POLDER: a tensor polarimeter for intermediate energy deuterons

doi:10.1016/0168-9002(94)90588-6

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 346, Issue 3, 1 August 1994, Pages 527-543

https://doi.org/10.1016/0168-9002(94)90588-6 Get rights and content

Abstract

A new deuteron tensor polarimeter (POLDER), based upon the charge exchange reaction $^{1} H (→ d, 2p) n$ , has been constructed and calibrated in the energy range 175–500 MeV for all polarisation signals. The large figures of merit obtained make POLDER a unique instrument in this energy domain. The operation of this polarimeter has been checked in practice in a test experiment on $^{40} Ca (→ d, → d ′)^{40} Ca$ elastic scattering performed at E_d = 380 MeV.

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Vector and tensor analysing powers in deuteron-proton breakup reactions at intermediate energies
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Vector and tensor analysing powers of the $\vec{d} p \to (p p) n$ (charge-exchange) and $\vec{d} p \to (p n) p$ (non-charge-exchange) breakup reactions have been measured with the ANKE spectrometer at the COSY ring at a deuteron beam energy of 1170 MeV for small momentum transfers to the low excitation energy $(p p)$ or $(p n)$ systems. A quantitative understanding of the values of $A_{x x}$ and $A_{y y}$ for the charge-exchange reaction is provided by impulse approximation calculations. The data suggest that spin-flip isospin-flip transitions, which dominate the charge-exchange breakup of the deuteron, are also important in the non-charge-exchange reaction.
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Citation Excerpt :
Going to large values of momentum transfer, it has been pointed out [9] that, at some point, the two-photon exchange mechanism may become important. The necessity of verifying the presence and the importance of this mechanism from the data itself has been recently discussed [10]. In particular, such mechanism would induce vector polarization of the scattered deuteron, even in the scattering of unpolarized particles.
A general formalism for the calculation of the differential cross-section and polarization observables, for the process of deuteron electrodisintegration, is developed in the framework of relativistic impulse approximation. A detailed analysis of the general structure of the differential cross-section and polarization observables for the e⁻ + d → e⁻ + n + p reaction is derived, using the formalism of the structure functions. The obtained expressions have a general nature and they hold in the one-photon-exchange mechanism, assuming P-invariance of the hadron electromagnetic interaction. The model of relativistic impulse approximation is introduced and the final state interaction is taken into account by means of the unitarization of the helicity amplitudes. A detailed description of the unitarization procedure is also presented. Using different parametrizations of the deuteron wave functions, the following polarization observables are calculated in the kinematical region of quasi-elastic deuteron electrodisintegration: the asymmetry for the scattering of longitudinally polarized electrons on a polarized deuteron target, the proton and neutron polarizations (for longitudinally polarized electron beam or vector-polarized deuteron target). The sensitivity to the neutron electric form factor is also thoroughly investigated. The predictions of the model are compared with the results of recent polarization measurements and a good agreement with the existing experimental data has been obtained.
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POLDER: a tensor polarimeter for intermediate energy deuterons

Abstract

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth. A

Nucl. Phys. A

Nucl. Phys. A

Nucl. Instr. and Meth. A

Nucl. Phys. A

Nucl. Phys. A

Phys. Rev. Lett.

to appear in Phys. Rev. C

Nucl. Instr. and Meth. A

Nucl. Phys. A

LNS/AIRES Report # 92.05