You are here: Home :: Area NEM :: Chemistry :: Physical chemistry

Hiroshi Matsumura, Toshiya Sanami, Kazuyoshi Masumoto, Noriaki Nakao, Akihiro Toyoda, Masayoshi Kawai, Takahiro Aze, Hisao Nagai, Masashi Takada, Hiroyuki Matsuzaki

Target dependence of beryllium fragment production in neutron- and alpha-induced nuclear reactions at intermediate energies

The yields of ⁷Be from ^natC, ²⁷Al, ^natCu, ^natAg and ¹⁹⁷Au targets and ¹⁰Be from ^natCu, ^natAg and ¹⁹⁷Au targets in alpha- (400 MeV) and neutron- (maximum end-point energy, E₀ = 500 MeV) induced reactions were measured in order to compare them with the photonuclear-reaction yields at E₀ = 1000 MeV. The target-mass dependences of the yields of ⁷Be and ¹⁰Be showed very similar trends among alpha-, neutron-, and photon-induced reactions. The fragmentation yields of ⁷Be decreased more slowly, and those of ¹⁰Be increased gradually with an increase in the target mass; both yields intersected at an approximate target mass of 125. The exponential increase in the fragmentation-yield ratios of ¹⁰Be to ⁷Be with an increase in the neutron-to-proton ratio of the targets suggests that pre-formation of the fragments inside the excited nuclei is strongly influenced by the target properties, such as N/Z. Furthermore, the effect of the incident particle was clearly observed in the yield ratios of ¹⁰Be to ⁷Be from the Cu and Ag targets.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 93, 09/2005
Pages: 497 - 501

Show full article (external site)

Show all available items of this journal

 

Area NEM