Stellar (n,gamma) cross section of Ni-62

作者：Nassar H; Paul M^*; Ahmad I; Berkovits D; Bettan M; Collon P; Dababneh S; Ghelberg S; Greene JP; Heger A; Heil M; Henderson DJ; Jiang CL; Kappeler F; Koivisto H; O'Brien S; Pardo RC; Patronis N; Pennington T; Plag R; Rehm KE; Reifarth R; Scott R; Sinha S; Tang X; Vondrasek R

来源：Physical Review Letters, 2005, 94(9): 092504.

DOI：10.1103/PhysRevLett.94.092504

The Ni-62(n,gamma)Ni-63(t(1/2) = 100 +/- 2 yr) reaction plays an important role in the control of the flow path of the slow neutron-capture (s) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT = 25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the Ni-63 product nuclei. The experimental value of 28.4 +/- 2.8 mb, fairly consistent with a recent calculation, affects the calculated net yield of Ni-62 itself and the whole distribution of nuclei with 62 < A < 90 produced by the weak s process in massive stars.

• 出版日期2005-3-11