, R. Sudowe1,‡, A. Türler4, and H. Nitsche1,2

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Chemistry, University of California, Berkeley, California 94720-1460, USA
  • 3Abteilung Kernchemie, Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
  • 4Institut für Radiochemie, Technische Universität München, D-85748 Garching, Germany
  • 5Labor für Radio- und Umweltchemie, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 6Departement für Chemie und Biochemie, Universität Bern, CH-3012 Bern, Switzerland
  • 7Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA

  • *Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA.
  • Present address: Department of Health Physics, University of Nevada, Las Vegas, NV 89154, USA.

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Vol. 77, Iss. 3 — March 2008

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