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Hiroshi Matsumura, K. Washiyama, Hiromitsu Haba, Y. Miyamoto, Y. Oura, K. Sakamoto, S. Shibata, M. Furukawa, I. Fujiwara, Nagai, T. Kobayashi, K. Kobayashi

Target-dependence of light fragment production in photonuclear reactions at intermediate energies

Yields of ⁷Be, ¹⁰Be, ²²Na, ²⁴Na and ²⁸Mg produced from ^natB, ^natC, ^natO, ²³Na, ²⁷Al, ^natSi, ^natS, ^natCl, ^natK, ^natCa, ^natV, ⁵⁵Mn, ^natFe, ⁵⁹Co, ^natNi, ^natCu, ⁸⁹Y, ^natAg, ^natIn, ¹⁴¹Pr, ¹⁵⁹Tb, ¹⁶⁵Ho and ¹⁹⁷Au in irradiations with bremsstrahlung having maximum end-point energies up to 1200 MeV were measured by γ-ray spectrometry (⁷Be, ²²Na, ²⁴Na and ²⁸Mg) and accelerator mass spectrometry (¹⁰Be). The yields of heavier fragments, ³⁹Cl, ^{43, 44m, 44g, 46, 47, 48}Sc, ⁵⁹Fe, and ^{56, 57, 58, 60}Co, were also measured by γ-ray spectrometry in order to survey the relative contribution of fragmentation to spallation and/or fission in the mass yield curves. A distinct difference of the target mass-dependence of these yields has made it possible to disentangle the contributions of photospallation and photofragmentation processes. It was found that the neutron-to-proton ratios of targets strongly affect the formation of the nuclei by fragmentation as revealed in the yields of the isotopic pairs as well as of the single isotopes. The photon results were compared with those of proton-induced reactions, and no clear effect due to the difference of the initial interactions of photons and protons with nuclei was found in the fragment yields.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 06/2000
Pages: 313

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