Measurement of the stellar ${}^{58}$Ni$(n,\gamma {)}^{59}$Ni cross section with AMS

Abstract

The ${}^{58}$Ni$(n,\gamma {)}^{59}$Ni cross section was measured with a combination of the activation technique and accelerator mass spectrometry (AMS). The neutron activations were performed at the Karlsruhe 3.7 MV Van de Graaff accelerator using the quasi-stellar neutron spectrum at $kT=25$ keV produced by the ${}^7$Li($p,n$)${}^7$Be reaction. The subsequent AMS measurements were carried out at the 14 MV tandem accelerator of the Maier-Leibnitz-Laboratory in Garching using the Gas-filled Analyzing Magnet System (GAMS). Three individual samples were measured, yielding a Maxwellian-averaged cross section at $kT=30$ keV of $⟨\sigma {⟩}_{30\text{keV}}$= 30.4 (23)${}^{syst}$(9)${}^{stat}$ mbarn. This value is slightly lower than two recently published measurements using the time-of-flight (TOF) method, but agrees within the uncertainties. Our new results also resolve the large discrepancy between older TOF measurements and our previous value.

13 pages, 4 figures; accepted for publication in Phys. Rev. C (2017)

References in corpus (3)

• Galactic Chemical Evolution and solar s-process abundances: dependence on the 13C-pocket structure
• Experimental neutron capture data of ${}^{58}$Ni from the CERN n_TOF facility
• Determination of the stellar (n,gamma) cross section of 40Ca with accelerator mass spectrometry

Cited by in corpus (2)

• The activation method for cross section measurements in nuclear astrophysics
• Unrecognized Sources of Uncertainties (USU) in Experimental Nuclear Data