PT Journal
AU n_TOF Collaboration (Amaducci, Sea
   Babiano-Suarez, V
   Caballero-Ontanaya, L
   Domingo-Pardo, C
   Ladarescu, I
   Tain, JL
   Tarifeño-Saldivia, A
TI Measurement of the 140Ceðn;γþ Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2024
BP 122701
EP 8pp
VL 132
IS 12
DI 10.1103/PhysRevLett.132.122701
LA English
AB 140Ce(n, gamma) is a key reaction for slow neutron -capture (s -process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty approximate to 5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron -sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s -process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.
ER