M. Hatano

Resolving the Discrepancy of 135 MeV pd Elastic Scattering Cross Sections and Relativistic Effects

Three precise measurements for elastic pd scattering at 135 MeV/A have been performed with the three different experimental setups. The cross sections are described well by the theoretical predictions based on modern nucleon-nucleon forces combined with three-nucleon forces. Relativistic Faddeev calculations show that relativistic effects are restricted to backward angles. This result supports the two measurements recently reported by RIKEN and contradicts the KVI data.

Determination of the Gamow–Teller quenching factor from charge exchange reactions on 90Zr

Abstract Double differential cross sections between 0°–12° were measured for the 90 Zr(n, p) reaction at 293 MeV over a wide excitation energy range of 0–70 MeV. A multipole decomposition technique was applied to the present data as well as the previously obtained 90 Zr(p, n) data to extract the Gamow–Teller (GT) component from the continuum. The GT quenching factor Q was derived by using the obtained total GT strengths. The result is Q = 0.88 ± 0.06 , not including an overall normalization uncertainty in the GT unit cross section of 16%.

Analyzing powers Ayy , Axx , Axz and Ay in the dd → 3Hen reaction at 270 MeV

The data on the tensor Ayy, Axx, Axz and vector Ay analyzing powers in the dd → Hen obtained at Td = 270 MeV in the angular range 0 ◦ – 110◦ in the c.m. are presented. The observed negative sign of the tensor analyzing powers Ayy, Axx and Axz at small angles clearly demonstrate the sensitivity to the ratio of the D and S wave component of the He wave function. However, the one-nucleon exchange calculations by using the standard He wave functions have failed to reproduce the strong variation of the tensor analyzing powers as a function of the angle in the c.m. PACS. 24.70.+s Polarization phenomena in reactions – 25.10.+s Nuclear reactions involving few-nucleon system – 21.45.+v Few-body systems

Measurement of the tensor analyzing power T20 in the dd→He3n and dd→H3p at intermediate energies and at zero degree

The data on the tensor analyzing power T20 in the dd->^3Hen and dd->^3Hp reactions at 140, 200 and 270 MeV of the deuteron kinetic energy and at zero degree obtained at RIKEN Accelerator Research Facility are presented. The observed positive sign of T20 clearly demonstrates the sensitivity to the D/S wave ratios in the ^3He and ^3H in the energy domain of the measurements. The T20 data for the ^3He-n and ^3H-p channels are in agreement within experimental accuracy.

MEASUREMENT OF p+d ELASTIC SCATTERING AT EP = 392 MEV

The cross sections and spin observables of the p+d elastic scattering have been measured at 392 MeV. The results are compared with the results of Faddeev calculations with and without including the three nucleon force.

Polarized Solid Proton Target for RI Beam Experiments

A polarized solid proton target system that can be used for radioisotope beam experiments has being developed. A high‐power Ar‐ion laser has been installed to improve proton polarization. With the laser, proton polarization of 36.8±4.2% has been achieved in 0.3 T at 77 K. The new target system has been constructed toward the first nuclear physics experiment scheduled in 2003.

Angular distributions of the vector A y and tensor A y y , A x x , A x z analyzing powers in the d ⃗ d → 3 H p reaction at 200 MeV

A complete set of analyzing powers for the

THE ANGULAR DISTRIBUTIONS OF THE VECTOR Ay AND TENSOR Ayy, Axx, Axz ANALYZING POWERS IN THE dd → 3Hp AND dd → 3Hen REACTIONS AT Ed = 200 AND 270 MeV

\stackrel{P\vec}{d}d\ensuremath{\rightarrow}{}^{3}\text{H}p

Determination of the Gamow‐Teller Quenching Factor via the90Zr(n, p) Reaction at 293 MeV

reaction at the kinetic beam energy of 200 MeV has been measured in the full angular range in the c.m. frame. The observed signs of the tensor analyzing powers

Vector analyzing power Ay and tensor analyzing powers Ayy, Axx, and Axz in the reaction \vec dd → 3Hp at the energy of 200 MeV

{A}_{yy}