124689502
A POSSIBLE SPECTROMETER FOR ACCOMPLISHING A SECONDARY BEAM SURVEY AT NAL.
123565642
Dimuon Production by Neutrons
A very narrow resonance with a mass of 3.1 GeV/c2 is observed in the reaction n+Be→μ++μ-+X. The total cross section for this process, as well as its P⊥2 and x distribution, are given.
124083721
SOME ASPECTS OF TARGETING SYSTEMS FOR A SLOW EXTRACTED BEAM AT THE AGS.
123415460
Rationale for a Choice of Secondary Particle Beams at NAL
118824183
Study of lepton pairs from proton-nuclear interactions: search for intermediate bosons and lee-wick structure
The authors propose to observe lepton pairs emerging from high energy proton-nuclear collisions. Large effective mass pairs probe the hadronic electromagnetic structure. The continuum mass spectrum will be measured and any resonant structures in the mass range up to {approx}28 GeV will be detected with great sensitivity. The data provides a prediction, via Conserved Vector Current theory, for the production cross section for weak vector bosons and these are also sought in the mass range {approx} 8-28 GeV. They also propose an initial photon-electron beam survey at high transverse momentum which is also a W-search with good sensitivity.
53129380
Ground-water activation from the upcoming operation of MI40 beam absorber
During the course of normal operation, a particle accelerator can produce radionuclides in the adjacent soil and in the beam line elements through the interactions of accelerated particles and/or secondary particles produced in the beam absorbers, targets, and sometimes elsewhere through routine beam losses. The production and concentration of these radionuclides depends on the beam parameters such as energy, intensity, particle type, and target configuration. The radionuclides produced in the soil can potentially migrate to the ground water. Soil activation and migration to the ground water depends on the details of the local hydrogeology. Generally, very few places such as the beam stops, target stations, injection and extraction sectors can have high enough radiation fields to produce radionuclides in the soil outside the enclosures. During the design, construction, or an upgrade in the intensity of existing beams, measures are taken to minimize the production of activated soil. The only leachable radionuclides known to be produced in the Fermilab soil are {sup 3}H, {sup 7}Be , {sup 22}Na, {sup 45}Ca and {sup 54}Mn and it has been determined that only {sup 3}H, and {sup 22}Na, because of their longer half lives and greater leachabilities, may significantly impact ground water resources.In themore » past, Fermilab has developed and used the Single Resident Well Model (SRWM) to estimate the ground water activation. Recently, the Concentration Model (CM), a more realistic method which depends on the site hydrogeology has been developed to decide the shielding requirements of the high radiation sites, and to calculate the ground water activation and its subsequent migration to the aquifer. In this report, the concentration of radionuclide released to the surface waters and the aquifer around the MI40 beam absorber are calculated. Subsequently, the ultimate limit on the primary proton beam intensity to be aborted on the Main Injector beam absorber is determined.« less
123487894
The small angle tile calorimeter in the DELPHI experiment
Abstract The Small angle TIle Calorimeter (STIC) provides calorimetric coverage in the very forward region of the DELPHI experiment at the CERN LEP collider. The structure of the calorimeters, built with a so-called “shashlik” technique, gives a perfectly hermetic calorimeter and still allows for the insertion of tracking detectors within the sampling structure to measure the direction of the showering particle. A charged-particle veto system, composed of two scintillator layers, makes it possible to trigger on single photon events and provides e–γ separation. Results are presented from the extensive studies of these detectors in the CERN testbeams prior of installation and of the detector performance at LEP.
117135799
Physics with the MAC detector
New results, obtained during the previous year at the PEP colliding beam rings with the MAC detector at a center of mass energy of 29 GeV, are presented.
110793538
A silicon pad shower maximum detector for a "Shashlik" calorimeter
The structure of the calorimeters built with the "Shashlik" technique allows the insertion of tracking detectors within the sampling structure, in order to improve the accuracy in the determination of the showering particle direction and to enhance the e-/spl pi/ separation ability. The new luminosity monitor of the DELPHI detector at LEP was equipped with two planes of silicon pad detectors placed at a depth of 4 and 7.4 radiation lengths. A description of the silicon detectors is given, together with the results from the exposure to a test beam. >
119294334
A comment on estimating sensitivity to neutrino mass hierarchy in neutrino experiments
Recently it has been proposed, in the context of experiments designed to resolve the neutrino mass hierarchy, to use the average posterior probability of one of the hypotheses as a measure of sensitivity of future experiments. This has led to sensitivity estimates that are drastically lower than common conventions. We point to the fact that such estimates can be severely misleading: the probability that an experiment would actually produce a result similar to the average value can be in fact negligibly small. We emphasize again the simple relation between median significance and the likelihood ratio evaluated with the ``Asimov'' data set, which can be used to express experimental sensitivity in Bayesian terms as well.
128147551
Searches for the SM Higgs boson at LEP with s**(1//2) <= 189-GeV