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24 results on '"Bakalov D."'

1. Hyperfine structure and electric quadrupole transitions in the deuterium molecular ion

Author

Danev, P., Bakalov, D., Korobov, V. I., and Schiller, S.

Subjects
Physics, Atomic Physics (physics.atom-ph), Polyatomic ion, FOS: Physical sciences, Rotational–vibrational spectroscopy, 01 natural sciences, Homonuclear molecule, Physics - Atomic Physics, 010305 fluids & plasmas, Dipole, Deuterium, 0103 physical sciences, Quadrupole, Physics::Atomic Physics, Atomic physics, 010306 general physics, Spectroscopy, Hyperfine structure
Abstract

Molecular hydrogen ions are of metrological relevance due to the possibility of precise theoretical evaluation of their spectrum and of external-field-induced shifts. In homonuclear molecular ions the electric dipole $E1$ transitions are strongly suppressed, and of primary laser spectroscopy interest is the electric quadrupole ($E2$) transition spectrum. In continuation of previous work on the H$_2^+$ ion, we report here the results of the calculations of the hyperfine structure of the laser-induced electric quadrupole transitions between a large set of ro-vibrational states of D$_2^+$; the inaccuracies of previous evaluations have been corrected. The effects of the laser polarization are studied in detail. We show that the electric quadrupole moment of the deuteron can in principle be determined with low fractional uncertainty $(\simeq1\times10^{-4})$ by comparing the results presented here with future data from precision spectroscopy of D$_2^+$., Comment: 19 pages, 4 figures. Comparison with the available experimental data about the hyperfine structure of D2+ has been added in Section IIC; A new Section IIID has been added with a thorough analysis of the determination of the electric quadrupole moment of the deuteron from D2+ spectroscopy; A new Section IIIE has been added discussing further applications of the composite frequency method

Published
2021
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2. FAMU: study of the energy dependent transfer rate $\Lambda_{\mu p \rightarrow \mu O}$

Author

FAMU Collaboration, Mocchiutti, E., Bonvicini, V., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K. S., Guffanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, R., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L. P., Rossi, P. L., Zuffa, M., Cervi, T., De Bari, A., Menegolli, A., De Vecchi, C., Nardò, R., Rossella, M., Tomaselli, A., Colace, L., De Vincenzi, M., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., and Vacchi, A.

Subjects
Physics - Instrumentation and Detectors, Physics - Data Analysis, Statistics and Probability, Physics::Atomic Physics, Nuclear Experiment
Abstract

The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $\Delta E_{hfs}(\mu^-p)1S$. The physical process behind this experiment is the following: $\mu p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $\Delta E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $\mu p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $\mu Z$ formed by muon transfer $(\mu p) +Z \rightarrow (\mu Z)^*+p$, a reaction whose rate depends on the $\mu p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(\mu Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($\Lambda_{\mu p \rightarrow \mu O}$), precisely measured for the first time., Comment: 11 pages, 4 figures, published on Journal of Physics: Conference Series, proc. of International Conference on Precision Physics of Simple Atomic Systems - PSAS2018. arXiv admin note: text overlap with arXiv:1708.03172

Published
2018

3. FAMU: study of the energy dependent transfer rate $��_{��p \rightarrow ��O}$

Author

FAMU Collaboration, Mocchiutti, E., Bonvicini, V., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K. S., Guffanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, R., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L. P., Rossi, P. L., Zuffa, M., Cervi, T., De Bari, A., Menegolli, A., De Vecchi, C., Nard��, R., Rossella, M., Tomaselli, A., Colace, L., De Vincenzi, M., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., and Vacchi, A.

