TY - JOUR
T1 - Stellar s -process neutron capture cross sections of Ga 69,71
AU - Tessler, M.
AU - Paul, M.
AU - Halfon, S.
AU - Kashiv, Y.
AU - Kijel, D.
AU - Kreisel, A.
AU - Shor, A.
AU - Weissman, L.
N1 - Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/3
Y1 - 2022/3
N2 - The stable gallium isotopes, Ga69,71, are mostly produced by the weak slow (s) process in massive stars. We report here on measurements of astrophysically relevant neutron capture cross sections of the Ga69,71(n,γ) reactions. The experiments were performed by the activation technique using a high-intensity (3-5×1010 n/s), quasi-Maxwellian neutron beam that closely mimics conditions of stellar s-process nucleosynthesis at kT≈ 40 keV. The neutron field was produced by a mA proton beam at Ep=1925 keV (beam power of 2-3 kW) from the Soreq Applied Research Accelerator Facility (SARAF), bombarding the liquid-lithium target (LiLiT). A 473-mg sample of Ga2O3 of natural isotopic composition was activated in the LiLiT neutron field and the activities of Ga70,72 were measured by decay counting via γ spectrometry with a high-purity germanium detector. The Maxwellian-averaged cross sections at kT=30keV of Ga69 and Ga71 determined in this work are 136(8) and 105(7) mb, respectively, in good agreement with previous experimental values. Astrophysical implications of the measurements are discussed.
AB - The stable gallium isotopes, Ga69,71, are mostly produced by the weak slow (s) process in massive stars. We report here on measurements of astrophysically relevant neutron capture cross sections of the Ga69,71(n,γ) reactions. The experiments were performed by the activation technique using a high-intensity (3-5×1010 n/s), quasi-Maxwellian neutron beam that closely mimics conditions of stellar s-process nucleosynthesis at kT≈ 40 keV. The neutron field was produced by a mA proton beam at Ep=1925 keV (beam power of 2-3 kW) from the Soreq Applied Research Accelerator Facility (SARAF), bombarding the liquid-lithium target (LiLiT). A 473-mg sample of Ga2O3 of natural isotopic composition was activated in the LiLiT neutron field and the activities of Ga70,72 were measured by decay counting via γ spectrometry with a high-purity germanium detector. The Maxwellian-averaged cross sections at kT=30keV of Ga69 and Ga71 determined in this work are 136(8) and 105(7) mb, respectively, in good agreement with previous experimental values. Astrophysical implications of the measurements are discussed.
UR - http://www.scopus.com/inward/record.url?scp=85126625715&partnerID=8YFLogxK
U2 - 10.1103/physrevc.105.035801
DO - 10.1103/physrevc.105.035801
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AN - SCOPUS:85126625715
SN - 2469-9985
VL - 105
JO - Physical Review C
JF - Physical Review C
IS - 3
M1 - 035801
ER -