6533b855fe1ef96bd12b10f3

RESEARCH PRODUCT

Stellar(n,γ)Cross Section ofNi62

Rene ReifarthR. C. VondrasekC. L. JiangJohn P. GreeneH. KoivistoX. D. TangS. K. SinhaS. GhelbergMichael PaulR. C. PardoM. BettanF. KäppelerH. NassarR. ScottS. O'brienT. PenningtonAlexander HegerR. PlagR. PlagSaed DababnehD. J. HendersonMichael HeilI. AhmadK. E. RehmDan BerkovitsPhilippe CollonN. Patronis

subject

Nuclear physicsPhysicsCross section (physics)StarsNucleosynthesisNeutron fluxYield (chemistry)General Physics and AstronomyAtomic physicss-processMass spectrometryAccelerator mass spectrometry

description

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<A<90 produced by the weak s process in massive stars.

yearjournalcountryeditionlanguage
2005-03-11Physical Review Letters
https://doi.org/10.1103/physrevlett.94.092504