78 results on '"Agodi, C"'
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2. Breakup of 8B+natZr at the sub-barrier energy of 26.5 MeV
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Palli K., Pakou A., Moro A. M., O’ Malley P. D., Acosta L., Sántzez-Bénitez A., Souliotis G., Aguilera E. F., Andrade E., Godos D., Sgouros O., Soukeras V., Agodi C., Bailey T. L., Bardayan D. W., Boomershine C., Brodeur M., Cappuzzello F., Caramichael S., Cavallaro M., Dede S., Dueñas J.A., Henning J., Lee K., Porter W.S., Rivero F., and von Seeger W.
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Physics ,QC1-999 - Abstract
In our systematic research on reactions with weakly bound nuclei at suband nearbarrier energies, we have studied the system 8B+natZr at the sub-barrier energy of 26.5 MeV. Our measurements, performed at the TriSol radioactive beam facility of the University of Notre Dame, include angular distributions of both elastic scattering and breakup, for the determination of the total reaction and breakup cross sections as well as the direct-to-total reaction cross section ratio. Preliminary results of the breakup analysis will be presented, supported by Continuum Discretized Coupling Channel calculations.
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- 2024
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3. Study of single-nucleon transfer reactions in the 18O+48Ti collision at 275 MeV
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Sgouros O., Cappuzzello F., Cavallaro M., Carbone D., Agodi C., Brischetto G.A., Calvo D., Lomelí E. R. Chávez, Ciraldo I., Cutuli M., De Gregorio G., Delaunay F., Djapo H., Eke C., Finocchiaro P., Fisichella M., Gargano A., Guazzelli M.A., Hacisalihoglu A., Linares R., Lubian J., Medina N. H., Moralles M., Oliveira J.R.B., Pakou A., Pandola L., Soukeras V., Souliotis G., Spatafora A., Torresi D., Yildirim A., and Zagatto V.A.B.
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Physics ,QC1-999 - Abstract
The study of single-nucleon transfer reactions for the 18O+48Ti system was pursued at the energy of 275 MeV as part of a more systematic study which is undertaken within the NUMEN and NURE experimental campaigns. The aim is to measure the complete set of available reaction network which are characterized by the same initial and final-state wavefunctions as the more suppressed double charge exchange reactions. Understanding the degree of competition between successive nucleon transfer and double charge exchange reactions is crucial for the description of the meson-exchange mechanism. In this respect, angular distribution measurements for one- and twonucleon transfer reactions for the 18O+48Ti system were carried out at theMAGNEX facility of INFN-LNS in Catania. An overview of the data analysis for the 48Ti(18O,19F)47Sc and 48Ti(18O,17O)49Ti reactions will be presented.
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- 2024
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4. Study of the reaction 70Zn (15 MeV/nucleon) + 64Ni with the MAGNEX spectrometer for the production of neutron-rich isotopes
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Koulouris S., Souliotis G. A., Cappuzzello F., Carbone D., Pakou A., Agodi C., Brischetto G., Calabrese S., Cavallaro M., Ciraldo I., Fasoula O., Klimo J., Palli K., Sgouros O., Soukeras V., Spatafora A., Torresi D., and Veselsky M.
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Physics ,QC1-999 - Abstract
We describe our efforts to study the production of neutron-rich isotopes from peripheral reactions of medium-mass heavy ions with the MAGNEX spectrometer at the INFN-LNS in Catania, Italy. Experimental data were obtained for the 70Zn+64Ni reaction at 15 MeV/nucleon. For the analysis of the data, we developed a new procedure for the reconstruction of both the atomic number Z and the ionic charge q of the ions, which is then followed by the identification of the mass. Preliminary results and the analysis plan will be discussed.
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- 2021
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5. Recent results for the one-proton transfer reaction in the 18O+48Ti collision at 275 MeV
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Sgouros O., Cavallaro M., Cappuzzello F., Carbone D., Agodi C., Altana C., Brischetto G. A., Burrello S., Calabrese S., Calvo D., Capirossi V., Chávez Lomelí E. R., Ciraldo I., Cutuli M., De Gregorio G., Delaunay F., Djapo H., Eke C., Finocchiaro P., Fisichella M., Foti A., Gargano A., Hacisalihoglu A., Iazzi F., La Fauci L., Linares R., Lubian J., Medina N. H., Moralles M., Oliveira J. R. B., Pakou A., Pandola L., Pinna F., Russo G., Guazzelli M. A., Soukeras V., Souliotis G., Spatafora A., Torresi D., Yildirim A., and Zagatto V.A. B.
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Physics ,QC1-999 - Abstract
The 18O+48Ti reaction was studied at the energy of 275 MeV for the first time under the NUMEN and NURE experimental campaigns with the aim to investigate the complete net of reaction channels potentially involved in the 48Ca→48Ti double charge exchange transition. Such a transition is of great interest because of its relevance to the extraction of 48Ca→48Ti double beta decay nuclear matrix element. The relevant experiment was carried out at the MAGNEX facility of INFN-LNS in Catania. Angular distribution measurements for the various reaction products were performed by using the MAGNEX large acceptance magnetic spectrometer. The present contribution is focused on the analysis of the one-proton transfer channel with emphasis on the particle identification technique and the estimation of background contaminations.
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- 2021
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6. Study of the 4He(4He,4He)4He* inelastic scattering at the MAGNEX facility
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Soukeras V., Cappuzzello F., Cavallaro M., Carbone D., Hacisalihoglu A., Fisichella M., Agodi C., Becker H.-W., Brischetto G. A., Calabrese S., Ciampi C., Cicerchia M., Cinausero M., Ciraldo I., D΄ Andrea M., Dell΄ Aquila D., Firat S., Frosin C., Hilcker M., La Fauci L., Lombardo I., Marchi T., Sgouros O., Spatafora A., Torresi D., Vigilante M., and Yildirim A.
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Physics ,QC1-999 - Abstract
The 4He(4He,4He)4He* inelastic scattering was revisited in a new coincidence measurement at the MAGNEX facility of Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali del Sud. The 4He + 4He → 4He + 4He* → 4He + 3H + 1H and 4He + 4He → 4He + 4He* → 4He + 3He + n reactions were measured simultaneously by detecting the 4He particles at the MAGNEX magnetic spectrometer in coincidence with the 3H and 3He at the OSCAR silicon telescope. The main concept of the experiment is described and the data reduction strategy is reported.
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- 2021
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7. Study of continuum excitation by light weakly bound projectiles on proton target
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Sgouros O., Soukeras V., Pakou A., Cappuzzello F., Acosta L., Agodi C., Alamanos N., Calabrese S., Carbone D., Cavallaro M., Foti A., Keeley N., Martel I., Rusek K., and Torresi D.
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Physics ,QC1-999 - Abstract
Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were performed at the MAGNEX facility of the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania, in the energy range of (2.3–5.4)AMeV. The breakup channel was identified and quantified adopting the algorithm MULTIP.Within this algorithm which is a Monte Carlo simulation code, the history of the breakup fragments can be tagged from the rest frame of the decay nucleus itself to the laboratory frame. Angular distribution data of both elastic scattering and breakup were analyzed under the same theoretical model and the influence of continuum on the elastic channel was investigated.
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- 2019
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8. The nuclear matrix elements of 0νββ decay and the NUMEN project at INFN-LNS
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Carbone D., Cappuzzello F., Agodi C., Cavallaro M., Acosta L., Bonanno D., Bongiovanni D., Boztosun I., Calabrese S., Calvo D., Chávez Lomelí E.R., Delaunay F., Deshmukh N., Finocchiaro P., Fisichella M., Foti A., Gallo G., Hacisalihoglu A., Iazzi F., Introzzi R., Lanzalone G., Linares R., Longhitano F., Lo Presti D., Medina N., Muoio A., Oliveira J.R.B., Pakou A., Pandola L., Pinna F., Reito S., Russo G., Santagati G., Sgouros O., Solakcı S.O., Soukeras V., Souliotis G., Spatafora A., Torresi D., Tudisco S., Yildirim A., and Zagatto V.A.B.
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Physics ,QC1-999 - Abstract
The goal of NUMEN project is to access experimentally driven information on Nuclear Matrix Elements (NME) involved in the neutrinoless double beta decay (0νββ), by high-accuracy measurements of the cross sections of Heavy Ion (HI) induced Double Charge Exchange (DCE) reactions. The knowledge of the nuclear matrix elements is crucial to infer the neutrino average masses from the possible measurement of the half-life of 00νββ decay and to compare experiments on different isotopes. In particular, the (18O, 18Ne) and (20Ne, 20O) reactions are performed as tools for β+β+ and β-β- decays, respectively. The experiments are performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania using the Superconducting Cyclotron (CS) to accelerate the beams and the MAGNEX magnetic spectrometer to detect the reaction products. The measured cross sections are very low, limiting the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. In order to make feasible a systematic study of all the candidate nuclei, a major upgrade of the LNS facility is foreseen to increase the experimental yield of about two orders of magnitude. To this purpose, frontier technologies are going to be developed for both the accelerator and the detection systems. In parallel, advanced theoretical models will be developed to extract the nuclear structure information from the measured cross sections.
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- 2018
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9. The α-decay of the Hoyle state in 12C: a new high-precision investigation
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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., Spitaleri C., and Tumino A.
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Physics ,QC1-999 - 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.
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- 2018
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10. Dynamical Dipole mode in heavy-ion fusion reactions
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Parascandolo C., Pierroutsakou D., Alba R., Del Zoppo A., Maiolino C., Santonocito D., Agodi C., Baran V., Boiano A., Colonna M., Coniglione R., De Filippo E., Di Toro M., Emanuele U., Farinon F., Guglielmetti A., La Commara M., Martin B., Mazzocchi C., Mazzocco M., Rizzo C., Romoli M., Signorini C., Silvestri R., Soramel F., Strano E., Torresi D., Trifirò A., and Trimarchi M.
