β-delayed-neutron studies of Sb135,136 and I140 performed with trapped ions

B. S. Wang, S. A. Caldwell, N. D. Scielzo, A. Czeszumska, J. A. Clark, G. Savard, A. Aprahamian, M. T. Burkey, C. J. Chiara, J. Harker, A. F. Levand, S. T. Marley, G. E. Morgan, J. M. Munson, E. B. Norman, A. Nystrom, R. Orford, S. W. Padgett, A. Pérez Galván, K. S. Sharma, K. Siegl, and S. Y. Strauss
Phys. Rev. C 101, 025806 – Published 24 February 2020

Abstract

Beta-delayed-neutron (βn) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The βn branching ratios and energy spectra for Sb135,136 and I140 were obtained by measuring the time of flight of recoil ions emerging from the trapped ion cloud. These nuclei are located at the edge of an isotopic region identified as having βn branching ratios that impact the r-process abundance pattern around the A130 peak. For Sb135,136 and I140, βn branching ratios of 14.6(13)%, 17.6(29)%, and 7.6(28)% were determined, respectively. The βn energy spectra obtained for Sb135 and I140 are compared with results from direct neutron measurements, and the βn energy spectrum for Sb136 has been measured for the first time.

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  • Received 13 March 2019
  • Revised 13 December 2019
  • Accepted 27 January 2020

DOI:https://doi.org/10.1103/PhysRevC.101.025806

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

B. S. Wang1,2,*, S. A. Caldwell3,4,†, N. D. Scielzo1, A. Czeszumska1,2,‡, J. A. Clark4, G. Savard4,3, A. Aprahamian5, M. T. Burkey1,4, C. J. Chiara4,6,§, J. Harker4,6, A. F. Levand4, S. T. Marley7,5, G. E. Morgan8,4, J. M. Munson2, E. B. Norman2, A. Nystrom5,4, R. Orford9,4, S. W. Padgett1, A. Pérez Galván4,∥, K. S. Sharma8, K. Siegl5, and S. Y. Strauss5

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 2Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
  • 3Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 4Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 5Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 6Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 7Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 8Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
  • 9Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada

  • *alan2@llnl.gov
  • Present address: Rigetti Computing, Berkeley, California 94710, USA.
  • Present address: Mittemitte GmbH, 12047 Berlin, Germany.
  • §Present address: U.S. Army Research Laboratory, Adelphi, Maryland 20783, USA.
  • Present address: Vertex Pharmaceuticals, San Diego, California 92121, USA.

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Issue

Vol. 101, Iss. 2 — February 2020

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