In-beam spectroscopy of 215Rn86

M. E. Debray, M. Davidson, J. Davidson, A. J. Kreiner, M. A. Cardona, D. Hojman, D. R. Napoli, S. Lenzi, G. de Angelis, M. De Poli, A. Gadea, D. Bazzacco, C. Rossi-Alvarez, N. Medina, and C. A. Ur
Phys. Rev. C 86, 014326 – Published 20 July 2012

Abstract

The yrast level structure of 215Rn has been studied by means of in-beam spectroscopy α-γ-γ coincidence techniques through the 207Pb(18O,2α2n) reaction at 93 MeV bombarding energy, using the 8π GASP-ISIS spectrometer at Legnaro. New spectroscopic information has been obtained. The deduced low-lying level scheme of 215Rn does not exhibit the alternating parity structure observed in the heavier known isotones 216Fr, 217Ra, 218Ac, and 219Th. From this result, the lightest nucleus showing evidence for octupole collectivity is 216Fr, defining the lowest-mass corner for this kind of phenomenon as N129 and Z87.

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  • Received 29 July 2011

DOI:https://doi.org/10.1103/PhysRevC.86.014326

©2012 American Physical Society

Authors & Affiliations

M. E. Debray1,2, M. Davidson3, J. Davidson3, A. J. Kreiner1,2,3, M. A. Cardona1,2,3, D. Hojman1,3, D. R. Napoli4, S. Lenzi5, G. de Angelis4, M. De Poli4, A. Gadea4, D. Bazzacco5, C. Rossi-Alvarez5, N. Medina6, and C. A. Ur5

  • 1Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
  • 2Escuela de Ciencia y Tecnología, Universidad de San Martín, San Martín, Argentina
  • 3CONICET, 1033 Buenos Aires, Argentina
  • 4INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy
  • 5Dipartimento di Fisica, Sezione di Padova, Padova, Italy
  • 6Departamento de Fisica Nuclear, Universidade de Saõ Paulo, Brazil

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Vol. 86, Iss. 1 — July 2012

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