Channeled Grating Spectra, Obtained in Successive by Barus C.

By Barus C.

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The cost of a frozen-spin target developed from scratch is $lM Cdn, but there is reasonable hope of us- ing many components from the present TRIUMF target. The cost of a new horizontal cryostat and superconducting coil for the holding field is ",$250 Cdn. The cost of the chambers themselves is ",$300 Cdn, and there is again reasonable hope that readout electronics may be taken from existing experiments. 7. Further Experiments With carbon replacing lead, and an extra layer of charged particle detectors, one has a polarimeter, capable (for example) of measuring R and A parameters in K+p elastic scattering [6].

The products of p interactions are taken to be 7r'S, K's, A's and A's according to the experimentally measured fractions. The antiproton channels included were: pN pN pN pN pN pN pN -+ -+ -+ -+ -+ -+ -+ pN pN7r AN7r AKN NAK 7r'S KK7r's The mesons thus produced are then propagated within the nucleus with no central potential (in contrast to the case for the nucleons) but with the reactions shown below occurring. 7rN 7rN 7rN 7rN 7rN 7rN -+ -+ -+ -+ -+ -+ 7rN 7rN* 7r~ 7r7r7r N wN 1]N 7rN 7rN 7rN 7rN 7rN -+ -+ -+ -+ -+ if>N KA KE K*A K*E KN KN KN KN -+ -+ -+ -+ KN 7rA 7rE KN The pion induced reactions are especially important since they deposit most of the energy and can produce strangeness as well.

7rN 7rN 7rN 7rN 7rN 7rN -+ -+ -+ -+ -+ -+ 7rN 7rN* 7r~ 7r7r7r N wN 1]N 7rN 7rN 7rN 7rN 7rN -+ -+ -+ -+ -+ if>N KA KE K*A K*E KN KN KN KN -+ -+ -+ -+ KN 7rA 7rE KN The pion induced reactions are especially important since they deposit most of the energy and can produce strangeness as well. 5 a: Figure 1: Branching ratios of the pion-nucleon interaction. tions is implemented by first deciding if there is to be a collision based on each pion-nucleon distance compared to the pion-nucleon total cross section in the laboratory.

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