C. Bottosso - Academia.edu (original) (raw)
Papers by C. Bottosso
The characteristic properties of the hot nuclear matter existing at the time of fragment formatio... more The characteristic properties of the hot nuclear matter existing at the time of fragment formation in the multifragmentation events produced in the reaction ^64Zn + ^112Sn at 40 MeV/nucleon are studied. A kinematical focusing method is employed to determine the multiplicities of evaporated light particles, associated with isotopically identified detected fragments. From these data the primary isotopic yield distributions are reconstructed using a Monte Carlo method. The reconstructed yield distributions are in good agreement with the primary isotope distributions obtained from AMD transport model simulations. Utilizing the reconstructed yields, power distribution, Landau free energy, characteristic properties of the emitting source are examined. The primary mass distributions exhibit a power law distribution with the critical exponent, A^-2.3, for A ≥ 15 isotopes, but significantly deviates from that for the lighter isotopes. Landau free energy plots show no strong signature of the ...
Measurements of the density dependence of the free symmetry energy in low density clustered matte... more Measurements of the density dependence of the free symmetry energy in low density clustered matter have been extended using the NIMROD multi-detector at Texas A&M University. Thermal coalescence models were employed to extract densities, ρ, and temperatures, T, for evolving systems formed in collisions of 47 A MeV ^40Ar + ^112Sn,^124Sn and ^64Zn + ^112Sn, ^124Sn. Densities of 0.03 ≤ρ/ρ_0 ≤ 0.2 and temperatures in the range 5 to 10 MeV have been sampled. The free symmetry energy coefficients are found to be in good agreement with values calculated using a quantum statistical model. Values of the corresponding symmetry energy coefficient are derived from the data using entropies derived from the model.
For the first time primary hot isotope distributions are experimentally reconstructed in intermed... more For the first time primary hot isotope distributions are experimentally reconstructed in intermediate heavy ion collisions and used with antisymmetrized molecular dynamics (AMD) calculations to determine density, temperature and symmetry energy coefficient in a self-consistent manner. A kinematical focusing method is employed to reconstruct the primary hot fragment yield distributions for multifragmentation events observed in the reaction system ^64Zn + ^112Sn at 40 MeV/nucleon. The reconstructed yield distributions are in good agreement with the primary isotope distributions of AMD simulations. The experimentally extracted values of the symmetry energy coefficient relative to the temperature, a_sym/T, are compared with those of the AMD simulations with different density dependence of the symmetry energy term. The calculated a_sym/T values changes according to the different interactions. By comparison of the experimental values of a_sym/T with those of calculations, the density of t...
The relative isobaric yields of fragments produced in a series of heavy ion induced multifragment... more The relative isobaric yields of fragments produced in a series of heavy ion induced multifragmentation reactions have been analyzed in the framework of a Modified Fisher Model, primarily to determine the ratio of the symmetry energy coefficient to the temperature, a_a/T, as a function of fragment mass A. The extracted values increase from 5 to 16 as A increases from 9 to 37. These values have been compared to the results of calculations using the Antisymmetrized Molecular Dynamics (AMD) model together with the statistical decay code Gemini. The calculated ratios are in good agreement with those extracted from the experiment. In contrast, the ratios determined from fitting the primary fragment distributions from the AMD model calculation are 4 and show little variation with A. This observation indicates that the value of the symmetry energy coefficient derived from final fragment observables may be significantly different than the actual value at the time of fragment formation. The e...
