Prefragment in Target Fragmentation of Heavy Nuclei withHigh-Energy Heavy Ions.
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Accession number;99A1007975
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| Title;Prefragment in Target Fragmentation of Heavy Nuclei withHigh-Energy Heavy Ions. |
| Author;
YOKOYAMA AKIHIKO
(Osaka Univ., Grad. Sch.)
MORIMOTO SHIN'YA
(Osaka Univ., Grad. Sch.)
ARAKI HIROKAZU
(Osaka Univ., Grad. Sch.)
SANADA JUN
(Osaka Univ., Grad. Sch.)
SAITO TADASHI
(Osaka Univ., Radioisot Res. Center)
BABA HIROSHI
(Osaka Univ., Radioisot Res. Center)
SHIBATA SADAO
(National Inst. of Radiological Sciences)
SHINOHARA ATSUSHI
(Kyoto Univ., Res. Reactor Inst.)
OKUBO YOSHITAKA
(Kyoto Univ., Res. Reactor Inst.)
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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.60(1999)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We performed a series of experiments to investigate the reaction mechanism of target fragmentation of heavy nuclei nuclei for several combinations of targets and projectiles. Especially the yields of produced heavy residues and the linear momenta transferred from a projectile to the products were measured by using a thick-target-thick-catcher method. In this report, the results are analyzed to estimate the masses and the excitation energies of the prefragments which are considered to be produced in the early stage of the process followed by emission of heavy fragments, and play an important role in the fragmentation process. In order to determine the prefragments, we assume a two-step process which includes the formation of a prefragment in the first step and the particle emission from the excited prefragment in the second step. The result shows that the prefragments tend to be produced in the mass region above the target mass rather than that below it. And their excitation energies become larger as the target mass increases. (author abst.) |
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