John Eades

Cryogenic Tunable Microwave Cavity at 13 GHz for Hyperfine Spectroscopy of Antiprotonic Helium (2005)

Barna, D, Caspers, Friedhelm, Eades, John, Gilg, H, Hayano, R S, Hori, Masaki, ...

For the precise measurement of the hyperfine structure of antiprotonic helium microwave radiation of 12.9 GHz frequency is needed, tunable over ±100 MHz. A cylindrical microwave cavity is used whose...

Cryogenic Tunable Microwave Cavity at 13 GHz for Hyperfine Spectroscopy of Antiprotonic Helium (2005)

Barna, D, Caspers, Friedhelm, Eades, John, Gilg, H, Hayano, R S, Hori, Masaki, ...

For the precise measurement of the hyperfine structure of antiprotonic helium microwave radiation of 12.9 GHz frequency is needed, tunable over ±100 MHz. A cylindrical microwave cavity is used whose...

Systematic study of the decay rates of antiprotonic helium states (2004)

Yamaguchi, H, Hayano, R S, Ishikawa, T, Sakaguchi, J, Widmann, E, Eades, John, ...

A systematic study of the decay rates of antiprotonic helium (\pbhef and \pbhet) at CERN AD (Antiproton Decelerator) has been made by a laser spectroscopic method. The decay rates of some of its...

Charm search in 19 GeV/c $\pi^{-}$p exclusive reactions (2004)

Ghidini, B, Navach, F, Dowell, J, Kenyon, I, Woodworth, P L, Müller, K, ...

Precise laser spectroscopy of the antiprotonic helium atom and CPT test on antiproton mass and charge (2003)

Yamaguchi, H, Eades, John, Hayano, R S, Hori, Masaki, Horváth, D, Ishikawa, T, ...

We have measured twelve transition frequencies of the antiprotonic helium atom (pbar-He+) with precisions of 0.1--0.2 ppm using a laser spectroscopic method. The agreement between the experiment and...

Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method (2002)

Widmann, E, Hayano, R S, Ishikawa, T, Sakaguchi, J, Tasaki, T, Yamaguchi, H, ...

Using a newly developed laser-microwave-laser resonance method, we observed a pair of microwave transitions between hyperfine levels of the $(n,L)=(37,35)$ state of antiprotonic helium. This...

Hyperfine Structure Measurements of Antiprotonic Helium and Antihydrogen (2001)

Widmann, E, Eades, John, Hayano, R S, Hori, Masaki, Horváth, D, Ishikawa, T, ...

This paper describes measurements of the hyperfine structure of two antiprotonic atoms that are planned at the Antiproton Decelerator (AD) at CERN. The first part deals with antiprotonic helium, a...

Hyperfine Structure Measurements of Antiprotonic Helium and Antihydrogen (2001)

Widmann, E, Eades, John, Hayano, R S, Hori, Masaki, Horváth, D, Ishikawa, T, ...

This paper describes measurements of the hyperfine structure of two antiprotonic atoms that are planned at the Antiproton Decelerator (AD) at CERN. The first part deals with antiprotonic helium, a...

Laser Measurements of the Density Shifts of Resonance Lines in Antiprotonic Helium Atoms and Stringent Constraint on the Antiproton Charge and Mass (1999)

Torii, H A, Hayano, R S, Hori, Masaki, Ishikawa, T, Morita, N, Kumakura, M, ...

Quenching of metastable states of antiprotonic helium atoms by collisions with H$_2$ molecules (1998)

Ketzer, B, Hartmann, F J, Von Egidy, T, Maierl, C, Pohl, R, Eades, John, ...

Laser resonance transitions between normally metastable states of antiprotonic helium atoms were induced making use of state dependent quenching effects caused by trace admixtures of \mbox{H$_2$}\ to...

Hydrogen-assisted laser-induced resonant transitions between metastable states of antiprotonic helium atoms (1997)

Ketzer, B, Hartmann, F J, Von Egidy, T, Maierl, C, Pohl, R, Eades, John, ...

Laser resonance transitions between normally metastable states of antiprotonic helium atoms were observed making use of state dependent quenching effects caused by small admixtures of \htwo\...

High-Precision Structural Studies of the Antiproton Helium Atom $\overline{p}^{4}He^+$ by Observing Laser Resonances with $\Delta v = \Delta (n-l-1) = 2$ (1996)

Yamazaki, T, Widmann, E, Eades, John, Kumakura, M, Morita, N, Torii, H A, ...

