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A blow-in type windowless thick He gas target has been developed to measure He(C,O) γ cross section for astrophysical interests. We use a C beam of energy from 6 to 2.8 MeV and detect O recoils at forward angles. Numerous C backgrounds have been rejected by particle identification techniques. O backgrounds from the target are not many but fatally harmful. Our techniques to reduce the O backgrounds are described. [ABSTRACT FROM AUTHOR]

Space Star (SS) anomaly in nd breakup cross section was first reported in 1989 at E = 13 MeV (Strate et al. in Nucl Phys A 501:51, ), but its origin has not been found yet. In order to obtain suggestions for its origin, we made systematic measurements of pd breakup cross section around SS. In SS configuration, three outgoing nucleons form an equilateral triangle and the triangle is perpendicular to the beam axis. Necessity of the equilateral and perpendicular conditions of SS anomaly was investigated by systematic experiments. Also energy dependence of SS anomaly is being studied at energies from E = 7.5 to 13 MeV. [ABSTRACT FROM AUTHOR]

Inclusive measurements of the D( p, p) pn reaction were made at incident proton energies of 248 MeV and 13 MeV, to investigate the global feature of the pd breakup reaction at intermediate and low energies. At 248 MeV, the cross section and analyzing power A y were measured at four angles from 7° to 20°. The data largely disagree with Faddeev calculations even if 2π-exchange three-nucleon force (2π3NF) or Δ-isobar is included, and the disagreement increases at forward angles. At 13 MeV, the cross section was measured at eight angles from 10° to 70°. The data are well reproduced by a recent pd Faddeev calculation, and the effects of Δ-isobar at 13 MeV are very small. [ABSTRACT FROM AUTHOR]

A measurement of tensor analyzing power and of reaction at was made at RCNP. Both the relation of and the discrepancy in between experiment and calculations were confirmed at 137 MeV, in consistent with our previous measurement at 196 MeV. Present data are compared with KVI data at 133 MeV. [Copyright &y& Elsevier]

We made three kinds of measurements at ; i) experiment at ppFSI, ii) experiment at , and iii) experiment at many angle pairs around the space star. For an easy estimate of Coulomb effects in pd breakup reaction, we proposed Watson- Migdal & Faddeev calculation which was found to give nearly the same results as the pd calculation by Deltuva et al.. Cross sections of i) and ii) are well reproduced by the pd calculation, however, 10-15% discrepancy has been found between the cross section of iii) and the calculation. [Copyright &y& Elsevier]

Cross section of pd breakup at Star configuration (equilateral triangle) was systematically measured at E = 9.5 and 13 MeV/A with varying an angle α between the Star plane and the beam axis. At 13 MeV/A, Star anomaly appears only around Space Star ( α = 90°) configuration. At 9.5 MeV/A, same feature was found in our experimental data at α = 0°−105°, but large difference of about −25% at α = 124°−180° was reported by Köln group. [ABSTRACT FROM AUTHOR]

Systematic measurement of the D( p, pp) n cross section at E p = 13 MeV at star configurations at various inclined angle α is in progress at Kyushu University tandem accelerator laboratory (KUTL). The measured cross section at space star (α = 90°) is about 12% below the recent pd calculation. The next measurement is being made at 0° < α < 90° to see if the large anomaly of about 25% found by the Köln group (2006) at backward α exists also at forward α. [ABSTRACT FROM AUTHOR]

In our previous measurement of pd radiative capture at E d = 137 and 196 MeV, we found an interesting fact that the measured tensor analyzing powers show the relation A xx ≈ A yy , although calculated A xx and A yy are apparently different, A xx ≠ A yy . The measured A yy agrees fairly well with the 3 N calculations, and the measured A xx largely disagrees with calculated A xx . Similar experiments on pd capture have been made at KVI at nearly the same energies of 130–180 MeV. The KVI data also support A xx ≈ A yy relation, but absolute values of A xx and A yy at KVI are about half of RCNP data. Therefore, we made a new experiment of pd capture at E d = 196 MeV. A zz was measured in three different ways, and data analysis is in progress. Preliminary data seem to support our previous data. [ABSTRACT FROM AUTHOR]