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Physics ,QC1-999 - Abstract
The excitation of the Dynamical Dipole mode along the fusion path was investigated for the first time in the formation of a heavy compound nucleus in the A~190 mass region. The compound nucleus was formed at identical conditions of excitation energy and spin from two entrance channels having different charge asymmetry: the charge asymmetric 40Ca + 152Sm and the nearly charge symmetric 48Ca + 144Sm at Elab=11 and 10.1 MeV/nucleon, respectively. Both fusion–evaporation and fission events were studied simultaneously for the first time. The Dynamical Dipole mode excitation in the charge asymmetric channel was evidenced, in a model-independent way, by comparing the γ-ray multiplicity spectra and angular distributions of the two entrance channels with each other.
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- 2017
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11. A new high-precision upper limit of direct α-decays from the Hoyle state in 12C
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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., Spitaleri C., and Tumino A.
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Physics ,QC1-999 - Abstract
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.
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- 2017
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12. Dynamical Dipole mode in the 40,48 Ca +152,144Sm fusion reactions at 11 MeV/nucleon
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Parascandolo C., Pierroutsakou D., Alba R., Del Zoppo A., Maiolino C., Santonocito D., Agodi C., Baran V., Boiano A., Colonna M., Coniglione R., De Filippo E., Di Toro M., Emanuele U., Farinon F., Guglielmetti A., La Commara M., Martin B., Mazzocchi C., Mazzocco M., Rizzo C., Romoli M., Signorini C., Silvestri R., Soramel F., Strano E., Torresi D., Trifirò A., and Trimarchi M.
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Physics ,QC1-999 - Abstract
The excitation of the dynamical dipole mode along the fusion path was investigated in the formation of a heavy compound nucleus in the A=190 mass region. To form the compound nucleus, the 40Ca + 152Sm and 48Ca + 144Sm reactions were employed at Elab=11 and 10.1 MeV/nucleon, respectively. Both fusion–evaporation and fission events were studied simultaneously for the first time. Our results for evaporation and fission events (preliminary) show that the dynamical dipole mode survives in reactions involving heavier nuclei than those studied previously.
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- 2016
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13. Preliminary study of the 10Li nucleus via one-neutron transfer
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Cavallaro M., De Napoli M., Cappuzzello F., Agodi C., Bondí M., Carbone D., Cunsolo A., Davids B., Davinson T., Foti A., Galinski N., Kanungo R., Lenske H., Orrigo S.E.A., Ruiz C., and Sanetullaev A.
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Physics ,QC1-999 - Abstract
The structure of the 10Li unbound nucleus is a subject of large interest and its description is nowadays a matter of debate. We have investigated this system using the d(9Li,p)10 Li one-neutron transfer reaction at 100 MeV in inverse kinematics. The experiment was performed at the ISACII facility at TRIUMF laboratory. The excitation energy spectrum has been reconstructed by measuring the emitted protons at backward angles and the 9Li at forward angles.
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- 2016
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14. Extracting the cross section angular distributions for 15C high-energy resonance excited via the (18O,16O) two-neutron transfer reaction
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Carbone D., Agodi C., Cappuzzello F., Cavallaro M., Foti A., and Linares R.
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Physics ,QC1-999 - Abstract
The 13C(18O,16O)15C reaction has been studied at 84 MeV incident energy. The ejectiles have been momentum analized by the MAGNEX spectrometer and 15C excitation energy spectra have been obtained up to about 20 MeV. In the region above the two-neutron separation energy, a bump has been observed at 13.7 MeV. The extracted cross section angular distribution for this structure, obtained by using different models for background, displays a clear oscillating pattern, typical of resonant state of the residual nucleus.
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- 2016
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15. The nuclear matrix elements of 0νββ decay and the NUMEN project at INFN-LNS
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Cappuzzello F., Agodi C., Balestra F., Bijker R., Bonanno D., Bongiovanni D., Branchina V., Calabrese S., Calabretta L., Calanna A., Calvo D., Carbone D., Cavallaro M., Colonna M., Ferrero S., Foti A., Finocchiaro P., Giraudo G., Greco V., Iazzi F., Introzzi R., Lanzalone G., Lavagno A., Lo Presti D., Longhitano F., Muoio A., Pandola L., Rifuggiato D., Ruslan M.V., Santopinto E., Scaltrito L., Tudisco S., and Zagatto V.
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Physics ,QC1-999 - Abstract
An innovative technique to access the nuclear matrix elements entering the expression of the life time of the double beta decay by relevant cross sections measurements of double charge exchange reactions is proposed. A key aspect of the project is the use of the MAGNEX large acceptance magnetic spectrometer, for the detection of the ejectiles, and of the LNS K800 Superconducting Cyclotron (CS), for the acceleration of the required high resolution and low emittance heavyion beams, already in operation at INFN Laboratory Nazionali del Sud in Catania (Italy).
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- 2016
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16. Silicon carbide detectors study for NUMEN project
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Muoio A., Agodi C., Bonanno D.L., Bongiovanni D.G., Calabrese S., Calcagno L., Carbone D., Cavallaro M., Cappuzzello F., Foti A., Finocchiaro P., Lanzalone G., La Via F., Longhitano F., Lo Presti D., Pandola L., Privitera S., and Tudisco S.
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Physics ,QC1-999 - Abstract
In this contribution, we will illustrate the main results of the R&D activities related to the Silicon Carbide detectors associated with NUMEN project.
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- 2016
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17. Investigation of the Dynamical Dipole mode in the 192Pb mass region
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Parascandolo Concetta, Pierroutsakou D., Agodi C., Alba R., Baran V., Boiano A., Colonna M., Coniglione R., De Filippo E., Del Zoppo A., Di Toro M., Emanuele U., Farinon F., Guglielmetti A., La Commara M., Maiolino C., Martin B., Mazzocco M., Mazzocchi C., Rizzo C., Romoli M., Santonocito D., Signorini C., Silvestri R., Soramel F., Strano E., Torresi D., Trifirò A., and Trimarchi M.
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Physics ,QC1-999 - Abstract
The dynamical dipole mode was investigated in the mass region of the 192Pb compound nucleus, by using the 40Ca + 152Sm and 48Ca + 144Sm reactions at Elab=11 and 10.1 MeV/nucleon, respectively. Both fusion–evaporation and fission events were studied simultaneously for the first time. Our results show that the dynamical dipole mode survives in reactions involving heavier nuclei than those studied previously, however, its yield is lower than that expected within BNV calculations.
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- 2014
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18. Effects of configuration mixing in heavy-ion elastic scattering
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Cappuzzello F., Lubian J., Oliveira J. R. B., Agodi C., Bondí M., Carbone D., Cavallaro M., Chamon L. C., Cunsolo A., De Napoli M., Foti A., Nunes Garcia V., Gasques L. R., Gomes P. R. S., Linares R., Nicolosi D., Paes B., and Tropea S.
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Physics ,QC1-999 - Abstract
A theoretical study of the influence of configuration mixing on elastic scattering cross section is performed for the system 16O + 27Al at 100 MeV. A simple twostate model space, including the 27Al 5/2+ ground and 5/2+ excited state at 2.73 MeV, is used in the coupled channel equations. The results indicate that even a weak degree of mixing is able to sizeably affect the elastic cross section, determining mainly a damping of Fraunhofer oscillations, as observed in the experiments.
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- 2014
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19. Interference effects between direct and sequential processes in the (18O, 16O) reaction
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Cavallaro M., Cappuzzello F., Bondì M., Carbone D., Garcia V. N., Gargano A., Lenzi S.M., Lubian J., Agodi C., Azaiez F., De Napoli M., Foti A., Franchoo S., Linares R., Nicolosi D., Niikura M., Scarpaci J. A., and Tropea S.
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Physics ,QC1-999 - Abstract
The 12C(18O, 16O)14C reaction at 84 MeV has been studied at INFN-LNS laboratory using the MAGNEX magnetic spectrometer. High resolution energy spectra and cross-section angular distributions have been measured. DWBA calculations of both direct and sequential transfer to the 14C ground state show the important role of the interference between the two processes to describe the experimental data.
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- 2014
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20. Probing the symmetry energy at low density using observable from neck fragmentation
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De Filippo E., Acosta L., Agodi C., Amorini F., Auditore L., Baran V., Berceanu I., Cap T., Cardella G., Colonna M., Francalanza L., Geraci E., Gianì R., Grassi L., Grzeszczuk A., Guazzoni P., Han J., La Guidara E., Lanzalone G., Lombardo I., Maiolino C., Minniti T., Pagano A., Pagano E.V., Papa M., Piasecki E., Płaneta R., Pirrone S., Politi G., Pop A., Porto F., Quattrocchi L., Rizzo F., Rosato E., Russotto P., Siwek-Wilczyńska K., Skwira-Chalot I, Trifirò A., Trimarchi M., Verde G., Vigilante M., Wilczyński J., and Zetta L.
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Physics ,QC1-999 - Abstract
Semi-peripheral collisions of 64Ni + 124Sn in direct and inverse kinematics, at 35 A MeV incident energy, are studied to characterize the dynamical origin and align-ments properties of fragments emission at midrapidity. This emission is partly due to the fragmentation of a transient neck joining the projectile and target in the early stages of the reaction. Recently we exploited observable from neck fragmentation to constraint the density dependence of the symmetry energy. In this contribution we focus on the density evolution of the mid-rapidity source. An experimental survey is suggested to check if data are consistent with the formation of neck fragments in a dilute density region in contact with the projectile-like and target-like spectators at normal saturation density.
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- 2014
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21. New structures in the continuum of light nuclei populated by two-neutron transfer reactions
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Carbone D., Bonaccorso A., Cappuzzello F., Agodi C., Bondì M., Cavallaro M., Cunsolo A., De Napoli M., Foti A., Linares R., Nicolosi D., and Tropea S.
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Physics ,QC1-999 - Abstract
The 12C(18O,16O)14C reaction has been studied at 84 MeV incident energy. The ejectiles have been momentum analysed at forward angles by the MAGNEX magnetic spectrometer. The energy spectra were obtained up to about 20 MeV excitation energy. Calculations based on the removal of two uncorrelated neutrons from the projectile describe a significant part of the continuum observed in the energy spectra. In particular, a resonance of the residual nucleus dominates the region near the two-neutron emission threshold.
