[en] Recent experimental measurements for the reaction pp → π⁺d up to about 1 GeV are reviewed. Extensive measurements of vector (iT₁₁) and tensor (t₂₀) deuteron polarization exist, as well as differential cross sections for the pion kinetic energies of 280 to 450 MeV. Spin correlation parameters are reviewed, as well as the analyzing power. 28 refs., 8 figs

[en] A satisfactory understanding of the 6-q system is necessary for a complete understanding of the short-range part of the NN interaction. Bag models and quark potential models predict 6-q states in the 2 to 3 GeV mass range. NNπ and NNππ are examples of 6-q states involving the same quark flavors as the NN system, search for which could be undertaken through inclusive spin-dependent measurements

No abstract available

No abstract available

[en] In a proposed SSC linac injector the Low-Energy Booster lattice painting scheme requires a 50-MHz microbunch structure with transverse and longitudinal normalized rms emittances of less than 0.45 π-mm-mrad and 1.7 x 10^-5 π·eV·s, respectively, at 600 MeV. A 50-MHz RFQ design does not meet the longitudinal emittance requirements; a 150-MHz RFQ can do so, but requires a chopping scheme that produces a clean 50-MHz beam structure without degrading emittance. We present an rf deflector-chopper conceptual design that converts a 150-MHz RFQ beam into a 50-MHz microbunch beam structure while matching transversely and longitudinally to a following 450-MHz DTL. Multiparticle simulation with 3-D space charge shows negligible emittance growth. Output beam emittances are factors of 3 below requirements; further acceleration to 600 MeV should produce only small additional growth. The chopper is 54 cm long, comprising an rf deflector, two rebunchers, five small permanent magnet quadrupoles, and a beam dump. Similar schemes could use a 200- or 250-MHz RFQ for even smaller longitudinal emittance. 6 refs., 5 figs., 2 tabs

[en] The polarization of neutrons produced from the reaction pd → anti n was measured at a laboratory angle of 20⁰ at an incident proton kinetic energy of 800 MeV. For the highest energy neutron peak at approx. 665 MeV, as well as for the broad pion production peak at approx. 325 MeV, the neutron polarization has been found to be approx. 0.20. The measured polarization for the quasielastic process has been found to be in good agreement with the free np analyzing power measurements. Such a polarized neutron beam, having a broad spectrum of momenta from 800 to 1300 MeV/c has been used at LAMPF for free np spin correlation measurements

[en] The accelerating structure for Spallation Neutron Source (SNS) consists of a radio-frequency-quadrupole-linac (RFQ), a drift-tube-linac (DTL), a coupled-cavity-drift-tube-linac (CCDTL), and a coupled-cavity-linac (CCL). The linac is operated at room temperature. The authors discuss the detailed design of linac which accelerates an H^- pulsed beam coming out from RFQ at 2.5 MeV to 1000 MeV. They show a detailed transition from 402.5 MHz DTL with a 4 βλ structure to a CCDTL operated at 805 MHz with a 12 βλ structure. After a discussion of overall feature of the linac, they present an end-to-end particle simulation using the new version of the PARMILA code for a beam starting from the RFQ entrance through the rest of the linac. At 1000 MeV, the beam is transported to a storage ring. The storage ring requires a large (±500-keV) energy spread. This is accomplished by operating the rf-phase in the last section of the linac so the particles are at the unstable fixed point of the separatrix. They present zero-current phase advance, beam size, and beam emittance along the entire linac

[en] The spin transfer parameters, K/sub NN/ and K/sub LL/ have been measured in p vector p → n vector X at 0⁰ and 800 MeV for neutron momenta between 700 and 1200 MeV/c. Peak values of K/sub NN/ and K/sub LL/ are -.3 +- .05 and -.5 +- .1, respectively

[en] The control of longitudinal emittance in an ion linear accelerator is important for minimizing both chromatic aberrations and beam halo. The root-mean-square (rms) longitudinal emittance growth can result from either the nonlinear rf focusing fields or the nonlinear space-charge fields. The authors will present conclusions based on numerical beam-dynamics studies for both the radio-frequency quadrupole (RFQ), and the drift-tube linac (DTL). The authors will discuss the scaling of longitudinal emittance produced during the adiabatic bunching in an RFQ and will show the benefits of ramped DTL accelerating field designs to maintain high longitudinal focusing strength with increasing particle energy. 15 refs., 8 figs

[en] Twenty individual papers from Volume II were prepared for the data base. The major topics include the CP violation working group, the muon working group, rare decays and hyperons, neutrino physics working group, nucleon/antinucleon working group, and exotic atoms working group. In addition to these papers, the volume contains concluding remarks, and talks from the February LAMPF II workshop