Energy levels of A = 21−44 nuclei (V)

Measurement of the Neutron Polarization from D(p, n)2p

Publisher Summary The chapter describes an experiment in which the Texas A&M multidetector scattering chamber was used to measure the cross section for p-d breakup in the form of a partial Dalitz plot. The direction of emission of proton-4 was held fixed at approximately 43°, whereas all the directions of emission of particle - 3 were included to measure the cross section for p-d breakup. The final state interaction (FSI) and qasifree scattering (QFS) effects are expected from break-up studies when performed with conventional two detector apparatus. The Dalitz plot cross section is over-simplified to the extent that it ignores the fact that FS and Fd are in general different for different spin states in the three nucleon system. In addition, Fd is actually the sum of several multiple scattering terms rather than just the double scattering term alone.

Destructive Interference Effects in D(p, 2p)n at E p =39.5 MeV

We examine the feasibility of using the /sup 2/H(p, pp) n reaction as a means of extracting information about the short-range behavior of the nuclear force not obtainable from N-N scattering experiments To do this we use several separable potentials and examine the predicted cross section in various regions of phase space and for beam energies between 14 and 65 MeV The questions that we address are likely to be insensitive to Coulomb effects Both the form factor and the energy dependence of the potentials have been modified from the usual Yamaguchi form The form of the energy dependence is chosen to obtain phase-shift equivalence for two different form factors while guaranteeing a unitary two-body scattering amplitude The sensitivity of breakup results to the on-shell and off-shell aspects of the nuclear force is examined and discussed Significant on-shell sensitivity occurs for breakup amplitudes in all states and for cross sections over all regions of phase space Off-shell sensitivity appears only in the S = 1/2, L = 0 breakup amplitudes, with all S = 3/2 and all L > 0 amplitudes exhibiting negligible off-shell dependence This result leads to only a very small (< or = 5%) off-shell sensitivity formore » quasifree scattering However, cross sections far from quasifree scattering, and in particular cross sections in the final-state interaction region of phase space, exhibit as much as a 50% variation for phase-shift-equivalent potentials This sensitivity is small at low beam energy and increases with increasing energy The energy dependence at negative energies of one potential is also altered to adjust the triton binding energy This enables us to compare phase-shift-equivalent potentials differing off shell but predicting the same triton binding energy The energy dependence of this potential is somewhat unconventional Fixing of the triton binding energy reduces the off-shell sensitivity appreciably only for E approximately-less-than 20 MeV (AIP)« less

/sup 2/H(p, pp) n reaction as a probe of the short-range nuclear force

Differential cross sections for the reactions ${}^{9}\mathrm{Be}{(p,pn)}^{8}\mathrm{Be}$ and ${}^{9}\mathrm{Be}{(p,2p)}^{8}\mathrm{Li}$ were simultaneously measured at an incident proton energy of 70 MeV. The measured spectra were decomposed into contributions from $1p$ and $1s$ shells. The cross sections were then analyzed in the framework of the DWTA approach. The radius of ${}^{8}\mathrm{Be}$ was derived.

Study of 9 Be ( p , p n ) and 9 Be ( p , 2 p ) reactions at 70 MeV

The experiments have been performed with the Grenoble Isochronous Cyclotron beam, focused on a 4 mg/cm ~ thin foil target of natural silicon. The scattered deuterons are detected by two 3 mm thick Si(Li) detectors, mounted on the two rotable arms of a chamber of 65 cm internal diameter. The positioning accuracy of the arms is 0.05 ~ Each detector has an angular resolution of • ~ delimited by a 4 • 8 mm tanta lum diaphragm. A monitoring detector is fixed at 45 ~ and a Faraday cup collects the beam charge. The detectors are cooled to about 2 0 ~ Each detector is connected to a charge preamplifier which gives rise to an analogue channel and a logic channel. This logic channel used an antipile-eup circuit which eliminates the pile-up effects by cancelling the pulse arriving at interval of t ime less than 30 ~s. The spectra from the multichalmel analyser are stored on magnetic tapes and handled by a PD1)-9 computer. An example of the spectra obtained is given in Fig. I. The overall energy resolution is (I00--150) keV. The beam energy is measured with a (CD2) ~ thin foil target, by crossover techniques. The angular distributions of deuterons scattered from the ground state, the first 2+-state and the 6.88 MeV level are shown in Fig. 2 together with the optical model and DWBA calculations. The first excited level of 2ssi has been well explained by Hartree-Fock and HartreeFoek-Bogoliubov calculations (1) as a rotational state of the ground band. Some recent experiments and calculations suggested an oblate deformation (2.3). :For the 6.88 level, gamma-ray double and triple angular-correlation measurements (4) from the 2:Al(p, T)2sSi reaction let to the spin-3 assignment and suggested the od,t narity, supported by some transfer reactions, particularly the 27 Al(aiie, d)2ssi reaction (a). According to the Blair

Octupole excitation of the 6.88 level of 28 Si by deuteron inelastic scattering at 29.5 MeV

Publisher Summary The Grenoble variable energy cyclotron is equipped with a source giving vector- and tensor-polarized deuterons. This source is on the top of the cyclotron and the polarized beam is injected through a hole drilled in the upper pole piece. In a reference frame where the quantization axis is along the magnetic field, the beam polarization can be described by a vector-polarization parameter and a tensor-polarization parameter. They are related to the spherical tensor moments, defined in a reference frame with the quantization axis along the direction of the particle. The maximum theoretically achievable polarization for a beam is both vector- and tensor-polarized. The beam energy can be measured by crossover techniques with uncertainty of order of 200 keV. The given uncertainties include both systematic and statistical errors. When no error bar is given, the uncertainty is of the order of the dot size.

ASYMMETRY MEASUREMENTS IN THE ELASTIC SCATTERING OF POLARIZED DEUTERONS BY H AND 4He BETWEEN 20 AND 30 MeV

RESCATTERING EFFECTS IN THE $sup 2$H(p,2p)n AND $sup 2$H(p,pn)n REACTIONS INDUCED BY 20- TO 60-MeV PROTONS.

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Octupole excitation of the 6.88 level of 28 Si by deuteron inelastic scattering at 29.5 MeV

ASYMMETRY MEASUREMENTS IN THE ELASTIC SCATTERING OF POLARIZED DEUTERONS BY H AND 4He BETWEEN 20 AND 30 MeV

RESCATTERING EFFECTS IN THE $sup 2$H(p,2p)n AND $sup 2$H(p,pn)n REACTIONS INDUCED BY 20- TO 60-MeV PROTONS.