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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 64: Radii, Masses, Heavy Nuclei

HK 64.1: Group Report

Thursday, March 19, 1998, 14:00–14:30, E

Determination of the proton and neutron densities at the nuclear periphery with p X-rays and p–nucleus reactions — •R. Schmidt1, T. Czosnyka2, T. von Egidy1, K. Gulda3, F.J. Hartmann1, J. Jastrzȩbski2, B. Ketzer1, B. Kłos4, J. Kulpa5, W. Kurcewicz3, P. Lubiński2, P. Napiorkowski2, L. Pieńkowski2, R. Smolańczuk5, A. Trzcińska2, E. Widmann6, and S. Wycech51Physik-Department, TU M"unchen — 2Heavy Ion Laboratory, Warsaw University — 3Institute of Experimental Physics, Warsaw University — 4Physics Department, Silesian University, Katowice — 5Soltan Institute for Nuclear Studies, Warschau — 6CERN, Genf

The nucleon density at the nuclear periphery has been investigated with two different methods. The first one is the measurement of the energy shift and the width of antiprotonic X-ray lines. Besides various other nuclids the X-rays of the isotopes 172Yb and 176Yb have been measured very extensively. From these data the absorption widths of six antiprotonic levels and the shifts of the lowest visible transitions could be determined.
The second method is the determination of the yield of the annihilation products from the reaction of the antiprotons with nuclei. From the yield of the products with one neutron or one proton less than the target nucleus the neutron–to–proton density ratio at a distance of 3 fm from the nuclear surface can be determined [1]. This method was extended to short–lived product nuclei with a half–live down to 5 s. This allowed to measure the ratio for the nuclei 48Ca, 100Mo, 104Ru, 116Cd, 112Sn, and 124Sn. The results have been compared with the results of HFB–calculations.

[1] P. Lubiński, et al., Phys. Rev. Lett. 73, 3199 (1994)

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