Design of the LAMPF Low-Energy Pion Channel

Burman, R. L.; Fulton, Robert L.; Jakobson, M. J.

doi:10.1016/0029-554x(75)90353-5

Cited by 36 publications

(6 citation statements)

References 4 publications

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“…The experiment was performed using the Low Energy Pion (LEP) Channel [6] at the Clinton P. Anderson Meson Physics Facility. The experimental apparatus used for all the measurements reported here is shown schematically in Fig.…”

Section: Methodsmentioning

confidence: 99%

π++d→p+pbelow 21 MeV

et al. 1993

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Absolute total and differential cross sections for the reaction sr+ + d -+ p+ p have been measured for pion energies from 3.7 to 20.5 MeV. A crossed-field velocity separator was used to enhance the purity of the pion beam, and a deuterated scintillator was used both as the target and to count the incident Aux. The total cross sections are 4.0 + 0.5, 4.4 + 0.2, 4.2 + 0.2, 4.2 + 0.2, and 4.8 + 0.3 mb for incident pion energies of 3.7, 5.0, 9.6, 15.2, and 20.5 MeV, respectively. The measured difFerential cross sections indicate the presence of p-wave strength at all energies studied and are in good agreement with recent measurements for the reaction n+ p~d + n' near threshold and a recent parametrization of the total and difFerential cross sections for the process. PACS number(s): 25.80.Ls, 25.10.+s

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Section: Methodsmentioning

confidence: 99%

π++d→p+pbelow 21 MeV

et al. 1993

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“…These were TRIUMF, in Vancouver, BC, Canada [45], and SIN [46] (now PSI) in Villigen, Switzerland. The competing technology was LAMPF [47] (now LANSCE) at Los Alamos, which was an 800 MeV linear accelerator. These two cyclotron facilities remain at the forefront of precision pion and muon studies to this day.…”

Section: Cyclotrons As Pion/muon Factoriesmentioning

confidence: 99%

Cyclotrons as Drivers for Precision Neutrino Measurements

Adelmann

Alonso

Barletta

et al. 2014

Advances in High Energy Physics

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As we enter the age of precision measurement in neutrino physics, improved flux sources are required. These must have a well-defined flavor content with energies in ranges where backgrounds are low and cross section knowledge is high. Very few sources of neutrinos can meet these requirements. However, pion/muon and isotope decay-at-rest sources qualify. The ideal drivers for decay-at-rest sources are cyclotron accelerators, which are compact and relatively inexpensive. This paper describes a scheme to produce decay-at-rest sources driven by such cyclotrons, developed within the DAEδALUS program. Examples of the value of the high precision beams for pursuing Beyond Standard Model interactions are reviewed. New results on a combined DAEδALUS-Hyper-K search for CP -violation that achieve errors on the mixing matrix parameter of 4 • to 12 • are presented.As can be seen, our current knowledge of the mixing matrix values is imprecise. The last entry, U e3 , was found to be non-zero just two years ago [18][19][20][21]. Our current state of measurement of the neutrino mixing matrix is analogous to that of the quark sector in 1995 [22], immediately after the discovery of the top quark. Unlike in the quark sector and its utilization of strong production, neutrino physicists are faced with the difficulty of both weak production and weak decay. Our route to precision therefore drives us to high-intensity sources coupled with ultra-large detectors.Even at this relatively early stage, the νSM has been remarkably predictive. For example, the |U e3 | element was found with the ∆m 2 atm splitting [23] as expected from the model. However, many open questions remain. Figure 1 shows a "hierarchy" of the mass states, after arranging the large and small splittings so that the orientation is consistent with what is seen in the quark sector. It is unclear if the neutrinos are oriented in a "normal hierarchy", as shown, or if the orientation is actually "inverted". Further, although the values of each of the splittings have been measured, the absolute mass of the neutrino is not known. We know there is a 3 × 3 matrix that describes the mixing but we don't know if there is CP -violation present as in the quark sector. There are also more exotic questions surrounding the neutrino and oscillations. For example, are there new forces appearing in neutrino interactions and oscillations? Do exotic non-interacting ("sterile") neutrinos mix with the known active flavors? Hints for all of these possibilities exist [24][25][26][27][28] with evidence extending up to 4σ. The next generation of neutrino experiments must investigate these results and clarify the present picture. If history is any indicator of the future, it is quite likely that these experiments, along with the more conventional ones within the νSM, will raise even more surprises.The next step in neutrino physics requires improved tools, in particular, sources from which the energy distribution and flavor content are very well-defined. The beam energy must be in a range where the neutr...

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“…The efficiency of the electromagnetic shower tracking algorithm was extracted independently from the 27.5 MeV SCX runs with LH 2 and CH 2 targets, after subtraction of the appropriate target-empty and 12 C target backgrounds from the data. The ratio of the number of events which survived all analyzer cuts to the number of events that satisfied less restrictive conditions for good MWPC hits inside predefined fiducial areas, was defined as the tracking efficiency ǫ t .…”

Section: π 0 Detection: Acceptance and Efficiencymentioning

confidence: 99%

“…The measurements were performed in the Low-Energy Pion (LEP) channel at the Clinton P. Anderson Meson Physics Facility (LAMPF) [12]. A weakly focusing 30 MeV π − beam tune was developed with 12 mr horizontal and vertical divergences, near-circular beam spot with a diameter of 9 mm FWHM at target location, momentum spread ∆p/p of 3%, and pion flux averaging 6•10 5 π − /sec.…”

mentioning

confidence: 99%

“…Absolute cross-calibration of chamber ionization counts against the number of pions in the beam was obtained through activation measurements of the 12 C(π − ,πN) 11 C reaction using ø70 mm × 3.2 mm disk-shaped plastic scintillator targets (PILOT B scintillator, 91.6% 12 C by weight) [13]. The 11 C activity of these targets, measured after exposures to the π − beam of typically 20 minute duration (one half-life of 11 C) was well above background counting rates.…”

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confidence: 99%

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