Subjects
FOS: Physical sciences, Physics::Atomic Physics, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Data Analysis, Statistics and Probability (physics.data-an)
Abstract

The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $��E_{hfs}(��^-p)1S$. The physical process behind this experiment is the following: $��p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $��E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $��p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $��Z$ formed by muon transfer $(��p) +Z \rightarrow (��Z)^*+p$, a reaction whose rate depends on the $��p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(��Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($��_{��p \rightarrow ��O}$), precisely measured for the first time., 11 pages, 4 figures, published on Journal of Physics: Conference Series, proc. of International Conference on Precision Physics of Simple Atomic Systems - PSAS2018. arXiv admin note: text overlap with arXiv:1708.03172

Published
2018
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4. The measurement of vacuum polarization: The PVLAS experiment

Author

Bakalov, D., Brandi, F., Cantatore, G., Carugno, G., Carusotto, S., Federico Della Valle, Riva, A., Gastaldi, U., Iacopini, E., Micossi, P., Milotti, E., Onofrio, R., Pengo, R., Perrone, F., Petrucci, G., Polacco, E., Rizzo, C., Ruoso, G., Zavattini, E., Zavattini, G., Bakalov, D, Brandi, F, Cantatore, Giovanni, Carugno, G, Carusotto, S, DELLA VALLE, Federico, DE RIVA, A, Gastaldi, U, Iacopini, E, Micossi, P, Milotti, Edoardo, Onofrio, R, Pengo, R, Perrone, F, Petrucci, G, Polacco, E, Rizzo, C, Ruoso, G, Zavattini, E, and Zavattini, G.

Published
1998

5. Magnetic Birefringence of Vacuum: the PVLAS Experiment

Author

PENGO R, BAKALOV D, GASTALDI U, PETRUCCI G, BIALOLENKER G, BRANDI F, POLACCO E, CANTATORE, GIOVANNI, MICOSSI P, MILOTTI, EDOARDO, RIZZO C, ZAVATTINI E, IACOPINI E, BREGANT M, RUOSO G, ZAVATTINI G., DELLA VALLE, FEDERICO, Pengo, R, Bakalov, D, Gastaldi, U, Petrucci, G, Bialolenker, G, Brandi, F, Polacco, E, Cantatore, Giovanni, DELLA VALLE, Federico, Micossi, P, Milotti, Edoardo, Rizzo, C, Zavattini, E, Iacopini, E, Bregant, M, Ruoso, G, and Zavattini, G.

Published
1998

6. Precision Spectroscopy of Molecular Hydrogen Ions: Towards Frequency Metrology of Particle Masses

Author

Roth, B., Koelemeij, J., Schiller, S., Hilico, L., Karr, J. -Ph., Korobov, V. I., and Bakalov, D.

Subjects
Atomic Physics (physics.atom-ph), Physics::Atomic and Molecular Clusters, FOS: Physical sciences, Physics::Atomic Physics, Physics::Chemical Physics, Physics - Atomic Physics
Abstract

We describe the current status of high-precision ab initio calculations of the spectra of molecular hydrogen ions (H_2^+ and HD^+) and of two experiments for vibrational spectroscopy. The perspectives for a comparison between theory and experiment at a level of 1 ppb are considered., 26 pages, 13 figures, 1 table, to appear in "Precision Physics of Simple Atomic Systems", Lecture Notes in Physics, Springer, 2007

Published
2006

8. Incidence of canine neoplasms - a retrospective histopathological study. IV. Oropharyngeal tumours

Author

Dinev, I., Borissov, I., and Bakalov, D.

Subjects
dogs, oropharyngeal tumours, oral neoplasms, neoplasms
Abstract

A histopathological study of 65 specimens from spontaneous tumour growths localized in the oropharyngeal region in dogs was performed at the Faculty of Veterinary Medicine, Trakia University - Stara Zagora. The tumours were classified according to the criteria of the World Health Organization. Twenty nine tumours (44.62%) were classified as epulides, 16 (24.62%) as malignant melanomas, 8 (12.31%) - as squamous cell carcinomas, 5 (7.69%) - as liposarcomas, 3 (4.62%) - as fibrosarcomas, 3 (4.62%) - as osteosarcomas and 1 (1.54 %) – as benign melanoma. The incidence of oral tumours depending on dog’s breed, gender and age was also studied.

