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32 results on '"Fulop, Z. S."'

1. The 25Mg(p, gamma)26Al reactionat astrophysical energoes

Author

Strieder, F., Limata, B., Formicola, A., Imbriani, G., Junker, M, Bemmerer, D., Broggini, C., Caciolli, A., Costantini, H., Corvisiero, P., Di Leva, A., Elekes, Z., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Gyurky, G. y., Lemut, A., Marta, M., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Terrasi, F., and Trautvetter, H. P.

Subjects
nuclear astrophysics
Published
2012

2. First Direct Measurement of the 17O(p,g)8F Reaction Cross Section at Gamow Energies for Classical Novae

Author

Scott, D. A., Caciolli, A., Di Leva, A., Formicola, A., Aliotta, M., Anders, M., Bemmerer, D., Broggini, C., Campeggio, M., Corvisiero, Pietro, Elekes, Z., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, G., Junker, M., Laubenstein, M., Menegazzo, 5. R., Marta, M., Napolitani, E., Prati, Paolo, Rigato, V., Roca, 3. V., Somorjai, E., Salvo, C., Straniero, O., Strieder, F., Szucs, T., Terrasi, 9 F., and Trezzi, D.

Published
2012

3. The 14N( p,γ )15O reaction studied with a composite germanium detector

Author

Marta, M., Formicola, A., Bemmerer, D., Broggini, C., Caciolli, A., Corvisiero, Pietro, Costantini, Heide, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. Y., Imbriani, G., Junker, M., Lemut, Alberto, Limata, B., Mazzocchi, C., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., Somorjai, C. ROSSI ALVAREZ E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., and Vomiero, A.

Published
2011

4. The N-14(p,gamma)O-15 reaction studied with a composite germanium detector

Author

Marta, M., Formicola, A., Bemmerer, D., Broggni, C., Caciolli, A., Costantini, H., Corvisiero, P., Elekes, Z., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, G., Junker, M., Lemut, A., Limata, B., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Salvo, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., and Vomiero, A.

Subjects
NUCLEAR ASTROPHYSICS, STELLAR EVOLUTION
Published
2011

5. Constraining the S-factor of 15N(p,g)16O at Astrophysical Energies

Author

Leblanc, P. J., Imbriani, G., Gorres, G., Junker, M., Azuma, R., Beard, M., Bemmerer, D., Best, A., Broggini, C., Caciolli, A., Corvisiero, P., Costantini, H., Couder, M., Deboer, R., Elekes, Z., Falahat, S., Formicola, A., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Gyurky, G. y., Kappeler, F., Kontos, A., Kuntz, R., Leiste, H., Lemut, A., Li, Q., Limata, B., Marta, M., Mazzocchi, C., Menegazzo, R., O'Brien, S., Palumbo, A., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Samorjai, E., Stech, E., Straniero, O., Strieder, F., Tan, W., Terrasi, F., Trautvetter, H. P., Uberseder, E., Wiescher, M., Leblanc, P. J., Imbriani, Gianluca, Görres, J, Junker, M., Azuma, R., Beard, M., Bemmerer, D., Best, Andrea, Broggini, C, Caciolli, A, Corvisiero, P., Costantini, H., Couder, M., Deboer, R., 1 Elekes, Z., Falahat, S., Formicola, A., Fülp, Z, Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, G. y., Käppeler, K., Kontos, A., Kuntz, R., Leiste, H., Lemut, A., Li, Q., Limata, B., Marta, M., Mazzocchi, C., Menegazzo, R., O'Brien, S., Palumbo, A., Prati, P., Roca, Vincenzo, Rolfs, C., Rossi Alvarez, C., Somorjai, E., Stech, E., Straniero, O., Strieder, F., Tan, W., Terrasi, F., Trautvetter, H. P., Uberseder, E., and Wiescher, M.

