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2. Multifragmentation in Collisions of 4.4gev-Deuterons with Gold Target

Author

Avdeyev, S. P., Karnaukhov, V. A., Oeschler, H., Kirakosyan, V. V., Rukoyatkin, P. A., Budzanowski, A., Karcz, W., Norbeck, E., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

The relative velocity correlation function of pairs of intermediate mass fragments has been studied for d+Au collitions at 4.4 GeV. Experimental correlation functions are compared to that obtained by multibody Coulomb trajectory calculations under the assumption of various decay timees of the fragmenting system. The combined approach with the empirically modified intranuclear cascade code followed by the statistical multifragmentation model was used to generate the starting conditions for these calculations. The fragment emossion time is found to be less than 40 fm/c., Comment: Accepted for publication in Bulletin of the Russian Academy of Sciences. Physics

Published
2010
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3. Critical temperature for the nuclear liquid-gas phase transition (from multifragmentation and fission)

Author

Karnaukhov, V. A., Oeschler, H., Budzanowski, A., Avdeyev, S. P., Botvina, A. S., Cherepanov, E. A., Karcz, W., Kirakosyan, V. V., Rukoyatkin, P. A., Skwirczynska, I., and Norbeck, E.

Subjects
Nuclear Experiment
Abstract

Critical temperature Tc for the nuclear liquid-gas phase transition is stimated both from the multifragmentation and fission data. In the first case,the critical temperature is obtained by analysis of the IMF yields in p(8.1 GeV)+Au collisions within the statistical model of multifragmentation (SMM). In the second case, the experimental fission probability for excited 188Os is compared with the calculated one with Tc as a free parameter. It is concluded for both cases that the critical temperature is higher than 16 MeV., Comment: 15 pages, 8 figures

Published
2008
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4. Time scale of the thermal multifragmentation in p(3.6 GeV) + Au collisions

Author

Avdeyev, S. P., Karnaukhov, V. A., Oeschler, H., Rodionov, V. K., Simonenko, A. V., Kirakosyan, V. V., Rukoyatkin, P. A., Budzanowski, A., Karcz, W., Skwirczynska, I., Czech, B., Kuzmin, E. A., Chulkov, L. V., Norbeck, E., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

The relative angle correlation of intermediate mass fragments has been studied for p+Au collisions at 3.6 GeV. Strong suppression at small angles is observed caused by IMF-IMF Coulomb repulsion. Experimental correlation function is compared to that obtained by the multi-body Coulomb trajectory calculations with the various decay time of fragmenting system. The combined model including the empirically modified intranuclear cascade followed by statistical multifragmentation was used to generate starting conditions for these calculations. The model dependence of the results obtained has been carefully checked. The mean decay time of fragmenting system is found to be 85 +- 50 fm/c., Comment: Proceedings of IWM 2005, Catania, Italy

Published
2006

5. Spinodal decomposition, nuclear fog and two characteristic volumes in thermal multifragmentation

Author

Karnaukhov, V. A., Oeschler, H., Avdeyev, S. P., Rodionov, V. K., Kirakosyan, V. V., Simonenko, A. V., Rukoyatkin, P. A., Budzanowski, A., Karcz, W., Skwirczynska, I., Kuzmin, E. A., Chulkov, L. V., Norbeck, E., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

Thermal multifragmentation of hot nuclei is interpreted as the nuclear liquid-fog phase transition inside the spinodal region. The experimental data for p(8.1GeV) + Au collisions are analyzed within the framework of the statistical multifragmentation model (SMM) for the events with emission of at least two IMFs. It is found that the partition of hot nuclei is specified after expansion to a volume equal to Vt = (2.6+-0.3) Vo, with Vo as the volume at normal density. However, the freeze-out volume is found to be twice as large: Vf = (5+-1) Vo., Comment: 8 pages, 6 figures, to be published in Nucl.Phys.A

Published
2004
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6. Two characteristic volumes in thermal nuclear multifragmentation

Author

Karnaukhov, V. A., Oeschler, H., Avdeyev, S. P., Rodionov, V. K., Kirakosyan, V. V., Simonenko, A. V., Rukoyatkin, P. A., Budzanowski, A., Karcz, W., Skwirczynska, I., Kuzmin, E. A., Chulkov, L. V., Norbeck, E., and Botvina, A. S.

