Deuteron breakup with 3He at 89.4 and 118.9 MeV

doi:10.1016/0375-9474(81)90021-X

Nuclear Physics A

Volume 369, Issue 2, 19 October 1981, Pages 289-300

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Abstract

Quasifree processes were studied by measuring coincident energy spectra for the ²H(³He, ³Hep)n, ²H(³He, tp)p and ²H(³He, dd)p reactions at 89.4 and 118.9MeV. The spectral shape was reproduced with two types of spectator model, that is, a three-body model (TBM) and a four-body model (FBM). The latter contains the effects of projectile breakup processes. Angular correlations of peak cross sections were explained by calculations in the FBM in contrast with those in the TBM. The absolute cross sections were not explained by either model.

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Cited by (9)

Breakup of 3He with 59.6 MeV vector-polarized deuterons at dp quasifree-scattering conditions
1995, Nuclear Physics, Section A
The ³He breakup reaction has been studied with 59.6 MeV vector-polarized deuterons at dp quasifree-scattering (QFS) conditions. In the coincidence energy spectra, large bumps corresponding to the QFS were observed. The calculation in the simple plane-wave impulse approximation (PWIA) qualitatively reproduces the energy spectra, but for the absolute cross sections, the ratio of the experimental values to the calculated values in the PWIA is about 0.27. As for the analyzing powers, the experimental values are greatly reduced as compared with the dp elastic-scattering data. The multiple-scattering effect has been investigated by a calculation taking account of the effects of double-scattering terms on the cross sections and the analyzing powers.
Spin polarization effects in the 3He(d, 3He p)n and the 3He(d, t p)p reactions at E<inf>d</inf> = 17 MeV
1993, Nuclear Physics, Section A
Triple-differential cross sections and vector analyzing powers were measured for the ³He(d, ³He p)n and the ³He(d, t p)p reactions at E_d = 17 MeV. Data are presented for four pairs of coplanar detection angles for the ³He/triton and proton where quasi-free scattering (QFS) or quasi-free reaction (QFR) processes are expected to be dominant, and for five sets of angles where the kinematics favor the nucleon-nucleon final-state interaction (NN FSI). Tensor-analyzing-power measurements, T₂₀ and T₂₂, are also presented for two sets of angles. For the angle pairs where the QFS/QFR mechanism is important, the data are compared with the predictions of PWIA and DWIA calculations. While both calculations are only partly successful in describing the shapes of the quasi-free peaks, the DWIA better predicts their magnitudes. The vector analyzing powers (VAP) in the quasi-free region are at best only qualitatively reproduced by both calculations for the QFS, while for the QFR there is quantitative agreement between both calculations and the data only in the energy region near the center of the QFR maximum. Data obtained for the angle pairs where the NN FSI is present are compared to the predictions of a simple two-step model. The reaction is assumed to proceed by pickup of a nucleon from the ³He by the deuteron, followed by breakup of the recoil dinucleon system. These calculations describe the shapes and magnitudes of the NN FSI peaks reasonably well. The VAP predictions are for the most part also consistent with the two-step assumption. In all of the data, strong contributions are present from nucleon-trion FSI corresponding to the 0⁻ and 2⁻ resonances in ⁴He at E_x = 21.1 and 22.1 MeV, respectively.
Polarization effects in the 2H(3He, tp)p reaction at E = 33 MeV
1991, Nuclear Physics, Section A