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- 2014
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22. Investigation of the disappearance of collective motion in nuclei of mass A~120-130
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Maiolino C., Santonocito D., Wang D., Blumenfeld Y., Agodi C., Alba R., Amorini F., Auditore L., Bellia G., Cardella G., Coniglione R., Delaunay F., De Filippo E., Del Zoppo A., Emanuele U., Finocchiaro P., Frascaria N., Hongmei F., Lima V., Monrozeau C., Migneco E., Papa M., Piattelli P., Pirrone S., Rizzo F., Sapienza P., Scarpaci J.A., Trifirò A., and Trimarchi M.
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Physics ,QC1-999 - Abstract
A study of hot Giant Dipole Resonance (GDR) in nuclei of mass A=120~130 in an excitation energy range from 150 to 330 MeV, where the GDR quenching is expected to arise, has been undertaken using the MEDEA multi-detector system. Hot nuclei were populated using complete and incomplete fusion reactions. The characterization of hot system was performed through the study of residue time of flight combined with the analysis of light charged energy spectra detected in coincidence. Gamma-ray energy spectra show an evolution of the GDR main features both in terms of width and multiplicity. Evidences of a saturation of gamma multiplicity appear at high excitation energy at variance with predictions of statistical model calculations. Gamma-ray energy spectra can been reproduced in a phenomenological way introducing in the statistical model a sharp suppression of the gamma-ray emission above E* = 240 MeV. A comparison of experimental data to models describing the GDR disappearance will be presented.
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- 2014
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23. Fragmentation cross sections at intermediate energies for hadrontherapy and space radiation protection
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De Napoli M., Agodi C., Bondi M., Cappuzzello F., Carbone D., Cavallaro M., Cirrone G.A.P., Cuttone G., Nicolosi D., Pandola L., Raciti G., Romano F., Sardina D., Scuderi V., and Tropea S.
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Physics ,QC1-999 - Abstract
Nuclear fragmentation studies, historically driven by the interest of the nuclear physicists, are nowadays the subject of great attention for the hadrontherapy and the space radiation protection communities. In both fields, fragmentation cross sections are needed to predict the effects of the ion nuclear interactions within the patient’s and the astronaut’s body. Indeed, the the Monte Carlo codes used in planning tumor treatments and space missions must be tuned and validated by experimental data. However, only a limited set of fragmentation cross sections are available in literature, especially at Fermi energies. Therefore we have studied the production of secondary fragments in the 12C+12C and 12C+ 197Au reactions at 62 AMeV. Some of the measured cross sections are presented in this work.
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- 2014
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24. Use of fragmentation beams at LNS with CHIMERA detector
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Gianí R., Francalanza L., DeFilippo E., Chatterjiee M. B., Buscemi M., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Acosta L., Cardella G., Grassi L., La Guidara E., Lanzalone G., Lombardo I., Loria D., Minniti T., Pagano A., Pagano E. V., Papa M., Pirrone S., Politi G., Porto F., Rizzo F., Rosato E., Russotto P., Santoro S., Trifiró A., Trimarchi M., Verde G., and Vigilante M.
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Physics ,QC1-999 - Abstract
The recent intensity upgrade of the LNS fragmentation beam is discussed. The available beams, the tagging procedures and details on the beam quality are reported. The experimental program started with the CHIMERA detector using such beams is also discussed with preliminary results and future perspectives.
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- 2012
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25. N/Z effects on 40,48Ca+40,48Ca reactions at 25 MeV/nucleon
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Cardella G., Buscemi M., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Acosta L., Lombardo I., Cavallaro S., Chatterjee M. B., DeFilippo E., Giuliani G., Geraci E., Grassi L., Han J., LaGuidara E., Lanzalone G., Loria D., Maiolino C., Minniti T., Pagano A., Papa M., Pirrone S., Politi G., Porto F., Rizzo F., Rosato E., Russotto P., Santoro S., Trifirò A., Trimarchi M., Verde G., and Vigilante M.
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Physics ,QC1-999 - Abstract
Effects related to the neutron to proton ratio (N/Z) degree of freedom in 40,48Ca+40,48Ca reactions at 25 MeV/nucleon have been investigated. Isotopic effect and even-odd staggering characterize the emission of light fragments at forward angles. The study of isobaric ratio 7Li/7Be for quasi-projectile source in semi-peripheral event of reactions allows moreover to investigate isospin diffusion effects in heavy ion collisions.
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- 2012
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26. N/Z effects on evaporation residue emission near fragmentation threshold
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Papa M., Pagano A., Minniti T., Maiolino C., Loria D., Lanzalone G., LaGuidara E., Han J., Grassi L., Geraci E., Giuliani G., DeFilippo E., Chatterjee M.B., Cavallaro S., Cardella G., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Lombardo I., Acosta L., Pirrone S., Politi G., Porto F., Rizzo F., Russotto P., Santoro S., Trifirò A., Trimarchi M., Verde G., and Vigilante M.
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Physics ,QC1-999 - Abstract
We will discuss results concerning the fate of hot nuclear systems populated in 40,48Ca+40,48Ca reactions at 25 MeV/nucleon. Due to the complexity of events, we used the Chimera 4π device as detection system. By selecting central events of reaction, we found that the interplay between binary-like and evaporation residue emissions is strongly sensitive on the N/Z of the entrance channels. In particular, evaporation residue emission increases at increasing the neutron content of colliding system. By comparing or data with CoMD-II model calculations, we can extract information about the density depend part of Symmetry Potential in the Nuclear Equation of State at near-saturation densities.
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- 2011
- Full Text
- View/download PDF
27. Dynamical Dipole mode in heavy-ion fusion reactions by using stable and radioactive beams
- Author
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Molini P., Mazzocchi C., Mazzocco M., Martin B., La Commara M., Maiolino C., Inglima G., Guglielmetti A., Farinon F., Emanuele U., Di Toro M., Del Zoppo A., De Rosa A., Coniglione R., De Filippo E., Colonna M., Boiano A., Baran V., Agodi C., Alba R., Silvestri R., Parascandolo C., Pierroutsakou D., Rizzo C., Romoli M., Sandoli M., Santonocito D., Signorini C., Soramel F., Trifirò A., and Trimarchi M.
- Subjects
Physics ,QC1-999 - Abstract
The existence of the dynamical dipole mode in the 192Pb composite system was investigated through the study of its prompt γ decay employing the 40Ca + 152Sm and 48Ca + 144Sm reactions at Elab =11 and 10.1 MeV/u, respectively. The γ-rays and light charged particles were detected in coincidence with evaporation residues and fission fragments. First results of this experiment show that the dynamical dipole mode survives in collisions involving heavier mass reaction partners than those studied previously. As a fast cooling mechanism on the fusion path, the prompt dipole γ radiation could be of interest for the synthesis of super-heavy elements through ”hot” fusion reactions. Furthermore, by using radioactive beams and the prompt γ radiation as a probe we could get information on the symmetry energy at sub-saturation densities.
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- 2011
- Full Text
- View/download PDF
28. First comparison of GEANT4 hadrontherapy physics model with experimental data for a NUMEN project reaction case.
- Author
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Oliveira, J. R. B., Moralles, M., Flechas, D., Carbone, D., Cavallaro, M., Torresi, D., Acosta, L., Agodi, C., Amador-Valenzuela, P., Bonanno, D., Borello-Lewin, T., Brischetto, G. A., Calabrese, S., Calvo, D., Capirossi, V., Cappuzzello, F., Chavez-Lomelí, E. R., Ciraldo, I., Delaunay, F., and Djapo, H.
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LIQUID scintillators ,ELECTRONIC equipment ,NUCLEAR reactions ,PHYSICS ,ELECTROMAGNETIC spectrum ,SCINTILLATORS ,GAMMA ray spectrometry - Abstract
Gamma-ray and neutron spectra from the 18 O + 76 Se reaction at 15.3 MeV/u were measured with the EDEN array of liquid scintillators at the LNS. The results were compared to GEANT Hadrontherapy physics list simulations in order to assess the reliability of this model for the development of the NUMEN project. A good agreement with the shape of the experimental gamma-ray spectra and a reasonable agreement with the total count rates were obtained. The gamma spectra originated from the nuclear reactions were selected by time coincidence with the Superconducting Cyclotron radio-frequency reference signal. The random coincidence background rate was appropriately described only when the Faraday Cup, the material and geometry of the experimental hall and its contents were included in the simulation with sufficient detail. The information on the radiation spectra is important for the adequate development of the project of the detector arrays and electronic equipment for the advanced phase of NUMEN. Since orders of magnitude larger beam intensities are planned for this phase, the random coincidence rate is also of significant importance, particularly for the performance of the G-NUMEN gamma calorimeter array. [ABSTRACT FROM AUTHOR]
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- 2020
- Full Text
- View/download PDF
29. Onset of quenching of the giant dipole resonance at high excitation energies
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Santonocito, D, Blumenfeld, Y, Agodi, C, Alba, R, Bellia, Giorgio Concetto, Coniglione, R, Delaunay, F, Del Zoppo, A, Finocchiaro, P, Hongmei, F, Lima, V, Maiolino, C, Migneco, E, Piattelli, P, Sapienza, P, Scarpaci, J, A, Wieland, O., Institut de Physique Nucléaire d'Orsay (IPNO), 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 ,Nuclear and High Energy Physics ,Quenching (fluorescence) ,010308 nuclear & particles physics ,Nuclear Theory ,Resonance ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Nuclear physics ,Dipole ,0103 physical sciences ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Excitation - Abstract
International audience; The evolution of the giant dipole resonance (GDR) properties in nuclei of mass A=120 to 132 has been investigated in an excitation energy range between 150 and 270 MeV through the study of complete and nearly complete fusion reactions using Sn116 beams at 17A and 23A MeV from the cyclotron of the Laboratorio Nazionale del Sud impinging on C12 and Mg24 targets. γ rays and light charged particles were detected using the multi-element detector array MEDEA in coincidence with evaporation residues detected by using mass and charge identification spectrometry with telescope (MACISTE). Light-charged-particle energy spectra were analyzed within the framework of a multiple-source-emission scenario by using a fitting procedure to determine the amount of pre-equilibrium emission and deduce the excitation energies reached in the compound nuclei. A detailed analysis of the γ-ray spectra and their comparison with statistical model calculations is presented. Evidence of a quenching of the GDR gamma yield was found at 270 MeV excitation energy. The quenching effect becomes progressively more important with increasing excitation energy, as observed when the comparison is extended to data from the reaction Ar36+Mo96 at 37A MeV where hot nuclei were populated up to 430 MeV excitation energy. A coherent scenario emerges indicating the existence of a limiting excitation energy for the collective motion of about E∗/A=2.1 MeV for systems of mass A=105 to 111 while a slightly lower value was observed for nuclei of mass A∼132. The existence of a possible link between GDR disappearance and the liquid-gas phase transition is discussed.
