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Your search keyword '"Fulop, Z. S."' showing total 4 results
Start Over Author "Fulop, Z. S." Topic physics
4 results on '"Fulop, Z. S."'

1. Ultra-sensitive in-beam gamma-ray spectroscopy for nuclear astrophysics at LUNA

Author

M. Junker, R. Bonetti, A. Lemut, A. Formicola, Matthias Laubenstein, Z. Elekes, M. Marta, C. Rolfs, C. Gustavino, Gianluca Imbriani, Vincenzo Roca, P. Corvisiero, C. Rossi Alvarez, C. Mazzocchi, Paolo Prati, H. Costantini, B. Limata, Daniel Bemmerer, Carlo Broggini, Zs. Fülöp, Gy. Gyürky, G. Gervino, Antonio Caciolli, E. Somorjai, Oscar Straniero, Frank Strieder, Filippo Terrasi, A. Guglielmetti, R. Menegazzo, L. Agostino, F. Confortola, H. P. Trautvetter, A., Caciolli, L., Agostino, D., Bemmerer, R., Bonetti, C., Broggini, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, A., Formicola, Fulop, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. Y., G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, Caciolli, A., Agostino, L., Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Costantini, H., Elekes, Z., Formicola, A., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, Gianluca, Junker, M., Laubenstein, M., Lemut, A., Limata, B., Marta, M., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, Vincenzo, Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, H. P.

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, 3H, 3He, complex mixtures, and 4He-induced reactions, Nuclear physics, Nuclear physic, Nuclear astrophysics, γ-ray spectroscopy, Physics::Accelerator Physics, Gamma spectroscopy, Nuclear Experiment (nucl-ex), Spectroscopy, Nuclear Experiment, Beam (structure), Ultra sensitive
Abstract

Ultra-sensitive in-beam gamma-ray spectroscopy studies for nuclear astrophysics are performed at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator, deep underground in Italy's Gran Sasso laboratory. By virtue of a specially constructed passive shield, the laboratory gamma-ray background for E_\gamma < 3 MeV at LUNA has been reduced to levels comparable to those experienced in dedicated offline underground gamma-counting setups. The gamma-ray background induced by an incident alpha-beam has been studied. The data are used to evaluate the feasibility of sensitive in-beam experiments at LUNA and, by extension, at similar proposed facilities., Comment: accepted, Eur. Phys. J. A

Published
2009

2. CNO hydrogen burning studied deep underground

Author

C. Rolfs, Daniel Bemmerer, Gy. Gyürky, Carlo Broggini, C. Rossi Alvarez, R. Menegazzo, R. Bonetti, F. Schümann, H. P. Trautvetter, G. Gervino, B. Limata, Gianluca Imbriani, Oscar Straniero, Frank Strieder, Filippo Terrasi, João Cruz, A. P. Jesus, F. Confortola, M. Junker, A. Guglielmetti, Mario R. Romano, A. Formicola, Zs. Fülöp, A. Lemut, H. Costantini, Detlef Rogalla, C. Gustavino, Vincenzo Roca, Paolo Prati, E. Somorjai, P. Corvisiero, Bemmerer, D., Confortola, F., Lemut, A., Bonetti, R., Broggini, C., Corvisiero, P., Costantini, H., Cruz, J., Formicola, A., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, Gianluca, Jesus, A. P., Junker, M., Limata, B., Menegazzo, R., Prati, P., Roca, Vincenzo, Rogalla, D., Rolfs, C., Romano, Mario, Rossi Alvarez, C., Schuemann, F., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., D., Bemmerer, A., Lemut, R., Bonetti, C., Broggini, P., Corvisiero, H., Costantini, J., Cruz, A., Formicola, Z., Fulop, G., Gervino, A., Guglielmetti, C., Gustavino, G., Gyurky, G., Imbriani, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, V., Roca, D., Rogalla, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schu, Mann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter

Subjects
Physics, Nuclear and High Energy Physics, CNO cycle, Hydrogen, and linear accelerators - X- and γ-ray spectroscopy, collective, Extrapolation, chemistry.chemical_element, Alpha particle, Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic, Nuclear physics, chemistry, Excited state, Nuclear astrophysics, Nuclear fusion, Atomic physics, Ground state
Abstract

In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain) and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p,γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400kV accelerator in Italy's Gran Sasso laboratory measures the total cross section of the 14N(p,γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.