Subjects
Experimental Nuclear Physic, Astrophysics::High Energy Astrophysical Phenomena, Radiative capture, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Astrophysic, Nuclear Experiment, Stellar hydrogen burning
Abstract

The 15N(p,g)16O reaction represents a break out reaction linking the first and second cycle of the CNO cycles redistributing the carbon and nitrogen abundances into the oxygen range. The reaction is dominated by two broad resonances at Ep = 338 keV and 1028 keV and a Direct Capture contribution to the ground state of 16O. Interference effects between these contributions in both the low energy region (Ep < 338 keV) and in between the two resonances (338, Comment: 15 pages, 9 figures

Published
2010

6. A new study of low-energy (p, gamma) resonances on Magnesium isotopes

Author

Limata, B., Strieder, F., Formicola, A., Imbriani, G., Junker, M., Becker, H. W., Bemmerer, D., Best, A., Bonetti, R., Broggni, C., Caciolli, A., Costantini, H., Corvisiero, P., Dileva, A., Elekes, Z., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Gyurky, G. y., Lemut, A., Marta, M., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Salvo, C., Somorjai, E., Straniero, O., Terrasi, F., and Trautvetter, H. P.

Subjects
Nuclear astrophysics
Published
2010

7. An actively vetoed Clover Gamma-detector for nuclear astrophysics at LUNA

Author

Szücs, T., Bemmerer, D., Broggini, C., Caciolli, A., Confortola, F., Corvisiero, Pietro, Elekes, Z., Formicola, A., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. Y., Imbriani, G., Junker, M., Lemut, Alberto, Marta, M., Mazzocchi, C., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, AND H. P.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

An escape-suppressed, composite high-purity germanium detector of the Clover type has been installed at the Laboratory for Underground Nuclear Astrophysics (LUNA) facility, deep underground in the Gran Sasso Laboratory, Italy. The laboratory gamma-ray background of the Clover detector has been studied underground at LUNA and, for comparison, also in an overground laboratory. Spectra have been recorded both for the single segments and for the virtual detector formed by online addition of all four segments. The effect of the escape-suppression shield has been studied as well. Despite their generally higher intrinsic background, escape-suppressed detectors are found to be well suited for underground nuclear astrophysics studies. As an example for the advantage of using a composite detector deep underground, the weak ground state branching of the Ep = 223 keV resonance in the 24Mg(p,gamma)25Al reaction is determined with improved precision.

Published
2010

8. Direct measurement of the 15N(p,γ)16O total cross section at novae energies

Author

Bemmerer, D., Caciolli, A., Costantini, H., Bonetti, R., Broggni, C., Confortola, F., Corvisiero, P., Elekes, Z., Formicola, A., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Gyurky, G. y., Junker, M., Limata, B., Marta, M., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., and Strieder, F.

Subjects
novae, nuclesynthesis, Nuclear Astrophysics
Published
2009

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

Author

Caciolli, A., Agostino, L., Bemmerer, D., Confortola, F., Costantini, Heide, Formicola, A., Gyurky, G. Y., Bezzon, P., Bonetti, R., Broggini, C., Corvisiero, Pietro, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Laubenstein, M., Lemut, Alberto, Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, AND H. P.

Published
2009

10. The 3He(4He,gamma)7Be at solar energies: the LUNA prompt-gamma experiment

Author

Costantini, Heide, Bemmerer, D., Formicola, F. CONFORTOLA A., Gyurky, G. Y., Bezzon, P., Bonetti, R., Broggini, C., Corvisiero, Pietro, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Laubenstein, M., Lemut, Alberto, Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, AND H. P.

Published
2008

11. Nuclear Astrophysics at LUNA: Status and Perspectives

Author

Prati, P., Bemmerer, D., Confortola, F., Conti, F., Costantini, H., Formicola, A., Gyurky, G. y., Bonetti, R., Broggni, C., Caciolli, A., Corvisiero, P., Elekes, Z., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Lemut, A., Limata, B., Lozza, V., Marta, M., Menegazzo, R., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, H. P.