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- 2014
30. Probing of in-medium hadron structure with HADES
- Author
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Krücken, R., Salabura, P., Agakichiev, G., Agodi, C., Alvarez-Poll, H., Bałanda, A., Bellia, G., Bielčík, Jaroslav, Böhmer, M., Boyard, J., Braun-Munzinger, P., Chernenko, S., Christ, T., Coniglione, R., Djeridi, R., Dohrmann, F., Duran, I., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Friese, J., Fröhlich, I., Garzon, J., Gernhäuser, R., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Hennino, T., Hlavac, S., Holzmann, R., Ierusalimov, A., Iori, I., Jaskula, M., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B., Kotte, R., Kotulic-Bunta, J., Kugler, A., Kühn, W., Kulessa, R., Kurepin, A., Lang, S., Lehnert, J., Maiolino, C., Markert, J., Metag, V., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, J., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Pechenov, V., Perez, T., Pietraszko, J., Pleskac, R., Pospisil, V., Pvrzygoda, W., Rabin, N., Ramstein, B., Reshetin, A., Ritman, J., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Sanchez, M., Sapienza, P., Schmah, A., Smolyankin, V., Smykov, L., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tlusty, P., Toia, A., Traxler, M., Tsertos, Haralambos, Wagner, V., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Zanevsky, Y., Žovinec, D., Zumbruch, P., 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), HADES, and Tsertos, Haralambos [0000-0001-5966-343X]
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HEAVY-ION COLLISIONS ,RELATIVISTIC TRANSPORT APPROACH ,LOW-MASS DILEPTONS ,RHO-MESON MASS ,NUCLEAR-MATTER ,SPECTRAL-FUNCTION ,RING RECOGNITION ,AU COLLISIONS ,ENERGIES ,SPECTROMETER ,Nuclear and High Energy Physics ,Particle physics ,Nuclear Theory ,Hadron ,01 natural sciences ,Nuclear physics ,Pion ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Nuclear Experiment ,010306 general physics ,Physics ,Spectrometer ,010308 nuclear & particles physics ,Nuclear matter ,High Energy Physics::Experiment ,Heavy ion ,Spectral function - Abstract
The High Acceptance DiElectron Spectrometer (HADES) has been recently commissioned at GSI Darmstadt. It has been designed to study hadron properties inside nuclear matter via measurements of dielectron decays in proton, pion and heavy ion induced reactions in 1 - 2 AGeV energy range. We report first preliminary results on invariant masses of e+ e- pairs measured in 12C + 12C collisions at E = 2 AGeV and compare them to simulations based on UrQMD transport model. In summary we present and discuss planned experiments. © 2004 Elsevier B.V. All rights reserved. 749 1-4 SUPPL. 150c 159c Cited By :26
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- 2005
31. Effects of neutron richness on the behavior of nuclear systems at intermediate energies
- Author
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Cardella, G., Giuliani, G., Papa, M., Acosta, L., Agodi, C., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cavallaro, S., Chatterjee, M. B., De Filippo, E. , Geraci, E. , Grassi, L. , Han, La Guidara, E. , Loria, D. , Lanzalone, G. , Maiolino, C. , Minniti, T. , Pagano, A. , Pirrone, S. , Politi, G. , Porto, F. , Rizzo, F. , Russotto, P. , Santoro, S. , Trifirò, A. , Trimarchi, M. , Verde, LOMBARDO, IVANO, VIGILANTE, MARIANO, Cardella, G., Giuliani, G., Lombardo, I., Papa, M., Acosta, L., Agodi, C., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cavallaro, S., Chatterjee, M., De Filippo, E., Geraci, E., Grassi, L., Han, J., La Guidara, E., Loria, D., Lanzalone, G., Maiolino, C., Minniti, T., Pagano, A., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., Santoro, S., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Lombardo, Ivano, Chatterjee, M. B., De, Filippo, E., Geraci, E., Grassi, L., Han, La, Guidara, E., Loria, D., Lanzalone, G., Maiolino, C., Minniti, T., Pagano, A., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russotto, P., Santoro, S., Trifirò, A., Trimarchi, M., Verde, and Vigilante, Mariano
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Physics ,Nuclear and High Energy Physics ,Ion beam ,Multifragment emission and correlations ,Nuclear Theory ,Strongly damped collisions ,Symmetry (physics) ,Nuclear physics ,Molecular dynamics ,Physics::Accelerator Physics ,Neutron ,Production (computer science) ,Nuclear Experiment ,Nucleon - Abstract
We discuss results concerning the behavior of hot nuclear sources formed in 40 ,48Ca+40 ,48Ca reactions at 25 MeV/nucleon. A correlation between the neutron-to-proton ratio of the total systems and heavy residue production is found. This correlation underlines the strong role played by the neutron-to-proton ratio degree of freedom on the behavior of hot nuclei at intermediate energies. Comparisons of our data with Constrained Molecular Dynamics calculations confirm that a moderately stiff behavior of the symmetry potential must be used to reproduce experimental data. These findings open the way for future investigations with exotic beams at radioactive ion beam facilities. © 2012 American Physical Society.
- Published
- 2012
32. Hard gamma as probe of nuclear dynamics
- Author
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Coniglione, R, Sapienza, P, Alba, R, Agodi, C, Maiolino, C, Del Zoppo, A, Colonna, M, Bellia, G, Finocchiaro, P, Greco, V, Loukachine, K, Migneco, E, Piattelli, P, Santonocito, D, Colonna, N, Bruno, M, D'Agostino, M, Vannini, G, Mastinu, PF, Gramegna, F, Iori, I, Fabbietti, L, Moroni, A, Milazzo, PM, Blumenfeld, Y, Scarpaci, JA, MARGAGLIOTTI, GIACOMO, RUI, RINALDO, 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), Coniglione, R, Sapienza, P, Alba, R, Agodi, C, Maiolino, C, Del Zoppo, A, Colonna, M, Bellia, G, Finocchiaro, P, Greco, V, Loukachine, K, Migneco, E, Piattelli, P, Santonocito, D, Colonna, N, Bruno, M, D'Agostino, M, Vannini, G, Mastinu, Pf, Gramegna, F, Iori, I, Fabbietti, L, Moroni, A, Margagliotti, Giacomo, Milazzo, Pm, Rui, Rinaldo, Blumenfeld, Y, and Scarpaci, Ja
- Subjects
Physics ,Nuclear and High Energy Physics ,Photon ,Hadron ,energetic photons ,reaction dynamics ,Time evolution ,General Physics and Astronomy ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear physics ,Nuclear dynamics ,energetic photon ,Reaction dynamics ,Thermal ,Atomic physics ,Multiplicity (chemistry) ,Nuclear Experiment - Abstract
Experimental results concerning the Ni-58 + Ni-58 at 30 MeV/u and Ni-58 + Au-197 at 30 and 45 MeV/u reactions are presented. The emission mechanism of hard photons has been exploited to get information on the time evolution of the reactions. From the measured hard gamma multiplicity associated to different classes of heavy residues a quantitative estimate of the reaction centrality has been obtained. Moreover, evidence of a prompt Intermediate Mass Fragment (IMF) emission is shown for the Ni + Au reaction at 45 MeV/u for central collisions exploring the correlation function between thermal photons and IMF's.
- Published
- 2002
33. Charged particle's flux measurement from PMMA irradiated by 80 MeV/u carbon ion beam
- Author
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Agodi, C., Battistoni, G., Bellini, Fabio, Cirrone, G. A. P., Collamati, Francesco, Cuttone, G., Erika De Lucia, De Napoli, M., DI DOMENICO, Antonio, Antonio Di Domenico, Faccini, Riccardo, Ferroni, Fernando, Fiore, Salvatore, Gauzzi, Paolo, Iarocci, Enzo, Marafini, M., Mattei, I., Muraro, S., Paoloni, A., Patera, Vincenzo, Piersanti, Luca, Romano, F., Sarti, Alessio, Sciubba, Adalberto, Vitale, E., and Voena, Cecilia
- Subjects
Physics ,Range (particle radiation) ,Physics - Instrumentation and Detectors ,Radiological and Ultrasound Technology ,Degree (graph theory) ,Hadron ,Physics::Medical Physics ,FOS: Physical sciences ,Heavy Ion Radiotherapy ,Bragg peak ,Instrumentation and Detectors (physics.ins-det) ,Physics - Medical Physics ,Charged particle ,Nuclear physics ,Time of flight ,Polymethyl Methacrylate ,Radiology, Nuclear Medicine and imaging ,Medical Physics (physics.med-ph) ,Radiometry ,Energy (signal processing) ,Beam (structure) - Abstract
Hadrontherapy is an emerging technique in cancer therapy that uses beams of charged particles. To meet the improved capability of hadrontherapy in matching the dose release with the cancer position, new dose monitoring techniques need to be developed and introduced into clinical use. The measurement of the fluxes of the secondary particles produced by the hadron beam is of fundamental importance in the design of any dose monitoring device and is eagerly needed to tune Monte Carlo simulations. We report the measurements done with charged secondary particles produced from the interaction of a 80 MeV/u fully stripped carbon ion beam at the INFN Laboratori Nazionali del Sud, Catania, with a Poly-methyl methacrylate target. Charged secondary particles, produced at 90$\degree$ with respect to the beam axis, have been tracked with a drift chamber, while their energy and time of flight has been measured by means of a LYSO scintillator. Secondary protons have been identified exploiting the energy and time of flight information, and their emission region has been reconstructed backtracking from the drift chamber to the target. Moreover a position scan of the target indicates that the reconstructed emission region follows the movement of the expected Bragg peak position. Exploting the reconstruction of the emission region, an accuracy on the Bragg peak determination in the submillimeter range has been obtained. The measured differential production rate for protons produced with $E^{\rm Prod}_{\rm kin} >$ 83 MeV and emitted at 90$\degree$ with respect to the beam line is: $dN_{\rm P}/(dN_{\rm C}d\Omega)(E^{\rm Prod}_{\rm kin} > 83 {\rm ~MeV}, \theta=90\degree)= (2.69\pm 0.08_{\rm stat} \pm 0.12_{\rm sys})\times 10^{-4} sr^{-1}$., Comment: 13 pages, 9 figures
- Published
- 2012
34. Precise measurement of prompt photon emission from 80 MeV/u carbon ion beam irradiation
- Author
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Agodi, C., Bellini, F., Cirrone, G. A. P., Collamati, F., Cuttone, Giacomo, De Lucia, E., De Napoli, M., Di Domenico, A., Faccini, R., Ferroni, F., Fiore, S., Gauzzi, P., Iarocci, E., Marafini, M., Mattei, I., Paoloni, A., Patera, V., Piersanti, L., Romano, F., Sarti, A., Sciubba, A., Voena, C., and RI Di Domenico Antonio/G 6301 2011 Sarti Alessio/I 2833 2012 Bellini Fabio/D 1055 2009
- Subjects
dosimetry concepts and apparatus ,instrumentation for hadron therapy ,instrumentation for particle-beam therapy ,photoemission ,Physics ,Photon ,Proton ,Carbon ion beam ,Single photon emission ,Nuclear physics ,Photon emission ,Carbon ion therapy ,Irradiation ,Instrumentation ,Mathematical Physics ,Production rate - Abstract
Proton and carbon ion therapy is an emerging technique used for the treatment of solid cancers. The monitoring of the dose delivered during such treatments is still a matter of research. A possible technique exploits the information provided by single photon emission from nuclear decays induced by the irradiation. This paper reports the measurements of the spectrum and rate of such photons produced from the interaction of a 80 MeV=u fully stripped carbon ion beam at the Laboratori Nazionali del Sud of INFN, Catania, with a Poly-methyl methacrylate target. The differential production rate for photons with energy E > 2 MeV and emitted at 90 o is found to be dNg=(dNCdW) = (2:92 0:19) 10 2 sr 1 .
