Multipolarity of the 21, ground-state transition in Bi210 via multivariable angular correlation analysis

N. Cieplicka-Oryńczak, B. Szpak, S. Leoni, B. Fornal, D. Bazzacco, A. Blanc, G. Bocchi, S. Bottoni, G. de France, M. Jentschel, U. Köster, P. Mutti, G. Simpson, T. Soldner, C. Ur, and W. Urban
Phys. Rev. C 94, 014311 – Published 14 July 2016

Abstract

The multipolarity of the main transition leading to the ground state in Bi210 was investigated using the angular correlations of γ rays. The analyzed γ-coincidence data were obtained from the Bi209(n,γ)Bi210 experiment performed at Institut Laue-Langevin Grenoble at the PF1B cold-neutron facility. The EXILL (EXOGAM at the ILL) multidetector array, consisting of 16 high-purity germanium detectors, was used to detect γ transitions. The mixing ratio of the 320-keV γ ray was defined by minimizing a multivariable χΣ2 function constructed from the coefficients of angular correlation functions for seven pairs of strong transitions in Bi210. As a result, the almost pure M1 multipolarity of the 320-keV γ ray was obtained, with an E2 admixture of less than 0.6% only (95% confidence limit). Based on this multipolarity the neutron-capture cross section leading to the ground state in Bi210, that decays in turn to radiotoxic Po210, was determined to be within the limits 21.3(9) and 21.5(9) mb. This result is important for nuclear reactor applications.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 March 2016
  • Revised 23 May 2016

DOI:https://doi.org/10.1103/PhysRevC.94.014311

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

N. Cieplicka-Oryńczak1,2, B. Szpak2, S. Leoni1,3, B. Fornal2, D. Bazzacco4, A. Blanc5, G. Bocchi1,3, S. Bottoni1,3, G. de France6, M. Jentschel5, U. Köster5, P. Mutti5, G. Simpson7, T. Soldner5, C. Ur8, and W. Urban9

  • 1Istituto Nazionale di Fisica Nucleare Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
  • 2Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland
  • 3Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
  • 4Dipartimento di Fisica e Astronomia dell'Università and Istituto Nazionale di Fisica Nucleare Sezione di Padova, I-35131 Padova, Italy
  • 5Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
  • 6GANIL, Boulevard Becquerel, BP 55027, 14076 CAEN Cedex 05, France
  • 7LPSC, Université Joseph Fourier Grenoble 1, Centre National de la Recherche Scientifique/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
  • 8Istituto Nazionale di Fisica Nucleare Sezione di Padova, Via F. Marzolo 8, 35131 Padova, Italy
  • 9Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warszawa, Poland

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 94, Iss. 1 — July 2016

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×