Experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉

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This article discusses experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉.

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4 p.

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Zhao, Z. Y.; Arrale, A. M.; Li, S. L.; Marble, D. K.; Weathers, Duncan L.; Matteson, Samuel E. et al. April 1998.

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This article discusses experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉.

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4 p.

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Copyright 1998 American Physical Society. The following article appeared in Physical Review A, 57:4, http://link.aps.org/doi/10.1103/PhysRevA.57.2742

Abstract: The present work reports the experimental evidence of anomalies exhibited by the energy loss and energy straggling of channeled protons in silicon in transmission measurements versus the incident angle. Results are presented for 1.0-MeV protons channeled along the 〈100〉 axis for a silicon foil of 3.8 μm thickness. It is shown that the transition from random to a channeling condition is discrete. The energy spectra of transmitted ions show a random peak (lower energy) and a channeled peak (higher energy). The random peak has a fixed energy, while the energy of the channeled peak increases as the target crystal's axis approaches alignment with the direction of the incident ion beam. The results support a model suggesting that the channeled ions lose energy only to valence electrons and are concentrated in a narrow cone about the direction of incidence when they emerge from the crystal. The energy straggling of channeled particles reaches a minimum in the hyper-channeled condition. Both the energy loss and the energy straggling of channeled protons show a dependence on the local electron density.

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  • Physical Review A, 1998, College Park: American Physical Society, pp. 2742-2745

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  • Publication Title: Physical Review A
  • Volume: 57
  • Issue: 4
  • Page Start: 2742
  • Page End: 2745
  • Peer Reviewed: Yes

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  • April 1998

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  • Feb. 1, 2013, 9:58 a.m.

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  • March 27, 2014, 4:46 p.m.

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Zhao, Z. Y.; Arrale, A. M.; Li, S. L.; Marble, D. K.; Weathers, Duncan L.; Matteson, Samuel E. et al. Experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉, article, April 1998; [College Park, Maryland]. (digital.library.unt.edu/ark:/67531/metadc139489/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.