14.4-Mev (n, 2n) Cross Sections

Abstract

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.

Cross-section measurements of neutron-induced reactions on GaAs using monoenergetic beams from 7.5 to 15 MeV

“…The cross-section results for the 69 Ga(n, 2n) 68 Ga reaction from the present work are consistently lower than the previously reported values by Rayburn et al [19], Bormann et al [9], and Pu et al [8]. However, it is noteworthy to mention the different experimental techniques adopted in the previous measurements of the 69 Ga(n, 2n) cross sections, compared to the present work.…”

Cross section measurements for gallium in the neutron energy range of 13.5 to 14.8MeV

“…In the 13.5-14.8 MeV energy range, our results are in agreement with Refs. [10,12,13,15,17,18,[20][21][22][23][24][25] and model calculations [43] within experimental uncertainty, while at neutron energy 13.5 MeV, our values are somewhat higher than those of Cevolani et al [16] and evaluated data in ENDF/B-VII.0 [49] and CENDL-3.1 [50]. 71 Ga(n, 2n) 70 Ga reaction.…”

Half-life measurement of 44Sc and 44mSc

“…The green diamond is the latest recorded value (García-Toraño et al, 2016) before publication of this article. The black spots refer to previous measurements (Hibdon et al, 1945;Waffler and Hirzel, 1948;Andersson, 1954;Khurana and Hans, 1961;Rayburn, 1961 andDillman et al, 1963). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)…”