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15 results on '"Rapisarda G"'

1. ANC experiments for nuclear astrophysics: The 26Si(p, γ)27P case.

Author

D'Agata, G., Kilic, A. I., Burjan, V., Mrázek, J., Glagolev, V., Kroha, V., Cassisa, A., Guardo, G. L., La Cognata, M., Lamia, L., Palmerini, S., Pizzone, R. G., Rapisarda, G. G., Romano, S., Sergi, M. L., Spartà, R., Spitaleri, C., and Tumino, A.

Subjects
NUCLEAR astrophysics, NUCLEAR reactions, NUCLEOSYNTHESIS, NUCLEAR physics, RADIATIVE capture
Abstract

The Asymptotic Normalization Coefficient (ANC) method has proven to be useful in retrieving the direct part of the radiative capture cross section for a number of reactions of astrophysical interest. In this work, the study of the 26Si(p, γ)27P reaction, studied via the ANC in its extension for mirror nuclei will be discussed. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Preface.

Author

Spitaleri, C., Lamia, L., Pizzone, R.G., Rapisarda, G., Sergi, M.L., and Rapisarda, G.G.

Subjects
ASTROPHYSICS, NUCLEAR physics
Published
2018
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3. Trojan Horse method and radioactive ion beams: study of18F(p,α)15O reaction at astrophysical energies

Author

Gulino, M., Cherubini, Silvio, Rapisarda, G. G., Kubono, S., Lamia, L., La Cognata, M., Yamaguchi, H., Hayakawa, S., Wakabayashi, Y., Iwasa, N., Kato, S., Komatsubara, H., Teranishi, T., Coc, A., De Sereville, N., Hammache, F., Spitaleri, C., BE Li BA, Natowitz, Jb, CSNSM AN, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Radioactive ion beams, History, Ion beam, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], 010308 nuclear & particles physics, Abundance (chemistry), Trojan horse, Nova (laser), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], 7. Clean energy, 01 natural sciences, Computer Science Applications, Education, Nuclear physics, Astrophysics - Solar and Stellar Astrophysics, 0103 physical sciences, 010306 general physics, Nuclear Experiment
Abstract

The Trojan Horse Method was applied for the first time to a Radioactive Ion Beam induced reaction to study the reaction $^{18}$F(p,$\alpha$)$^{15}$O via the three body reaction $^{18}$F(d,$\alpha$ $^{15}$O)n at the low energies relevant for astrophysics. The abundance of $^{18}$F in Nova explosions is an important issue for the understanding of this astrophysical phenomenon. For this reason it is necessary to study the nuclear reactions that produce or destroy $^{18}$F in Novae. $^{18}$F(p,$\alpha$)$^{15}$O is one of the main $^{18}$F destruction channels. Preliminary results are presented in this paper., Comment: Talk given by Marisa Gulino at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

Published
2013
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4. Light nuclear clusters to look into the bright stars.

Author

Tumino, A., Spitaleri, C., Cherubini, S., Gulino, M., La Cognata, M., Lamia, L., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., and Spartá, R.

Subjects
NUCLEAR astrophysics, CLUSTER theory (Nuclear physics), COULOMB potential, NUCLEAR cross sections, NUCLEAR energy, NUCLEAR physics
Abstract

Nuclear clusters play a key role in the Trojan Horse Method for Nuclear Astrophysics studies. The Trojan Horse Method is an indirect technique to determine the astrophysical S(E) factor at ultra-low energies, free of Coulomb suppression and electron screening effect. Clustering makes it possible to use a few-body approach to derive a simple relationship between the measured 2 → 3 cross section and that of the 2 → 2 cross section of interest for astrophysics. The basic features of the Trojan Horse Method will be discussed and some recent results will be presented. [ABSTRACT FROM AUTHOR]

Published
2012
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5. Pole approximation validation in the study of the 6Li(d,α)4He reaction.

Author

Pizzone, R. G., Spitaleri, C., Lamia, L., Burjan, V., Cherubini, S., Hons, Z., Kiss, G. G., Kroha, V., La Cognata, M., Li, C., Mrazek, J., Piskor, S., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., and Tumino, A.