- Published
- 2012
35. Isospin transport effects in nuclear reactions at 25 MeV/nucleon
- Author
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Lombardo, I., Agodi, C., Alba, R., Amorini, F., Anzalone, A., Berceanu, I., Cardella, G., Cavallaro, S., Chatterjee, M. B., DE FILIPPO, E., DI PIETRO, A., Figuera, P., Geraci, Elena Irene, Giuliani, G., Grassi, L., Grzeszczuk, A., Han, J, Guidara, La, Lanzalone, E, G, Neindre, Le, Maiolino, N, Pagano, C, Papa, A, M, Pirrone, S., Politi, Giuseppe, Pop, A., Porto, F., Rizzo, Francesca, Russotto, P., Santonocito, D., Verde, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Isotopes of lithium ,Hadron ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Nuclear physics ,Baryon ,Isospin ,0103 physical sciences ,25.70.Lm, 25.70.Mn ,Atomic physics ,010306 general physics ,Nucleon ,Isotopes of beryllium ,Dimensionless quantity - Abstract
Isotopic effects are studied in reactions induced by {sup 40}Ca projectiles at 25 MeV/nucleon on {sup 40}Ca, {sup 48}Ca , and {sup 46}Ti targets. The N/Z contents of projectilelike and midvelocity (MV) sources are probed by means of isotopic ({sup 7}Li/{sup 6}Li and {sup 9}Be/{sup 7}Be) and isobaric ({sup 7}Li/{sup 7}Be) yield ratios, for semiperipheral events. In particular, information about isospin transport phenomena will be discussed. Isospin diffusion processes involving nuclei, which have noticeable differences in N/Z have been investigated. Signals of isospin drift, which are related to the gradient of density in the participant region, have also been observed for fragments emitted at MV.
- Published
- 2010
36. Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES
- Author
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Krücken, R., Agakishiev, G., Agodi, C., Bałanda, A., Bellia, G., Belver, D., Belyaev, A., Bielčík, Jaroslav, Blanco, A., Bortolotti, A., Boyard, J. L., Braun-Munzinger, P., Cabanelas, Pablo, Chernenko, S., Christ, T., Coniglione, R., Destefanis, M., Diáz, J., Dohrmann, F., Durán, I., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Ferreira-Marques, R., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krása, Antonín, Křížek, F., Kühn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Lopes, L., Lorenz, M., Maier, L., Maiolino, C., Mangiarotti, A., Marín, J., Markert, J., Metag, V., Michalska, B., Michel, J., Morinière, E., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Pérez Cavalcanti, T., Piattelli, P., Pietraszko, J., Pospíšil, V., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sapienza, P., Schmah, A., Schroeder, C., Schwab, E., Simon, R. S., Sobolev, Yu G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlustý, P., Traxler, M., Trebacz, R., Tsertos, Haralambos, Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., Zumbruch, P., Tsertos, Haralambos [0000-0001-5966-343X], 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 HADES
- Subjects
Nuclear and High Energy Physics ,Meson ,Hadron ,Nuclear Theory ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Particle and resonance production ,01 natural sciences ,Nuclear physics ,Pion ,25.75.Dw ,Relativistic heavy-ion collisions ,0103 physical sciences ,Rapidity ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Anisotropy ,Nuclear Experiment ,Physics ,Range (particle radiation) ,Spectrometer ,010308 nuclear & particles physics ,25.75.-q ,Collision ,High Energy Physics::Experiment - Abstract
We present the results of a study of charged pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of pi+- mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield. We have performed the first large-angular range measurement of the distribution of pi+- mesons for the 12C + 12C collision system covering a fairly large rapidity interval. The pion yields, transverse-mass and angular distributions are compared with calculations done within a transport model, as well as with existing data from other experiments. The anisotropy of pion production is systematically analyzed., 15 pages, 13 figures, v2 - the text unchanged, only full author list added to METADATA (in v1 only the first author and collaboration name), reference to published paper added
- Published
- 2009
37. The high-acceptance dielectron spectrometer HADES
- Author
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Hutsch, J., Krücken, R., Agakichiev, G., Agodi, C., Alvarez-Poll, H., Atkin, E., Badura, Eugen, Bałanda, A., Bassi, A., Bassini, R., Bellia, G., Belver, D., Belyaev, A. V., Benovic, M., Bertini, D., Bielčík, Jaroslav, Böhmer, M., Boiano, C., Bokemeyer, H., Bartolotti, A., Boyard, J. L., Brambilla, S., Braun-Munzinger, P., Cabanelas, Pablo, Castro, E., Chepurnov, V., Chernenko, S., Christ, T., Coniglione, R., Cosentino, L., Dahlinger, M., Daues, H. W., Destefanis, M., Diáz, J., Dohrmann, F., Dressler, R., Durán, I., Dybczak, A., Eberl, T., Enghardt, W., Fabbietti, L., Fateev, O. V., Fernández, C., Finocchiaro, P., Friese, J., Fröhlich, I., Fuentes, B., Galatyuk, T., Garabatos, Chilo, Garzón, J. A., Genolini, B., Gernhäuser, R., Gilardi, C., Gilg, H., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Hehner, J., Heidel, K., Heinz, T., Hennino, T., Hlavac, S., Hoffmann, J., Holzmann, R., Homolka, J., Ierusalimov, A. P., Iori, I., Ivashkin, A., Jaskula, M., Jourdain, J. C., Jurkovic, M., Kämpfer, B., Kajetanowicz, M., Kanaki, K., Karavicheva, T., Kastenmüller, A., Kidon, L., Kienle, P., Kirschner, D., Koenig, I., Koenig, W., Körner, H. J., Kolb, B. W., Kopf, U., Korcyl, K., Kotte, R., Kozuch, A., Krizek, F., Kühn, W., Kugler, A., Kulessa, R., Kurepin, A., Kurtukian-Nieto, T., Lang, S., Lange, J. S., Lapidus, K., Lehnert, J., Leinberger, U., Lichtblau, C., Lins, E., Lippmann, C., Lorenz, M., Magestro, D., Maier, L., Maier-Komor, P., Maiolino, C., Malarz, A., Marek, T., Markert, J., Metag, V., Michalska, B., Michel, J., Migneco, E., Mishra, D., Morinière, E., Mousa, J., Münch, M., Müntz, C., Naumann, L., Nekhaev, A., Niebur, W., Novotny, J., Novotny, R., Ott, W., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Cavalcanti, T. P., Petri, M., Piattelli, P., Pietraszko, J., Pleskac, R., Ploskon, M., Pospísil, V., Pouthas, J., Prokopowicz, W., Przygoda, W., Ramstein, B., Reshetin, A., Ritman, J., Roche, G., Rodriguez-Prieto, G., Rosenkranz, K., Rosier, P., Roy-Stephan, M., Rustamov, A., Sabin-Fernandez, J., Sadovsky, A., Sailer, B., Salabura, P., Salz, C., Sánchez, M., Sapienza, P., Schäfer, D., Schicker, R. M., Schmah, A., Schön, H., Schön, W., Schroeder, C., Schroeder, S., Schwab, E., Senger, P., Shileev, K., Simon, R. S., Skoda, M., Smolyankin, V., Smykov, L., Sobiella, M., Sobolev, Y. G., Spataro, S., Spruck, B., Stelzer, H., Ströbele, H., Stroth, J., Sturm, C., Sudoł, M., Suk, M., Szczybura, M., Taranenko, A., Tarantola, A., Teilab, K., Tiflov, V., Tikhonov, A., Tlusty, P., Toia, A., Traxler, M., Trebacz, R., Troyan, A. Y., Tsertos, Haralambos, Turzo, I., Ulrich, A., Vassiliev, D., Vázquez, A., Volkov, Y., Wagner, V., Wallner, C., Walus, W., Wang, Y., Weber, M., Wieser, J., Winkler, S., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y. V., Zeitelhack, K., Zentek, A., Zhou, P., Zovinec, D., Zumbruch, P., and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Nuclear and High Energy Physics ,Proton ,data acquisition ,Cherenkov detector ,electron hadron ,Hadron ,Nuclear Theory ,Mesons in nuclear matter ,Photon lepton and heavy quark production in relativistic heavy ion collisions ,Spectrometers and spectroscopic techniques ,Data acquisition and sorting ,FOS: Physical sciences ,Electron ,law.invention ,Nuclear physics ,Pion ,scattering [heavy ion] ,law ,ddc:530 ,tracking detector ,interaction [hadron nucleus] ,pair production [electron] ,Vector meson ,Nuclear Experiment (nucl-ex) ,performance [magnetic spectrometer] ,Nuclear Experiment ,25.75.Cj Photon, lepton, and heavy quark production in relativistic heavy ion collisions ,trigger [electron] ,RICH ,Darmstadt SIS ,leptonic decay [vector meson] ,Physics ,superconductivity [coil] ,Spectrometer ,track data analysis ,Detector ,time-of-flight [detector] ,29.30.-h Spectrometers and spectroscopic techniques ,drift chamber ,High Energy Physics::Experiment ,particle identification ,29.85.Ca Data acquisition and sorting ,21.65.Jk Mesons in nuclear matter ,mass spectrum [electron positron] ,hadronic [matter] - Abstract
HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion-induced collisions. Its main features include a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers and a multiplicity and electron trigger array for additional electron-hadron discrimination and event characterization. A two-stage trigger system enhances events containing electrons. The physics program is focused on the investigation of hadron properties in nuclei and in the hot and dense hadronic matter. The detector system is characterized by an 85% azimuthal coverage over a polar angle interval from 18° to 85°, a single electron efficiency of 50% and a vector meson mass resolution of 2.5%. Identification of pions, kaons and protons is achieved combining time-of-flight and energy loss measurements over a large momentum range (0.1 < p < 1.0 GeV/c). This paper describes the main features and the performance of the detector system. © Società Italiana di Fisica / Springer-Verlag 2009. 41 2 243 277
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- 2009
