Stellar (n,gamma) cross section of 62Ni

Stellar (n,gamma) cross section of 62Ni

The 62Ni(n,gamma)63Ni(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 measure...

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Veröffentlicht in:Physical review letters 2005-03, Vol.94 (9), p.092504-092504
Hauptverfasser: Nassar, H, Paul, M, Ahmad, I, Berkovits, D, Bettan, M, Collon, P, Dababneh, S, Ghelberg, S, Greene, J P, Heger, A, Heil, M, Henderson, D J, Jiang, C L, Käppeler, F, Koivisto, H, O'Brien, S, Pardo, R C, Patronis, N, Pennington, T, Plag, R, Rehm, K E, Reifarth, R, Scott, R, Sinha, S, Tang, X, Vondrasek, R
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Sprache:eng
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Zusammenfassung:The 62Ni(n,gamma)63Ni(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 63Ni product nuclei. The experimental value of 28.4+/-2.8 mb, fairly consistent with a recent calculation, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62
ISSN:0031-9007