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37 results on '"Harca I. M."'

1. Deconstructing the emission order of protons, neutrons and $\alpha$-particles following fusion in $^{28,30,32}$Si + $^{28}$Si

Author

Kumar, Rohit, Desilets, H., Johnstone, J. E., Hudan, S., Chattopadhyay, D., deSouza, R. T., Ackermann, D., Basson, M., Brown, K. W., Chbihi, A., Cook, K. J., Famiano, M., Genard, T., Harca, I. M., and Paneru, S. N.

Subjects
Nuclear Experiment
Abstract

A high-quality measurement of proton and $\alpha$-particle emission associated with fusion of $^{28,30,32}$Si with a $^{28}$Si target is described. Evaporation residues produced by de-excitation of the compound nucleus were identified by an energy time-of-flight (ETOF) measurement while emitted light-charged particles were identified using the $\Delta$E-E technique. Comparison of the experimentally measured charged particle multiplicities and energy spectra with the predictions of the statistical decay model code, GEMINI++, allows one to deduce interesting details of the de-excitation cascade and its dependence on neutron-excess. The impact of modifying the sequence of particle emissions on the average energy and multiplicity is examined., Comment: 12 pages, 16 figures

Published
2025

2. Coulomb and nuclear excitations of $^{70}$Zn and $^{68}$Ni at intermediate energy

Author

Calinescu, S., Sorlin, O., Matea, I., Carstoiu, F., Dao, D., Nowacki, F., de Angelis, G., Astabatyan, R., Bagchi, S., Borcea, C., Borcea, R., Cáceres, L., Ciemála, M., Clément, E., Dombrádi, Z., Franchoo, S., Gottardo, A., Grévy, S., Guerin, H., Harakeh, M. N., Harca, I. M., Kamalou, O., Kmiecik, M., Krasznahorkay, A., Krzysiek, M., Kuti, I., Lepailleur, A., Lukyanov, S., Maj, A., Maslov, V., Mazurek, K., Morfouace, P., Mrazek, J., Negoita, F., Niikura, M., Olivier, L., Penionzhkevich, Y., Perrot, L., Petrone, C., Podolyák, Z., Rigollet, C, Roger, T., Rotaru, F., Sohler, D., Stanoiu, M., Stefan, I., Stuhl, L., Thomas, J. C., Vajta, Z., Vandebrouck, M., and Wieland, O.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The reduced transition probabilities $B(E2; 0^+_{g.s.}\rightarrow2_1^+,2^+_2)$ in $^{70}$Zn and the full $B(E2; 0^+_{g.s.}\rightarrow2^+)$ strength up to S$_n$=7.79 MeV in $^{68}$Ni have been determined at the LISE/GANIL facility using the Coulomb-excitation technique at intermediate beam energy on a $^{208}$Pb target. The $\gamma$ rays emitted in-flight were detected with an array of 46 BaF$_2$ crystals. The angles of the deflected nuclei were determined in order to disentangle and extract the Coulomb and nuclear contributions to the excitation of the 2$^+$ states. The measured $B(E2; 0^+_{g.s.}\rightarrow2_1^+)$ of 1432(124) e$^2$fm$^4$ for $^{70}$Zn falls in the lower part of the published values which clustered either around 1600 or above 2000 e$^2$fm$^4$, while the $B(E2; 0^+_{g.s.}\rightarrow2^+_2)$ of 53(7) e$^2$fm$^4$ agrees very well with the two published values. The relatively low $B(E2; 0^+_{g.s.}\rightarrow2_1^+)$ of 301(38) e$^2$fm$^4$ for $^{68}$Ni agrees with previous studies and confirms a local magicity at $Z=28, N=40$. Combining the results of the low-energy spectra of $^{68}$Ni and $^{70}$Zn and their shell-model interpretations, it is interesting to notice that four different shapes (spherical, oblate, prolate and triaxial) are present. Finally, a summed $E2$ strength of only about 150 e$^2$fm$^4$ has been found experimentally at high excitation energy, likely due to proton excitations across the $Z=28$ gap. The experimental distribution of this high-energy $E2$ excitation agrees with SM calculations, but its strength is about two times weaker.

