Seminarium Fizyki Jądra Atomowego
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2026-01-15 (10:15) 
Dr Cézar Domingo Pardo (Instituto de Física Corpuscular, Valencia, Hiszpania)
Neutron-capture reactions for stellar nucleosynthesis
Neutron-capture reactions drive the nucleosynthesis of all elements heavier than iron, both via the slow (s-) neutron-capture process during the evolution of low-mass AGB- and massive stars, as well as in the rapid (r-) neutron-capture process during explosive stellar environments.
Unstable s-process branching isotopes offer a unique insight about this mechanism of nucleosynthesis. Neutron-capture measurements on radioactive isotopes, in combination with spectroscopic observations of stellar photospheres and isotopic analysis of primitive meteorites, help to gather unique information about the physical conditions of the stellar environment and the chemical evolution of our galaxy. Experimentally, however, measuring neutron-capture cross sections on radioactive isotopes represents yet one of the most remarkable challenges, mainly due to the difficulties ascribed to the production of a high-quality sample for such experiments, as well as to the sensitivity and selectivity required for the capture reaction channel of interest.
This contribution will present a brief summary about the main s-process branching isotopes measured at CERN n_TOF over the last two decades, thereby showing the corresponding astrophysical implications of the different studies. It will be shown how upgrades in the neutron-beam facility, as well as novel detector developments, have led to a stunning progress in the measurement of radioactive samples. However, in most cases, important limitations still exist related to the lowest accessible isotopic half-life (> few y), the covered neutron-energy ranges (< few keV) and the statistical accuracy (>10%). Some of the future plans at CERN n_TOF to advance further in this field will be presented along with novel initiatives and efforts for overcoming current limitations for the measurement of short-lived nuclei.
Dołącz do spotkania Zoom od godz. 10:00 AM Warszawa
https://uw-edu-pl.zoom.us/j/98722620830?pwd=2wB3UY5ZQbISaeE1D2EVcxH6elnbCr.1
Identyfikator spotkania: 987 2262 0830
Kod dostępu: 917334
Unstable s-process branching isotopes offer a unique insight about this mechanism of nucleosynthesis. Neutron-capture measurements on radioactive isotopes, in combination with spectroscopic observations of stellar photospheres and isotopic analysis of primitive meteorites, help to gather unique information about the physical conditions of the stellar environment and the chemical evolution of our galaxy. Experimentally, however, measuring neutron-capture cross sections on radioactive isotopes represents yet one of the most remarkable challenges, mainly due to the difficulties ascribed to the production of a high-quality sample for such experiments, as well as to the sensitivity and selectivity required for the capture reaction channel of interest.
This contribution will present a brief summary about the main s-process branching isotopes measured at CERN n_TOF over the last two decades, thereby showing the corresponding astrophysical implications of the different studies. It will be shown how upgrades in the neutron-beam facility, as well as novel detector developments, have led to a stunning progress in the measurement of radioactive samples. However, in most cases, important limitations still exist related to the lowest accessible isotopic half-life (> few y), the covered neutron-energy ranges (< few keV) and the statistical accuracy (>10%). Some of the future plans at CERN n_TOF to advance further in this field will be presented along with novel initiatives and efforts for overcoming current limitations for the measurement of short-lived nuclei.
Dołącz do spotkania Zoom od godz. 10:00 AM Warszawa
https://uw-edu-pl.zoom.us/j/98722620830?pwd=2wB3UY5ZQbISaeE1D2EVcxH6elnbCr.1
Identyfikator spotkania: 987 2262 0830
Kod dostępu: 917334