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R. Holub A.F. Zeller G.R. Choppin R.J. De Meijer H.S. Plendl 《Physics letters. [Part B]》1973,43(5):375-376
Yield curves for formation of 7Be and other radio-nuclides from bombardment of C, Al and Si targets with 16–58 MeV 14N and 16O ions were measured. The 7Be yields disagree by several orders of magnitude with Hauser-Feshbach and transition-state predictions. The other yields are in order-of-magnitude agreement with nucleon and/or α-particle evapolation calculations. 相似文献
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In many generic combustion models, one finds that a combustionwave will develop with a specific wave speed. However, thereare possible initial temperature profiles which do not evolveinto such waves, but rather die out to the ambient temperature.There can exist, in some models, a clear distinction betweenthose initial conditions that do evolve into combustion wavesand those that do not; this is sometimes referred to as thewatershed initial condition. When fuel consumption is consideredto be negligible, analytical methods can be used to obtain theexact watershed. In this paper, we consider the problem of determiningpseudo-watersheds and ascertaining the relationship betweenthese pseudo-watersheds and the exact watersheds. In the processa novel weight-function approach for infinite spatial domainsis developed. 相似文献
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A. Kreissl A. D. Hancock H. Koch Th. Köhler H. Poth U. Raich D. Rohmann A. Wolf L. Tauscher A. Nilsson M. Suffert M. Chardalas S. Dedoussis H. Daniel T. von Egidy F. J. Hartmann W. Kanert H. Plendl G. Schmidt J. J. Reidy 《Zeitschrift für Physik A Hadrons and Nuclei》1988,329(2):235-241
The strong ¯p-nucleus spin-orbit interaction was investigated in a measurement of the strong-interaction effects of the 9→8 transition in ¯p 174Yb at the Low-Energy Antiproton Ring (LEAR) at CERN. This measurement was part of an experimental programme where, for the first time, the fine-structure components of the last observable X-ray transition in a ¯p atom, which carries information on the strong ¯p-nucleus interaction, were resolved and studied individually. The observed splitting ΔE exp=2408±26 eV consists of the electromagnetic fine-structure splitting ΔE FS=2350 eV and an additional splitting Δ?=58±26 eV. In addition, one finds a significant difference in the level widths of Δ=195±59 eV with the larger value?=1216±41 eV for the lower fine-structure level. This experiment follows an earlier measurement on ¯p 138Ba, where the transition 8→7 is influenced by the strong interaction. In this case, however, the fine-structure components could not be resolved. The results for174Yb may be attributed to a spin-orbit (LS) term in the complex strong-interaction potential. 相似文献
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The activation cross section for was determined to be 5.1 ± 2.2 mb by counting the residual β+ activity of 27Si. This result is compared with other pion-nucleus cross sections. A value for the elementary pion-nucleon cross section inside the nucleus is derived from this result and compared with an estimate from a phenomenological expression. 相似文献
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Yield curves were measured for formation of 7Be and of residual nuclei formed by α-particle and nucleon emission following the reactions of 16 to 75 MeV 14N and 16O ions with thick, natural C, Mg, Al and Si targets. The results are discussed in terms of statistical model calculations. Yield curves calculated with computer codes based on the statistical model are compared with the experimental results. 相似文献