Subjects
High Energy Physics - Experiment
Abstract

The paper is devoted to the experimental determination of the space-time characteristics for the target multifragmentation in p(8.1GeV) + Au collisions. The experimental data on the fragment charge distribution and kinetic energy spectra are analyzed within the framework of the statistical multifragmentation model. It is found that the partition of hot nuclei is specified after expansion of the target spectator to a volume equal to Vt = (2.9 +- 0.2) Vo, with Vo as the volume at normal density. However, the freeze-out volume is found to be Vf = (11 +- 3) Vo. At freeze-out, all the fragments are well separated and only the Coulomb force should be taken into account. The results are in accordance with a scenario of spinodal disintegration of hot nuclei., Comment: 11 pages, 4 figures, submitted to Phys.Rev.C

Published
2004
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7. Multifragmentation and nuclear phase transitions (liquid-fog and liquid-gas)

Author

Karnaukhov, V. A., Oeschler, H., Avdeyev, S. P., Rodionov, V. K., Simomenko, A. V., Kirakosyan, V. V., Budzanowski, A., Karcz, W., Skwirczynska, I., Kuzmin, E. A., Norbeck, E., and Botvina, A. S.

Subjects
Nuclear Experiment
Abstract

Thermal multifragmentation of hot nuclei is interpreted as the nuclear liquid-fog phase transition. The charge distributions of the intermediate mass fragments produced in p(3.6 GeV) + Au and p(8.1 GeV) + Au collisions are analyzed within the statistical multifragmentation model with the critical temperature for the nuclear liquid-gas phase transition Tc as a free parameter. The analysis presented here provides strong support for a value of Tc > 15 MeV., Comment: 4 pages, 2 figures, Submittet to Proc. of NN2003 to be published in Nucl. Phys. A

Published
2003
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10. Fission of Hg-180,Hg-182,Hg-183* and Pt-178* nuclei at intermediate excitation energies

Author

Kozulin E. M., Knyazheva G. N., Itkis I. M., Itkis M. G., Mukhamejanov Y. S., Bogachev A. A., Novikov K. V., Kirakosyan V. V., Kumar D., Banerjee T., Cheralu M., Maiti M., Prajapat R., Kumar R., Sarkar G., Trzaska W. H., Andreyev A. N., Harca I. M., Mitu A., Vardaci E., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Mukhamejanov, Y. S., Bogachev, A. A., Novikov, K. V., Kirakosyan, V. V., Kumar, D., Banerjee, T., Cheralu, M., Maiti, M., Prajapat, R., Kumar, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., Mitu, A., and Vardaci, E.

Abstract

Background: The nature of asymmetric fission of preactinides is not yet understood in detail, despite intense experimental and theoretical studies carried out at present. Purpose: The study of asymmetric and symmetric fission of Hg180,182,183 and Pt178 nuclei as a function of their excitation energy and isospin. Methods: Mass-energy distributions of fission fragments of Hg180, Pt178 (two protons less than Hg180), and Hg182 (two neutrons more than Hg180) formed in the Ar36+Sm144, Nd142, and Ca40+Nd142 reactions were measured at energies near and above the Coulomb barrier. Fission of Hg183 obtained in the reaction of Ca40 with Nd143 was also investigated to see if one extra neutron could lead to dramatic changes in the fission process due to the shape-staggering effect in radii, known in Hg183. The measurements were performed with the double-arm time-of-flight spectrometer CORSET. Results: The observed peculiarities in the fission fragment mass-energy distributions for all studied nuclei may be explained by the presence of a symmetric fission mode and three asymmetric fission modes, manifested by the different total kinetic energies and fragment mass splits. The yield of symmetric mode grows with increasing excitation energy of compound nucleus. Conclusions: The investigated properties of asymmetric fission of Hg180,182,183 and Pt178 nuclei point out the existence of well-deformed proton shell at Z≈36 and a less deformed proton shell at Z ≈ 46.

Published
2022

13. Asymmetric and symmetric fission of excited nuclei of Hg 180,190 and Pb 184,192,202 formed in the reactions with Ar 36 and Ca 40,48 ions

Author

Bogachev A. A., Kozulin E. M., Knyazheva G. N., Itkis I. M., Itkis M. G., Novikov K. V., Kumar D., Banerjee T., Diatlov I. N., Cheralu M., Kirakosyan V. V., Mukhamejanov Y. S., Pan A. N., Pchelintsev I. V., Tikhomirov R. S., Vorobiev I. V., Maiti M., Prajapat R., Kumar R., Sarkar G., Trzaska W. H., Andreyev A. N., Harca I. M., Vardaci E., Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Kumar, D., Banerjee, T., Diatlov, I. N., Cheralu, M., Kirakosyan, V. V., Mukhamejanov, Y. S., Pan, A. N., Pchelintsev, I. V., Tikhomirov, R. S., Vorobiev, I. V., Maiti, M., Prajapat, R., Kumar, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., and Vardaci, E.

