TEM investigation of 14 MeV neutron damage

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From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). 14-MeV neutron damage has been investigated in gold by means of transmission electron microscopy (TEM). The sites of energetic displacement cascades are visible due to the presence of vacancy clusters formed by the collapse or rearrangement of vacancies within the depleted zones. In 14-MeV n- induced cascades, a strong tendency towards subcascade formation is found. On the average 1.8 clusters are formed per cascade. Individual cascades with as many as 6 subcascades have been found. The ... continued below

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Pages: 36

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Merkle, K.L. November 1, 1973.

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Description

From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). 14-MeV neutron damage has been investigated in gold by means of transmission electron microscopy (TEM). The sites of energetic displacement cascades are visible due to the presence of vacancy clusters formed by the collapse or rearrangement of vacancies within the depleted zones. In 14-MeV n- induced cascades, a strong tendency towards subcascade formation is found. On the average 1.8 clusters are formed per cascade. Individual cascades with as many as 6 subcascades have been found. The number densities of clusters as well as the number densities of cascades are proportional to the fluence. The cross section for the formation of visible cascades is sigma /sub c/ = 3.3 x 10/sup - 24/ cm/sup 2/. It can be shown that recoi ls from elastic neutron scattering events can account for only about 20% of the visible cascades. The cross section corresponding to the balance of the observed cascades is, within experimental error, equal to the nonelastic neutron scattering cross section. This indicates that all nonelastic scattering events lead to the formation of a visible cascade. Quantitative agreement with what is expected from heavy ion bombardments regarding the cross sections involved is found, however, estimates of the average cascade energy in the 14MeV neutron bombardments are somewhat higher than expected. (10 figures, 29 referenccs) (auth)

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Pages: 36

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  • Joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition, San Francisco, California, USA, 11 Nov 1973

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  • Report No.: CONF-731101--36
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4380829
  • Archival Resource Key: ark:/67531/metadc1020352

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1973

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 27, 2017, 3:46 p.m.

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Merkle, K.L. TEM investigation of 14 MeV neutron damage, article, November 1, 1973; Illinois. (digital.library.unt.edu/ark:/67531/metadc1020352/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.