Very weak laser resonances of unfavoured transitions $(n,l) \rightarrow (n+1,l-1)$ have been observed in metastable \={p}$^4$He$^+$ atoms by using a pulsed antiproton beam. The observed wavelengths...

High-Precision Structural Studies of the Antiproton Helium Atom $\overline{p}^{4}He^+$ by Observing Laser Resonances with $\Delta v = \Delta (n-l-1) = 2$ (1996)

Yamazaki, T, Widmann, E, Eades, John, Kumakura, M, Morita, N, Torii, H A, ...

Very weak laser resonances of unfavoured transitions $(n,l) \rightarrow (n+1,l-1)$ have been observed in metastable \={p}$^4$He$^+$ atoms by using a pulsed antiproton beam. The observed wavelengths...

Antihydrogen production and precision experiments (1996)

Holzscheiter, M H, Bendiscioli, G, Bertin, A, Bollen, G, Bruschi, M, Cesar, C L, ...

Observation of double resonant laser induced transitions in the $v = n - l - 1 = 2$ metastable cascade of antiprotonic helium-4 atoms (1996)

Hayano, R S, Ishikawa, T, Tamura, H, Torii, H A, Hori, Masaki, Maas, F E, ...

A new laser-induced resonant transition in the $v=n-l-1=2$ metastable cascade of antiprotonic $^4$He atoms has been found by using a double resonance technique. This was done by setting the first...

Laser-induced resonant transitions in the v=n-l-1=2 and 3 metastable cascades of antiprotonic $^{3}He atoms (1995)

Torii, H A, Hori, Masaki, Ishikawa, T, Maas, F E, Hayano, R S, Morita, N, ...

Laser-induced resonant transitions in metastable antiprotonic ^3He atoms have been found. The observed transitions at wavelengths 593.388 \pm 0.001~nm and at 463.947 \pm 0.002~nm have been...

Effects of impurity atoms and molecules on the lifetime of antiprotonic helium atoms (1995)

Widmann, E, Sugai, I, Yamazaki, T, Hayano, R S, Iwasaki, M, Nakamura, S N, ...

Delayed annihilation time spectra of antiprotons (DATS) in room temperature helium gas have been studied as a function of the concentration of admixed noble gases (Ne, Ar, Kr, Xe) as well as...

Isotope Effects on Delayed Annihilation Time Spectra of Antiprotonic Helium Atoms in Low-Temperature Gas (1995)

Ketzer, B, Hartmann, F J, Daniel, H, Von Egidy, T, Niestroj, A, Schmid, S, ...

The delayed annihilation time spectra (DATS) of antiprotonic helium atoms have been studied in isotopically pure low temperature ^3He and ^4He gas at various densities. The DATS taken at 5.8~K and...

Phase and density dependence of the delayed annihilation of metastable antiprotonic helium atoms in gas, liquid and solid helium (1995)

Widmann, E, Sugai, I, Yamazaki, T, Hayano, R S, Iwasaki, M, Nakamura, S N, ...

Preliminary results on the anticyclotron at LEAR (1994)

Aschenauer, E C, Waldner, F, Torelli, G, Testera, G, Simons, L M, Poggiani, R, ...

Laser studies of the decay chain of metastable antiprotonic helium atoms (1994)

Hayano, R S, Maas, F E, Torii, H A, Morita, N, Kumakura, M, Yamazaki, T, ...

Antihydrogen physics (1994)

Charlton, M, Eades, John, Horváth, D, Hughes, R J, Zimmermann, C

Delayed annihilation of antiprotons in helium gas (1993)

Nakamura, S N, Hayano, R S, Iwasaki, M, Shigaki, K, Widmann, E, Yamazaki, T, ...

Photo- and hadro- production of $\phi$(1020), K$*$(892)$^{0}$ and $\overline{K}*$(892)$^{0}$ mesons in the energy range 65 to 175 GeV (1993)

Apsimon, R J, Bagdasaryan, L S, Gebert, F D, Atkinson, M, Baake, M, Barberis, D, ...

First observation of laser-induced resonant annihilation in metastable antiprotonic helium atoms (1993)

Morita, N, Kumakura, M, Yamazaki, T, Widmann, E, Masuda, H, Sugai, I, ...

Antihydrogen Workshop (1993)

Eades, John

A naturally occurring trap for antiprotons (1993)

Eades, John, Morita, N, Ito, T M, Ito, Y, Kawachi, A, Nakamura, S N, ...