Published
2021

5. 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

7. 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

8. 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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9. 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

10. Coulomb and nuclear excitations of Zn70 and Ni68 at intermediate energy

Author

Calinescu, S., primary, Sorlin, O., additional, Matea, I., additional, Carstoiu, F., additional, Dao, D. D., additional, Nowacki, F., additional, de Angelis, G., additional, Astabatyan, R., additional, Bagchi, S., additional, Borcea, C., additional, Borcea, R., additional, Cáceres, L., additional, Ciemála, M., additional, Clément, E., additional, Dombrádi, Z., additional, Franchoo, S., additional, Gottardo, A., additional, Grévy, S., additional, Guerin, H., additional, Harakeh, M. N., additional, Harca, I. M., additional, Kamalou, O., additional, Kmiecik, M., additional, Krasznahorkay, A., additional, Krzysiek, M., additional, Kuti, I., additional, Lepailleur, A., additional, Lukyanov, S., additional, Maj, A., additional, Maslov, V., additional, Mazurek, K., additional, Morfouace, P., additional, Mrazek, J., additional, Negoita, F., additional, Niikura, M., additional, Olivier, L., additional, Penionzhkevich, Y., additional, Perrot, L., additional, Petrone, C., additional, Podolyák, Z., additional, Rigollet, C., additional, Roger, T., additional, Rotaru, F., additional, Sohler, D., additional, Stanoiu, M., additional, Stefan, I., additional, Stuhl, L., additional, Thomas, J. C., additional, Vajta, Z., additional, Vandebrouck, M., additional, and Wieland, O., additional

Published
2021
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11. 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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12. 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

14. 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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15. Investigation on Competing Fission Modes in 178Pt* Produced by 36Ar + 142Nd Reaction up to High Excitation Energies.

Author

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

Abstract

The mass–energy distributions of binary fission fragments (FFs) of excited exotic nucleus 178Pt* were measured via the fusion reaction 36Ar + 142Nd at different beam energies within 158–222 MeV range using the double arm time-of-flight spectrometer CORSET. The analysis of mass–energy matrices reveals the presence of both asymmetric and symmetric modes corresponding to respective lower and higher total kinetic energy (TKE) of the fragments within 42–64 MeV excitation energy. The agreement of measured mass width with theoretical systematics and dominance of the associated symmetric TKE component at 93 MeV excitation energy indicates the significant predominance/suppression of symmetric/asymmetric mode, respectively. The most probable light and heavy mass peaks of asymmetric fission mode of 178Pt are spotted at 79 and 99 u, respectively. As inferred from the theory, the mass–TKE events observed at the highest measured excitation energy (93 MeV) endorse the presence of the fast-fission process in 178Pt* at high angular momentum. [ABSTRACT FROM AUTHOR]

Published
2021
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16. Erratum: Inverse quasifission in the reactions Gd 156,160 + W 186 (Physical Review C (2017) 96 (064621) DOI: 10.1103/PhysRevC.96.064621)

Author

Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., Vardaci, E., Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., and Vardaci, E.

Published
2018

17. 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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18. Inverse quasifission in the reactions Gd 156,160 + W 186

Author

Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., Vardaci, E., Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., and Vardaci, E.

Subjects
fission, quasifission, super heavy elements
Abstract

Background: Low-energy multinucleon transfer reactions may be used for production of new neutron-enriched heavy nuclei. Purpose: Our aim is to investigate the influence of proton (Z=82) and neutron (N=82, 126) shells as well as orientation effects on the formation of reaction products in the inverse quasifission process in the reactions 156,160Gd + 186W. Methods: Mass, energy, and angular distributions of primary binary fragments formed in the reactions 156Gd+186W at an energy of 878 MeV, and 160Gd+186W at 860 and 935 MeV, have been measured using the double-arm time-of-flight spectrometer CORSET at the U400 cyclotron of the Flerov Laboratory of Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR), Dubna. Results: Enhancement in the yield of products with masses 200–215 u has been found for both reactions. The cross sections of the formation of trans-target fragments with masses around 208 u are found to be about 10μb at the Coulomb barrier energy and reach the level of 0.5 mb at the energy above the barrier for side-to-side collision. Conclusions: The enhanced yield of products with masses heavier than the target mass confirms the important role of the closed shells at Z=82 and N=82, 126 in the inverse quasifission process in low-energy damped collisions. The orientation effect caused by the strong deformation of colliding nuclei can result in a gain in the yield of heavy target-like fragments.

