Neutron density distributions from antiprotonic 208Pb and 209Bi atoms

Klos, B.; Pienkowski, L.; Trzcinska, A.; Kurcewicz, W.; Schmidt, R.; Hartmann, F.J.; Jastrzebski, J.; Ketzer, B.; Czosnyka, T.; Brown, B.Alex; Napiorkowski, P.; Gulda, K.; Smolanczuk, R.; von Egidy, T.; Wycech, S.; Lubinski, P.; Ring, P.; Kisielinski, M.; Widmann, E.

doi:10.1103/PhysRevC.76.014311

Article
Report number	nucl-ex/0702016
Title	Neutron density distributions from antiprotonic 208Pb and 209Bi atoms
Related title	ANTI-PROTONIC
Author(s)	Klos, B. (Silesia U.) ; Trzcinska, A. (Warsaw U., Heavy Ion Lab) ; Jastrzebski, J. (Warsaw U., Heavy Ion Lab) ; Czosnyka, T. (Warsaw U., Heavy Ion Lab) ; Kisielinski, M. (Warsaw U., Heavy Ion Lab) ; Lubinski, P. (Warsaw U., Heavy Ion Lab) ; Napiorkowski, P. (Warsaw U., Heavy Ion Lab) ; Pienkowski, L. (Warsaw U., Heavy Ion Lab) ; Hartmann, F.J. (Munich, Tech. U.) ; Ketzer, B. (Munich, Tech. U.) ; Ring, P. (Munich, Tech. U.) ; Schmidt, R. (Munich, Tech. U.) ; von Egidy, T. (Munich, Tech. U.) ; Smolanczuk, R. (Warsaw, Inst. Nucl. Studies) ; Wycech, S. (Warsaw, Inst. Nucl. Studies) ; Gulda, K. (Warsaw U.) ; Kurcewicz, W. (Warsaw U.) ; Widmann, E. (CERN) ; Brown, B.Alex (Michigan State U., NSCL ; Michigan State U.)
Affiliation	(Heavy Ion Laboratory, Warsaw University, Poland) ; (Physik-Department, Technische Universitat Munchen,Germany) ; (Sołtan Institute for Nuclear Studies, Poland) ; (Institute of Experimental Physics, Warsaw University, Poland) ; (CERN)
Publication	2007
Imprint	8 Feb 2007
Number of pages	22
In:	Phys. Rev. C 76 (2007) 014311
DOI	10.1103/PhysRevC.76.014311
Subject category	Nuclear Physics - Experiment
Abstract	The X-ray cascade from antiprotonic atoms was studied for 208Pb and 209Bi. 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 /\r_np equal to 0.16 +-(0.02)_{stat} +- (0.04)_{syst} fm for 208Pb and 0.14 +- (0.04)_{stat} +- (0.04)_{syst} fm for 209Bi were determined and the assigned systematic errors are discussed. The /\r_np values and the deduced shapes of the neutron distributions are compared with mean field model calculations.