Abstract

Background: Observation of asymmetric fission of Hg180 has led to intensive theoretical and experimental studies of fission of neutron-deficient nuclei in the lead region. Purpose: The study of asymmetric and symmetric fission modes of Hg180,190 and Pb184,192,202 nuclei. Methods: Mass-energy distributions of fission fragments of Hg180,190 and Pb184 formed in the Ar36+Sm144,154 and Ca40+Sm144 reactions, respectively, at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET and compared with previously measured Pb192,202 isotopes produced in the Ca48+Sm144,154 reactions. The mass distributions for Hg180,190 and Pb184,192,202 together with old data for Ir187, Au195, Hg198, Tl201, Bi205,207, Po210, and At213 [J. Nucl. Phys. 53, 1225 (1991)] have been decomposed into symmetric and asymmetric fission modes. The total kinetic-energy distributions for different fission fragment mass regions have been analyzed for Hg180,190 and Pb184. Results: The stabilization role of proton numbers at Z≈36, 38, Z≈45, 46, and Z=28/50 in asymmetric fission of excited preactinide nuclei has been observed. The high (≈145-MeV) and the low (≈128-MeV) energy components have been found in the total kinetic-energy distributions of Hg180,190 fission fragments corresponding to the fragments with proton numbers near Z≈46 and Z≈36, respectively. In the case of fission of Pb184 only the low-energy component (≈135MeV) for the fragments with masses corresponding to the proton numbers Z≈36 and 46 has been found. Conclusions: The studied properties of asymmetric fission of Hg180,190 and Pb184,192,202 nuclei point out the existence of well deformed proton shell at Z≈36 and less deformed proton shell at Z≈46.

Published
2021

14. Fission of Hg*180,182,183 and Pt*178 nuclei at intermediate excitation energies

Author

Kozulin, E. M., primary, Knyazheva, G. N., additional, Itkis, I. M., additional, Itkis, M. G., additional, Mukhamejanov, Y. S., additional, Bogachev, A. A., additional, Novikov, K. V., additional, Kirakosyan, V. V., additional, Kumar, D., additional, Banerjee, T., additional, Cheralu, M., additional, Maiti, M., additional, Prajapat, R., additional, Kumar, R., additional, Sarkar, G., additional, Trzaska, W. H., additional, Andreyev, A. N., additional, Harca, I. M., additional, Mitu, A., additional, and Vardaci, E., additional

Published
2022
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15. Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions

Author

Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Kumar, D., Banerjee, T., Diatlov, I. N., Cheralu, M., Kirakosyan, V. V., Mukhamejanov, Y. S., Pan, A. N., Pchelintsev, I. V., Tikhomirov, R. S., Vorobiev, I. V., Maiti, M., Prajapat, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., and Vardaci, E.

Published
2021

16. Asymmetric and symmetric fission of excited nuclei of Hg180,190 and Pb184,192,202 formed in the reactions with Ar36 and Ca40,48 ions

Author

Bogachev, A. A., primary, Kozulin, E. M., additional, Knyazheva, G. N., additional, Itkis, I. M., additional, Itkis, M. G., additional, Novikov, K. V., additional, Kumar, D., additional, Banerjee, T., additional, Diatlov, I. N., additional, Cheralu, M., additional, Kirakosyan, V. V., additional, Mukhamejanov, Y. S., additional, Pan, A. N., additional, Pchelintsev, I. V., additional, Tikhomirov, R. S., additional, Vorobiev, I. V., additional, Maiti, M., additional, Prajapat, R., additional, Kumar, R., additional, Sarkar, G., additional, Trzaska, W. H., additional, Andreyev, A. N., additional, Harca, I. M., additional, and Vardaci, E., additional

Published
2021
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19. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels (editors' suggestion)

