Neutron density distributions from antiprotonic Pb208 and Bi209 atoms

B. Kłos, A. Trzcińska, J. Jastrzębski, T. Czosnyka, M. Kisieliński, P. Lubiński, P. Napiorkowski, L. Pieńkowski, F. J. Hartmann, B. Ketzer, P. Ring, R. Schmidt, T. von Egidy, R. Smolańczuk, S. Wycech, K. Gulda, W. Kurcewicz, E. Widmann, and B. A. Brown
Phys. Rev. C 76, 014311 – Published 25 July 2007

Abstract

The x-ray cascade from antiprotonic atoms was studied for Pb208 and Bi209. Widths and shifts of the levels due to the strong interaction were determined. Using modern antiproton-nucleus optical potentials, the neutron densities in the nuclear periphery were deduced. Assuming two-parameter Fermi distributions (2pF) describing the proton and neutron densities, the neutron rms radii were deduced for both nuclei. The difference of neutron and proton rms radii Δrnp equal to 0.16±(0.02)stat±(0.04)syst fm for Pb208 and 0.14±(0.04)stat±(0.04)syst fm for Bi209 were determined, and the assigned systematic errors are discussed. The Δrnp values and the deduced shapes of the neutron distributions are compared with mean field model calculations.

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  • Received 26 February 2007

DOI:https://doi.org/10.1103/PhysRevC.76.014311

©2007 American Physical Society

Authors & Affiliations

B. Kłos

  • Physics Department, Silesian University, PL-40-007 Katowice, Poland

A. Trzcińska*, J. Jastrzębski, T. Czosnyka, M. Kisieliński, P. Lubiński, P. Napiorkowski, and L. Pieńkowski

  • Heavy Ion Laboratory, Warsaw University, PL-02-093 Warsaw, Poland

F. J. Hartmann, B. Ketzer, P. Ring, R. Schmidt, and T. von Egidy

  • Physik-Department, Technische Universität München, D-85748 Garching, Germany

R. Smolańczuk and S. Wycech

  • Sołtan Institute for Nuclear Studies, PL-00-681 Warsaw, Poland

K. Gulda and W. Kurcewicz

  • Institute of Experimental Physics, Warsaw University, PL-00-681 Warsaw, Poland

E. Widmann§

  • CERN, CH-1211 Geneva 23, Switzerland

B. A. Brown

  • Department of Physics and Astronomy, and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA

  • *agniecha@slcj.uw.edu.pl
  • Deceased.
  • Present address: N. Copernicus Astronomical Center, Pl-00-716 Warsaw, Poland.
  • §Present address: Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, A-1090 Vienna, Austria.

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Vol. 76, Iss. 1 — July 2007

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