Phys. Rev. C 58, 3195–3204 (1998)Nucleon density of 172Yb and 176Yb at the nuclear periphery determined with antiprotonic x raysReceived 5 June 1998; published in the issue dated December 1998 The antiprotonic x-ray cascade in 172Yb and 176Yb was studied and the widths and shifts of the levels which are affected by the strong interaction were deduced. A large number of transitions up to Δn=5 could be observed. This opened the possibility to determine for the first time also the widths of noncircular orbits. In 172Yb and 176Yb four level shifts and seven level widths were measured in each case. The widths are slightly increasing from 172Yb to 176Yb whereas the shifts stay roughly constant. The experimental intensities of the transitions are compared with results from calculations of the antiproton cascade. Using a Fermi distribution for the nucleon densities the neutron diffuseness parameter was deduced to be for 172Yb (0.58±0.04) fm larger than the proton diffuseness parameter. For 176Yb this value is (0.71±0.04) fm. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.58.3195
DOI:
10.1103/PhysRevC.58.3195
PACS:
21.10.Gv, 13.75.Cs, 27.70.+q, 36.10.-k
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