Subjects
NUCLEAR physics, NUCLEAR reactions, PARTICLES (Nuclear physics), COULOMB functions, ASTROPHYSICS, QUASIPARTICLES, SYMMETRY (Physics)
Abstract

The Trojan Horse Method (THM) was applied to the 3He+6Li interaction in order to investigate the quasi-free 6Li(d,α)4He reaction. The experiment was performed at 17 MeV at the Cyclotron Institute of the Czech Academy of Science. The extracted 6Li(d,α)4He quasi-free cross-section was compared with the behavior of direct data. A good agreement between data sets shows up throughout the energy range investigated, providing a very important validity test of the pole approximation for the THM above the Coulomb barrier. [ABSTRACT FROM AUTHOR]

Published
2010
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6. Nuclear Proton-proton Elastic Scattering via the Trojan Horse Method.

Author

Tumino, A., Spitaleri, C., Mukhamedzhanov, A., Rapisarda, G. G., Campajola, L., Cherubini, S., Crucillá, V., Elekes, Z., Fülöp, Zs., Gialanella, L., Gulino, M., Gyürky, G., Kiss, G. G., La Cognata, M., Lamia, L., Ordine, A., Pizzone, R. G., Puglia, S. M. R., Romano, S., and Sergi, M. L.

Subjects
ELASTIC scattering of protons, NUCLEAR reactions, COULOMB excitation, NUCLEAR physics, NUCLEAR energy
Abstract

We present here an important test of the main feature of the Trojan Horse Method (THM), namely the suppression of Coulomb effects in the entrance channel due to off-energy-shell effects. This is done by measuring the THM p—p elastic scattering via the p+d→p+p+n reaction at 4.7 and 5 MeV, corresponding to a p—p relative energy ranging from 80 to 670 keV. In contrast to the on-energy-shell (OES) case, the extracted p-p cross section does not exhibit the Coulomb-nuclear interference minimum due to the suppression of the Coulomb amplitude. This is confirmed by the half-off-energy shell (HOES) calculations and strengthened by the agreement with the calculated OES nuclear cross sections. [ABSTRACT FROM AUTHOR]

Published
2009
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7. RECENT ASTROPHYSICAL APPLICATIONS OF THE TROJAN HORSE METHOD TO NUCLEAR ASTROPHYSICS.

Author

Spitaleri, C., Cherubini, S., Crucillá, V., Gulino, M., La Cognata, M., Lamia, L., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., Tumino, A., Tribble, R., Banu, A., Al-Abdullah, T., Fu, C., Goldberg, V., Mukhamedzhanov, A., Tabacaru, G., and Trache, L.

Subjects
NUCLEAR astrophysics, ASTROPHYSICS, NUCLEAR physics, PHYSICS
Abstract

The Trojan Horse Method (THM) is an unique indirect technique allowing to measure astrophysical rearrangement reactions down to astrophysical relevant energies. The basic principle and a review of the recent applications of the Trojan Horse Method are presented. The applications aiming to the extraction of the bare astrophysical Sb(E) for some two-body processes are discussed. [ABSTRACT FROM AUTHOR]

Published
2008
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8. New Advances in the Trojan Horse Method as an Indirect Approach to Nuclear Astrophysics.

Author

Tumino, A., Spitaleri, C., Cherubini, S., Gulino, M., La Cognata, M., Lamia, L., Pizzone, R., Puglia, S., Rapisarda, G., Romano, S., Sergi, M., and Spartà, R.

Subjects
NUCLEAR astrophysics, NUCLEAR cross sections, PLASMA physics, INDUSTRIAL energy consumption, HELICITY of nuclear particles, NUCLEAR physics
Abstract

With the introduction of the Trojan Horse Method, nuclear cross sections between charged particles at astrophysical energies can now be measured. Here the basic features of the method are recalled together with recent results relevant for Nuclear Astrophysics. New applications in connection with plasma physics and industrial energy production are discussed. [ABSTRACT FROM AUTHOR]

Published
2013
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9. Pole approximation in the quasi-free t + p scattering and the t( p, d) d reaction via the t + d interaction.