38. Measurement of low-mass e+e− pair production in 1 and 2 A GeV C–C collision with HADES
- Author
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Krücken, R., Sudol, M., Agakishiev, G., Agodi, C., Bałanda, A., Bellia, G., Belver, D., Belyaev, A., Bielčík, Jaroslav, Blanco, A., Bortolotti, A., Boyard, J. L., Braun-Munzinger, P., Cabanelas, Pablo, Chernenko, S., Christ, T., Coniglione, R., Destefanis, M., Diáz, J., Dohrmann, F., Durán, I., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Ferreira-Marques, R., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krása, Antonín, Křížek, F., Kühn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Lopes, L., Lorenz, M., Maier, L., Maiolino, C., Mangiarotti, A., Marín, J., Markert, J., Metag, V., Michalska, B., Michel, J., Morinière, E., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Pérez Cavalcanti, T., Piattelli, P., Pietraszko, J., Pospíšil, V., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sapienza, P., Schmah, A., Schroeder, C., Schwab, E., Simon, R., Sobolev, Y. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlustý, P., Traxler, M., Trebacz, R., Tsertos, Haralambos, Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., Zumbruch, P., 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), HADES, and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Physics ,Nuclear reaction ,Particle physics ,Physics and Astronomy (miscellaneous) ,Proton ,ENERGIES ,010308 nuclear & particles physics ,Hadron ,PI(0) ,HEAVY-ION COLLISIONS ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,7. Clean energy ,01 natural sciences ,Nuclear physics ,Pair production ,Pion ,Antimatter ,0103 physical sciences ,Mass spectrum ,High Energy Physics::Experiment ,010306 general physics ,Nuclear Experiment ,Engineering (miscellaneous) ,Lepton - Abstract
HADES is a secondary generation experiment operated at GSI Darmstadt with the main goal to study dielectron production in proton, pion and heavy ion induced reactions. The first part of the HADES mission is to reinvestigate the puzzling pair excess measured by the DLS collaboration in C+C and Ca+Ca collisions at 1A GeV. For this purpose dedicated measurements with the C+C system at 1 and 2A GeV were performed. The pair excess above a cocktail of free hadronic decays has been extracted and compared to the one measured by DLS. Furthermore, the excess is confronted with predictions of various model calculations. © 2009 Springer-Verlag / Società Italiana di Fisica. 62 1 81 84 Cited By :2
- Published
- 2008
39. Dielectron Production in $^{12} C+^{12}C$ Collisions at 1 GeV/u and the Solution to the DLS Puzzle
- Author
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Pachmayer, Y. C., Agakishiev, G., Agodi, C., Balanda, A., Bellia, G., Belver, D., Belayev, A., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., A. Garzon, J., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., W. Kolb, B., Kotte, R., Kozuch, A., Krasa, A., Krizek, F., Kücken, R., Kühn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., S. Lange, J., Lapidus, K., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pérez Cavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Simon, R., Sobolev, Yu.G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Veretenkin, I., Wagner, V., Wen, H., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., Zumbruch, P., Institut de Physique Nucléaire d'Orsay (IPNO), 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), HADES, and Robert, Suzanne
- Subjects
Physics ,Nuclear physics ,Nuclear and High Energy Physics ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Yield (chemistry) ,Hadron ,Production (computer science) ,High Energy Physics::Experiment ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,Energy (signal processing) - Abstract
6 pages, 3 figures, conference proceedings: Quark Matter 2008, Jaipur (India), 4-10 February 2008, submitted to J. Phys. G: Nuclear and Particle Physics; International audience; The production of e+e- pairs in $^{12}C+^{12}C$ collisions at 1 GeV/u was investigated with the HADES experiment at GSI, Darmstadt. In the invariant-mass region $ 0.15\: GeV/c^{2} \leq M_{ee} \leq 0.5\: GeV/c^{2}$ the measured pair yield shows a strong excess above the contribution expected from hadron decays after freeze-out. The data are in good agreement with the results of the former DLS experiment for the same system and energy.
- Published
- 2008
40. Dielectron spectroscopy at 1-2 AGeV with HADES
- Author
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Krücken, R., Spataro, S., Agakishiev, G., Agodi, C., Bałanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, Pablo, Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diáz, J., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krása, Antonín, Krizek, F., Kühn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Marín, J., Markert, J., Metag, V., Micel, J., Michalska, B., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Yiannis, Pechenov, V., Pechenova, O., Pérez Cavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Simon, R., Sobolev, Yu G., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, Haralambos, Veretenkin, I., Wagner, V., Wen, H., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., Zumbruch, P., and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Nuclear physics ,Physics ,Nuclear reaction ,25.75.-q Relativistic heavy-ion collisions – 13.40.Hq electromagnetic decays – 25.75.Dw Particle and resonance production ,Nuclear and High Energy Physics ,Antiparticle ,Particle physics ,Pair production ,Antimatter ,Hadron ,Nuclear fusion ,Multiplicity (mathematics) ,Lepton - Abstract
The HADES spectrometer at GSI (Darmstadt) is investigating the e + e - pair production in p+p, p+A and A+A collisions. In this contribution we would like to highlight the physics motivations and the experiments performed so far, focusing mainly on the first results coming from 12C + 12C collisions at 1 and 2AGeV, and on preliminary results from p+p/d+p collisions at 1.25AGeV.
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- 2008
41. Dilepton production in pp and CC collisions with HADES
- Author
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Krücken, R., Fröhlich, I., Agakishiev, G., Agodi, C., Bałanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, Pablo, Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diáz, J., Dohrmann, F., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P. J. R., Friese, J., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Grosse, E., Guber, F., Hadjivasiliou, Ch, Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krizek, F., Kugler, A., Kühn, W., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, S., Lopes, L., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Mishra, D., Moriniere, E., Mousa, J., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Pechenov, V., Pechenova, O., Cavalcanti, T. P., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Simon, R., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, Haralambos, Veretenkin, I., Wagner, V., Wen, H., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Zanevsky, Y., Zumbruch, P., 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), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Tsertos, Haralambos [0000-0001-5966-343X], 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
Heavy-ion collisions ,Nuclear and High Energy Physics ,ENERGIES ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Kinetic energy ,01 natural sciences ,7. Clean energy ,DECAYS ,Nuclear physics ,[PACS] Decays of other mesons ,0103 physical sciences ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Physics ,Spectrometer ,+400MeV%29%22">[PACS] Other reactions above meson production thresholds (energies > 400MeV) ,010308 nuclear & particles physics ,Form factor (quantum field theory) ,MESONS ,HEAVY-ION COLLISIONS ,[PACS] π, κ, and η mesons ,13.25.Jx - 13.40.Hq - 14.40.Aq - 25.40.Ve ,Production (computer science) ,High Energy Physics::Experiment ,Thermal model ,Beam energy ,[PACS] Electromagnetic decays - Abstract
5 pages, 4 figures.-- PACS nrs.: 13.25.Jx, 13.40.Hq, 14.40.Aq, 25.40.Ve.-- ISI Article Identifier: 000245667300102.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-ex/0610048, Contributed to: The IVth International Conference on Quarks and Nuclear Physics - QNP 2006 (Madrid, Spain, June 5-10, 2006)., e(+) e(-) production was studied using the High Acceptance DiElectron Spectrometer (HADES). In pp collisions at 2.2GeV kinetic beam energy, the exclusive η production and the Dalitz decay η -> γe(+)e(-) have been reconstructed. The electromagnetic form factor of the latter decay was found to be in good agreement with the existing theoretical predictions. In addition, an inclusive e(+)e(-) invariant-mass spectrum from the C-12 + C-12 reaction at 2AGeV is presented and compared with a simplified thermal model., The HADES collaboration gratefully acknowledges the support by BMBF grants 06TM970I, 06GI146I, 06F-140, and 06DR120 (Germany), by GSI (TM-FR1,GI/ME3,OF/STR), by grants GA CR 202/00/1668 and GA AS CR IAA1048304 (Czech Republic), by grant KBN 1P03B05629 (Poland), by INFN (Italy), by CNRS/IN2P3 (France), by grants MCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain), by grant UCY-10.3.11.12 (Cyprus), by INTAS grant 03-51-3208 and EU contract RII3-CT-2004-506078.