Published
2017

20. 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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21. Reaction Studies with an Almost Total Absorption Gamma Spectrometer.

Author

Borcea, C., Petrone, C., Calinescu, S., Borcea, R., Boromiza, M., Harca, I. M ., Negret, A., Olacel, A., Rotaru, F., and Stanoiu, M.

Subjects
NUCLEAR reactions, SPECTROMETERS, MASS attenuation coefficients, NUCLEAR excitation, PROTONS, ALPHA rays, INELASTIC scattering
Abstract

A large volume NaI detector was used to lodge inside of a cylindrical opening, targets, subsequently bombarded by beams of the 9MV Tandem of IFIN-HH. The gamma response of the spectrometer allows in many cases to determine the total reaction cross section and even its parts due to inelastic scattering and fusion. Excitation functions have been measured for reactions induced by protons, alpha particles and 6Li ions on a several different targets up from near barrier energies. The device has potential for in beam measurements at (deep) below barrier energies. [ABSTRACT FROM AUTHOR]

Published
2019
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23. Inverse quasifission in the reactions Gd156,160+W186

Author

Kozulin, E. M., primary, Zagrebaev, V. I., additional, Knyazheva, G. N., additional, Itkis, I. M., additional, Novikov, K. V., additional, Itkis, M. G., additional, Dmitriev, S. N., additional, Harca, I. M., additional, Bondarchenko, A. E., additional, Karpov, A. V., additional, Saiko, V. V., additional, and Vardaci, E., additional

Published
2017
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24. THE REACTION 32S + 197Au NEAR THE INTERACTION BARRIER

Author

Harca, I. M., primary, Kozulin, E., additional, Vardaci, E., additional, Ashaduzzaman, M., additional, Borcea, C., additional, Bracco, A., additional, Brambilla, S., additional, Calinescu, S., additional, Camera, F., additional, Ciemala, M., additional, DeCanditiis, B., additional, Dorvaux, O., 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, Pulcini, A., 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
2017
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25. 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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26. The fusion-fission process in the reaction 34S+186W near the interaction barrier

Author

Harca, I. M., primary, Dmitriev, S., additional, Itkis, J., additional, Kozulin, E. M., additional, Knyazheva, G., additional, Loktev, T., additional, Novikov, K., additional, Azaiez, F., additional, Gottardo, A., additional, Matea, I., additional, Verney, D., additional, Chubarian, G., additional, Hanappe, F., additional, Piot, J., additional, Schmitt, C., additional, Trzaska, W. H., additional, and Vardaci, E., additional

Published
2015
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27. Production and investigation of neutron-rich Osmium isotopes with and around N=126 using gas flow transport method

Author

Novikov, K, primary, Kozulin, E M, additional, Harca, I M, additional, Dmitriev, S, additional, Flueras, A, additional, Greenlees, P, additional, Hanappe, F, additional, Khlebnikov, S V, additional, Loktev, T, additional, Maurer, J, additional, Nitto, A Di, additional, Pakarinen, J, additional, Ruotsalainen, P, additional, Sandzelius, M, additional, Sorri, J, additional, Sin, M, additional, Trzaska, W H, additional, Vardaci, E, additional, and Zagrebaev, V I, additional

Published
2014
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28. The Fusion-Fission process in the reaction 34S + 186W near the interaction barrier.

Author

Harca, I. M., Dmitriev, S., Itkis, J., Kozulin, E. M., Knyazheva, G., Loktev, T., Novikov, K., Azaiez, F., Gottardo, A., Matea, I., Verney, D., Chubarian, G., Hanappe, F., Piot, J., Schmitt, C., Trzaska, W. H., and Vardaci, E.