Triple-differential cross sections and vector analyzing powers have been measured for the ²H(³He, tp)p reaction at E_He = 32.5 MeV. Data are presented for ten pairs of lab angles in the range θ_t = 15°–30°, θ_p = 20°–55°, most of which correspond to the kinematic region in which the quasi-free ³He + n → t + p reaction with the unobserved proton as spectator is expected to be the dominant mechanism. In addition to the usual QFR maximum, most of the energy-sharing distributions of cross section exhibit a smaller maximum at lower energy along the kinematic locus in the E_t, E_p plane. The analyzing power is generally negative in the vicinity of the QFR peak, but exhibits a maximum in the region between the two peaks in the cross section. This behavior is reproduced by distorted-wave impulse-approximation calculations which include coherently amplitudes corresponding to the cases in which each of the two protons in the final state are the spectator. The best agreement with the data is obtained when the radial integrals are cut off at a maximum radius of ~ 15 fm. The predicted analyzing powers show little sensitivity to the parameters of the two-body reaction, but rather depend almost entirely on the spin-orbit terms in the distorting potentials, a behavior which is similar to that observed in nucleon-transfer reactions involving a transferred orbital angular momentum of zero.
The 2H(3He, 3He p)n reaction with 33-MeV polarized 3He ions
1988, Nuclear Physics, Section A
Triple-differential cross sections and vector analyzing powers have been measured for the ²H(³He, ³He p)n reaction at E_He = 32.5 MeV using polarized ³He ions. Data for ³He lab angles in the range 15°–30° and proton lab angles in the range 20°–60° are presented. The results are compared to both PWIA and DWIA calculations for a quasi-free knockout reaction. Energy-sharing distributions obtained for several combinations of θ_He and θ_p where quasi-free scattering (QFS) predominates are fairly-well reproduced by both types of calculation, but the DWIA calculations are better able to reproduce both the shapes and magnitudes of the quasi-elastic scattering maxima. The vector analyzing powers are generally small $(¦ A_{y} ¦ <0.3)$ near the QFS peaks, and are in agreement with the values predicted by both PWIA and DWIA calculations where QFS predominates. At angle pairs where quasi-free scattering is less pronounced, the PWIA calculations are still in fair agreement with the data in some cases, whereas the DWIA predictions reproduce neither the cross section nor the analyzing-power data. For θ_He = 30°, θ_p = 45°, the cross section is dominated by the np final-state-interaction peak corresponding to singlet deuterons. The relatively structureless analyzing power at these angles is consistent with a two-stage reaction process.
Multiple scattering effects for quasifree scattering in 3He(d, dd)1H breakup reaction
1985, Nuclear Physics, Section A
The differential cross sections for the ³He(d, dd)¹H breakup reaction have been measured in the kinematical region corresponding to quasifree scattering (QFS). The angular dependence of the cross section at the minimum laboratory energy of the unobserved proton has been obtained. The shapes of energy spectra are approximately reproduced by a calculation in the plane-wave impulse approximation (PWIA). As for the angular dependence of the cross section and for the absolute values, the calculation fails to reproduce the experimental results. A calculation with multiple scattering effects reproduces the experimental data well, not only for the shape of the energy spectra but also for the angular dependence. For the absolute cross sections, the ratio of the experimental values to the calculated ones with multiple scattering effects is 0.7 and this value is improved compared with the value of 0.3 obtained by the PWIA calculation.
Energy spectra of deuterons and protons for the d + d reaction at 60 MeV
1982, Nuclear Physics, Section A

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Nuclear Physics A

Abstract

References (9)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Cited by (9)

Breakup of <sup>3</sup>He with 59.6 MeV vector-polarized deuterons at dp quasifree-scattering conditions

Spin polarization effects in the <sup>3</sup>He(d, <sup>3</sup>He p)n and the <sup>3</sup>He(d, t p)p reactions at E<inf>d</inf> = 17 MeV

Polarization effects in the <sup>2</sup>H(<sup>3</sup>He, tp)p reaction at E = 33 MeV

The <sup>2</sup>H(<sup>3</sup>He, <sup>3</sup>He p)n reaction with 33-MeV polarized <sup>3</sup>He ions

Multiple scattering effects for quasifree scattering in <sup>3</sup>He(d, dd)<sup>1</sup>H breakup reaction

Energy spectra of deuterons and protons for the d + d reaction at 60 MeV