Author

La Cognata, M., Spitaleri, C., Cherubini, S., Gulino, M., Lamia, L., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., and Tumino, A.

Subjects
NUCLEON-nucleon scattering, NUCLEON-nucleon interactions, SCATTERING (Physics), KINEMATICS, COLLISIONS (Nuclear physics), PARTICLES (Nuclear physics), COULOMB potential, NUCLEAR physics
Abstract

The t( p, p) t and t( p, d) d channels have been investigated in an indirect way through the 2H( t, tp) n and 2H( t, dd) n three-body reactions performed at E t = 35.5 MeV in quasi-free kinematics. The agreement with direct data supports the pole approximation at energies above the Coulomb barrier. [ABSTRACT FROM AUTHOR]

Published
2008
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10. Proton-proton elastic scattering via the Trojan horse method.

Author

Tumino, A., Spitaleri, C., Mukhamedzhanov, A., Rapisarda, G. G., Blagus, S., Bogovać, M., Cherubini, S., Crucillá, V., Elekes, Z., Fülöp, Z., Gulino, M., Gyürky, G., Kiss, G., Miljanić, Dj., Milin, M., La Cognata, M., Lamia, L., Pizzone, R. G., Rendić, D., and Romano, S.

Subjects
SCATTERING (Physics), COLLISIONS (Nuclear physics), NUCLEAR physics, QUANTUM scattering, NUCLEON-nucleon scattering
Abstract

We address a successful indirect technique, the Trojan horse method, which allows one to measure the bare nucleus cross section for rearrangement reactions down to astrophysical energies. In particular, we consider here the application of the method to the p- p elastic scattering. This represents an important test of the main feature of the method, namely the suppression of Coulomb effects in the entrance channel due to off-energy-shell effects. In contrast to the on-energy-shell case, the extracted p- p cross section does not exhibit the Coulomb-nuclear interference minimum, as predicted by the half-off-energy shell calculations. This hypothesis is strengthened by the agreement between the Trojan horse p- p data and the calculated on-energy-shell n- n, n- p and nuclear p- p cross sections. [ABSTRACT FROM AUTHOR]

Published
2008
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11. Molecular structures in T = 1 states of 10B.

Author

Kuchera, A. N., Rogachev, G. V., Goldberg, V. Z., Johnson, E. D., Cherubini, S., Gulino, M., Cognata, M. La, Lamia, L., Romano, S., Miller, L. E., Pizzone, R. G., Rapisarda, G. G., Sergi, M. L., Spitaleri, C., Tribble, R. E., Trzaska, W. H., and Tumino, A.

Subjects
*MOLECULAR structure, *SPECTRUM analysis, *CELL nuclei, *NUCLEAR physics, *MONTE Carlo method
Abstract

Background: Multicenter (molecular) structures can play an important role in light nuclei. The highly deformed rotational band in 10Be with a bandhead at 6.179 MeV has been observed recently and suggested to have an exotic α:2n:α configuration. Purpose: Search for states with α:2n:α two-center molecular configurations in 10B that are analogous to the states with α:2n:α structure in 10Be. Methods: The T = 1 isobaric analog states in 10B were studied in the energy range of Ex = 8.7-12.1 MeV using the reaction ¹H(9Be, α)6Li*(T = 1, 0+, 3.56 MeV). An R-matrix analysis was used to extract parameters for the states observed in the (p,α) excitation function. Results: Five T = 1 states in 10B have been identified. The known 2+ and 3- states at 8.9 MeV have been observed and their partial widths have been measured. The spin parities and partial widths for three higher-lying states were determined. Conclusions: Our data support theoretical predictions that the 2+ state at 8.9 MeV (isobaric analog of the 7.54-MeV state in 10Be) is a highly clustered state and can be identified as a member of the α:2n:αrotational band. The next member of this band, the 4+ state, has not been found. A very broad 0+ state at 11 MeV that corresponds to pure α + 6Li(0+, T = 1) configuration is suggested and it might be related to similar structures found in 12C, 18O, 20Ne. [ABSTRACT FROM AUTHOR]

Published
2011
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12. Trojan horse particle invariance studied with the 6Li(d,α)4He and 7Li(p,α)4He reactions.

