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Claes Fahlander

Professor emeritus

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Decay Spectroscopy of Element 115 Daughters: 280Rg -> 276Mt and 276Mt -> 272Bh

Author

  • J. M. Gates
  • K. E. Gregorich
  • O. R. Gothe
  • E. C. Uribe
  • G. K. Pang
  • D. L. Bleuel
  • M. Block
  • R. M. Clark
  • C. M. Campbell
  • H. L. Crawford
  • M. Cromaz
  • A. Di Nitto
  • Ch. E. Düllmann
  • N. E. Esker
  • Claes Fahlander
  • P. Fallon
  • R. M. Farjadi
  • Ulrika Forsberg
  • J. Khuyagbaatar
  • W. Loveland
  • A. O. Macchiavelli
  • E. M. May
  • P. R. Mudder
  • D. T. Olive
  • A. C. Rice
  • J. Rissanen
  • Dirk Rudolph
  • Luis Sarmiento
  • J. A. Shusterman
  • M. A. Stoyer
  • A. Wiens
  • A. Yakushev
  • H. Nitsche
Show all

Summary, in English

Forty-six decay chains, assigned to the decay of 288-115, were produced using the 243Am(48Ca,3n)288-115 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be 280Rg and 276Mt, respectively). Upon combining these data with those from 22 288-115 decay chains observed in a similar experiment, updated level schemes in 276Mt and 272Bh (populated by the α decay of 280Rg and 276Mt, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both 280Rg and 276Mt. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.

Department/s

  • Nuclear physics

Publishing year

2015

Language

English

Publication/Series

Physical Review C (Nuclear Physics)

Volume

92

Issue

2

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • alpha decay
  • superheavy elements
  • element 115
  • gamma-ray spectroscopy

Status

Published

Project

  • Nuclear Structure at the Limits: Isotope-selective Spectroscopy

Research group

  • Nuclear Structure

ISBN/ISSN/Other

  • ISSN: 0556-2813