TY  - JOUR
AU  - n_TOF Collaboration (Mosconi, M. et al
AU  - Domingo-Pardo, C.
AU  - Tain, J. L.
PY  - 2010
DA  - 2010//
TI  - Neutron physics of the Re/Os clock. I. Measurement of the (n, gamma) cross sections of Os-186,Os-187,Os-188 at the CERN n_TOF facility
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 015802
EP  - 10pp
VL  - 82
IS  - 1
PB  - Amer Physical Soc
AB  - The precise determination of the neutron capture cross sections of Os-186 and Os-187 is important to define the s-process abundance of Os-187 at the formation of the solar system. This quantity can be used to evaluate the radiogenic component of the abundance of Os-187 due to the decay of the unstable Re-187 (t(1/2) = 41.2 Gyr) and from this to infer the time duration of the nucleosynthesis in our galaxy (Re/Os cosmochronometer). The neutron capture cross sections of Os-186, Os-187, and Os-188 have been measured at the CERN n_TOF facility from 1 eV to 1 MeV, covering the entire energy range of astrophysical interest. The measurement has been performed by time-of-flight technique using isotopically enriched samples and two C6D6 scintillation detectors for recording the prompt. rays emitted in the capture events. Maxwellian averaged capture cross sections have been determined for thermal energies between kT = 5 and 100 keV corresponding to all possible s-process scenarios. The estimated uncertainties for the values at 30 keV are 4.1, 3.3, and 4.7% for Os-186, Os-187, and Os-188, respectively.
SN  - 0556-2813
UR  - https://doi.org/10.1103/PhysRevC.82.015802
DO  - 10.1103/PhysRevC.82.015802
LA  - English
N1  - ISI:000279940200007
ID  - n_TOFCollaborationMosconi_etal2010
ER  -