1OOO
3.5. Summary
Photopion reaction yields for "atFe(y,rt-xn)55Co, 59Co(y,rt-xn)59-rNi (x=2, 3), "atCu(y,rt-rn)62Zn. 75As(y,n-xn)""Se (x=O, 2, 3, 4, 5), '5As(y,x')'5Ge, "atAg(y,x'xn)ioo'i05'i07Cd,
'09Ag(y,tc')i09pd, natln(y,z-xn)iop•'iO•ii'•'i3Sn, and 'i5In(y,n+)'i5Mii5gCd reactions at E,=50-1200 MeV have been presented.
Yield variations as a function ofthe number ofthe emitted neutrons (x) for 59Co, '5As,
i09Ag, and 'i5In were compared with those for the other targets studied in the author's group.
The yield variations at E,l-l-:400 MeV were found to be typical of (3,3) resonance. The reactions for neutron multiplicities as large as xll:6 are notable for targets of mass A,l-l) 100, while only the reactions for smaller x are measurable for the lighter targets.
The measured yields for the (y,x') are consistent with the previous A,-dependence.
On the other hand, the (y,x'xn) reaction yields for xl-lt 1 are small in general compared with those deduced from the previous A,-dependence. The observed yields for individual (y,rcffxn)
139
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Acknowledgements
The author would like to express his gratitude to Prof K. Sakamoto for his patient
guidance, encouragement, and advice throughout the course of this work. The author
expresses his appreciation to Drs. I. Fujiwara, S. Shibata, M. Furukawa, T Nakanishi, K.Komura, and Y. Oura for invaluable suggestions and advice. Mr. Y. Hamajima, Miss.
Fukushima, Mr. Y. Nagamura, and ProÅí Arnano ofKanazawa University are thanked for their cooperatlon ln varlous aspects.
s'
The author is indebted to Drs. H Okuno and K. Masumoto, and the ES crew
members of the High Energy Accelerator Research Organization (KEK) at Tanashi, and toDrs. T. Ohtsuki and the LINAC crew members ofthe Laboratory ofNuclear Science (LNS)
ofTohoku University, for their invaluable cooperation in the course ofexperiments.The students ofthe Radiochemistry Laboratory ofKanazawa University are thanked for their cooperation in radiochemical separations, radioactivity measurements, and data analyses.
This work was supported in part by the Grant-in-Aid for Scientific Research
(BO1470049; 07304077) ofa Ministry ofEducation, Science and Culture ofJapan.i
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