Author

Pizzone, R. G., Spitaleri, C., Lamia, L., Bertulani, C., Mukhamedzhanov, A., Blokhintsev, L., Burjan, V., Cherubini, S., Hons, Z., Kiss, G. G., Kroha, V., La Cognata, M., Li, C., Mrazek, J., Piskoř, Š., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., and Tumino, A.

Subjects
*TROJAN horse (Greek mythology), *CELL nuclei, *SYMMETRY (Physics), *BINARY number system, *NUCLEAR physics
Abstract

The Trojan horse nucleus invariance for the binary reaction cross section extracted from the Trojan horse reaction was tested using the quasifree ³He(6Li(α,α)H and ³He(7Li,αα)²H reactions. The cross sections for the 6Li(d,α)4He and 7Li(p,α)4He binary processes were extracted in the framework of the plane wave approximation. They are compared with direct behaviors as well as with cross sections extracted from previous indirect investigations of the same binary reactions using deuteron as the Trojan horse nucleus instead of ³He. The very good agreement confirms the applicability of the plane wave approximation which suggests the independence of the binary indirect cross section on the chosen Trojan horse nucleus, at least for the investigated cases. [ABSTRACT FROM AUTHOR]

Published
2011
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13. The α-decay of the Hoyle state in 12C: a new high- precision investigation

Author

L. Lamia, C. Agodi, A. Tumino, G. Spadaccini, A. Ordine, G. G. Rapisarda, G. D’ Agata, C. Spitaleri, S. Romano, Giuseppe Verde, Daniele Carbone, A. Cvetinović, S. M. R. Puglia, Manuela Cavallaro, R. G. Pizzone, Luis Acosta, Roberta Spartà, I. Lombardo, G. Santagati, L. Francalanza, Mariano Vigilante, D. Dell' Aquila, M. Gulino, G. L. Guardo, M. La Cognata, S. Cherubini, Francesco Cappuzzello, I. Indelicato, Spitaleri, C., Dell‘aquila, D., Lombardo, I., Verde, G., Vigilante, M., Acosta, L., Agodi, C., Cappuzzello, F., Carbone, D., Cavallaro, M., Cherubini, S., Cvetinovic, A., D‘agata, G., Francalanza, L., Guardo, G. L., Gulino, M., Indelicato, I., La Cognata, M., Lamia, L., Ordine, A., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Santagati, G., Spartà, R., Spadaccini, G., and Tumino, A.

Subjects
Physics, Light nucleus, 010308 nuclear & particles physics, Component (thermodynamics), QC1-999, State (functional analysis), Nuclear Structure, Nuclear Clustering, Light nuclei, 01 natural sciences, Nuclear physics, Reaction rate, Physics and Astronomy (all), Stars, Nucleosynthesis, 0103 physical sciences, Cluster (physics), 010306 general physics, Ground state
Abstract

The αdecay path of the Hoyle state in 12C (Ex = 7:654MeV) represents one ofthe most challenging questions of modern nuclear physics. Its knowledge can help in theunderstanding of cluster configurations in light nuclei and the possible existence of Bose-Einstein condensates in nuclei. In stars, it is involved in the so-called 3αprocess, wherethe 12C nucleosynthesis occurs. We studied the 14N(d; α2)12C(7:654) reaction at 10:5MeVincident energy to probe its direct decay component. We found, with a precision higherof a factor 5 than any other previous experiment, an almost total absence of direct decaysby-passing the ground state of 8Be. From our analysis, a new upper limit of such decayis found at 0:043% (95% C.L.). Astrophysical 3α process reaction rate calculations haveto be accordingly revised.

