Publications (12)0 Total impact
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Article: Transfer reactions below the Coulomb barrier
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ABSTRACT: Heavy ion one neutron transfer reactions have been investigated at energies below the Coulomb barrier. Using a DWBA treatment, products of neutron spectroscopic factors have been derived and compared with nuclear model predictions.Annals of Physics. -
Article: Heavy-ion reactions induced by 16O, 18O and 19F ions
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ABSTRACT: Excitation curves have been determined from γ-ray yield measurements for heavyion reactions induced by Elab = 12–30 MeV 16O, 18O and 19F ions incident upon thick targets of 9Be, 10B, 11B, 12C and 23Na. The yields of radioactive decay products with half-lives greater than one second were measured; hence a large number of the outgoing reaction channels could be observed. The preponderance of heavy reaction products suggests compound-nucleus formation as the dominant reaction mechanism. Statistical-model calculations with a spin-dependent level density have been performed, in which the nuclear moment of inertia was treated as a parameter. Many of the results can be explained satisfactorily with a nuclear moment of inertia 0.55 to 0.7 of the rigid body value.Nuclear Physics A. -
Article: Investigation of excited states of 4He via the 2H(d, p)3H and 2H(d, n)3He reactions using a polarized deuteron beam
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ABSTRACT: The differential cross section σ0(θ) and the analysing powers iT11(θ), T20(θ), T21(θ) and T22(θ) of the reactions 2H(d, p)3H and 2H(d, n)3He have been measured. The 2H(d, p)3H reaction was measured at 9 energies between 3.0 and 11.5 MeV at lab angles between 7.5° and 160°. The reaction 2H(d, n)3He was measured at 10.0 and 11.5 MeV at c.m. angles ranging from 95° to 156°. The results were fitted with Legendre polynomials and the resulting coefficients analysed for possible resonances in 4He. Differences in the analysing powers between the 2H(d, p)3H and the 2H(d, n)3He reactions can be explained by Coulomb effects.Nuclear Physics A. -
Article: Polarization of protons inelastically scattered on 24Mg, 52Cr and 58Ni
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ABSTRACT: The polarization of protons elastically and inelastically scattered on 24Mg, 52Cr and 58Ni leaving the residual nucleus in its first excited state was measured with a carbon polarimeter. The energy of the incident protons was varied between 5.38 and 5.95 MeV and the lab scattering angle between 45° and 120°. In addition, the excitation functions were measured for 24Mg (p, p1)24Mg∗ between 5 and 6 MeV and for 52Cr(p, p0)52Cr and 52Cr(p, p1)52Cr∗ between 5 and 6.5 MeV. Large values of the polarization were determined for the protons scattered on 24Mg and in agreement with the predictions of the statistical CN model, no polarization was observed for the protons inelastically scattered on 58Ni. Relatively large polarizations were found in the inelastic scattering on 52Cr which seems to indicate a violation of the statistical assumptions. The latter had been believed to be fulfilled, since (p, p′γ) angular correlation measurements on 52Cr had given excellent agreement with the statistical CN theory. On the other hand, the angular cross-correlation function of the cross-section fluctuations also does not agree with the statistical theory. The correlated intermediate structure of the excitation functions can probably be interpreted as an excitation of doorway states which in turn would also explain the measured polarizations.Nuclear Physics A. -
Article: Measurement of the tensor polarization 〈T21〉 and 〈T22〉 in deuteron-alpha elastic scattering
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ABSTRACT: The tensor polarization parameters 〈T21〉 and 〈T22〉 have been measured with a polarized deuteron beam at c.m. angles between 33.6° and 145.8° in the energy range 3 to 11.5 MeV. The results show that d-α scattering is useful as an analyser for the deuteron tensor polarization 〈T22〉 for deuteron energy in excess of 4 MeV. The tensor component 〈T21〉 is small at most energies, reaching a maximum value of 〈T21〉 = +0.26 at Ed = 4.81 MeV.Nuclear Physics A. 148(2):391-400. -
Article: The analysing powers iT11, T20, T21 and T22 in deuteron-deuteron elastic scattering between 6 and 11.5 MeV