- Published
- 2007
42. Dielectron production in 12C+12C collisions at 2 AGeV with HADES
- Author
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Krücken, R., Markert, J., Agakishiev, G., Agodi, C., Bałanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, Pablo, Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diáz, J., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., Gonzlez-Díaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krizek, F., Kühn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lopes, L., Maier, L., Mangiarotti, A., Marín, J., Metag, V., Michalska, B., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Pechenov, V., Pechenova, O., Cavalcanti, T. P., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Simon, R., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, Haralambos, Veretenkin, I., Wagner, V., Wen, H., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., Zumbruch, P., 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), HADES, and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Nuclear and High Energy Physics ,Particle physics ,ENERGIES ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,HEAVY-ION COLLISIONS ,PI(0) ,01 natural sciences ,7. Clean energy ,Nuclear physics ,Pion ,0103 physical sciences ,Incident energy ,010306 general physics ,Nuclear Experiment ,Physics ,Electron pair ,Spectrometer ,010308 nuclear & particles physics ,Detector ,π(0) ,Energies ,Heavy-ion Collisions ,Pair production ,High Energy Physics::Experiment ,Nucleon ,Beam energy - Abstract
5 pages, 2 figures.-- ISI Article Identifier: 000248251400153, Printed version published on Aug 2007., We report on a measurement of electron pair production in C-12(+) C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. The measured pair production probabilities span over five orders of magnitude from the π(0)-Dalitz to the ρ/w invariant-mass region. Dalitz decays of π(0) and η account for all the yield up to 0.15 GeV/c^2, but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12(+) C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario., The collaboration gratefully acknowledges the support by BMBF grants 06TM970I, 06GI146I, 06F-140 and 06DR120 (Germany), by GSI (TM-FR1,GI/ME3,OF/STR), by grants GA CR 202/00/1668 and GA AS CR IAA1048304 (Czech Republic), by grant KBN 1P03B 056 29 (Poland), by INFN (Italy), by CNRS/IN2P3 (France), by grants MCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain), by grant UCY-10.3.11.12 (Cyprus), by INTAS grant 03-51-3208 and by EU contract RII3-CT-2004-506078.
- Published
- 2007
43. Measurement of the di-electron mass spectrum in 12C+12C collisions at 2 AGeV by HADES
- Author
-
Holzmann, R., Agakichiev, G., Agodi, C., Alvarez Pol, H., Badura, E., Balanda, A., Bassini, R., Bellia, G., Berdermann, E., Bertini, D., Bielcik, J., Boehmer, M., Boiano, C., Bokemeyer, H., Boyard, J., Brambilla, S., Braun Munzinger, P., Chernenko, S., Christ, T., Coniglione, R., Czok, U., Dahlinger, M., Daues, H. W., Dohrmann, F., Duran, I., Eberl, T., Emeljanov, V., Fabbietti, L., Fateev, O., Finocchiaro, P., Firsov, A., Friese, J., Froehlich, I., Garzon, J. A., Gernhuser, R., Gilardi, C., Golubeva, M., Gonzales, D., Grosse, E., Guber, F., Gringer, H., Hehner, J., Hennino, T., Hlavac, S., Hoffmann, J., Ierusalimov, A., Iori, I., Jaskula, M., Jurkovic, M., Kajetanowicz, M., Kmpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, W., Koenig, I., Kolb, B. W., Kotte, R., Krcken, R., Kugler, A., Khn, W., Kulessa, R., Kurepin, A., Lang, S., Lange, J. S., Lehnert, J., Maier, L., Maier Komor, P., Maiolino, C., Markert, J., Metag, V., Morini`ere, E., Mousa, J., Mnch, M., Mntz, C., Naumann, L., Novotny, R., Ott, W., Otwinowski, J., Pachmayer, Y. C., Panebratsev, Y., Pant, L., Pechenov, V., Perez, T., Piattelli, P., Pietraszko, J., Pleskac, R., Przygoda, W., Pullia, A., Ramstein, B., Reshetin, A., Ritman, J., Rosier, P., Roy, A., Roy Stephan, M., Rustamov, A., Sabin Fernandez, J., Sadovski, A., Sailer, B., Salabura, P., Sanchez, M., Sapienza, P., Schmah, A., Schroeder, C., Schfer, D., Shileev, K., Simon, R. S., Skoda, M., Smykov, L., Spataro, STEFANO GIOVANNI, Spruck, B., Stelzer, H., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tiflov, V., Tlusty, P., Toia, A., Traxler, M., Tsertos, H., Turzo, I., Tyminska, K., Varma, R., Wagner, V., Walus, W., Winkler, S., Wisniowski, M., Wojcik, T., Wstenfeld, J., Zanevsky, Y., Zovinec, D., and Zumbruch, P.
- Subjects
Physics ,AU COLLISIONS ,Nuclear and High Energy Physics ,Particle physics ,Rho meson ,Spectrometer ,PAIR PRODUCTION ,ENERGIES ,HEAVY-ION COLLISIONS ,DILEPTON PRODUCTION ,RHO-MESON ,450 GEV/C ,P-BE ,MATTER ,PHI ,Hadron ,Spectrum (functional analysis) ,Electron ,Nuclear physics ,Pair production - Abstract
The physics program of the High Acceptance Di-Electron Spectrometer HADES at GSI is largely motivated by the aim to study medium modifications of hadrons predicted by many theoretical approaches, as well as by the need to shed light on the still unexplained results of the former DLS experiment. In this contribution the HADES experiment is outlined and first results obtained in 12 C+ 12 C collisions at 2 AGeV are presented.
- Published
- 2006
44. Dilepton analysis in the hades spectrometer for 12C+ 12C at 2 agev
- Author
-
Krücken, R., Otwinowski, J., Agakichiev, G., Agodi, C., Alvarez-Poll, H., Bałanda, A., Bellia, G., Bielčík, Jaroslav, Bömer, M., Bokemeyer, H., Boyard, J., Braun-Munzinger, P., Chernenko, S., Christ, T., Coniglione, R., Djeridi, R., Dohrmann, F., Durán, I., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Friese, J., Fröhlich, I., Garzón, J., Gernhäuser, R., Golubeva, M., Gonzalez, D., Grosse, E., Gruber, F., Hennino, T., Hlavac, S., Holzmann, R., Ierusalimov, A., Iori, I., Jaskuła, M., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B., Kopf, U., Kotte, R., Kotulic-Bunta, J., Kugler, A., Kühn, W., Kulessa, R., Kurepin, A., Lang, S., Lehnert, J., Maiolino, C., Market, J., Metag, V., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, J., Novotný, J., Pachmayer, Y. C., Pant, L. M., Pechenov, V., Pérez, T., Pietraszko, J., Pleskač, R., Pospíšil, V., Przygoda, W., Rabin, N., Ramstein, B., Reshetin, A., Ritman, J., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sánchez, M., Sapienza, P., Schmah, A., Simon, R., Smolyanikin, V., Smykov, L., Spataro, S., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tlustý, P., Toia, A., Traxler, M., Tsertos, Haralambos, Wagner, V., Wiśniowski, M., Wójcik, T., Wüstenfeld, J., Zanevsky, Y., Žoviniec, D., Zumbruch, P., and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Nuclear and High Energy Physics ,Particle physics ,Meson ,radioisotope decay ,lepton ,Nuclear Theory ,meson ,Spectrometer ,Nuclear physics ,invariant mass ,nuclear physics ,TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY ,Invariant mass ,Nuclear Experiment ,Physics ,Signal reconstruction ,Background reconstruction ,article ,Astronomy and Astrophysics ,dilepton spectroscopy ,spectrometer ,Atomic and Molecular Physics, and Optics ,molecular interaction ,High Energy Physics::Experiment ,hadron ,combinatorial chemistry ,Dileptons - Abstract
The identification of the light mesons in the HADES spectrometer is based on an invariant mass reconstruction of their decay into e+e- pairs. In the dilepton (e+e-) signal reconstruction, particularly important is the reduction of a huge combinatorial background arising from wrong combinations of e+ and e- to unlike sign pairs. Methods of the dilepton signal and combinatorial background reconstruction in the HADES spectrometer will be presented.