Published
2003

9. Pharmacokinetics of amikacin and ampicillin in dogs following single administration and co-administration with flunixin meglumine in dogs

Author

Haritova, A., Pashov, D., and Bakalov, D.

Subjects
dogs, flunixin meglumine, amikacin, ampicillin, drug interactions, pharmacokinetics
Abstract

The pharmacokinetics of amikacin (AMK) and ampicillin (AMP) administered intravenously independently and after intravenous administration of flunixin meglumine (FM) in 3 female and 3 male dogs has been studied. After a single intravenous (iv) injection of AMP, the elimination half-life (t1/2), area volume of distribution (Vdarea) and total body clearance (ClB) were 1.41±0.09 h, 1.97±0.71 l/kg and 29.05±14.73 ml/kg.min, respectively. Under the influence of FM the values of Vdarea and ClB were 2.18±1.14 l/kg and 23.46±13.54 ml/kg.min, respectively. After a single oral (po) administration of AMP the t1/2 value, mean absorption time (MAT) and absolute bioavailability (Fabs) were 1.02±0.17 h, 1.23±0.34 h and 24.90±8.05 %, respectively. When AMP was co-administered with FM, there was tendency towards higher antibiotic plasma levels. The MAT value, t1/2 and Fabs were 1.16±0.57 h, 0.916±0.13 h and 77.65±57.5 %, respectively. After a single iv administration of AMK, t1/2 Vdarea and ClB were 2.28±0.11 h, 0.61±0.15 l/kg and 3.13±0.61 ml/kg.min, respectively. Under the influence of FM the respective values were 2.26±0.4 h, 0.65±0.25 l/kg and 2.78±0.58 ml/kg.min. The co-administration of FM (iv) and AMP (iv or po) or AMK (iv) does not bring to significant changes in antibiotics pharmacokinetics.

Published
2001

10. Changes in some hormonal parameters in halothane anaesthetized horses

Author

Dinev, D., Georgiev, P., Hubenov, H., Zlateva, N., and Bakalov, D.

Subjects
hormones, halothane anaesthesia, horses
Abstract

Experiments on six local breed halothane-anaesthtized horses were carried out. The schedule of anaesthesia included i.v. premedication with diazepam, followed by i.v. xylazine after 10 min. The induction was performed by ketamine hydrochloride. After the orotracheal intubation anaesthesia was maintained by 3-4 vol.% halothane. Its duration was 2.5 h, all horses were in dorsal recumbency and were breathing spontaneously. Blood for determination of adrenocorticotropic hormone (ACTH), thyrotropic hormone (TSH), cortisol, triiodo-thyronine (T3), thyroxine (T4) was sampled from V. jugularis ( catheterized beforhand ), prior to anaesthesia, immediately after the induction of anaesthesia, at hours 1 and 2.5 (end of anaesthesia). It was established that the activity of hypothalamus-pituitary gland chain increased after halothane anaesthesia. ACTH levels reached a peak between the induction and hour 1, afterwards they returned to normal values. Cortisol concentrations increased too from 12.8 ± 0.4 pg/ml at the beginning up to 46.5 ± 3.4 pg/ml at hour 1 and up to 27.4 ± 1.3 pg/ml at hour 2.5. Dynamics of T3 changes differed from that in T4. During the whole experimental period T3 increased although the rate of increase varied during the different stages. Changes in T4 levels were manifested by a bi-phasic curve. Compared to T3 dynamics they revealed a new rule from a qualitative point of view.

