Alpha induced reaction cross section measurements on 162Er for the astrophysical γ process

Kiss, G. G. and Szücs, T. and Rauscher, T. and Török, Zs. and Fülöp, Zs. and Gyürky, Gy. and Halász, Z. and Somorjai, E. (2014) Alpha induced reaction cross section measurements on 162Er for the astrophysical γ process. Physics Letters B, 735. pp. 40-44. ISSN 0370-2693

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Abstract

The cross sections of the 162Er(α,γ)166Yband 162Er(α,n)165Ybreactions have been measured for the first time. The radiative alpha capture reaction cross section was measured from Ec.m.=16.09MeV down to Ec.m.=11.21MeV, close to the astrophysically relevant region (which lies between 7.8 and 11.48MeV at 3GK stellar temperature). The 162Er(α,n)165Yb reaction was studied above the reaction threshold between Ec.m.=12.19 and 16.09MeV. The fact that the 162Er(α,γ)166Ybcross sections were measured below the (α,n)threshold at first time in this mass region opens the opportunity to study directly the α-widths required for the determination of astrophysical reaction rates. The data clearly show that compound nucleus formation in this reaction proceeds differently than previously predicted.

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