Subjects
NUCLEAR ASTROPHYSICS
Published
2008

12. The 3He(alpha, gamma)7Be S-factor at solar energies: the prompt γ experiment at LUNA

Author

Costantini, H., Bemmerer, D., Confortola, F., Formicola, A., Gyurky, G. y., Bezzon, P., Bonetti, R., Broggni, C., Corvisiero, P., Elekes, Z., Fulop, Z. s., Gervino, Gianpiero, Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Lemut, A., Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, H. P.

Subjects
Nuclear Astrophysics
Published
2008

13. 3He(alfa,gamma)7Be cross section at low energy

Author

Gyurky, G. Y., Confortola, F., Costantini, Heide, Formicola, A., Bemmerer, D., Bonetti, R., Broggini, C., Corvisiero, Pietro, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Laubenstein, M., Lemut, Alberto, Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, AND H. P.

Published
2007

14. Astrophysical S-factor of the 3He(alfa,gamma)7Be reaction measured at low energy via prompt and delayed gamma emission

Author

Confortola, F., Bemmerer, D., Costantini, Heide, Formicola, A., Gyurky, G. Y., Bezzon, P., Bonetti, R., Broggini, C., Corvisiero, Pietro, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Laubenstein, M., Lemut, Alberto, Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, H. P.

Published
2007

16. Activation measurement of the 3He(alfa,gamma )7Be cross section at low energy

Author

Bemmerer, D., Confortola, F., Costantini, Heide, Formicola, A., Gyurky, G. Y., Bonetti, R., Broggini, C., Corvisiero, Pietro, Elekes, Z., Fulop, Z. S., Gervino, G., Guglielmetti, A., Gustavino, C., Imbriani, G., Junker, M., Laubenstein, M., Lemut, Alberto, Limata, B., Lozza, V., Marta, M., Menegazzo, R., Prati, Paolo, Roca, V., Rolfs, C., ROSSI ALVAREZ, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, AND H. P.

Published
2006

18. ANOMALOUSLY LONG LIFETIME OF 2+1 STATE OF 16C.

Author

IMAI, N., ONG, H. J., AOI, N., SAKURAI, H., DEMICHI, K., KAWASAKI, H., BABA, H., DOMBRADI, Z. S., ELEKES, Z., FUKUDA, N., FULOP, Z. S., GELBERG, A., GOMI, T., HASEGAWA, H., ISHIKAWA, K., IWASAKI, H., KANEKO, E., KANNO, S., KISHIDA, T., and KONDO, Y.

Subjects
NUCLEAR reactions, RADIOACTIVITY, MAGNETIC fields, NUCLEAR structure, X-ray diffraction
Published
2004

19. 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

20. First Direct Measurement of the ^{17}O(p,\gamma)^{18}F Reaction Cross-Section at Gamow Energies for Classical Novae

Author

D. A. Scott, A. Caciolli, A. Formicola, M. Aliotta, M. Anders, D. Bemmerer, C. Broggini, M. Campeggio, P. Corvisiero, Z. Elekes, Z.s. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G.y. Gyurky, M. Junker, M. Laubenstein, R. Menegazzo, M. Marta, E. Napolitani, P. Prati, V. Rigato, E. Somorjai, C. Salvo, O. Straniero, F. Strieder, T. Szus, F. Terrasi, D. Trezzi, DI LEVA, ANTONINO, IMBRIANI, GIANLUCA, ROCA, VINCENZO, D. A., Scott, A., Caciolli, DI LEVA, Antonino, A., Formicola, M., Aliotta, M., Ander, D., Bemmerer, C., Broggini, M., Campeggio, P., Corvisiero, Z., Eleke, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. y., Imbriani, Gianluca, M., Junker, M., Laubenstein, R., Menegazzo, M., Marta, E., Napolitani, P., Prati, V., Rigato, Roca, Vincenzo, E., Somorjai, C., Salvo, O., Straniero, F., Strieder, T., Szu, F., Terrasi, and D., Trezzi

Subjects
Nuclear astrophysic, Proton-capture reaction, Astrophysics - Solar and Stellar Astrophysics, Reaction rate, CNO cycle, Nuclear Experiment
Abstract