Published
2018

14. Investigation of the Hoyle state in$^{12}$C with a new hodoscope detector

Author

Daniele Carbone, A. Cvetinović, C. Agodi, A. Ordine, M De Luca, M. Cavallaro, Luis Acosta, Silvio Cherubini, I. Indelicato, G. Santagati, Roberta Spartà, M. La Cognata, G. G. Rapisarda, R. G. Pizzone, Giuseppe Verde, M. Gulino, Giuseppe D’Agata, Livio Lamia, Mariano Vigilante, C. Spitaleri, S. Romano, L. Francalanza, Francesco Cappuzzello, D Dell’Aquila, G. L. Guardo, S. M. R. Puglia, A. Tumino, Ivano Lombardo, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Dell'Aquila, D., Lombardo, I., Vigilante, M., De Luca, M., Acosta, L., Agodi, C., Cappuzzello, F., Carbone, D., Cavallaro, M., Cherubini, S., Cvetinovic, A., D'Agata, G., Francalanza, L., Guardo, G. L., Gulino, M., Indelicato, I., La Cognata, M., Lamia, L., Ordine, A., Pizzone, R., Puglia, S., Rapisarda, G., Romano, S., Santagati, G., Spartà, R., Spitaleri, C., Tumino, A., and Verde, G.

Subjects
Physics, History, 010308 nuclear & particles physics, Detector, Clustering phenomena, Decay mechanisms, Structure property, Silicon detectors, State (functional analysis), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Nuclear physics, Physics and Astronomy (all), Hodoscope, 0103 physical sciences, 010306 general physics
Abstract

International audience; The ${0}_{2}^{+}$ state in(12)C (7.654MeV, the Hoyle state) is important for the understanding of clustering phenomena in nuclei. The pronounced cluster nature of this state allows the triple-α process in stars with a reaction rate regulated by its structure properties. To precisely estimate the direct component in the 3α decay mechanism of the Hoyle state, we developed a new experiment using the(14)N(d,α)(12)C reaction at 10.5MeV. An anti-coincidence telescope was used to identify the α ejectiles leading the residual(12)C in the Hoyle state, while its decays in 3α were studied by means of a new hodoscope of silicon detectors, superOSCAR, placed in kinematical coincidence to fully reconstruct the events. Details of the experiment and preliminary results are discussed in the text.

Published
2017
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15. A new high-precision upper limit of direct α-decays from the Hoyle state in12C

Author

Giuseppe Verde, C. Spitaleri, Silvio Cherubini, S. Romano, G. Spadaccini, M. Gulino, Giuseppe D’Agata, Luis Acosta, G. L. Guardo, C. Agodi, D. Dell'Aquila, Livio Lamia, A. Tumino, G. Santagati, Roberta Spartà, Manuela Cavallaro, Daniele Carbone, A. Cvetinović, Mariano Vigilante, S. M. R. Puglia, I. Indelicato, Ivano Lombardo, M. La Cognata, Francesco Cappuzzello, R. G. Pizzone, A. Ordine, L. Francalanza, G. G. Rapisarda, Dell'Aquila, D., La Cognata, M., Lombardo, I., Verde, G., Vigilante, M., Acosta, L., Agodi, C., Cappuzzello, F., Carbone, D., Cavallaro, M., Cherubini, S., Cvetinovic, A., D'Agata, G., Francalanza, L., Guardo, G. L., Gulino, M., Indelicato, I., Lamia, L., Ordine, A., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Santagati, G., Spartà, R., Spadaccini, G., Spitaleri, C., Tumino, A., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, State (functional analysis), Nuclear Structure, Nuclear Clustering, Light nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Reaction rate, Stars, Physics and Astronomy (all), Nucleosynthesis, 0103 physical sciences, Cluster (physics), Incident energy, Limit (mathematics), 010306 general physics, Ground state
Abstract

International audience; The Hoyle state in 12C(Ex = 7.654MeV) is characterized by a pronounced 3α cluster configuration. It is involved in the so-called 3α process in stars, that is responsible of 12C nucleosynthesis. We studied the decay path of the Hoyle state by using the 14N(d, α2)12C(7.654) reaction at 10.5MeV incident energy. We found, with a precision higher of a factor 5 than any other previous experiment, an almost total absence of direct decays by-passing the ground state of 8Be. A new upper limit of such a decay width is placed at 0.043% (95% C.L.). Astrophysical 3α process reaction rate calculations have to be consequently revised.

Published
2017
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