Ground-state and decay properties of neutron-rich Nb106

A. J. Mitchell, R. Orford, G. J. Lane, C. J. Lister, P. Copp, J. A. Clark, G. Savard, J. M. Allmond, A. D. Ayangeakaa, S. Bottoni, M. P. Carpenter, P. Chowdhury, D. A. Gorelov, R. V. F. Janssens, F. G. Kondev, U. Patel, D. Seweryniak, M. L. Smith, Y. Y. Zhong, and S. Zhu
Phys. Rev. C 103, 024323 – Published 24 February 2021

Abstract

The ground-state properties of neutron-rich Nb106 and its β decay into Mo106 have been studied using the CARIBU radioactive-ion-beam facility at Argonne National Laboratory. Niobium-106 ions were extracted from a Cf252 fission source and mass separated before being delivered as low-energy beams to the Canadian Penning Trap, as well as the X-Array and SATURN β-decay-spectroscopy station. The measured Nb106 ground-state mass excess of 66202.0(13) keV is consistent with a recent measurement but has three times better precision; this work also rules out the existence of a second long-lived, β-decaying state in Nb106 above 5 keV in excitation energy. The decay half-life of Nb106 was measured to be 1.097(21) s, which is 8% longer than the adopted value. The level scheme of the decay progeny, Mo106, has been expanded up to 4MeV. The distribution of decay strength and considerable population of excited states in Mo106 of J3 emphasizes the need to revise the adopted Jπ=1 ground-state spin-parity assignment of Nb106; it is more likely to be J3.

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  • Received 12 October 2020
  • Accepted 2 February 2021

DOI:https://doi.org/10.1103/PhysRevC.103.024323

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsAccelerators & Beams

Authors & Affiliations

A. J. Mitchell1,*, R. Orford2,3,†, G. J. Lane1, C. J. Lister4, P. Copp4,‡, J. A. Clark3, G. Savard3,5, J. M. Allmond6, A. D. Ayangeakaa7,8, S. Bottoni3,§, M. P. Carpenter3, P. Chowdhury4, D. A. Gorelov3,9, R. V. F. Janssens7,8, F. G. Kondev3, U. Patel1,∥, D. Seweryniak3, M. L. Smith1,¶, Y. Y. Zhong1, and S. Zhu3,#

  • 1Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
  • 2Department of Physics, McGill University, Montreal, Quebec, Canada H3A 2T8
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
  • 5Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 6Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
  • 7Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA
  • 8Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708-2308, USA
  • 9Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

  • *aj.mitchell@anu.edu.au
  • Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Present address: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • §Present address: Universita' degli Studi di Milano, Instituto Nazionale di Fisica Nucleare, Milano 20133, Italy.
  • Present address: Department of Physics, Duke University, Durham, North Carolina 27701, USA.
  • Present address: Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia.
  • #Present address: Brookhaven National Laboratory, Upton, New York 11973, USA.

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Issue

Vol. 103, Iss. 2 — February 2021

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