Antiproton trapping in various helium media: report of the HELIUMTRAP experiment at LEAR (1993)

Widmann, E, Daniel, H, Eades, John, Von Egidy, T, Hartmann, F J, Hayano, R S, ...

Survival of antiprotons in helium media: an unusual antiprotonic atom/molecule (1992)

Yamazaki, T, Widmann, E, Hayano, R S, Iwasaki, M, Nakamura, S N, Shigaki, K, ...

Production of f$_{2}$(1270) and f$_{0}$(975) mesons by photons and hadrons of energy 65-175 GeV (1992)

Apsimon, R J, Atkinson, M, Baake, M, Bagdasaryan, L S, Barberis, D, Brodbeck, T J, ...

Preliminary results on the anticyclotron at LEAR: Rev (1992)

Aschenauer, E C, Cauz, D, De Cecco, P, Eades, John, Egger, J P, Elsener, K, ...

Comparison of photon and hadron induced production of $\varrho^{0}$ mesons in the energy range of 65 to 175 GeV (1991)

Apsimon, R J, Atkinson, M, Baake, M, Bagdasaryan, L S, Barberis, D, Brodbeck, T J, ...

Precision measurement of antiprotonic hydrogen and deuterium X-rays (1991)

Heitlinger, K, Bacher, R, Badertscher, A, Blüm, H P, Eades, John, Egger, J, ...

Ultra low energy antiproton physics and LEAR (1990)

Eades, John

Separation of minimum and higher twist in photoproduction (1990)

Apsimon, R J, Atkinson, M, Baake, M, Bagdasaryan, L S, Barberis, D, Brodbeck, T J, ...

A study of the point-like interactions of the photon using energy-flows in photo- and hadro- production for incident energies between 65 and 170 GeV (1990)

Apsimon, R J, Atkinson, M, Baake, M, Bagdasaryan, L S, Barberis, D, Brodbeck, T J, ...

Spin-parity analysis of the E meson centrally produced in the reactions pi+p --> pi+pK0$_{1}$K$\pm$pi$\mp$ and pp --> ppK0$_{1}$K$\pm$pi$\mp$ at 85 GeV/c (1990)

Palano, A, Armstrong, T A, Bloodworth, Ian J, Burns, A, Carney, J N, Eades, John, ...

Spin-parity analysis of the E meson centrally produced in the reactions pi+p --> pi+(K0$_{1}$K$\pm$K$\mp$)p and pp --> p(K0$_{1}$K$\pm$pi$\mp$)p at 85 GeV/c (1990)

Armstrong, T A, Bloodworth, Ian J, Burns, A, Carney, J N, Eades, John, French, Bernard R, ...

A Ring Imaging Cerenkov detector for the CERN OMEGA spectrometer (1990)

Apsimon, R J, Cowell, J H, Flower, P S, Freeston, K A, Hallewell, G D, Morris, J A G, ...

The design of the optical components and gas control systems of the CERN OMEGA Ring Imaging Cerenkov detector (1990)

Apsimon, R J, Cowell, J H, Flower, P S, Freeston, K A, Hallewell, G D, Morris, J A G, ...

Inclusive photoproduction of single charged particles at high p$_{T}$ (1990)

Apsimon, R J, Atkinson, M, Baake, M, Bagdasaryan, L S, Barberis, D, Brodbeck, T J, ...

Physics with ultra low energy antiprotons: the anticyclotron (1990)

Eades, John, Simons, L M, Lagomarsino, V

Deceleration in an anticyclotron as a means of producing very low energy antiprotons (1990)

Eades, John, Simons, L M

The OMEGA spectrometer Ring Imaging Cerenkov detector: recent detector modifications and event analysis (1990)

Apsimon, R J, Flower, P S, Hallewell, G D, Morris, J A G, Morris, J V, Nisbet, K, ...

Study of mesons produced centrally in the reaction pp --> pp + X0 and pi+p --> pi+p + X0 at 85 GeV/c (1990)

Palano, A, Agelopolous, A, Apostolakis, Alcibiades J, Armstrong, T A, Bloodworth, Ian J, Burns, A, ...

Results from a pi$^{-}$p slow proton trigger experiment at 12 GeV/c (1990)

Evangelista, C, Ghidini, B, Palano, A, Picciarelli, V, Zito, G, Bröring, J, ...

The slow proton trigger for the CERN OMEGA spectrometer (1990)

Ghidini, B, Palano, A, Zito, G, Bröring, J, Müller, K, Nellen, B, ...