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1. Experimental determination of the energy dependence of the rate of the muon transfer reaction from muonic hydrogen to oxygen for collision energies up to 0.1 eV

Author

M. Stoilov, A. Adamczak, D. Bakalov, P. Danev, E. Mocchiutti, C. Pizzolotto, G. Baldazzi, M. Baruzzo, R. Benocci, M. Bonesini, D. Cirrincione, M. Clemenza, F. Fuschino, A. D. Hillier, K. Ishida, P. J. C. King, A. Menegolli, S. Monzani, R. Ramponi, L. P. Rignanese, R. Sarkar, A. Sbrizzi, L. Tortora, E. Vallazza, A. Vacchi, Stoilov M., Adamczak A., Bakalov D., Danev P., Mocchiutti E., Pizzolotto C., Baldazzi G., Baruzzo M., Benocci R., Bonesini M., Cirrincione D., Clemenza M., Fuschino F., Hillier A.D., Ishida K., King P.J.C., Menegolli A., Monzani S., Ramponi R., Rignanese L.P., Sarkar R., Sbrizzi A., Tortora L., Vallazza E., and Vacchi A.

Subjects
Atomic, Molecular & Optical, Atomic Physics (physics.atom-ph), FOS: Physical sciences, Scattering of atoms, molecules, clusters & ion, Fine & hyperfine structure, Physics - Atomic Physics
Abstract

We report the first experimental determination of the collision-energy dependence of the muon transfer rate from the ground state of muonic hydrogen to oxygen at near-thermal energies. A sharp increase by nearly an order of magnitude in the energy range 0 - 70 meV was found that is not observed in other gases. The results set a reliable reference for quantum-mechanical calculations of low-energy processes with exotic atoms, and provide firm ground for the measurement of the hyperfine splitting in muonic hydrogen and the determination of the Zemach radius of the proton by the FAMU collaboration., 30 pages, 10 figures

Published
2023

2. The FAMU experiment: muonic hydrogen high precision spectroscopy studies

Author

Joseph Niemela, E. Vallazza, Alessandro Menegolli, Giuseppe Baldazzi, Eugenio Fasci, V. Bonvicini, F. Fuschino, E. Furlanetto, Massimiliano Clemenza, R. Mazza, Barbara Patrizi, R. Sarkar, M. Citossi, P. J. C. King, D. Cirrincione, L. Stoychev, Humberto Cabrera, D. Guffanti, R. Bertoni, C. De Vecchi, A. Pullia, A. de Bari, K. Ishida, M. Baruzzo, Roberta Ramponi, C. Xiao, K. S. Gadedjisso-Tossou, Angela Pirri, P. Danev, Miltcho B. Danailov, H. E. Roman, A. Vacchi, Dimitar Bakalov, M. Stoilov, Gianluca Morgante, L. Colace, M. Rossella, C. Pizzolotto, Livio Gianfrani, L. Tortora, Valter Maggi, Guido Toci, A. Sbrizzi, Luigi Moretti, M. Bonesini, E. Mocchiutti, Andrzej Adamczak, M. Vannini, J. J. Suárez-Vargas, Adrian D. Hillier, Roberto Benocci, G. Zampa, M. De Vincenzi, L. P. Rignanese, Claudio Labanti, F. Chignoli, Pizzolotto, C., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., Benocci, R., Bertoni, R., Bonesini, M., Bonvicini, V., Cabrera, H., Cirrincione, D., Citossi, M., Chignoli, F., Clemenza, M., Colace, L., Danailov, M., Danev, P., de Bari, A., De Vecchi, C., de Vincenzi, M., Fasci, E., Furlanetto, E., Fuschino, F., Gadedjisso-Tossou, K. S., Gianfrani, L., Guffanti, D., Hillier, A. D., Ishida, K., King, P. J. C., Labanti, C., Maggi, V., Mazza, R., Menegolli, A., Mocchiutti, E., Moretti, L., Morgante, G., Niemela, J., Patrizi, B., Pirri, A., Pullia, A., Ramponi, R., Rignanese, L. P., Roman, H. E., Rossella, M., Sarkar, R., Sbrizzi, A., Stoilov, M., Stoychev, L., Suarez-Vargas, J. J., Toci, G., Tortora, L., Vallazza, E., Vannini, M., Xiao, C., Zampa, G., Vacchi, A., Suárez-Vargas, J. J., Pizzolotto, C, Adamczak, A, Bakalov, D, Baldazzi, G, Baruzzo, M, Benocci, R, Bertoni, R, Bonesini, M, Bonvicini, V, Cabrera, H, Cirrincione, D, Citossi, M, Chignoli, F, Clemenza, M, Colace, L, Danailov, M, Danev, P, de Bari, A, De Vecchi, C, de Vincenzi, M, Fasci, E, Furlanetto, E, Fuschino, F, Gadedjisso-Tossou, K, Gianfrani, L, Guffanti, D, Hillier, A, Ishida, K, King, P, Labanti, C, Maggi, V, Mazza, R, Menegolli, A, Mocchiutti, E, Moretti, L, Morgante, G, Niemela, J, Patrizi, B, Pirri, A, Pullia, A, Ramponi, R, Rignanese, L, Roman, H, Rossella, M, Sarkar, R, Sbrizzi, A, Stoilov, M, Stoychev, L, Suarez-Vargas, J, Toci, G, Tortora, L, Vallazza, E, Vannini, M, Xiao, C, Zampa, G, and Vacchi, A

Subjects
X-ray detector, Physics, Nuclear and High Energy Physics, Muon, Proton, 010308 nuclear & particles physics, hyperfine splitting, Hadron, proton Zemach radiu, Radius, 01 natural sciences, Oxygen, Nuclear physics, Charge radius, Transfer rate, 0103 physical sciences, LaBr3:Ce scintillator, Physics::Atomic Physics, 010306 general physics, Ground state, Hyperfine structure, muonic hydrogen, Exotic atom
Abstract

The FAMU experiment aims to measure for the first time the hyperfine splitting of the muonic hydrogen ground state. From this measurement the proton Zemach radius can be derived and this will shed light on the determination of the proton charge radius. In this paper, we describe the scientific goal, the method and the detailed preparatory work. This includes the outcome of preliminary measurements, subsequent refined simulations and the evaluation of the expected results. The experimental setup being built for the measurement of the hyperfine splitting to be performed at the RAL laboratory muon facility is also described.

Published
2020
Full Text
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3. Imaging of the strain field around precipitate particles using transmission ion channeling

Author

Peter R. Wilshaw, P.J.M. Smulders, D. Meekeson, P. J. C. King, G.W. Grime, and Mark B. H. Breese

Subjects
Materials science, Copper silicide, Silicon, General Physics and Astronomy, chemistry.chemical_element, Crystal structure, MEV PROTONS, Molecular physics, Monocrystalline silicon, chemistry.chemical_compound, Planar, chemistry, Beam tilt, Lattice (order), Ion channeling, Physics::Accelerator Physics, SI, Atomic physics
Abstract

This paper shows ion channeling images of the strain field produced by precipitate particles in a crystal matrix. Images have been produced by mapping the energy of 3 MeV protons transmitted through a thinned silicon crystal containing colonies of copper silicide particles, with the incident beam at or close to planar channeling directions of the lattice. Features of the precipitate contrast observed as a function of beam tilt angle away from channeling alignment are qualitatively explained using a model based on symmetrical plane rotation of the crystal lattice around the colonies. © 1996 American Institute of Physics.

Published
1996

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