A. Trzcińska

Information on antiprotonic atoms and the nuclear periphery from the PS209 experiment

A. Trzcińska, J. Jastrzȩbski, T. Czosnyka, T. von Egidy, K. Gulda, F. J. Hartmann, J. Iwanicki, B. Ketzer, M. Kisieliński, B. K los, W. Kurcewicz P. Lubiński, P. J. Napiorkowski, L. Pieńkowski, R. Schmidt, E. Widmann Heavy Ion Laboratory, Warsaw University, PL-02-093 Warsaw, Poland Physik-Department, Technische Universität München, D-85747 Garching, Germany Institute of Experimental Physics, Warsaw University, PL-00-681, Warsaw, Poland Institute of Physics, University of Silesia, PL-40-007 Katowice, Poland CERN, CH-1211 Geneva 23, Switzerland

Neutron density distributions from antiprotonic Pb 208 and Bi 209 atoms

The x-ray cascade from antiprotonic atoms was studied for 208 Pb and 209 Bi. Widths and shifts of the levels due to the strong interaction were determined. Using modem 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 Δr nP equal to 0.16 ± (0.02) stat ± (0.04) syst fm for 208 Pb and 0.14 ± (0.04) stat ± (0.04) syst fm for 209 Bi were determined, and the assigned systematic errors are discussed. The Δr nP values and the deduced shapes of the neutron distributions are compared with mean field model calculations.

Nucleon density in the nuclear periphery determined with antiprotonic x rays: Cadmium and tin isotopes

The x-ray cascade from antiprotonic atoms was studied for 106Cd, 116Cd, 112Sn, 116Sn, 120Sn, and 124Sn. Widths and shifts of the levels due to strong interaction were deduced. Isotopic effects in the Cd and Sn isotopes are clearly seen. The results are used to investigate the nucleon density in the nuclear periphery. The deduced neutron distributions are compared with the results of the previously introduced radiochemical method and with HFB calculations.

Production of medical Sc radioisotopes with an alpha particle beam

The internal α-particle beam of the Warsaw Heavy Ion Cyclotron was used to produce research quantities of the medically interesting Sc radioisotopes from natural Ca and K and isotopically enriched 42Ca targets. The targets were made of metallic calcium, calcium carbonate and potassium chloride. New data on the production yields and impurities generated during the target irradiations are presented for the positron emitters 43Sc, 44gSc and 44mSc. The different paths for the production of the long lived 44mSc/44gSc in vivo generator, proposed by the ARRONAX team, using proton and deuteron beams as well as alpha-particle beams are discussed. Due to the larger angular momentum transfer in the formation of the compound nucleus in the case of the alpha particle induced reactions, the isomeric ratio of 44mSc/44gSc at a bombarding energy of 29MeV is five times larger than previously determined for a deuteron beam and twenty times larger than for proton induced reactions on enriched CaCO3 targets. Therefore, formation of this generator via the alpha-particle route seems a very attractive way to form these isotopes. The experimental data presented here are compared with theoretical predictions made using the EMPIRE evaporation code. Reasonable agreement is generally observed.

Nuclear surface studies with antiprotonic atom X-rays

The recent and older level shifts and widths in

Antiprotonic investigation of the nuclear periphery

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Gold fragmentation induced by stopped antiprotons

atoms are analyzed. The results are fitted by an antiproton-nucleus optical potential with two basic complex strength parameters. These parameters are related to average

Nuclear interactions of antiprotons: theory

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Targets for production of the medical radioisotopes with alpha and proton or deuteron beams

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Production of medium‐mass neutron‐rich nuclei in 238U fission

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