Subjects
*HYBRID reactors, *GAMMA ray spectrometer, *HEAVY nuclei, *TIME-of-flight spectrometry, FLEROV Laboratory of Nuclear Reactions (Dubna, Russia)
Abstract

The reaction 34S + 186W at Elab =160 MeV was investigated with the aim of diving into the features of the fusion-fission process. Gamma rays in coincidence with binary reaction fragments were measured using the high efficiency gamma-ray spectrometer ORGAM at the TANDEM Accelerator facility of I.P.N., Orsay, and the time-of-flight spectrometer for fission fragments (FF) registration CORSET of the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna. The coupling of the ORGAM and CORSET setups offers the unique opportunity of extracting details for characterizing the fusion-fission process and gives information regarding production of neutron-rich heavy nuclei. The FF-γ coincidence method is of better use then the γ - γ coincidence method when dealing with low statistic measurements and also offers the opportunity to precisely correct the Dopler shift for in-flight emitted gamma rays. Evidence of symmetric and asymmetric fission modes were observed in the mass and TKE distributions, occurring due to shell effects in the fragments. Coincident measurements allow for discrimination between the gamma rays by accepting a specific range within the mass distribution of the reaction products. Details regarding the experimental setup, methods of processing the acquisitioned data and preliminary results are presented. [ABSTRACT FROM AUTHOR]

Published
2015
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29. Coulomb and nuclear excitations of Zn 70 and Ni 68 at intermediate energy

Author

Calinescu, S., Sorlin, O., Matea, I., Carstoiu, F., Dao, D. D., Nowacki, F., de Angelis, G., Astabatyan, R., Bagchi, S., Borcea, C., Borcea, R., Cáceres, L., Ciemála, M., Clément, E., Dombrádi, Z., Franchoo, S., Gottardo, A., Grévy, S., Guerin, H., Harakeh, M. N., Harca, I. M., Kamalou, O., Kmiecik, M., Krasznahorkay, A., Krzysiek, M., Kuti, I., Lepailleur, A., Lukyanov, S., Maj, A., Maslov, V., Mazurek, K., Morfouace, P., Mrazek, J., Negoita, F., Niikura, M., Olivier, L., Penionzhkevich, Y., Perrot, L., Petrone, C., Podolyák, Z., Rigollet, C., Roger, T., Rotaru, F., Sohler, D., Stanoiu, M., Stefan, I., Stuhl, L., Thomas, J. C., Vajta, Z., Vandebrouck, M., and Wieland, O.

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30. 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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31. 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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32. 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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33. Challenging fission dynamics around the barrier: The case of $^{34}$S + $^{186}$W

Author

F. Hanappe, S. Calinescu, A. Gottardo, F. Azaiez, I. M. Harca, K. V. Novikov, E. M. Kozulin, I. M. Itkis, O. Dorvaux, Wladyslaw Henryk Trzaska, D. Verney, T. Loktev, Emanuele Vardaci, J. Piot, G. N. Knyazheva, C. Schmitt, I. Matea, A. A. Bogachev, C. Borcea, G. G. Chubarian, S. N. Dmitriev, C. Petrone, 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 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)-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), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Vardaci, Emanuele, Harca, I. M., Schmitt, C., Itkis, I., Knyazheva, G., Novikov, K., Bogachev, A., Dmitriev, S., Loktev, T., Azaiez, F., Matea, I., Verney, D., Gottardo, A., Dorvaux, O., Piot, J., Chubarian, G., Trzaska, W. H., Hanappe, F., Borcea, C., Calinescu, S., and Petrone, C.

Subjects
Physics, Nuclear and High Energy Physics, Field (physics), 010308 nuclear & particles physics, Fission, Hadron, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collision, Kinetic energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract

The current status of fission dynamics studies in heavy-ion collisions around the Coulomb barrier is illustrated with the 34S + 186W reaction. The fission-fragment mass and total kinetic energy were measured at the ALTO facility at IPN Orsay, France, with a dedicated set-up using the (v, E) approach. The measurement reveals the presence of an asymmetric fission component on top of a predominantly symmetric distribution. The asymmetric structure, pointed out for the first time, is discussed along with results of previous experiments studying the same reaction. While these analyses suggested the contribution from either quasi-fission or pre-equilibrium fission, we offer an alternative interpretation, in terms of shell-driven compound-nucleus fission. The present measurement demonstrates the critical influence of resolution when addressing puzzling cases, situated at the crossroads of the various channels opened in a heavy-ion collision. Current status in the field clearly calls for innovative measurements involving manifold correlations and new observables. The outcome of the attempt done in this work in this direction, based on the coincident measurement of prompt \( \gamma\)-rays is reported, and encouraging perspectives are discussed.

