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Gamma radiations from the bombardment of boron ten with protons and deuterons Chadwick, George Brierley


The gamma rays resulting from the bombardment of B¹⁰ with protons of energies from 0.5 to 2.0 Mev. have been observed with a sodium iodide scintillation counter. Capture radiation, of energy E[subscript γ] = 8.81 ± 0.05 + 10/11 E[subscript p] Mev., showed a broad resonance at E[subscript p] = 1135 ± 15 kev. At this energy, the radiation had an angular distribution of the form 1 + (0.5 ± 0.05)cos²θ and a total cross section (3.5 ± 1.0) × 10[power -30] cm². Several lower energy radiations were also observed and assigned tentatively to cascade transitions in en. The cross section for the 430 kev. radiation from the reaction B¹⁰ (p, αγ)Be⁷ was measured to be 0.21 ± 0.05 bn. at E[subscript p] = 1.52 Mev. This radiation was found to be isotropic. A three crystal scintillation counter pair spectometer has been constructed and used to observe the gamma radiations from the bombardment of B¹⁰ with deuterons of energies from 0.6 to 2.0 Mev. The spectrometer incorporated a selection of those pulses in the side counters representing 0.5 Mev. energy release before they entered a triple coincidence circuit, responding to coincidence between the three counters. The improved energy resolution and background rejection allowed the complex gamma ray spectra from B¹⁰ + d to be resolved and interpreted.

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