Classical novae are important contributors to the abundances of key isotopes, such as the radioactive ^{18}F, whose observation by satellite missions could provide constraints on nucleosynthesis models in novae. The ^{17}O(p,\gamma)^{18}F reaction plays a critical role in the synthesis of both oxygen and fluorine isotopes but its reaction rate is not well determined because of the lack of experimental data at energies relevant to novae explosions. In this study, the reaction cross section has been measured directly for the first time in a wide energy range Ecm = 200 - 370 keV appropriate to hydrogen burning in classical novae. In addition, the E=183 keV resonance strength, \omega \gamma=1.67\pm0.12 \mueV, has been measured with the highest precision to date. The uncertainty on the ^{17}O(p,\gamma)^{18}F reaction rate has been reduced by a factor of 4, thus leading to firmer constraints on accurate models of novae nucleosynthesis., Comment: accepted by Phys. Rev. Lett

Published
2012

21. The 14N( p,γ )15O reaction studied with a composite germanium detector

Author

M. Marta, A. Formicola, D. Bemmerer, C. Broggini, A. Caciolli, P. Corvisiero, H. Costantini, Z. Elekes, Z.s. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G.y. Gyurky, M. Junker, A. Lemut, B. Limata, C. Mazzocchi, R. Menegazzo, P. Prati, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. Trautvetter, A. Vomiero, IMBRIANI, GIANLUCA, ROCA, VINCENZO, M., Marta, A., Formicola, D., Bemmerer, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, Z., Eleke, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. y., Imbriani, Gianluca, M., Junker, A., Lemut, B., Limata, C., Mazzocchi, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, H. P., Trautvetter, and A., Vomiero

Subjects
Fisica Nucleare Sperimentale, Spettroscopia Gamma, Astrofisica Nucleare
Abstract

The rate of the carbon-nitrogen-oxygen (CNO) cycle of hydrogen burning is controlled by the 14N(p,γ )15O reaction. The reaction proceeds by capture to the ground states and several excited states in 15O. In order to obtain a reliable extrapolation of the excitation curve to astrophysical energy, fits in the R-matrix framework are needed. In an energy range that sensitively tests such fits, new cross-section data are reported here for the four major transitions in the 14N(p,γ )15O reaction. The experiment has been performed at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400-kV accelerator placed deep underground in the Gran Sasso facility in Italy. Using a composite germanium detector, summing corrections have been considerably reduced with respect to previous studies. The cross sections for capture to the ground state and to the 5181, 6172, and 6792 keV excited states in 15O have been determined at 359, 380, and 399 keV beam energy. In addition, the branching ratios for the decay of the 278-keV resonance have been remeasured.

Published
2011

22. An actively vetoed Clover gamma-detector for nuclear astrophysics at LUNA. Eur. Phys. J. A44(2010)513-519

Author

T. SZUCS, D. BEMMERER, C. BROGGINI, A. CACIOLLI, F. CONFORTOLA, P. CORVISIERO, Z. ELEKES, A. FORMICOLA, Z.S. FULOP, G. GERVINO, A. GUGLIELMETTI, C. GUSTAVINO, G.Y. GYURKY, G. IMBRIANI, M. JUNKER, A. LEMUT, M. MARTA, C. MAZZOCCHI, R. MENEGAZZO, P. PRATI, V. ROCA, C. ROLFS, C. ROSSI ALVAREZ, E. SOMORJAI, O. STRANIERO, F. STRIEDER, H. P. TRAUTVETTER, TERRASI, Filippo, T., Szuc, D., Bemmerer, C., Broggini, A., Caciolli, F., Confortola, P., Corvisiero, Z., Eleke, A., Formicola, Fulop, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. Y., G., Imbriani, M., Junker, A., Lemut, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter

Published
2010

23. Precision study of ground state capture in the 14N(p,g)15O reaction

Author

M. Marta, A. Formicola, Gy Gyurky, D. Bemmerer, C. Broggini, A. Caciolli, P. Corvisiero, H. Costantini, Z. Elekes, Z.s. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, M. Junker, R. Kunz, A. Lemut, C. Mazzocchi, R. Menegazzo, P. Prati, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. Trautvetter, IMBRIANI, GIANLUCA, LIMATA, BENEDICTA NORMANNA, ROCA, VINCENZO, ROMANO, MARIO, M., Marta, A., Formicola, Gy, Gyurky, D., Bemmerer, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, Z., Eleke, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Imbriani, Gianluca, M., Junker, R., Kunz, A., Lemut, Limata, BENEDICTA NORMANNA, C., Mazzocchi, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, Romano, Mario, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, and H. P., Trautvetter

Abstract

The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, 14N(p,γ )15O, which proceeds by capture to the ground and several excited states in 15O. Previous extrapolations for the ground state contribution disagreed by a factor 2, corresponding to 15% uncertainty in the total astrophysical S factor. At the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy, a new experiment on ground state capture has been carried out at 317.8, 334.4, and 353.3 keV center-of-mass energy. Systematic corrections have been reduced considerably with respect to previous studies by using a Clover detector and by adopting a relative analysis. The previous discrepancy has been resolved, and ground state capture no longer dominates the uncertainty of the total S factor.

Published
2008

24. Measurement of 25Mg(p,γ)26Al resonance strengths via gamma spectrometry

Author

Formicola, A., Best, A., Imbriani, G., Junker, M., Bemmerer, D., Bonetti, R., Broggini, C., Caciolli, A., Confortola, F., Corvisiero, P., Costantini, H., Elekes, Z., Fülöp, Z., Gervino, G., Guglielmetti, A., Gyürky, G., Gustavino, C., Lemut, A., Limata, B., Marta, M., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., A., Formicola, A., Best, G., Imbriani, M., Junker, D., Bemmerer, R., Bonetti, C., Broggini, A., Caciolli, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, Fulop, Z. S., G., Gervino, A., Guglielmetti, G., Gyurky, C., Gustavino, 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, and H. P., Trautvetter

Subjects
LUNA, Experiment, Nuclear Astrophysics, Resonance strengths
Abstract

The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determing the sources of interstellar 26Al. The predicted 26Al is too low compared to the observation, for a better understanding more accurate rates for the 25Mg(p,gamma)26Al reaction are required. The 25Mg(p,gamma)26Al reaction has been investigated at the resonances at Er= 745; 418; 374; 304 keV at Ruhr-Universität Bochum using a Tandem accelerator and a 4pi NaI detector. In addition the resonance at Er = 189 keV has been measured deep underground laboratory at Laboratori Nazionali del Gran Sasso, exploiting the strong suppression of cosmic background. This low resonance has been studied with the 400 kV LUNA accelerator and a HPGe detector. The preliminary results of the resonance strengths will be reported.

Published
2008

25. The 3He(α,γ)7Be S-factor at solar energies: the prompt &gamma experiment at LUNA

Author

H. COSTANTINI, D. BEMMERER, F. CONFORTOLA, A. FORMICOLA, G.Y. GYURKY, P. BEZZON, R. BONETTI, C. BROGGINI, P. CORVISIERO, Z. ELEKES, Z.S. FULOP, G. GERVINO, A. GUGLIELMETTI, C. GUSTAVINO, G. IMBRIANI, M. JUNKER, M. LAUBENSTEIN, A. LEMUT, B. LIMATA, V. LOZZA, M. MARTA, R. MENEGAZZO, P. PRATI, V. ROCA, C. ROLFS, C. ROSSI ALVAREZ, E. SOMORJAI, O. STRANIERO, F. STRIEDER, H. P. TRAUTVETTER, TERRASI, Filippo, H., Costantini, D., Bemmerer, F., Confortola, A., Formicola, Gyurky, G. Y., P., Bezzon, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fulop, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, V., Lozza, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter

Published
2008

26. Precision study of ground state capture in the 14N(p,γ)15O reaction

Author

Marta, M., Bemmerer, D., Bonetti, R., Broggini, C., Caciolli, A., Corvisiero, P., Confortola, F., Conti, E., Costantini, H., Elekes, Z., Formicola, A., Fülöp, Z., Gervino, G., Guglielmetti, A., Gyürky, G., Gustavino, C., Imbriani, G., Junker, M., Lemut, A., Limata, B., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, V., Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., M., Marta, A., Formicola, G., Gyurky, D., Bemmerer, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, Z., Eleke, Fulop, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, R., Kunz, A., Lemut, B., Limata, C., Mazzocchi, R., Menegazzo, P., Prati, V., Roca, C., Rolf, M., Romano, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, and A., Vomiero

Subjects
Astrophysics (astro-ph), FOS: Physical sciences, radiative capture, CNO cycle, Astrophysics, Gran Sasso, LUNA, R-matrix, solar neutrinos, underground, in-beam gamma-spectrometry, Clover detector, Nuclear astrophysics, Clover segmented detector, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, 14N(p,gamma)15O, which proceeds by capture to the ground and several excited states in 15O. Previous extrapolations for the ground state contribution disagreed by a factor 2, corresponding to 15% uncertainty in the total astrophysical S-factor. At the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy, a new experiment on ground state capture has been carried out at 317.8, 334.4, and 353.3 keV center-of-mass energy. Systematic corrections have been reduced considerably with respect to previous studies by using a Clover detector and by adopting a relative analysis. The previous discrepancy has been resolved, and ground state capture no longer dominates the uncertainty of the total S-factor., Phys. Rev. C, rapid comm., accepted

Published
2008

27. Astrophysical S factor of the 3He7Be reaction measured at low energy via detection of prompt and delayed gamma rays

Author

F. Confortola, D. Bemmerer, H. Costantini, A. Formicola, G.y. Gyurky, P. Bezzon, R. Bonetti, C. Broggini, P. Corvisiero, Z. Elekes, Z.s. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G. Imbriani, M. Junker, M. Laubenstein, A. Lemut, B. Limata, V. Lozza, M. Marta, R. Menegazzo, P. Prati, V. Roca, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, H. P. Trautvetter, TERRASI, Filippo, F., Confortola, D., Bemmerer, H., Costantini, A., Formicola, Gyurky, G. y., P., Bezzon, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, V., Lozza, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter

Published
2007

28. 3He)7Be cross section at low energies

Author

G.y. Gyurky, F. Confortola, H. Costantini, A. Formicola, D. Bemmerer, R. Bonetti, C. Broggini, P. Corvisiero, Z. Elekes, Z.s. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G. Imbriani, M. Junker, M. Laubenstein, A. Lemut, B. Limata, V. Lozza, M. Marta, R. Menegazzo, P. Prati, V. Roca, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, H. P. Trautvetter, TERRASI, Filippo, Gyurky, G. y., F., Confortola, H., Costantini, A., Formicola, D., Bemmerer, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, V., Lozza, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter

Published
2007

29. 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

30. 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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31. Decay of 7Be in metallic environment

Author

Z.S. FULOP, G.Y. GYURKY, E. SOMORJAIA, D. SCHURMANN, F. RAIOLA, F. STRIEDER, C. ROLFS, B. N. LIMATA, L. GIALANELLA, ROCA, VINCENZO, N. DECESARE, A. DONOFRIO, D. ROGALLA AND F. TERRASI, IMBRIANI, GIANLUCA, ROMANO, MARIO, Fulop, Z, Gyurky, Gy, Somorjai, E, Schurmann, D, Raiola, F, Strieder, F, Rolfs, C, DE CESARE, N, D'Onofrio, Antonio, Gialanella, L, Imbriani, G, Limata, B, Roca, V, Romano, M, Terrasi, Filippo, Fulop, Z. S., Gyurky, G. Y., E., Somorjaia, D., Schurmann, F., Raiola, F., Strieder, C., Rolf, B. N., Limata, L., Gialanella, Imbriani, Gianluca, Roca, Vincenzo, Romano, Mario, N., Decesare, A., Donofrio, and D. ROGALLA AND F., Terrasi

Published
2005

32. 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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