Published
1998

16. 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
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17. Measurement of the muon transfer rate from muonic hydrogen to oxygen in the range 70-336 K

Author

Massimiliano Clemenza, Miltcho B. Danailov, Dimitar Bakalov, M. Stoilov, D. Cirrincione, L. Stoychev, Luigi Moretti, A. de Bari, M. Rossella, L. Colace, Roberto Benocci, Livio Gianfrani, M. De Vincenzi, L. Tortora, K. S. Gadedjisso-Tossou, S. Monzani, Eugenio Fasci, L. P. Rignanese, E. Mocchiutti, A. Pullia, F. Fuschino, R. Mazza, M. Bonesini, Andrzej Adamczak, A. Sbrizzi, Valter Maggi, C. Pizzolotto, P. Danev, José J. Suárez-Vargas, A. Vacchi, E. Vallazza, C. De Vecchi, Giuseppe Baldazzi, Humberto Cabrera, Alessandro Menegolli, Joseph Niemela, M. Baruzzo, Roberta Ramponi, Claudio Labanti, K. Ishida, R. Bertoni, Gianluca Morgante, Pizzolotto C., Sbrizzi A., Adamczak A., Bakalov D., Baldazzi G., Baruzzo M., Benocci R., Bertoni R., Bonesini M., Cabrera H., Cirrincione D., Clemenza M., Colace L., Danailov M., Danev P., de Bari A., De Vecchi C., De Vincenzi M., Fasci E., Fuschino F., Gadedjisso-Tossou K.S., Gianfrani L., Ishida K., Labanti C., Maggi V., Mazza R., Menegolli A., Mocchiutti E., Monzani S., Moretti L., Morgante G., Niemela J., Pullia A., Ramponi R., Rignanese L.P., Rossella M., Stoilov M., Stoychev L., Suarez-Vargas J.J., Tortora L., Vallazza E., Vacchi A., Pizzolotto, C, Sbrizzi, A, Adamczak, A, Bakalov, D, Baldazzi, G, Baruzzo, M, Benocci, R, Bertoni, R, Bonesini, M, Cabrera, H, Cirrincione, D, Clemenza, M, Colace, L, Danailov, M, Danev, P, de Bari, A, De Vecchi, C, De Vincenzi, M, Fasci, E, Fuschino, F, Gadedjisso-Tossou, K, Gianfrani, L, Ishida, K, Labanti, C, Maggi, V, Mazza, R, Menegolli, A, Mocchiutti, E, Monzani, S, Moretti, L, Morgante, G, Niemela, J, Pullia, A, Ramponi, R, Rignanese, L, Rossella, M, Stoilov, M, Stoychev, L, Suarez-Vargas, J, Tortora, L, Vallazza, E, Vacchi, A, Pizzolotto, C., Sbrizzi, A., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., Benocci, R., Bertoni, R., Bonesini, M., Cabrera, H., Cirrincione, D., Clemenza, M., Colace, L., Danailov, M., Danev, P., de Bari, A., De Vecchi, C., De Vincenzi, M., Fasci, E., Fuschino, F., Gadedjisso-Tossou, K. S., Gianfrani, L., Ishida, K., Labanti, C., Maggi, V., Mazza, R., Menegolli, A., Mocchiutti, E., Monzani, S., Moretti, L., Morgante, G., Niemela, J., Pullia, A., Ramponi, R., Rignanese, L. P., Rossella, M., Stoilov, M., Stoychev, L., Suarez-Vargas, J. J., Tortora, L., Vallazza, E., and Vacchi, A.

Subjects
Atomic Physics (physics.atom-ph), LaBr, 3, (Ce), Muonic hydrogen, Muonic X-rays, Oxygen, Transfer rate, X-rays, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Physics - Atomic Physics, 010305 fluids & plasmas, X-ray, Transfer (computing), 0103 physical sciences, 010306 general physics, Exotic atom, Physics, Range (particle radiation), Muon, Muonic X-ray, chemistry, LaBr3(Ce), Atomic physics
Abstract

The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatures. The 2018 results confirm the temperature dependence of Λ p O observed in 2016 and sets firm ground for comparison with the theoretical predictions.

