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Measurements ofK L -meson and$ absorption c r o s s sections on carbon and copper in the region 1.0-3.3 GeV/c a r e presented.

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MANX is an experiment to prove that effective sixdimensional (6D) muon beam cooling can be achieved in a Helical Cooling Channel (HCC) using ionizationcooling with helical and solenoidal magnets in a novel configuration. The aim is to demonstrate that 6D muon beam cooling is understood well enough to plan intense neutrino factories and high-luminosity muon colliders. The experiment consists of the HCC magnet that envelops a liquid helium energy absorber, upstream and downstream instrumentation to measure the beam parameters before and after cooling, and emittance matching sections between the detectors and the HCC.Figure 1: Conceptual picture of the helical cooling channel (red) and the two emittance matching sections (blue). The helical solenoid magnets shown in red enclose the LHe ionization energy absorber, which is separated from the vacuum of the matching sections by thin Al windows. The beam is physically larger after cooling because it has much less momentum than the incoming beam; the normalized emittance has been reduced. The total length is 9.6 meters.

We present results on the production of jets and "jet-like" clusters in 800 GeV/c proton-nucleus (PA) collisions. Events with high values of transverse energy in the central kinematic region were selected for nuclear targets of H, Be, C, Cu and Pb. A jet-finding algorithm was used in analyzing the data. The A-dependence of the jet and di-jet cross sections was parameterized as Aa. The values of a for events with "jet-like" cluster pairs found by the algorithm without any additional kinematic cuts reach a plateau of approximately 1.5 at di-jet transverse energies >11 GeV. The collimation of observed "jet-like" clusters decreases with A, and the fragmentation is softer for heavier target nuclei. However, nuclear effects become less pronounced with the increasing cluster or cluster-pair transverse energy. We argue that the observed nuclear enhancement for the production of "jet-like" clusters is due to soft-scattering contributions to the heavy nuclei data. We show that the nuclear enhancement becomes consistent with a value of Q within 0.10 from unity once kinematic cuts enhancing contributions from hard scattering are applied to the data.

Abstractwe propose to build a large wire chamber magnetic spectrometer at NAL to measure multi-body forward-going hadronic systems produced by n's, K's and protons up to 80 GeV/c. Specific reactions will be isolated in order to study the sand t dependences of the cross sections for peripheral processes, search for new resonant states and attempt to measure nn and Kn inelastic scattering. We propose a physics program for the spectrometer which is initially limited to those processes easiest to measure and which nevertheless spans a large range of strong interaction problems. Technically, the proposed spectrometer is a relatively modest extension of presently operating systems in the 10-20 GeV/c region, and does not present a challenge of uncertain magnitude to construct. We propose to build a large magnetic spectrometer at NAL to measure forward-going hadronic systems between 20 and 80 BeV/c. The particle detectors are a series of wire spark chambers, appropriately distributed before and after the magnet to optimize measurement resolution and solid angle acceptance and a large downstream hodoscopic Cerenkov counter to distinguish ~'s, Kls and protons. Details of the spectrometer are described in Section II of this proposal.Spectrometers of this type already exist at CERN, (1) BNL(2) and SLAc(3) to study physics in beams of momentum up to ~20 GeV/c. They have shown themselves capable of recording highly interesting data in a rapid and efficient way for a large number of reactions. We are proposing to extend measurements of this type up to PLab = 80 aeV/c beam momentum at NAL both in order to study the dependence of various reaction mechanisms on beam momentum and momentum transfer and also to search for higher mass states which decay into multi-body systems.Although spectrometers of the type described here do not possess an intrinsic 4~ solid angle detection capability, due to the peripheral nature of high energy reactions such 4~ capability is approached and, in many cases, obtained in the rest frame of forward going systems. With detection of a recoil nucleon not required, the apparatus is almost entirely free of bias in momentum transfer. The type of physics studied with the spectrometer depends on the particular trigger used. With the aid of a downstream hodoscopic counter array which can select a predetermined 2 -4 number of particles, we will be able to study systems of 2, 3, 4, 5, etc., forward-going particles (see Section III B for a detailed discussion of the different trigger modes of operation). Table I contains a partial list of reactions which the spectro meter will be able to detect, grouped according to the beam particle and number of forward-going charged particles. In all cases only proton and neutron recoil reactions are shown. (KORo)n (K°1l:+1I:+)n (a) 3' triggers are 2-body events which are detected as 3-body because of the ~ dec~y.Reactions involving production of one or more 11: 0 mesons have intentionally been left out of the table because we feel that, while interesting in their own right,...