- Published
- 2005
45. Dilepton analysis in the HADES spectrometer for C+C at 2 A GeV
- Author
-
Krücken, R., Bielčík, Jaroslav, Agakishiev, G., Agodi, C., Alvarez-Poll, H., Bałanda, A., Bellia, G., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Chernenko, S., Christ, T., Coniglione, R., Djeridi, R., Dohrmann, F., Durán, I., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Friese, J., Fröhlich, I., Garzón, J. A., Gernhäuser, R., Golubeva, M., González-Daz, D., Grosse, E., Guber, F., Hennino, T., Hlavac, S., Holzmann, R., Ierusalimov, A., Iori, I., Jaskula, M., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kottel, R., Kotulic-Bunta, J., Kugler, A., Kühn, W., Kulessa, R., Kurepin, A., Lang, S., Lehnert, J., Maiolino, C., Markert, J., Metag, V., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, R., Novotny, J., Otwinowski, J., Pachmayer, Y. C., Pant, L. M., Pechenov, V., Pérez, T., Pietraszko, J., Pleskac, R., Pospísil, V., Przygoda, W., Rabin, N., Ramstein, B., Reshetin, A., Ritman, J., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sánchez, M., Sapienza, P., Schmah, A., Simon, R., Smolyankin, V., Smykov, L., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tlusty, P., Toia, A., Traxler, M., Tsertos, Haralambos, Wagner, V., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Zanevsky, Y., Zovinec, D., Zumbruch, P., Tsertos, Haralambos [0000-0001-5966-343X], 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 HADES
- Subjects
Nuclear and High Energy Physics ,Particle physics ,Meson ,Physics::Instrumentation and Detectors ,Nuclear Theory ,01 natural sciences ,7. Clean energy ,Spectral line ,Nuclear physics ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,010306 general physics ,Nuclear Experiment ,Positron annihilation ,Physics ,RING RECOGNITION ,Spectrometer ,010308 nuclear & particles physics ,Signal reconstruction ,Detector ,High Energy Physics::Phenomenology ,HADRON PROPERTIES ,MATTER ,High Energy Physics::Experiment ,Lepton - Abstract
The high-acceptance dielectron spectrometer (HADES) has become operational at GSI Darmstadt. The primary physics programme is to study in-medium changes of light vector mesons via their e+e- decays. The methods of dilepton signal reconstruction in the HADES spectrometer and preliminary dilepton spectra for C+C reactions at 2 A GeV are presented. In the signal reconstruction, particularly important is the reduction of the huge combinatorial background arising from e+e- combinations of leptons from gamma conversion in materials with other leptons in the collision. The purity of the dilepton signal is determined by using GEANT simulations with the full HADES geometry and a realistic detector response. © 2005 IOP Publishing Ltd. 31 4 S231 S237
- Published
- 2005
46. Study of e+, e- production in elementary and nuclear collisions near the production threshold with HADES
- Author
-
Krücken, R., Salabura, P., Agodi, C., Alvarez-Poll, H., Bałanda, A., Bellia, G., Belver, D., Bielčík, Jaroslav, Böhmer, M., Bokemeyer, H., Boyard, J., Braun-Munzinger, P., Chepurnov, V., Chernenko, S., Christ, T., Coniglione, R., Diáz, J., Djeridi, R., Dohrmann, F., Duran, I., Eberl, T., Emeljanov, V., Fabbietti, L., Fateev, O., Fernandez, C., Finocchiaro, P., Friese, J., Fröhlich, I., Fuentes, B., Garzon, J., Gernhäuser, R., Golubeva, M., Gonzalez, D., Grosse, E., Guber, F., Hennino, T., Hlavac, S., Hoffmann, J., Holzmann, R., Ierusalimov, A., Iori, I., Jaskula, M., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B., Kotte, R., Kotulic-Bunta, J., Kugler, A., Kuhn, W., Kulessa, R., Kurepin, A., Kurtukian-Nieto, T., Lang, S., Lehnert, J., Maiolino, C., Marn, J., Markert, J., Metag, V., Montes, N., Mousa, J., Münch, M., Müntz, C., Naumann, L., Novotny, J., Otwinowski, J., Pachmayer, Y. C., Panebratsev, Y., Pechenov, V., Perez, T., Pietraszko, J., Pleskac, R., Pospisil, V., Przygoda, W., Rabin, N., Ramstein, B., Reshetin, A., Ritman, J., Rodriguez-Prieto, G., Roy-Stephan, M., Rustamov, A., Sabin-Fernandez, J., Sadovsky, A., Sailer, B., Sanchez, M., Smolyankin, V., Smykov, L., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Titov, A., Tlusty, P., Toia, A., Traxler, M., Tsertos, Haralambos, Vazquez, A., Volkov, Y., Wagner, V., Walus, W., Winkler, S., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Zanevsky, Y., Zumbruch, P., and Tsertos, Haralambos [0000-0001-5966-343X]
- Subjects
Nuclear and High Energy Physics ,Particle physics ,Spectral representation ,Meson production ,Proton ,Meson ,ENERGIES ,High resolution electron microscopy ,Dielectron production ,Spectrum analyzers ,HEAVY-ION COLLISIONS ,Spectroscopic analysis ,Resonance ,DECAYS ,Heavy ions ,Nuclear physics ,Pion ,Electromagnetism ,Baryonic resonances ,SPECTROMETER ,DILEPTON PRODUCTION ,RING RECOGNITION ,VECTOR-MESONS ,Meson reconstruction ,Nuclear Experiment ,Physics ,Mathematical models ,Elementary particles ,Vector meson dominance ,Vectors ,Vector dominance models (VDM) ,High Energy Physics::Experiment ,Heavy ion - Abstract
HADES is a second generation experiment designed to study dielectron production in proton, pion, and heavy ion induced reactions at the GSI accelerator facility in Darmstadt. The physics programme of HADES is focused on in-medium properties of the light vector mesons. In this contribution we present status of the HADES experiment, demonstrate its capability to identify rare dielectron signal, show first experimental results obtained from C+C reactions at 2 A GeV and shortly discuss physics programme of up-coming experimental runs. © 2004 Elsevier B.V. All rights reserved. 53 1 49 58 Cited By :12
- Published
- 2004
47. Energetic proton emission in heavy ion collisions at intermediate energy: Pre-equilibrium and cooperative effects
- Author
-
Sapienza, P., Coniglione, R., Colonna, M., Migneco, E., Agodi, C., Alba, R., Bellia, G., Del Zoppo, A., Finocchiaro, P., Greco, V., Loukachine, K., Maiolino, C., Piattelli, P., Santonocito, D., Ventura, P.G., Blumenfeld, Y., Bruno, M., Colonna, N., D'Agostino, M., Fabbietti, L., Fiandri, M.L., Gramegna, F., Iori, I., Margagliotti, G.V., Mastinu, P.F., Milazzo, P.M., Moroni, A., Rui, R., Scarpaci, J-A., Vannini, G., 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), P., Sapienza, R., Coniglione, M., Colonna, E., Migneco, C., Agodi, R., Alba, G., Bellia, A., Del Zoppo, P., Finocchiaro, V., Greco, K., Loucakine, C., Maiolino, P., Piattelli, D., Santonocito, P. G., Ventura, Y., Blumenfeld, M., Bruno, N., Colonna, M., D'Agostino, L., Fabbietti, M. L., Fiandri, F., Gramegna, I., Iori, Margagliotti, Giacomo, P. F., Mastinu, P. M., Milazzo, A., Moroni, Rui, Rinaldo, J. A., Scarpaci, G., Vannini, and Robert, Suzanne
- Subjects
Physics ,Nuclear and High Energy Physics ,Proton ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Theory ,Hadron ,General Physics and Astronomy ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,pre-equilibrium ,Nuclear physics ,Intermediate energy ,subthreshold emission ,Available energy ,Heavy ion ,Multiplicity (chemistry) ,Proton emission ,Atomic physics ,Nuclear Experiment ,Nucleon - Abstract
Energetic proton emission has been investigated as a function of the centrality in the reaction Ni-58 + Ni-58 at 30 AMeV. Protons with energy extending up to a relevant fraction of the total available energy in the reaction were measured and studied. The dependence on the reaction centrality has been extensively investigated and data have been compared with the results of microscopic transport calculations. The more striking observation concerns the extremely energetic proton (E-P(NN) greater than or equal to 130 MeV) multiplicity which is found to increase almost quadratically with the number of participant nucleons thus indicating the onset of a mechanism beyond one and two-body dynamics.
- Published
- 2002
48. 8Li(α,n)11B at Big Bang Temperatures: Neutron Counting With a Low Intensity 8Li Radioactive Beam.
- Author
-
Cherubini, S., Figuera, P., Musumarra, A., Agodi, C., Alba, R., Calabretta, L., Cosentino, L., Del Zoppo, A., Di Pietro, A., Lamia, L., Pappalardo, L., Pellegriti, M. G., Pizzone, R. G., Rinollo, A., Rolfs, C., Romano, S., Spitaleri, C., Strieder, F., Tudisco, S., and Tumino, A.
- Subjects
PHYSICS ,TEMPERATURE ,RADIOACTIVE nuclear beams ,NUCLEAR physics - Abstract
The cross section of 8Li(α,n)11B is very important for the study of primordial nucleosinthesys models. In this paper we report on the production of a 8Li beam via the 7Li(d,p)8Li reaction at the Laboratori Nazionali del Sud. Also, a novel experimental technique for measuring the reaction 8Li(α,n)11B at energies of astrophysical interest has been implemented and tested. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
49. STUDY OF ELEMENTARY REACTIONS WITH THE HADES DIELECTRON SPECTROMETER.
- Author
-
RAMSTEIN, B., AGAKICHIEV, G., AGODI, C., BALANDA, A., BELLIA, G., BELVER, D., BELYAEV, A., BLANCO, A., BÖHMER, M., BOYARD, J. L., BRAUN-MUNZINGER, P., CABANELAS, P., CASTRO, E., CHRIST, T., DESTEFANIS, M., DÍAZ, J., DOHRMANN, F., DYBCZAK, A., FABBIETTI, L., and FATEEV, O.
- Subjects
SPECTROMETERS ,SPECTRUM analysis instruments ,DILEPTON production ,LEPTONS (Nuclear physics) ,PHYSICS - Abstract
Results obtained with the HADES dielectron spectrometer at GSI are discussed, with emphasis on dilepton production in elementary reactions. [ABSTRACT FROM AUTHOR]
- Published
- 2010
50. Dipole γ-ray emission in fusion heavy-ion reactions: beam energy dependence.
- Author
-
Martin, B., Pierroutsakou, D., Inglima, G., Boiano, A., De Rosa, A., Di Pietro, M., La Commara, M., Romoli, M., Sandoli, M., Agodi, C., Alba, R., Cardella, G., Colonna, M., Coniglione, R., De Filippo, E., Del Zoppo, A., Di Toro, M., Maiolino, C., Pagano, A., and Pellegriti, N.
- Subjects
ION bombardment ,COLLISIONS (Nuclear physics) ,IONS ,NUCLEAR fusion ,PHYSICS ,NUCLEAR reactions ,NUCLEAR physics - Abstract
We investigated the prompt dipole γ-ray emission, related with entrance channel charge asymmetry effects, in the 40Ar + 92Zr and 36Ar + 96Zr fusion reactions at Elab= 15 and 16 MeV/nucleon, respectively, with the aim to probe its evolution with incident energy. These reactions populate, through entrance channels having different charge asymmetries, the 132Ce compound nucleus at an average excitation energy of 304 MeV with identical spin distribution. Fusionlike events were selected by detecting high-energy γ-rays in coincidence with evaporation residues. By studying the differential γ-ray multiplicity spectra of the considered reactions, it was shown that the dipole γ-ray intensity increases by ∼14% for the more charge asymmetric system. This result, associated with those reported for the 32,36S + 100,96Mo reaction pair at lower beam energies, implies a “rise and fall” trend of the prompt dipole γ-ray emission in the studied beam energy range with a maximum value at 9 MeV/nucleon. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
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