Published
2021
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18. First FAMU observation of muon transfer from μp atoms to higher-Z elements

Author

L. Tortora, A. Vacchi, L. Colace, Maurizio Bonesini, A. Tomaselli, M. Rossella, Anselmo Margotti, E. Vallazza, Claudio Labanti, D. Guffanti, G. Zampa, R. Mazza, A. Curioni, T. Cervi, P. Danev, R. Carbone, Germano Baldazzi, Ezio Previtali, Paolo Rossi, Roberto Benocci, R. Bertoni, M. Furini, K. S. Gadedjisso-Tossou, L. Stoychev, Miltcho B. Danailov, Dimitar Bakalov, Giovanni Baccolo, M. Stoilov, K. Ishida, F. Fuschino, E. Furlanetto, L. P. Rignanese, M. Moretti, Gianluca Morgante, R. Nardò, Massimiliano Nastasi, G. Campana, C. De Vecchi, F. Chignoli, M. De Vincenzi, I. D'Antone, Andrzej Adamczak, C. Pizzolotto, E. Mocchiutti, A. Iaciofano, S. Meneghini, F. Somma, Valter Maggi, M. Zuffa, Alessandro Menegolli, A. Rachevski, A. de Bari, M. Clemenza, V. Bonvicini, Joseph Niemela, Roberta Ramponi, Mocchiutti, E., Bonvicini, V., Carbone, R., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K.S., Guffanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, G., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L.P., Rossi, P.L., Zuffa, M., Cervi, T., Bari, A.D., Menegolli, A., Vecchi, C.D., Nardò, R., Rossella, M., Tomaselli, A., Colace, L., Vincenzi, M.D., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., Vacchi, A., Gadedjisso-Tossou, K. S., Baldazzi, Germano, Rignanese, L. P., Rossi, P. L., Bari, A. De, Vecchi, C. De, Vincenzi, M. De, Iaciofano, Alfredo, Mocchiutti, E, Bonvicini, V, Carbone, R, Danailov, M, Furlanetto, E, Gadedjisso-Tossou, K, Guffanti, D, Pizzolotto, C, Rachevski, A, Stoychev, L, Vallazza, E, Zampa, G, Niemela, J, Ishidaf, K, Adamczak, A, Baccolo, G, Benocci, R, Bertoni, R, Bonesini, M, Chignoli, F, Clemenza, M, Curioni, A, Maggi, V, Mazza, R, Moretti, M, Nastasi, M, Previtali, E, Bakalov, D, Danev, P, Stoilov, M, Baldazzi, G, Campana, G, D'Antone, I, Furini, M, Fuschino, F, Labanti, C, Margotti, A, Meneghini, S, Morgante, G, Rignanese, L, Rossi, P, Zuffa, M, Cervi, T, De Bari, A, Menegolli, A, De Vecchi, C, Nardò, R, Rossella, M, Tomaselli, A, Colace, L, De Vincenzi, M, Iaciofano, A, Somma, F, Tortora, L, and Vacchi, R

Subjects
X-ray detector, Pressurized ga, Ground state, chemistry.chemical_element, Charged particle, Measurements of, Atom, 01 natural sciences, Timing detectors, Nuclear physics, 0103 physical sciences, 010306 general physics, Instrumentation, Hyperfine structure, Mathematical Physics, Exotic atom, X rays, Hyperfine splitting, Physics, Kinetic, Argon, Muon, Rutherford appleton laboratorie, 010308 nuclear & particles physics, Muonic hydrogen, X-ray detectors, Transfer rates, X ray detector, Carbon, chemistry, Carbon dioxide, Timing detector, Excited state, Analysis and statistical methods, Physics::Accelerator Physics, X ray apparatu, Analysis and statistical method, Kinetic energy, Beam (structure), Muon transfer rate
Abstract

The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, U.K.). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited μp atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the μp currently under way. © 2018 The Author(s).

