T. Masaki

New Approach for Measuring the (n,γ) Cross Section of a Nucleus by a Few keV Neutron

We have for the first time determined with high precision the energy spectrum of low-energy neutrons ( E n <10 keV) which are produced in the 7 Li( p , n ) 7 Be reaction, by detecting γ-rays of the 197 Au( n ,γ) 198 Au reaction whose cross section is known. An anti-Compton NaI(Tl) spectrometer played an essential role in detecting the γ-rays with a good signal to noise ratio by discriminating large background due to thermalized neutrons in the measurement room. The low energy neutrons thus derived were successfully used to measure the 62 Ni( n ,γ) 63 Ni reaction cross section. The present low energy neutrons could be extensively used for cross section measurements for neutron capture reactions and elastic scatterings from nuclei of nuclear astrophysical interests.

Neutron capture and inelastic scattering cross sections for 186Os, 187Os, and 189Os and the Re‐Os chronology

We measured the neutron capture cross sections of 186,187,189Os taking for the first time their pulse height spectra for neutrons between 5 and 90 keV by means of an anti‐Compton NaI(Tl) spectrometer. The neutron inelastic scattering cross section for 187Os as well as the neutron elastic scattering cross sections for 186,187Os were also observed with use of 6Li‐glass scintillation detectors with a small systematic uncertainty.

Neutron capture cross sections of {sup 186}Os, {sup 187}Os, and {sup 189}Os for the Re-Os chronology

Discrete as well as continuum

Neutron capture cross sections of Os-186, Os-187, and Os-189 for the Re-Os chronology

\ensuremath{\gamma}

Neutron capture cross sections of 186Os, 187Os, and 189Os for the Re-Os chronology

-ray energy spectra from the neutron capture by

Neutron capture cross sections of Os, Os, and Os for the Re-Os chronology

^{186}\mathrm{Os}

Measurement of the 12C(α,γ)16O Reaction Cross Section Using Pulsed α Beams

,

E2 and E1 Cross Section of the

^{187}\mathrm{Os}

^{12}

, and

C

^{189}\mathrm{Os}