Published
2016
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34. The study of neutron-rich nuclei production in the region of the closed shell N=126 in the multi-nucleon transfer reaction 136Xe+208Pb

Author

E. Fioretto, J.M. Itkis, G. N. Knyazheva, D. Quero, Emanuele Vardaci, A. M. Stefanini, S. N. Dmitriev, J. J. Valiente-Dobón, E. M. Kozulin, Wladyslaw Henryk Trzaska, D. Montanari, E. Strano, J. Piot, I. M. Harca, Dieter Ackermann, G. G. Chubarian, G. Montagnoli, G. Pollarolo, L. Corradi, K. V. Novikov, T. Loktev, S. Szilner, F. Scarlassara, Tea Mijatović, 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), 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), Novikov, K., Harca, I. M., Kozulin, E. M., Dmitriev, S., Itkis, J., Knyazheva, G., Loktev, T., Corradi, L., Valiente Dobon, J., Fioretto, E., Montanari, D., Stefanini, A. M., Vardaci, Emanuele, Quero, Daniele, Montagnoli, G., Scarlassara, F., Strano, E., Pollarolo, G., Piot, J., Mijatović, T., Szilner, S., Ackermann, D., Chubarian, G., and Trzaska, W. H.

Subjects
History, nuclear astro-physics, Proton, Nuclear Theory, spektrometrit, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Education, Nuclear physics, Xenon, Nucleosynthesis, neutron-rich nuclei, 0103 physical sciences, Nuclear astrophysics, chemical elements, Neutron, 010306 general physics, Nuclear Experiment, Open shell, heavy neutron rich nuclei, PRISMA spectrometer, Physics, neutron shells, Spectrometer, 010308 nuclear & particles physics, beam lines, closed shells, Computer Science Applications, neutron beams, chemistry, time of flight, Atomic physics, Nucleon
Abstract

Expérience LNL/PRISMA; International audience; The unexplored area of heavy neutron rich nuclei is extremely important for nuclearastrophysics investigations and, in particular, for the understanding of the r-process ofastrophysical nucleogenesis. For the production of heavy neutron rich nuclei located along theneutron closed shell N=126 (probably the last "waiting point" in the r-process of nucleosynthesis)the low-energy multi-nucleon transfer reaction 136Xe+208Pb at Elab=870MeV was explored.Due to the stabilizing eect of the closed neutron shells in both nuclei, N=82 and N=126, andthe rather favorable proton transfer from lead to xenon, the light fragments formed in this processare well bound and the Q-value of the reaction is nearly zero.Measurements were performed with the PRISMA spectrometer in coincidence with an additionaltime-of-flight (ToF) arm on the +20 beam line of the PIAVE-ALPI accelerator in Legnaro, Italy.The PRISMA spectrometer allows identication of the A, Z and velocity of the projectile-likefragments (PLF), while the second arm gives access to the target-like fragments (TLF).Details on the experimental setup and preliminary results are reported.

Published
2016
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35. The fusion-fission process in the reaction 34S+186W near the interaction barrier

Author

J.M. Itkis, E. M. Kozulin, Wladyslaw Henryk Trzaska, I. M. Harca, G. N. Knyazheva, K. V. Novikov, Christian Schmitt, Andrea Gottardo, T. Loktev, E. Vardaci, S. N. Dmitriev, J. Piot, David Verney, Francis Hanappe, F. Azaiez, G. G. Chubarian, I. Matea, Harca, I. M., Dmitriev, S., Itkis, J., Kozulin, E. M., Knyazheva, G., Loktev, T., Novikov, K., Azaiez, F., Gottardo, A., Matea, I., Verney, D., Chubarian, G., Hanappe, F., Piot, J., Schmitt, C., Trzaska, W. H., Vardaci, Emanuele, 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), Livius Trache, Daniela Chesneanu, Calin Alexandru Ur, 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), and 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)

Subjects
Nuclear reaction, Physics, Spectrometer, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Coincidence, Nuclear physics, multi-modal fission, gamma spectroscopy, 0202 electrical engineering, electronic engineering, information engineering, shell effects, 020201 artificial intelligence & image processing, Neutron, Gamma spectroscopy, Nuclear Experiment, Nucleon, Fusion-fission
Abstract

