| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Research Abstract |
1. Among the light-ion induced nuclear direct reactions (d,t) reaction on ^2D,^9Be and ^<13>C are expected to be best suited from the view point of reaction omega-values, cross sections and reaction kinematics. The ^7Li(alpha,t)^8Be reaction is also suitable, background accompanying the reaction being small and the separation of the secondary beam from the primary one being easy. The differential cross sections of these reactions were measured at very forward angles, including 0 degree. The resultant differential cross sections at 0 degree were 123.5, 10.2, 22.9 and 12.4, respectively, in units of mb/sr.
2. In the scattering experiments using secondary particles, strong backgrounds from the primary beam is unavoidable. It is therefore necessary to improve S/N ratio on the side of the counter system. For this purpose a transmission-type plastic scintillator counter was prepared and set in front of the drift-type single-wire proportional counter (position counter) situated at the focal plane of the omegaDD magnetic spectrograph. The time-of-flight was measured between this front counter and the energy counter following the position counter. The reduction of the background was satisfactory and the peaks of elastically-scattered secondary particles (tritons) were observed clearly enough to measure scattering cross sections of tritons at forward angles.
3. Existing data of triton elastic scattering cross sections at E_t=9,11,12,15,17,20 as well as at 33 MeV were analyzed with the 6-parameter optical model using the best-fitsearch-code. An energy dependence was found in the well-depth parameters of the real and imaginary central potential. For obtaining more definite results elastic scattering data at higher energies (E_t>40 MeV) are desired.
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