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ABSTRACT: The angular distributions of the analysing powers iT11(θ), T20(θ), T21(θ) and T22(θ) of the elastic scattering of polarized deuterons on deuterons have been measured at deuteron energies of 6.0, 8.0, 10.0 and 11.5 MeV. The vector component has small but non-zero values which change sign between 6.0 and 10.0 MeV. The tensor components have increasing values with increasing energy. The results are discussed in respect of resonances in 4He and a term scheme is proposed for a complete phase-shift analysis.Nuclear Physics A. 193(1):149-154. -
Article: Phase-shift analysis of d-α elastic scattering
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ABSTRACT: Phase shifts of angular momenta l ≦ 3 for d-α elastic scattering were extracted from differential cross sections and the vector and tensor analysing powers of the scattering between 3 and 11.5 MeV. Good fits to all the experimental data analysed could be obtained and the total reaction cross section correctly predicted. Continuous extension of the phase shifts to lower and higher energies is possible, and the P-wave phase shifts are well fixed by the analysed data. Single-level parameters of the 2+ and 1+ (T = 0) resonances were determined. The coupling between the S- and D-waves for J = 1 was found to be very small. No alternative solution could be found from the data used in this analysis.Nuclear Physics A. -
Article: Measurement of the analysing powers iT11, T20, T21 and T22 in elastic deuteron-proton scattering
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ABSTRACT: The analysing powers iT11, T20, T21 and T22 for the elastic scattering of polarized deuterons by protons have been measured at deuteron energies of 6, 8, 10 and 11.5 MeV with the polarized deuteron beam from a tandem accelerator. The measurements cover the c.m. angular range from 40° to 155° and show small but non-zero analysing powers at all energies.Nuclear Physics A. -
Article: The differential cross section and the analysing powers iT11,T20,T21 and T22 of the reaction 3He(d, p)4He between 2.8 and 11.5 MeV
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ABSTRACT: The differential cross section σ0(θ) and the analysing powers iT11(θ), T20(θ), T21(θ) and T22(θ) of the reaction 3He(d, p)4He have been measured for 7 energies between 2.8 MeV and 11.5 MeV at lab angles between 0° and 160°. The results were fitted with Legendre polynomials. The energy dependence of the resulting Legendre coefficients indicate resonance-like behaviour at energies corresponding to excitations of 16.6 MeV, 17.5 MeV, 20.0 MeV, 20.9 MeV and 22.4 MeV in 5Li. The reaction 3He(d, p)4He is an excellent analyser for deuteron vector and tensor polarization when specific angles for the different analysing power are chosen.Nuclear Physics A. -
Article: Absolute calibration of tensor analysing powers of the 3He(d, p)4He and the 4He(d, d)4He reactions
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ABSTRACT: The tensor analysing power T20 of 3He(d, p)4He has been calibrated absolutely at θlab = 0° and Ed = 6.49 and 9.30 MeV with the reaction. These measurements have been used to calibrate T20 and T22 in 4He(d, d)4He elastic scattering absolutely at two corresponding energies and θlab = 30°, 60° and 75°.Nuclear Physics A. -
Article: Elastic scattering of vector polarized deuterons on 4He
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ABSTRACT: The vector polarization parameter 〈iT11〉 of deuterons scattered on 4He has been measured using the vector polarized deuteron beam from the ETH tandem accelerator. Measurements were made at c.m. angles between 33.6° and 151° in the energy range of 3 to 11.5 MeV. The results show that d-α scattering is useful as an analyser for deuteron vector polarization for most deuteron energies in this energy range.Nuclear Physics A. -
Article: Measurement of the tensor polarization 〈 T20〉 in deuteron-alpha elastic scattering
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ABSTRACT: The tensor polarization parameter 〈T20〉 of deuterons elastically scattered on 4He has been measured with the polarized deuteron beam from the ETH tandem accelerator. Measurements were made at c.m. angles between 33.6° and 145.8° in the energy range 3 to 11.5 MeV. The results show that d-α scattering is useful as an analyser for deuteron tensor polarization for deuteron energies in excess of 4 MeV.Nuclear Physics A.
