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Measurements of neutron capture cross section for $$^{207,208}$$Pb

Segawa, Mariko   ; Toh, Yosuke   ; Harada, Hideo   ; Kitatani, Fumito  ; Koizumi, Mitsuo ; Fukahori, Tokio  ; Oshima, Masumi*; Iwamoto, Nobuyuki  ; Iwamoto, Osamu  ; Hatsukawa, Yuichi; Nagai, Yasuki*; Igashira, Masayuki*; Kamada, So*; Tajika, M.*

Pb isotopes represent a sensitive test for models of $$s$$-process nucleosynthesis, since the decomposition of the complex abundance pattern in these mass regions is difficult to be accounted for by classical $$s$$-process model. Main neutron capture processes, the $$s$$- and $$r$$-processes, attribute to the origin of the isotopes in this mass region. As the aspects of neutron sources of the $$s$$-process, Gallino et al. reported that $$^{13}$$C($$alpha$$, n) neutron source which is burning radiatively at $$kT$$ = 8 keV play an important role on $$s$$-process nucleosynthesis. Hence, in the present study, an anti-Compton NaI(Tl) spectrometer and highly enriched samples are used to determine the $$gamma$$-ray energy spectra from the (n, $$gamma$$) reaction. This NaI(Tl) spectrometer makes it possible to detect the discrete $$gamma$$-ray from the reaction to the low-lying states in $$^{207,208}$$Pb. We give results both neuron capture cross sections for $$^{207,208}$$Pb to obtain the pulse height spectra using NaI(Tl) spectrometer with time of flight method in the wide neutron energy range from 10 to 100 keV. The Maxwellian averaged capture cross sections for $$^{207,208}$$Pb are determined in the astrophysical relevant energy region.



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