L. Qin, J. B. Natowitz, G. Roepke, K. Hagel, R. Wada, Z. Chen, P. Sahu, S. Kowalski, C. Bottosso ... more L. Qin, J. B. Natowitz, G. Roepke, K. Hagel, R. Wada, Z. Chen, P. Sahu, S. Kowalski, C. Bottosso , S. Shlomo, M. Barbui, D. Fabris, M. Lunardon, S. Moretto, G. Nebbia, S. Pesente, V. Rizzi, G. Viesti, M. Cinausero, G. Prete, T. Keutgen, Y. El Masri, and Z. Majka University of Rostock, FB Physik, Rostock, Germany Institute of Physics, Silesia University, Katowice, Poland Dipartamento di Fisica dell’Universita di Padova and INFN Sezione di Padova, Italy INFN Laboratori Nazionali di Legnaro, Italy Universit ́e Catholique de Louvain, Louvain-la-Neuve, Belgium, Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
![Research paper thumbnail of Erratum: Novel determination of density, temperature, and symmetry energy for nuclear multifragmentation through primary fragment-yield reconstruction [Phys. Rev. C 89 , 021601(R) (2014)]](https://attachments.academia-assets.com/82385547/thumbnails/1.jpg)
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EPJ Web of Conferences, 2015
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
The formation of clusters in low density matter formed in near Fermi energy heavy ion collisions ... more The formation of clusters in low density matter formed in near Fermi energy heavy ion collisions has been investigated using the NIMROD multi-detector at Texas A&M University. Emphasis is on elucidation of the low density equation of state. Temperature and density dependent symmetry free energies derived from isoscaling analyses of the yields of nuclei with A<=4 are far above those
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008
Recent heavy ion reaction studies aimed at elucidating the properties of low density matter produ... more Recent heavy ion reaction studies aimed at elucidating the properties of low density matter produced in near Fermi-energies are discussed. At the lowest densities and temperatures large alpha mass fractions are observed. The symmetry free energies derived from isoscaling analyses are far above those obtained in common effective interaction calculations, reflecting cluster formation, primarily of alpha particles, not included in such calculations. Theoretical modeling of these results requires the consideration of cluster formation and medium modifications of cluster properties.
Current research on clustering in low density matter formed in near Fermi energy heavy ion collis... more Current research on clustering in low density matter formed in near Fermi energy heavy ion collisions is discussed Temperature and density dependent symmetry free energies derived from isoscaling analyses of the yields of nuclei with A ≤ 4 are far above those obtained in common effective interaction calculations, reflecting cluster formation, primarily of alpha particles, not included in such calculations.
Physical Review Letters, 2012
The characteristic properties of the hot nuclear matter existing at the time of fragment formatio... more The characteristic properties of the hot nuclear matter existing at the time of fragment formation in the multifragmentation events produced in the reaction ^64Zn + ^112Sn at 40 MeV/nucleon are studied. A kinematical focusing method is employed to determine the multiplicities of evaporated light particles, associated with isotopically identified detected fragments. From these data the primary isotopic yield distributions are reconstructed using a Monte Carlo method. The reconstructed yield distributions are in good agreement with the primary isotope distributions obtained from AMD transport model simulations. Utilizing the reconstructed yields, power distribution, Landau free energy, characteristic properties of the emitting source are examined. The primary mass distributions exhibit a power law distribution with the critical exponent, A^-2.3, for A ≥ 15 isotopes, but significantly deviates from that for the lighter isotopes. Landau free energy plots show no strong signature of the ...
Measurements of the density dependence of the free symmetry energy in low density clustered matte... more Measurements of the density dependence of the free symmetry energy in low density clustered matter have been extended using the NIMROD multi-detector at Texas A&M University. Thermal coalescence models were employed to extract densities, ρ, and temperatures, T, for evolving systems formed in collisions of 47 A MeV ^40Ar + ^112Sn,^124Sn and ^64Zn + ^112Sn, ^124Sn. Densities of 0.03 ≤ρ/ρ_0 ≤ 0.2 and temperatures in the range 5 to 10 MeV have been sampled. The free symmetry energy coefficients are found to be in good agreement with values calculated using a quantum statistical model. Values of the corresponding symmetry energy coefficient are derived from the data using entropies derived from the model.