Published
2006

3. First measurement of the 14N(p,gamma)15O cross section down to 70 keV

Author

Carlo Broggini, Gianluca Imbriani, R. Bonetti, C. Rossi Alvarez, F. Confortola, Oscar Straniero, A. Guglielmetti, Filippo Terrasi, Daniel Bemmerer, Vincenzo Roca, João Cruz, B. Limata, Frank Strieder, Paolo Prati, G. Gervino, H. Costantini, P. Corvisiero, A. Formicola, A. P. Jesus, Zs. Fülöp, E. Somorjai, Gy. Gyürky, C. Rolfs, Detlef Rogalla, F. Schümann, C. Gustavino, Roberto Menegazzo, H. P. Trautvetter, M. Junker, Mario R. Romano, A. Lemut, A., Lemut, D., Bemmerer, F., Confortola, R., Bonetti, C., Broggini, Corvisiero, _. P., H., Costantini, J., Cruz, A., Formicola, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. y., Imbriani, Gianluca, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, C., Rossi Alvarez, F., Shumann, E., Somorjai, O., Straniero, F., Strieder, and F., Terrasi

Subjects
Nuclear and High Energy Physics, CNO cycle, Explosive material, Hydrogen, Cross section measurement, 14N(p, γ)15O, AGB stars, Hydrogen shell burning, Radiative capture, Underground nuclear astrophysics, Thermonuclear reaction, chemistry.chemical_element, FOS: Physical sciences, Astrophysics, Resonance (particle physics), γ)15O, Nuclear physics, Cross section (physics), 14N(p, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Detector, Astrophysics (astro-ph), Stars, chemistry, Atomic physics
Abstract

In stars with temperatures above 20 × 10 6 K , hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p, γ)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4π BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90 – 300 × 10 6 K , for the first time with negligible impact from extrapolations.

Published
2006
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4. Feasibility of low energy radiative capture experiments at the LUNA underground accelerator facility

Author

Gianluca Imbriani, Mario R. Romano, Daniel Bemmerer, Matthias Junker, Gy. Gyürky, Roberto Menegazzo, F. Confortola, A. P. Jesus, C. Rossi Alvarez, E. Somorjai, Oscar Straniero, C. Gustavino, C. Rolfs, H. P. Trautvetter, Filippo Terrasi, P. Corvisiero, João Cruz, F. Schümann, A. Guglielmetti, Paolo Prati, A. Lemut, G. Gervino, Detlef Rogalla, A. Formicola, B. Limata, Zs. Fülöp, R. Bonetti, Alberto Vomiero, H. Costantini, C. Broggini, Vincenzo Roca, F. Strieder, D., Bemmerer, F., Confortola, A., Lemut, R., Bonetti, C., Broggini, P., Corvisiero, H., Costantini, J., Cruz, A., Formicola, Flp, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, Gyrky, G. Y., G., Imbriani, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, V., Roca, D., Rogalla, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schmann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, A., Vomiero, Fülöp, Z. s., Gyürky, G. y., Imbriani, Gianluca, Roca, Vincenzo, Romano, Mario, C., Rossi Alvarez, F., Schümann, F., Terrasi, Fulop, Z. S., Gyurky, G. Y., F., Schumann, and AND A., Vomiero

Subjects
Nuclear reaction, Physics, Experimental Nuclear Physic, Nuclear and High Energy Physics, Proton, Gamma ray, chemistry.chemical_element, FOS: Physical sciences, Germanium, Bismuth germanate, underground laboratory, Nuclear physics, symbols.namesake, chemistry.chemical_compound, chemistry, symbols, Nuclear astrophysics, Nuclear Experiment (nucl-ex), Nuclear Astrophysic, Doppler effect, Nuclear Experiment, Beam (structure)
Abstract

The LUNA (Laboratory Underground for Nuclear Astrophysics) facility has been designed to study nuclear reactions of astrophysical interest. It is located deep underground in the Gran Sasso National Laboratory, Italy. Two electrostatic accelerators, with 50 and 400 kV maximum voltage, in combination with solid and gas target setups allowed to measure the total cross sections of the radiative capture reactions $^2$H(p,$\gamma$)3He and $^{14}$N(p,$\gamma$)$^{15}$O within their relevant Gamow peaks. We report on the gamma background in the Gran Sasso laboratory measured by germanium and bismuth germanate detectors, with and without an incident proton beam. A method to localize the sources of beam induced background using the Doppler shift of emitted gamma rays is presented. The feasibility of radiative capture studies at energies of astrophysical interest is discussed for several experimental scenarios., Comment: Submitted to Eur. Phys. J. A

Published
2005

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