We shall, in the present article, con6ne our attention mainly to electric and magnetic excitations produced by bombardment with nuclear particles. A brief review of the theory of inelastic electron scattering is given in Sec. IIE.3. ). "T.Huus and J. H. Bjerregaard, Phys. Rev. ' 92, 15'79 (1953).r4B. Elbek and C. K. Bockelman (submitted for publication). 5 Recently, Coulomb excitation studies have been made employing cyclotron accelerated nitrogen ions LAlkhazov, Andreyev, Greenberg, and Lemberg, Nuclear Phys. 2, 65 (1956)j.K. Alder and A. Winther, Phys. Rev. 96, 237 (1954). McHale, and Thaler, Phys. Rev. 101, 662 {1956),and 102, 1567. A WKB approximation which yields results in essential agreement with the detailed quantal treatment has beep given

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A sodium iodide scintillation spectrometer has been used to study the gamma radiation produced when B 10 is bombarded by protons. The following gamma rays have been found: a 432-kev gamma ray from the B 10 (^,a!y)Be 7 reaction, a 718-kev gamma ray from inelastic scattering in B 10 , and a high-energy gamma ray from the reaction B 10 (^,7)C n . Excitation curves and cross sections for these gamma rays are given. 9X10-/ / /

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NUCLIDES 599 own right. 11 The measured total cross section at 1.163A was 880b/molecule for the Sm 152 sample and 396b/ molecule for the Sm 154 sample.The diffraction peaks in both these samples were extremely weak due to the strong absorption, but rough values for the coherent cross sections were obtained. In Fig. 1 portions of the patterns obtained are illustrated. From a consideration of the relative intensities of the reflections shown, it can be deduced that Sm 152 has a negative scattering amplitude, and from the absolute intensities approximate cross sections were evaluated. No effort has been made to extract total scattering cross sections from the transmission data. ErErbium has six stable isotopes all of which except Er 167 (22.9 percent) are even-even nuclei. Bernstein et alP have measured the total cross section of Er in 11 Lapp, Van Horn, and Dempster, Phys. Rev. 71, 745 (1947). 12 Bernstein, Borst, Stanford, Stephenson, and Dial, Phys. Rev. 87, 487 (1952).