Energy Dependence of (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mi>n</mml:mi></mml:math>) Reactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>58</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:

Martin, H. C.; Diven, B.C.

doi:10.1103/physrev.86.565.2

Cited by 25 publications

(1 citation statement)

References 5 publications

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“…gators [13][14][15][16][17] have measured the variation of the cross section for the (n y 2n) reaction as a function of neutron energy from near threshold to 18 to 20 Mev. Most of these measurements have been characterized by rather large standard deviations for the measured cross sections because of the experimental difficulties encountered.…”

Section: Acknowledgmentsmentioning

confidence: 99%

14.4-Mev (n, 2n) Cross Sections

Rayburn

1961

Phys. Rev.

175

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creasing energy, a minimum at about 100°, and a back-angle rise. Figure 8 indicates that the absolute cross sections are also the same. This coincidence of the two cross sections for these companion reactions may be considered as a demonstration of the charge symmetry of nuclear forces. 5 The analysis by Butler and Symonds 6 of the older 10-Mev data on these reactions 4,7 indicates that a simple stripping model can account for the shape of the distributions from the forward peak through the second minimum. Their calculation, however, cannot account for the back-angle rise. An attempt to account for this rise by considering stripping of the triton, using the exchange stripping model of Owen and Madansky, 9,8 led to the conclusion that a triton stripping amplitude that would account for the back-angle rise was inadequate to account for the magnitude of the second maximum. A triton amplitude sufficiently large to give rise to an interference term sufficiently 9 George E. Owen and L. Madansky, Phys. Rev. 105, 1766 (1957); Am. J. Phys. 26, 260 (1958).Cross sections for the (n,2n) reaction have been measured at an incident neutron energy of 14.4=1=0.3 Mev for 27 nuclides. These measurements were made relative to the cross section for the Cu 63 (^,2w)Cu 62 reaction. The relative cross sections were then converted to absolute cross sections by using the weighted mean of several Cu 63 (w,2w)Cu 62 reaction-cross-section measurements made by other investigators.

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