Systematic recoil study of photospallation reactions at intermediate energies.
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Accession number;99A1007974
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| Title;Systematic recoil study of photospallation reactions at intermediate energies. |
| Author;
HABA HIROMITSU
(Japan Atomic Energy Res. Inst., Advanced Sci. Res. Center, JPN)
MATSUMURA HIROSHI
(Grad. Sch., Kanazawa Univ.)
YAMASHITA MASUMI
(Grad. Sch., Kanazawa Univ.)
SAKAMOTO KO
(Fac. of Sci., Kanazawa Univ.)
WASHIYAMA KOSHIN
(Sch. of Med., Kanazawa Univ.)
OURA YASUJI
(Grad. Sch. of Tokyo Metrop. Univ.)
SHIBATA SEIICHI
(Kyoto Univ., Res. Reactor Inst.)
FURUKAWA MICHIAKI
(Yokkaichi Univ., Fac. Environmental and Information Sci., JPN)
FUJIWARA ICHIRO
(Otemongakuindai Keizai)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.43rd;NO.;PAGE.59(1999)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Recoil properties of 137 radionuclides formed in the photospallation reactions on 27Al, natV, natCu, 93Nb, natAg, natTa, and 197Au induced by bremsstrahlung beams of end-point energies (E0) from 250 to 1100 MeV have been investigated using the thick-target thick-catcher method. The obtained recoil properties showed E0-independence at E0.GEQ.600 MeV, reflecting the resonance nature in photonuclear reaction. The kinematic properties of the product nuclei were analyzed by the two-step vector velocity model. The forward velocity v after the first step of photon-reaction is quite different from that of proton-reaction at Ep.LEQ.3 GeV, though the difference disappears at higher energies. On the other hand the mean kinetic energy T of the residual nucleus in the second step is equal to that of proton-reaction, irrespectively of Ep. The Photon-Induced Intranuclear Cascade Analysis code reproduces well the experimental results of natV and natCu, but the same calculations for heavier targets give lower T values. The parameter values of .EPSILON.s=T/(.DELTA.A/At), which is an average kinetic energy of the emitted particles in a random-walk process of both the photon- and proton-reactions, were found to increase with an increase of At, but change the slopes to become constant above At=100. (author abst.) |
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