Cross sections for the (γ, n) reaction in Cu63, Cu65, Zn64 Sb121 and Pr141, measured with monochromatic gamma rays

doi:10.1016/0029-5582(61)90273-5

Nuclear Physics

Volume 23, February–March 1961, Pages 468-480

https://doi.org/10.1016/0029-5582(61)90273-5 Get rights and content

Abstract

Cross sections for the (γ, n) reaction in Cu⁶³, Cu⁶⁵, Zn⁶⁴, Sb¹²¹ and Pr¹⁴¹ have been measured using gamma rays from the Li⁷ (p, γ)Be⁸ and B¹¹ (p, γ)C¹² reactions. NaI(Tl) crystal were used to monitor the radiation and to measure the residual activity.

The Cu⁶³(γ, n)Cu⁶² cross section for the lithium radiation from the 440 KeV resonance is 59 ± 6 mb. The cross sections at 12.2, 14.8, 16.7 and 17.6 MeV are then 11 ± 2, 33 ± 4, 63 ± 8 and 73 ± 8 mb, respectively. These results confirm the bremsstrahlung measurement of the shape of the cross section but the absolute cross section values are 25% low er.

Cross sections for the lithium resonance radiation, measured relative of that of Cu⁶³, are: Cu⁶⁵, 70 ± 7 mb; Zn⁶⁴, 40 ± 4 mb; Sb¹²¹, 122 ± 13 mb; Pr¹⁴¹, 181± 20 mb.

Comparison with previous results suggests that discrepancies are due to inaccuracies in absolute β-counting.

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^†: Now at Physics Dept., Massachusettss Institute of Technology, Cambridge, Mass., U.S.A.

^††: Now at Dept. of Physics, University of Wisconsin, Madison, Wis., U.S.A.

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Nuclear Physics

Abstract

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