Published
2018

19. FAMU: study of the energy dependent transfer rate Λ μp → μO

Author

Roberto Benocci, F. Somma, M. Zuffa, C. D. Vecchi, Massimiliano Clemenza, Miltcho B. Danailov, Dimitar Bakalov, F. Fuschino, M. Stoilov, K. Ishida, Ezio Previtali, L. Stoychev, L. P. Rignanese, Roberta Ramponi, Alessandro Menegolli, C. Pizzolotto, Andrzej Adamczak, K. S. Gadedjisso-Tossou, R. Nardò, D. Guffaanti, A. Rachevski, A. Tomaselli, F. Chignoli, M. I. Moretti, Paolo Rossi, A. Iaciofano, M. Rossella, S. Meneghini, M. Furini, R. Mazza, T. Cervi, G. Zampa, Valter Maggi, I. D'Antone, A. D. Bari, Giovanni Baccolo, E. Mocchiutti, Maurizio Bonesini, Claudio Labanti, M. D. Vincenzi, Giuseppe Baldazzi, V. Bonvicini, E. Furlanetto, A. Curioni, E. Vallazza, Riccardo Campana, Joseph Niemela, Gianluca Morgante, L. Tortora, A. Vacchi, L. Colace, P. Danev, Anselmo Margotti, Massimiliano Nastasi, R. Bertoni, Mocchiutti, E., Bonvicini, V., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K. S., Guffaanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, R., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L. P., Rossi, P. L., Zuffa, M., Cervi, T., Bari, A. D., Menegolli, A., Vecchi, C. D., DI NARDO, Roberto, Rossella, M., Tomaselli, A., Colace, L., Vincenzi, M. D., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., Vacchi, A., Mocchiutti, E, Bonvicini, V, Danailov, M, Furlanetto, E, Gadedjisso-Tossou, K, Guffaanti, D, Pizzolotto, C, Rachevski, A, Stoychev, L, Vallazza, E, Zampa, G, Niemela, J, Ishida, K, Adamczak, A, Baccolo, G, Benocci, R, Bertoni, R, Bonesini, M, Chignoli, F, Clemenza, M, Curioni, A, Maggi, V, Mazza, R, Moretti, M, Nastasi, M, Previtali, E, Bakalov, D, Danev, P, Stoilov, M, Baldazzi, G, Campana, R, D’Antone, I, Furini, M, Fuschino, F, Labanti, C, Margotti, A, Meneghini, S, Morgante, G, Rignanese, L, Rossi, P, Zuffa, M, Cervi, T, Bari, A, Menegolli, A, Vecchi, C, Nardò, R, Rossella, M, Tomaselli, A, Colace, L, Vincenzi, M, Iaciofano, A, Somma, F, Tortora, L, Ramponi, R, Vacchi, A, Gadedjisso-Tossou, K.S., Rignanese, L.P., Rossi, P.L., Bari, A De, Vecchi, C De, Nardò, R., and Vincenzi, M De

Subjects
Energy dependent, Physics, History, muonic atom, Kinetics, Energy dependence, Time distribution, X rays, Muon transfer, Muonic Hydrogen, Muon transfer, Computer Science Applications, Education, Hyperfine splitting, Laser wavelength, Spectroscopic measurement, Transfer (computing), Atomic physic, Atomic physics, Physical proce, Kinetic energy, muonic hydrogen, Exotic atom
Abstract

The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen ΔE hfs (μ - p)1S. The physical process behind this experiment is the following: μp are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy ΔE hfs ≈ 0.182 eV, in subsequent collisions with the surrounding H 2 molecules, the μp is quickly de-excited and accelerated by ∼ 2/3 of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the μZ formed by muon transfer (μp) + Z → (μZ)∗ + p, a reaction whose rate depends on the μp kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the (μZ)∗ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen (Λ μp → μ0 ), precisely measured for the first time.

Published
2018
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20. Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization

