B. Jenny

Investigation of the three-nucleon system by pd elastic scattering with polarized protons and deuterons

Abstract Angular distributions of cross section and analyzing power A y of protons scattered on deuterium were measured between 8.5 and 22.7 MeV. For the corresponding energy of incident deuterons scattered from hydrogen, angular distributions of the deuteron vector and tensor analyzing powers A y d , A yy and A xx were measured at 6 energies between 17 and 45.4 MeV. The proton and deuteron data together with corresponding data at lower energies are analyzed in terms of Legendre polynomials. The energy dependence of the resulting coefficients are discussed.

Improved NN interaction tested with p-d elastic scattering at Ep = 10 MeV

Abstract A new set of separable NN interactions has been constructed and applied in three-nuclcon Faddeev calculations. The results are tested with precise p-d cross section, vector and tensor analyzing power data at E p = 10 MeV. Coulomb effects are taken into account in an approximate way. Further remaining problems are discussed.

The determination of the D-state asymptotic normalization of the deuteron and triton wavefunctions by the continuation of the 2H(b, p)3H tensor polarizations

Abstract By continuation of 14 tensor polarizations to the stripping and pick-up poles of the 2 H( d ,p) 3 H reaction we have determined ϱ D values for the deuteron and triton wavefunctions. The new precision value for the deuteron 0.0272 ± 0.004 suggests an increase of the applied strength of the OPE potentials. For the triton a value of 0.051±0.005 was found.

Phase-shift analysis of d-α elastic scattering between 3 and 43 MeV

Abstract Phase shifts for d-α elastic scattering have been extracted from differential cross sections and the vector and tensor analysing powers of 4He( d , d)4He scattering in the energy range from 3 to 17 MeV. The angular momenta were restricted to L ≦ 4 and mixing parameters e1 and e2. Good fits could be obtained to nearly all the experimental data analysed. The total reaction cross section and polarization-transfer coefficients were predicted and compared with the measured data; satisfactory agreement was found within the experimental errors. Evidence for a new resonance was found between 11 and 15 MeV.

Absolute calibration of the analysing powers T20 for the 3He(d,d, p)4He reaction at 0° and iT11 for 4He(d,d,d)4He scattering

Abstract The tensor analysing power T 20 for the 3 He ( d , p ) 4 He reaction at 0° has been measured between 0.34 and 11.60 MeV. Absolute calibrations of the measurements have been carried out at 6.69 MeV with the aid of the 16 O d ,α 1 14 N ∗ reaction and at 3.92 and 11.56 MeV with the 4 He ( d , d ) 4 He scattering. Excitation functions of the vector analysing power iT11 for d-α elastic scattering have been measured between 2.38 and 13.60 MeV at θlab = 37.5° and 45° and calibrated absolutely at 4.57 and 11.88 MeV.

Determination of the asymptotic d-state normalization of the deuteron

Abstract New data for the tensor polarization in dp scattering at E d = 10 and 20 MeV are analyzed to determine the asymptotic D-state normalization ϱ D of the deuteron wave function. Multiplying the tensor polarization by the cross section we achieve stable extrapolations to the nucleon pole with the result ϱ D = 0.027 ± 0.005.

Investigation of analysing power maxima in d-α elastic scattering

Abstract An investigation of the conditions for which the vector analysing power or a component of the tensor analysing power reaches its theoretical maximum value has been carried out. For d-α elastic scattering, a search for Ayy = 1 and Ay = −1 was made with the aid of a phase shift analysis. Three such points for Ayy and one possible point for Ay were found in the energy range between 3 and 17 MeV. The precise energies and angles for the maxima of Ayy were found experimentally using an interpolation method. The practical interest in using the results to calibrate polarized deuteron beams is discussed. A time reversal invariance test in connection with the findings of this investigation is proposed.

Comparison of a nearly complete pd elastic scattering data set with Faddeev calculations

Abstract Angular distributions of the cross section, analyzing powers and polarization transfer coefficients of pd elastic scattering have been measured at a proton laboratory energy of 10 MeV. Of the 23 determined observables 19 quantities are independent and constitute a nearly complete experiment. They provide information on different aspects of the NN interaction. The data set is compared with Faddeev calculations using an NN interaction in a separable representation. Excellent to satisfactory agreement is observed for most observables. No basic objections could be found for the use of separable potentials, considering the on- and off-shell behaviour and the sensitivity of the measured quantities.

Determination of the asymptotic D- to S-state normalization of the deuteron wave function

Abstract Cross-section and tensor analyzing power data of d—p elastic scattering in the deuteron energy region between 5 and 45 MeV are used to determine the asymptotic D- to S-state ratio ϱ D of the deuteron wave function. The data obtained at ten different deuteron energies give consistent results. An averaged value of ϱ D = 0.0259 ± 0.0007 was found.

Investigation of the 1+ resonance in 6Li by d-α scattering between 6 and 7 MeV

Abstract Previous analyses of d- 4 He elastic scattering have established the presence of a 1 + resonance near 5.7 MeV excitation energy in 6 Li. The energy dependence of the s-wave to d-wave mixing parameter through this resonance gives an indication of the tensor force contributing to the interaction. In this work, we have made a detailed study of this parameter by obtaining complete angular distributions of the differential cross section and all four analyzing powers for 4 He(d, d) 4 He at seven energies between 6 and 7 MeV. The phase-shift analysis of these data provides a detailed parameterization to compare with theoretical calculations and shows for the first time the necessity for a complex mixing parameter. An R -matrix fit to the phase shifts establishes more precisely the location and width of the resonance.