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

作者：Kiss G G^*; Szuecs T; Rauscher T; Toeroek Zs; Fueloep Zs; Gyuerky Gy; Halasz Z; Somorjai E

来源：Physics Letters B, 2014, 735: 40-44.

DOI：10.1016/j.physletb.2014.06.011

• Nuclear astrophysics
• Nucleosynthesis
• Astrophysical gamma-process
• Statistical model

The cross sections of the Er-162(alpha, gamma) Yb-166 and Er-162(alpha, n) Yb-165 reactions have been measured for the first time. The radiative alpha capture reaction cross section was measured from E-c.m. = 16.09 MeV down to E-c.m. = 11.21 MeV, close to the astrophysically relevant region (which lies between 7.8 and 11.48 MeV at 3 GK stellar temperature). The Er-162(alpha, n) Yb-165 reaction was studied above the reaction threshold between E-c.m. = 12.19 and 16.09 MeV. The fact that the Er-162(alpha, gamma) Yb-166 cross sections were measured below the (alpha, n) threshold at first time in this mass region opens the opportunity to study directly the alpha-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.

• 出版日期2014-7-30