International audience; The reaction 34S + 186W at Elab=160 MeV was investigated with the aim of diving into the features of thefusion-fission process. Gamma rays in coincidence with binary reaction fragments were measured using the high efficiencygamma-ray spectrometer ORGAM at the TANDEM Accelerator facility of I.P.N., Orsay, and the time-of-flight spectrometerfor fission fragments (FF) registration CORSET of the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna. The couplingof the ORGAM and CORSET setups offers the unique opportunity of extracting details for characterizing the fusion-fissionprocess and gives information regarding production of neutron-rich heavy nuclei. The FF-$\gamma$ coincidence method is of betteruse then the $\gamma$ - $\gamma$ coincidence method when dealing with low statistic measurements and also offers the opportunity toprecisely correct the Dopler shift for in-flight emitted gamma rays.Evidence of symmetric and asymmetric fission modes were observed in the mass and TKE distributions, occurring due toshell effects in the fragments. Coincident measurements allow for discrimination between the gamma rays by accepting aspecific range within the mass distribution of the reaction products. Details regarding the experimental setup, methods ofprocessing the acquisitioned data and preliminary results are presented.

Published
2015
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36. Production and investigation of neutron-rich Osmium isotopes with and around N=126 using gas flow transport method

Author

Mikael Sandzelius, S. V. Khlebnikov, M Sin, E. Vardaci, Francis Hanappe, E. M. Kozulin, Panu Ruotsalainen, Juha Sorri, Janne Pakarinen, Wladyslaw Henryk Trzaska, Paul Greenlees, J. Maurer, S. N. Dmitriev, Valery Zagrebaev, A Flueras, A. Di Nitto, I. M. Harca, K. V. Novikov, T. Loktev, Giorgio Giardina, Avazbek K Nasirov and Giuseppe Mandaglio, Novikov, K, Kozulin, E. M, Harca, I. M, Dmitriev, S, Flueras, A, Greenlees, P, Hanappe, F, Khlebnikov, S. V, Loktev, T, Maurer, J, Nitto, A. Di, Pakarinen, J, Ruotsalainen, P, Sandzelius, M, Sorri, J, Sin, M, Trzaska, W. H, Vardaci, Emanuele, Zagrebaev, V. I., and DI NITTO, Antonio

Subjects
History, Isotope, Chemistry, Physique, Radiochemistry, Nuclear Theory, chemistry.chemical_element, Coulomb barrier, gas flow transport method, Astronomie, Computer Science Applications, Education, Osmium isotopes, Osmium, Neutron, Nuclear Experiment, Volatility (chemistry)
Abstract

Neutron-rich isotopes of heavy nuclei are until now poorly studied. In this work we investigate neutron-rich osmium isotopes produced in multi-nucleon transfer reactions. The reaction 136Xe+208Pb at energy near Coulomb barrier is used for production of osmium isotopes. The CORSAR-V setup is used to record the characteristics of osmium isotopes. The separation of the reaction products is based on their respective volatility. Experimental results are presented and discussed. © Published under licence by IOP Publishing Ltd., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2014

37. Inverse quasifission in the reactions 156,160Gd+186W.

Author

Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., and Vardaci, E.

Subjects
*NEUTRONS, *ANGULAR distribution (Nuclear physics), *TUNGSTEN isotopes
Abstract

Background: Low-energy multinucleon transfer reactions may be used for production of new neutron-enriched heavy nuclei. Purpose: Our aim is to investigate the influence of proton (Z=82) and neutron (N=82, 126) shells as well as orientation effects on the formation of reaction products in the inverse quasifission process in the reactions 156,160Gd+186W. Methods: Mass, energy, and angular distributions of primary binary fragments formed in the reactions 156Gd+186W at an energy of 878 MeV, and 160Gd+186W at 860 and 935 MeV, have been measured using the double-arm time-of-flight spectrometer CORSET at the U400 cyclotron of the Flerov Laboratory of Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR), Dubna. Results: Enhancement in the yield of products with masses 200-215 u has been found for both reactions. The cross sections of the formation of trans-target fragments with masses around 208 u are found to be about 10 µb at the Coulomb barrier energy and reach the level of 0.5 mb at the energy above the barrier for side-to-side collision. Conclusions: The enhanced yield of products with masses heavier than the target mass confirms the important role of the closed shells at Z=82 and N=82, 126 in the inverse quasifission process in low-energy damped collisions. The orientation effect caused by the strong deformation of colliding nuclei can result in a gain in the yield of heavy target-like fragments. [ABSTRACT FROM AUTHOR]

Published
2017
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