Elastic Electron Scattering on 4He at Energies between 30 and 59 Me VThe cross section of 4He for elastic electron scattering has been measured relative to that of the proton using a gas target with helium, hydrogen or a mixture of both gases, Scattering angles were between 56 ~ and 130 ~ , and the energy varied from 30 to 59 MeV. A model independent rms charge radius of (1.63 +_ 0.04) fm has been evaluated for the s-particle.
With the M6Bbauer technique the hyperfine splittings of the 67.4 keV transition of 61Ni in compounds and alloys have been studied. A magnetic moment P67,4 = + (0.477 _+ 0.031) Pn of the first excited state has been determined. From isomer shifts an order of magnitude estimate of the change in radius of fi(rZ)/(r2) -= --6-10 -4 can be inferred. The electric quadrupole interaction of the first excited level has been observed in Ni-J-boracite. In addition the hyperfine fields at the nickel sites were determined in the alloy series NixFel_x(0=
The hyperfine (hf) fields at the nickel sites were measured in the alloy series NixFe1−x (0≤x≤1) using the Mössbauer effect of 61Ni. The field at the 61Ni nucleus follows the relation Hhf = aμNi+bμ̄ with a≃ −20 kOe/μB and b≃−100 kOe/μB, μ̄ being the average magnetic moment of the alloy. This indicates that the conduction electron polarization produces the main contribution. In GdNi2 and ErNi2 intermetallic compounds the fields are less than 25 kOe as dededuced from linewidth.
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