Author

Vardaci E., Pulcini A., Kozulin E. M., Matea I., Verney D., Maj A., Schmitt C., Itkis I. M., Knyazheva G. N., Novikov K., Kozulina N., Harca I. M., Kolesov I. V., Saveleva K., Kirakosyan V. V., Dorvaux O., Ciemala M., Brambilla S., Ashaduzzaman M., De Canditiis B., Di Nitto A., Quero D., Parascandolo C., Pierroutsakou D., Rath P. K., Sposito G., La Rana G., Bracco A., Camera F., Stezowski O., Borcea C., Calinescu S., Petrone C., Wilson J., Vardaci, E., Pulcini, A., Kozulin, E. M., Matea, I., Verney, D., Maj, A., Schmitt, C., Itkis, I. M., Knyazheva, G. N., Novikov, K., Kozulina, N., Harca, I. M., Kolesov, I. V., Saveleva, K., Kirakosyan, V. V., Dorvaux, O., Ciemala, M., Brambilla, S., Ashaduzzaman, M., De Canditiis, B., Di Nitto, A., Quero, D., Parascandolo, C., Pierroutsakou, D., Rath, P. K., Sposito, G., La Rana, G., Bracco, A., Camera, F., Stezowski, O., Borcea, C., Calinescu, S., Petrone, C., and Wilson, J.

Abstract

The overlap in the mass symmetric region of the reaction products from fusion-fission and quasifission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The approach proposed here relies on the fact that fusion-fission and quasifission are characterized by different timescales. Within this framework, we performed a detailed study to find out how timescales can be probed via angular momentum transfer as measured via γ-ray multiplicities. The proof of principle was carried out by measuring the γ rays in coincidence with fusion-fission and quasielastic binary fragments in the reaction S32 + Au197 at beam energy near the Coulomb barrier. The experiment was performed at the Accélérateur Linéaire Tandem à Orsay (ALTO) facility at the Institut De Physique Nucléaire (IPN) in Orsay (France) using a detection setup consisting of ORGAM (ORsay GAMma) and PARIS (Photon Array Radioactive Ion Stable beams) γ-detectors arrays coupled with the CORSET (CORrelation SETup) time-of-flight spectrometer. Results of the sensitivity of this method to distinguish reaction channels with different dynamics are discussed.

Published
2020

22. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

Vardaci, E., primary, Pulcini, A., additional, Kozulin, E. M., additional, Matea, I., additional, Verney, D., additional, Maj, A., additional, Schmitt, C., additional, Itkis, I. M., additional, Knyazheva, G. N., additional, Novikov, K., additional, Kozulina, N., additional, Harca, I. M., additional, Kolesov, I. V., additional, Saveleva, K., additional, Kirakosyan, V. V., additional, Dorvaux, O., additional, Ciemala, M., additional, Brambilla, S., additional, Ashaduzzaman, M., additional, De Canditiis, B., additional, Di Nitto, A., additional, Quero, D., additional, Parascandolo, C., additional, Pierroutsakou, D., additional, Rath, P. K., additional, Sposito, G., additional, La Rana, G., additional, Bracco, A., additional, Camera, F., additional, Stezowski, O., additional, Borcea, C., additional, Calinescu, S., additional, Petrone, C., additional, and Wilson, J., additional

Published
2020
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23. Fission and Quasi-Fission Dynamics Near the Coulomb Barrier: γ Rays as Probe for their Timescale

Author

Pulcini, A., primary, Vardaci, E., additional, Kozulin, E. M., additional, Ashaduzzaman, M., additional, Borcea, C., additional, Bracco, A., additional, Brambilla, S., additional, Calinescu, S., additional, Camera, F., additional, Ciemala, M., additional, Davide, F., additional, de Canditiis, B., additional, Di Nitto, A., additional, Dmitriev, S., additional, Dorvaux, O., additional, Harca, I. M., additional, Itkis, I. M., additional, Kirakosyan, V. V., additional, Knyazheva, G., additional, Kozulina, N., additional, Kolesov, I. V., additional, La Rana, G., additional, Maj, A., additional, Matea, I., additional, Novikov, K., additional, Petrone, C., additional, Quero, D., additional, Rath, P. K., additional, Saveleva, E., additional, Schmitt, C., additional, Sposito, G., additional, Stezowski, O., additional, Trzaska, W. H., additional, and Wilson, J., additional

Published
2019
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24. Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier

Author

Pulcini, A, primary, Vardaci, E, additional, Kozulin, E, additional, Ashaduzzaman, M, additional, Borcea, C, additional, Bracco, A, additional, Brambilla, S, additional, Calinescu, S, additional, Camera, F, additional, Ciemala, M, additional, de Canditiis, B, additional, Dorvaux, O, additional, Harca, I M, additional, Itkis, I, additional, Kirakosyan, V V, additional, Knyazheva, G, additional, Kozulina, N, additional, Kolesov, I V, additional, La Rana, G, additional, Maj, A, additional, Matea, I, additional, Novikov, K, additional, Petrone, C, additional, Quero, D, additional, Rath, P, additional, Saveleva, E, additional, Schmitt, C, additional, Sposito, G, additional, Stezowski, O, additional, Trzaska, W H, additional, and Wilson, J, additional

Published
2018
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26. Features of the Fission Fragments Formed in the Heavy Ion induced 32S+197Au reaction near the interaction barrier.

Author

Kozulin, E. M., Harca, I. M., Vardaci, E., Matea, I., Maj, A., Itkis, I., Knyazheva, G., Novikov, K., Dorvaux, O., Ciemala, M., Brambilla, S., Kozulina, N., Kolesov, I. V., Saveleva, E., Kirakosyan, V. V., Schmitt, C., Borcea, C., Calinescu, S., Petrone, C., and Ashaduzzaman, M.

Subjects
HEAVY ions, DROPLETS, DEEP inelastic collisions, KINETIC energy, STATISTICAL models
Abstract

The features of fission fragments formed in the near barrier reaction 32 S + 197 Au ( E beam lab = 166 MeV ) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The γ -rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model. [ABSTRACT FROM AUTHOR]

Published
2020
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27. Source velocity at relativistic beams of4He

Author

Avdeyev, S. P., primary, Karnaukhov, V. A., additional, Karcz, W., additional, Kirakosyan, V. V., additional, Rukoyatkin, P. A., additional, Stegaylov, V. I., additional, Oeschler, H., additional, and Botvina, A. S., additional

Published
2016
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32. Two characteristic volumes in thermal nuclear multifragmentation

Author

Karnaukhov, V. A., primary, Oeschler, H., additional, Avdeyev, S. P., additional, Rodionov, V. K., additional, Kirakosyan, V. V., additional, Simonenko, A. V., additional, Rukoyatkin, P. A., additional, Budzanowski, A., additional, Karcz, W., additional, Skwirczyńska, I., additional, Kuzmin, E. A., additional, Chulkov, L. V., additional, Norbeck, E., additional, and Botvina, A. S., additional

Published
2004
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34. Features of the Fission Fragments Formed in the Heavy Ion induced $^{32}\hbox {S}$+$^{197}\hbox {Au}$ reaction near the interaction barrier

Author

G. N. Knyazheva, Emanuele Vardaci, O. Dorvaux, P.K. Rath, D. Verney, E. M. Kozulin, B. Decanditiis, S. Brambilla, E. Saveleva, D. Quero, G. La Rana, J. N. Wilson, S. Calinescu, N. I. Kozulina, C. Schmitt, I. M. Itkis, F. Camera, A. Bracco, K. V. Novikov, W. H. Trzaska, O. Stezowski, I. Matea, A. Pulcini, I. M. Harca, A. Di Nitto, M. Ciemala, V. V. Kirakosyan, C. Petrone, M. Ashaduzzaman, I. V. Kolesov, C. Borcea, A. Maj, 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), SPS, PARIS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Harca, I. M., Vardaci, E., Matea, I., Maj, A., Itkis, I., Knyazheva, G., Novikov, K., Dorvaux, O., Ciemala, M., Brambilla, S., Kozulina, N., Kolesov, I. V., Saveleva, E., Kirakosyan, V. V., Schmitt, C., Borcea, C., Calinescu, S., Petrone, C., Ashaduzzaman, M., Decanditiis, B., Pulcini, A., Quero, D., Rath, P., di Nitto, A., La Rana, G., Bracco, A., Camera, F., Stezowski, O., Wilson, J., Verney, D., and Trzaska, W. H.

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Semi-empirical mass formula, Yield (chemistry), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

International audience; The features of fission fragments formed in the near barrier reaction $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ ($E^\mathrm{lab}_\mathrm{beam}=166\,\hbox {MeV}$) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The $\gamma $-rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model.

