Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

T2K reports its first measurements of the parameters governing the disappearance of νµ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic νµ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector SuperKamiokande, 295 km away, where the νµ survival probability is expected to be minimal. Using a dataset corresponding to 4.01×10²⁰ protons on target, 34 fully contained µ-like events were observed. The best-fit oscillation parameters are sin²(θ₂₃) = 0.45 and |∆m^2_32| = 2.51 × 10⁻³ eV² with 68% confidence intervals of 0.38 - 0.64 and 2.26 - 2.80 ×10⁻³ eV² respectively. These results are in agreement with existing antineutrino parameter measurements and also with the νµ disappearance parameters measured by T2K.

Accelerator and detector physics at the Bern medical cyclotron and its beam transport line.

The cyclotron laboratory for radioisotope production and multi-disciplinary research at the Bern University Hospital (Inselspital) is based on an 18-MeV proton accelerator, equipped with a specifically conceived 6-m long external beam line, ending in a separate bunker. This facility allows performing daily positron emission tomography (PET) radioisotope production and research activities running in parallel. Some of the latest developments on accelerator and detector physics are reported. They encompass novel detectors for beam monitoring and studies of low current beams.

A lightweight pneumatic coring device : design and field test /

"September 1982."

Mechanics of pneumatic tires.

Mode of access: Internet.

Operating characteristics of pneumatic grain conveyors /

Cover title.

Analysis of decelerator, accelerator and shock cord propelled rebound sleds for evaluating air bag restraints. Final report.

Mode of access: Internet.

Temperature rise-times in pneumatic tires. Interim report.

Transportation Systems Center, Cambridge, Mass.

The rolling resistance of pneumatic tires. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Performance evaluation of the NHTSA advanced "S" series 50th percentile anthropomorphic dummy. Volume II - accelerator sled test data. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Discussion of focusing requirements for the Stanford two-mile accelerator /

AEC Contract AT(04-3)-400.

Some aspects of the prospective experimental use of the Stanford two-mile accelerator /

Eleven papers dealing with photon beams from the accelerator, use of hydrogen bubble chambers and spark chambers, a storage ring for 10-Bev muons, muon beams and -p scattering experiments, mass analysis of highenergy accelerator beams, the search for intermediate bosons and heavy leptons, particle yields arising from decay of short-lived intermediate particles, and conjectures on the effects of Regge poles on Drell processes are included. Separate abstracts were prepared for the eleven papers. (D.C.W.).

Transverse radiation shielding for the Stanford two-mile accelerator /

"AEC Contract AT(04-3)-400."

Misalignment and quadrupole error effects in a focusing system for the two-mile accelerator /

"AEC Contract AT(04-3)-400."

A pulsed bending magnet for the beam switchyard area of the Stanford two-mile linear electron accelerator /

"AEC Contract AT(04-3)-400."