TY - JOUR

T1 - A Collision Cascade Enhancement Model to Postulate Recoil Implantation Reaction Yields in Metal β-Diketonates

AU - Miyakawa, Atsushi

AU - Sekine, Tsutomu

AU - Yoshihara, Kenji

N1 - Funding Information:
The authors thank Dr. K. Masumoto for his kind help with LINAC irradiation. They also thank Prof. T. Matsuura for arranging for irradiation at the nuclear reactor of Rikkyo University. This work was supported by a grant from the Ministry of Education, Science and Culture, No. 03453045.

PY - 1992

Y1 - 1992

N2 - A collision cascade enhancement model is proposed to explain specific features of recoil implantation reactions. The large substitution yield in the reaction M + M(β-dik)3 [Formula Omitted] M(β-dik)3 + M increases with energy and saturates at about 100 keV, with the energy value very high compared to the ordinary hot atom reaction. The yield-energy curve showed an inflexion point for M = 105Rh and M = Rh. The observed yield (Yobs) is expressed by the following equation : where Y0 is initial yield, Sn is a nuclear stopping power, Ej(r) is an efficiency term and F{r) is an attenuation term at distance r. Assuming [Formula Omitted] and [Formula Omitted], integration gives a curve which fits the experimental one when n = 4. The agreement is more satisfactory if S., is taken into consideration in integration. In the collision cascade enhancement model proposed in this study, enhancement mechanisms are supposed to involve such forms of indirect interaction as attack of high-pressure and high-temperature pulses.

AB - A collision cascade enhancement model is proposed to explain specific features of recoil implantation reactions. The large substitution yield in the reaction M + M(β-dik)3 [Formula Omitted] M(β-dik)3 + M increases with energy and saturates at about 100 keV, with the energy value very high compared to the ordinary hot atom reaction. The yield-energy curve showed an inflexion point for M = 105Rh and M = Rh. The observed yield (Yobs) is expressed by the following equation : where Y0 is initial yield, Sn is a nuclear stopping power, Ej(r) is an efficiency term and F{r) is an attenuation term at distance r. Assuming [Formula Omitted] and [Formula Omitted], integration gives a curve which fits the experimental one when n = 4. The agreement is more satisfactory if S., is taken into consideration in integration. In the collision cascade enhancement model proposed in this study, enhancement mechanisms are supposed to involve such forms of indirect interaction as attack of high-pressure and high-temperature pulses.

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U2 - 10.1524/ract.1993.60.23.87

DO - 10.1524/ract.1993.60.23.87

M3 - Article

AN - SCOPUS:84955838591

VL - 60

SP - 87

EP - 92

JO - Radiochimica Acta

JF - Radiochimica Acta

SN - 0033-8230

IS - 2-3

ER -