Published
2020
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35. Fission and Quasi-Fission Dynamics Near the Coulomb Barrier: $\gamma$ Rays as Probe for their Timescale

Author

I. M. Itkis, C. Petrone, I. M. Harca, N. I. Kozulina, J. Wilson, P. K. Rath, A. Pulcini, B. de Canditiis, G. Sposito, O. Dorvaux, E. M. Kozulin, D. Quero, O. Stezowski, Wladyslaw Henryk Trzaska, C. Schmitt, I. V. Kolesov, A. Di Nitto, S. Calinescu, G. La Rana, F. Davide, S. Brambilla, E. Saveleva, F. Camera, M. Ashaduzzaman, V. V. Kirakosyan, A. Bracco, M. Ciemala, G. N. Knyazheva, S. N. Dmitriev, K. V. Novikov, Emanuele Vardaci, I. Matea, C. Borcea, A. Maj, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Penionzhkevich, Yu E, Yu G Sobolev, Pulcini, A., Vardaci, E., Kozulin, E. M., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., Davide, F., de Canditiis, B., Di Nitto, A., Dmitriev, S., Dorvaux, O., Harca, I. M., Itkis, I. M., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P. K., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission, Experiment-Nucl, Dynamics (mechanics), Theory-Nucl, Coulomb barrier, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasi-fission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The method proposed here relies on the fact that fusion-fission and quasifission are characterized by a different timescale. Within this framework we performed a detailed study to find out if timescales can be probed via angular momentum as measured via γ rays multiplicity. The proof of principle was carried out by measuring the γ rays in coincidence with two fragments in the reaction 32S + 197Au at beam energy near the Coulomb barrier. The experiment has been performed at the Tandem ALTO facility at IPN Orsay using a detection setup consisting of ORGAM and PARIS γ detector arrays coupled with the CORSET time-of-flight spectrometer. Preliminary results on the sensitivity of this method to distinguish reaction channels with different dynamics are discusses.

Published
2018
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36. Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier

Author

A. Bracco, E. M. Kozulin, B. de Canditiis, Wladyslaw Henryk Trzaska, I. M. Itkis, C. Petrone, Emanuele Vardaci, V. V. Kirakosyan, P. K. Rath, I. M. Harca, I. Matea, G. Sposito, S. Calinescu, O. Stezowski, C. Schmitt, A. Pulcini, D. Quero, James R. Wilson, N. I. Kozulina, G. La Rana, E. Saveleva, G. N. Knyazheva, K. V. Novikov, S. Brambilla, F. Camera, I. V. Kolesov, M. Ciemala, M. Ashaduzzaman, O. Dorvaux, C. Borcea, A. Maj, Giuseppe Mandaglio, Antonio Trifirò, Marina Trimarchi, Pulcini, A., Vardaci, E., Kozulin, E., Ashaduzzaman, M., Borcea, C., Bracco, A., Brambilla, S., Calinescu, S., Camera, F., Ciemala, M., De Canditiis, Bartolomeo, Dorvaux, O., Harca, I. M., Itkis, I., Kirakosyan, V. V., Knyazheva, G., Kozulina, N., Kolesov, I. V., La Rana, G., Maj, A., Matea, I., Novikov, K., Petrone, C., Quero, D., Rath, P., Saveleva, E., Schmitt, C., Sposito, G., Stezowski, O., Trzaska, W. H., Wilson, J., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Mandaglio, Giuseppe, Trifirò, Antonio, and Trimarchi, Marina

Subjects
Physics, History, Angular momentum, Spectrometer, 010308 nuclear & particles physics, Fission, Detector, gamma radiation, Gamma ray, Coulomb barrier, gammasäteily, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Computer Science Applications, Education, Nuclear physics, nuclear fission, fissio, nuclear physics, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, ydinfysiikka, Nuclear Experiment
Abstract

International audience; Compound nucleus fission and quasi-fission are both binary decay channels whose common properties make the experimental separation between them difficult. A way to achieve this separation could be to probe the angular momentum of the binary fragments. This can be done detecting gamma rays in coincidence with the two fragments. As a case study, the reaction 32S + 197Au near the Coulomb barrier has been performed at the Tandem ALTO facility at IPN ORSAY. ORGAM and PARIS, two different gamma detectors arrays, are coupled with the CORSET detector, a two-arm time-of-flight spectrometer. TOF-TOF data were analyzed to reconstruct the mass-energy distribution of the primary fragments coupled with gamma multiplicity and spectroscopic analysis. Preliminary results of will be shown.

Published
2018
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