Neutron density distributions from antiprotonic 208Pb and 209Bi atoms

被引：123
|
作者：
Klos, B. [1 ]
Trzcinska, A.
Jastrzebski, J.
Czosnyka, T.
Kisielinski, M.
Lubinski, P.
Napiorkowski, P.
Pienkowski, L.
Hartmann, F. J.
Ketzer, B.
Ring, P.
Schmidt, R.
von Egidy, T.
Smolanczuk, R.
Wycech, S.
Gulda, K.
Kurcewicz, W.
Widmann, E.
Brown, B. A.
机构：
[1] Silesian Univ, Dept Phys, PL-40007 Katowice, Poland
[2] Warsaw Univ, Heavy Ion Lab, PL-02093 Warsaw, Poland
[3] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[4] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
[5] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
[6] CERN, CH-1211 Geneva 23, Switzerland
[7] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[8] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
来源：
PHYSICAL REVIEW C | 2007年 / 76卷 / 01期
关键词：
D O I：
10.1103/PhysRevC.76.014311
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The x-ray cascade from antiprotonic atoms was studied for Pb-208 and Bi-209. 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 Delta r(np) equal to 0.16 +/-(0.02)(stat)+/-(0.04)(syst) fm for Pb-208 and 0.14 +/-(0.04)(stat)+/-(0.04)(syst) fm for Bi-209 were determined, and the assigned systematic errors are discussed. The Delta r(np) values and the deduced shapes of the neutron distributions are compared with mean field model calculations.
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页数：13
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