For the first time primary hot isotope distributions are experimentally reconstructed in intermed... more For the first time primary hot isotope distributions are experimentally reconstructed in intermediate heavy ion collisions and used with antisymmetrized molecular dynamics (AMD) calculations to determine density, temperature and symmetry energy coefficient in a self-consistent manner. A kinematical focusing method is employed to reconstruct the primary hot fragment yield distributions for multifragmentation events observed in the reaction system ^64Zn + ^112Sn at 40 MeV/nucleon. The reconstructed yield distributions are in good agreement with the primary isotope distributions of AMD simulations. The experimentally extracted values of the symmetry energy coefficient relative to the temperature, a_sym/T, are compared with those of the AMD simulations with different density dependence of the symmetry energy term. The calculated a_sym/T values changes according to the different interactions. By comparison of the experimental values of a_sym/T with those of calculations, the density of t...
The relative isobaric yields of fragments produced in a series of heavy ion induced multifragment... more The relative isobaric yields of fragments produced in a series of heavy ion induced multifragmentation reactions have been analyzed in the framework of a Modified Fisher Model, primarily to determine the ratio of the symmetry energy coefficient to the temperature, a_a/T, as a function of fragment mass A. The extracted values increase from 5 to 16 as A increases from 9 to 37. These values have been compared to the results of calculations using the Antisymmetrized Molecular Dynamics (AMD) model together with the statistical decay code Gemini. The calculated ratios are in good agreement with those extracted from the experiment. In contrast, the ratios determined from fitting the primary fragment distributions from the AMD model calculation are 4 and show little variation with A. This observation indicates that the value of the symmetry energy coefficient derived from final fragment observables may be significantly different than the actual value at the time of fragment formation. The e...
L. Qin, J. B. Natowitz, G. Roepke, K. Hagel, R. Wada, Z. Chen, P. Sahu, S. Kowalski, C. Bottosso ... more L. Qin, J. B. Natowitz, G. Roepke, K. Hagel, R. Wada, Z. Chen, P. Sahu, S. Kowalski, C. Bottosso , S. Shlomo, M. Barbui, D. Fabris, M. Lunardon, S. Moretto, G. Nebbia, S. Pesente, V. Rizzi, G. Viesti, M. Cinausero, G. Prete, T. Keutgen, Y. El Masri, and Z. Majka University of Rostock, FB Physik, Rostock, Germany Institute of Physics, Silesia University, Katowice, Poland Dipartamento di Fisica dell’Universita di Padova and INFN Sezione di Padova, Italy INFN Laboratori Nazionali di Legnaro, Italy Universit ́e Catholique de Louvain, Louvain-la-Neuve, Belgium, Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
EPJ Web of Conferences, 2015
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
The formation of clusters in low density matter formed in near Fermi energy heavy ion collisions ... more The formation of clusters in low density matter formed in near Fermi energy heavy ion collisions has been investigated using the NIMROD multi-detector at Texas A&M University. Emphasis is on elucidation of the low density equation of state. Temperature and density dependent symmetry free energies derived from isoscaling analyses of the yields of nuclei with A<=4 are far above those
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008
Recent heavy ion reaction studies aimed at elucidating the properties of low density matter produ... more Recent heavy ion reaction studies aimed at elucidating the properties of low density matter produced in near Fermi-energies are discussed. At the lowest densities and temperatures large alpha mass fractions are observed. The symmetry free energies derived from isoscaling analyses are far above those obtained in common effective interaction calculations, reflecting cluster formation, primarily of alpha particles, not included in such calculations. Theoretical modeling of these results requires the consideration of cluster formation and medium modifications of cluster properties.
Current research on clustering in low density matter formed in near Fermi energy heavy ion collis... more Current research on clustering in low density matter formed in near Fermi energy heavy ion collisions is discussed Temperature and density dependent symmetry free energies derived from isoscaling analyses of the yields of nuclei with A ≤ 4 are far above those obtained in common effective interaction calculations, reflecting cluster formation, primarily of alpha particles, not included in such calculations.
Physical Review Letters, 2012