Author

Massimiliano Clemenza, A. Rachevski, M. I. Moretti, A. de Bari, Miltcho B. Danailov, Claudio Labanti, Dimitar Bakalov, Joseph Niemela, L. P. Rignanese, A. Vacchi, M. Stoilov, Massimiliano Nastasi, A. Curioni, Andrzej Adamczak, K.S. Gadedjisso-Tossou, I. D'Antone, Giuseppe Baldazzi, E. Mocchiutti, V. Bonvicini, R. Bertoni, D. Iugovaz, Paolo Rossi, E. Vallazza, Giovanni Baccolo, Martino Marisaldi, Ezio Previtali, M. De Vincenzi, M. Zuffa, M. Furini, K. Ishida, R. Mazza, T. Cervi, Gianluca Morgante, F. Somma, C. De Vecchi, R. Nardò, F. Chignoli, A. Margotti, L. Tortora, A. Tomaselli, M. Rossella, Maurizio Bonesini, Roberta Ramponi, Alessandro Menegolli, A. Iaciofano, S. Meneghini, Valter Maggi, P. Danev, D. Guffanti, G. Zampa, R. Carbone, L. Colace, L. Stoychev, Riccardo Campana, F. Fuschino, Adamczak, A, Baccolo, G, Bakalov, D, Baldazzi, G, Bertoni, R, Bonesini, M, Bonvicini, V, Campana, G, Carbone, R, Cervi, T, Chignoli, F, Clemenza, M, Colace, L, Curioni, A, Danailov, M, Danev, P, D'Antone, I, Bari, A, Vecchi, C, Vincenzi, M, Furini, M, Fuschino, F, Gadedjisso-Tossou, K, Guffanti, D, Iaciofano, A, Ishida, K, Iugovaz, D, Labanti, C, Maggi, V, Margotti, A, Marisaldi, M, Mazza, R, Meneghini, S, Menegolli, A, Mocchiutti, E, Moretti, M, Morgante, G, Nardò, R, Nastasi, M, Niemela, J, Previtali, E, Ramponi, R, Rachevski, A, Rignanese, L, Rossella, M, Rossi, P, Somma, F, Stoilov, M, Stoychev, L, Tomaselli, A, Tortora, L, Vacchi, A, Vallazza, E, Zampa, G, Zuffa, M, ITA, USA, GBR, FRA, DEU, Colace, Lorenzo, Baccolo, G., Bakalov, D., Baldazzi, Giuseppe, Bertoni, R., Bonesini, M., Bonvicini, V., Campana, G., Carbone, R., Cervi, T., Chignoli, F., Clemenza, M., Colace, L., Curioni, A., Danailov, M., Danev, P., D'Antone, I., Bari, A. De, Vecchi, C. De, Vincenzi, M. De, Furini, M., Fuschino, Fabio, Gadedjisso Tossou, K. S., Guffanti, D., Iaciofano, A., Ishida, K., Iugovaz, D., Labanti, C., Maggi, V., Margotti, A., Marisaldi, M., Mazza, R., Meneghini, S., Menegolli, A., Mocchiutti, E., Moretti, M., Morgante, G., Nardò, R., Nastasi, M., Niemela, J., Previtali, E., Ramponi, R., Rachevski, A., Rignanese, LUIGI PIO, Rossella, M., Rossi, PIER LUCA, Somma, F., Stoilov, M., Stoychev, L., Tomaselli, A., Tortora, L., Vacchi, A., Vallazza, E., Zampa, G., and Zuffa, M.

Subjects
X-ray detector, Physics - Instrumentation and Detectors, Materials science, Physics::Instrumentation and Detectors, FOS: Physical sciences, 01 natural sciences, Nuclear physics, Hodoscope, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Instrumentation, Hyperfine structure, Mathematical Physics, Exotic atom, Muon, Spectrometers, 010308 nuclear & particles physics, Detector, Instrumentation and Detectors (physics.ins-det), Timing detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Ground state, Detection system, High purity germaniums, High-precision measurement, Hyperfine splittings, Lanthanum bromide, Muonic hydrogen, Pressurized gas, Pulsed muon beam, Beam (structure)
Abstract

The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the test were the characterization of the target, the hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope and X-rays detectors made with high purity Germanium and Lanthanum Bromide crystals. In this paper the experimental setup is described and the results of the detector characterization are presented., Comment: 22 pages, 14 figures, published and open access on JINST

Published
2016
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21. 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

