Fowler, W. A. and Gaerttner, E. R. and Lauritsen, C. C. (1938) The Gamma-Radiation from Boron Bombarded by Protons. Physical Review, 53 (8). pp. 628-636. ISSN 0031-899X http://resolver.caltech.edu/CaltechAUTHORS:FOWpr38a
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Employing a Wilson cloud chamber we have determined the distribution in energy of pairs and recoil electrons ejected from lead and carbon laminae by the gamma-radiation from boron bombarded by protons. Both the pair and electron distributions indicate three prominent gamma-ray components at 4.3±0.3 Mev, 11.8±0.5 Mev, and 16.6±0.6 Mev with relative intensities of 1: 1: 1/7, respectively. The radiation is believed to result from proton capture by B11 to form an excited state of C12 which radiates in a single transition to the ground state or in a double transition through the well-known intermediate state at 4.3 Mev. Resonance in the yield has been found only in the region 150→200 kv and the total yield of quanta per incident proton above resonance on a thick boron target is estimated to be ≥5×10^-10.
|Additional Information:||©1938 The American Physical Society Received 28 January 1938|
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|Deposited On:||30 Jan 2006|
|Last Modified:||26 Dec 2012 08:44|
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