22. Production and detection of dark matter candidates: the PVLAS experiment

Author

Bakalov, Dimitre, Cantatore, Giovanni, Carugno, Giovanni, Carusotto, Salvatore, Favaron, Paolo, DELLA VALLE, Federico, Gastaldi, Ugo, Iacopini, Emilio, Milotti, Edoardo, Onofrio, Roberto, Pengo, Ruggero, Perrone, Franco, Petrucci, Guido, Polacco, Erseo, Rizzo, Carlo, Ruoso, Giuseppe, Zavattini, Emilio, Zavattini, Guido, R.T. Jantzen, G. MacKeiser, R.J. Ruffini editors, Bakalov, D, Cantatore, Giovanni, Carugno, G, Carusotto, S, Favaron, P, DELLA VALLE, Federico, Gastaldi, U, Iacopini, E, Milotti, Edoardo, Onofrio, R, Pengo, R, Perrone, F, Petrucci, G, Polacco, E, Rizzo, C, Ruoso, G, Zavattini, E, and Zavattini, G.

Subjects
axions, dark matter, polarimetry, axion
Abstract

Production and Detection of Dark Matter Candidates: The PVLAS Experiment

Published
1997

23. Testing Quantum Electrodynamics: vacuum polarizability and Casimir forces

Author

Dimitre Bakalov, Guido Zavattini, G. Petrucci, Z. Fontana, E. Polacco, Giovanni Carugno, U. Gastaldi, Carlo Rizzo, Giuseppe Ruoso, E. Zavattini, S. Carusotto, F. Perrone, Roberto Onofrio, A. M. De Riva, R. Pengo, F. Della Valle, P. Favaron, Edoardo Milotti, Giovanni Cantatore, Bakalov, D, Cantatore, Giovanni, Carugno, G, Carusotto, S, DELLA VALLE, Federico, DE RIVA, A, Favaron, P, Fontana, Z, Gastaldi, U, Milotti, Edoardo, Onofrio, R, Pengo, R, Perrone, F, Petrucci, G, Polacco, E, Rizzo, C, Ruoso, G, Zavattini, E, and Zavattini, G.

Subjects
Physics, Casimir effect, Casimir pressure, QED vacuum, Photon, Vacuum energy, Quantum mechanics, Quantum electrodynamics, Vacuum state, Magnetic field, Quantization of the electromagnetic field
Abstract

Besides ruling the dynamics of electric charged particles and photons in the microscopic domain, quantization of the electromagnetic field gives also rise to macroscopic observable effects. We report on the status of two experiments we are carrying out at the INFN Legnaro Laboratories on macroscopic phenomena of the vacuum of quantum electrodynamics, the birefringence induced by a magnetic field and the Casimir forces.

Published
1996

24. Experimental method to detect the magnetic birefringence of vacuum

Author

Giuseppe Ruoso, R. Pengo, F. Della Valle, Edoardo Milotti, G. Petrucci, U. Gastaldi, A. M. De Riva, Dimitar Bakalov, E. Iacopini, Giovanni Carugno, S. Carusotto, E. Zavattini, F. Perrone, Roberto Onofrio, Fernando Brandi, E. Polacco, Guido Zavattini, Giovanni Cantatore, P. Micossi, Carlo Rizzo, Bakalov, D, Brandi, F, Cantatore, Giovanni, Carugno, G, Carusotto, S, DELLA VALLE, Federico, DE RIVA A., M, Gastaldi, U, Iacopini, E, Micossi, P, Milotti, Edoardo, Onofriod, R, Pengo, R, Perrone, F, Petrucci, G, Polacco, E, Rizzo, C, Ruoso, G, Zavattini, E, and Zavattini, G.

Subjects
Physics, QED vacuum, PVLAS, Optics, Birefringence, business.industry, Physics::Medical Physics, General Engineering, business, Atomic and Molecular Physics, and Optics, Beam (structure), Magnetic field
Abstract

We describe the principle and the status of the PVLAS experiment which is being assembled at INFN Laboratori Nazionali di Legnaro (Legnaro, Padua, Italy) to look for coherent effects, related to the QED vacuum structure, on the propagation of a polarized light beam in a strong magnetic field.

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