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206 results on '"YORDANOV, O."'

1. Structure of the neutron mid-shell nuclei $^{111,113}_{\quad \ 47}$Ag$_{64,66}$

Author

Lalkovski, S., Stefanova, E. A., Kisyov, S., Korichi, A., Bazzacco, D., Bergström, M., Görgen, A., Herskind, B., Hübel, H., Jansen, A., Khoo, T. L., Kutsarova, T., Lopez-Martens, A., Minkova, A., Podolyák, Zs., Schönwasser, G., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

$^{111}$Ag and $^{113}$Ag were produced in induced fission reaction, where yrast and near-yrast states were populated. To interpret the new data the Interacting Boson-Fermion model was used. A good agreement with the experimental data is achieved, suggesting that the two Ag nuclei have a well developed collectivity, superimposed on $\pi g_{9/2}^{-3}$ excitations previously observed throughout the entire isotopic chain.

Published
2017
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3. Co-existing structures in 105Ru

Author

Lalkovski, S., Ivanova, D., Stefanova, E. A., Korichi, A., Petkov, P., Kownacki, J., Kutsarova, T., Minkova, A., Bazzacco, D., Bergstrom, M., Gorgen, A., Herskind, B., Hubel, H., Jansen, A., Kisyov, S., Khoo, T. L., Kondev, F. G., Lopez-Martens, A., Podolyak, Zs., Schonwasser, G., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

New positive-parity states, having a band-like structure, were observed in 105Ru. The nucleus was produced in induced fission reaction and the prompt gamma-rays, emitted from the fragments, were detected by the EUROBALL III multi-detector array. The partial scheme of excited 105Ru levels is analyzed within the Triaxial-Rotor-plus-Particle approach.

Published
2014
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4. Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of $^{238}$U projectiles at 1 A GeV

Author

Alvarez-Pol, H., Benlliure, J., Audouin, L., Casarejos, E., Cortina-Gil, D., Enqvist, T., Fernandez, B., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., Schmidt, K. -H., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

The production of heavy neutron-rich nuclei has been investigated using cold fragmentation reactions of $^{238}$U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer FRS at GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{205}$Pt, $^{207-210}$Au, $^{211-216}$Hg, $^{213-217}$Tl, $^{215-220}$Pb, $^{219-224}$Bi, $^{221-227}$Po, $^{224-229}$At, $^{229-231}$Rn and $^{233}$Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability., Comment: 5 pages, 2 figures

Published
2010
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5. Structural effects in the nuclide distributions of the residues of highly excited systems

Author

Napolitani, P., Rejmund, F., Tassan-Got, L., Ricciardi, M. V., Kelic, A., Schmidt, K. -H., Yordanov, O., ignatyuk, A. V., and villagrasa, C.

Subjects
Nuclear Experiment
Abstract

New data from GSI on the production-cross-section for fragmentation of the systems 56Fe+p and 56Fe+Ti at 1 A GeV revealed the appearance of even-odd staggering in the cross-section distribution for chains of isotopes with given N-Z. The staggering is strongly enhanced for the chain N=Z, it reduces as the production moves away from the N=Z chain, and it reverses for the most neutron-rich odd-A residues. These phenomena, observed in the residues of rather violent reactions, are related to structural effects in the level-densities below the particle-emission threshold., Comment: 4 pages, 2 figures. 10th Nuclear Physics Workshop of Marie and Pierre Curie, 24 - 28 Septembre 2003, Kazimierz Dolny (Poland)

Published
2010
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6. Extending the north-east limit of the chart of nuclides

Author

Benlliure, J., Alvarez-Pol, H., Kurtukian-Nieto, T., Schmidt, K. -H., Audouin, L., Blank, B., Becker, F., Casarejos, E., Cortina-Gil, D., Enqvist, T., Fernández, B., Fernández-Ordóñez, M., Giovinazzo, J., Henzlova, D., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

The existence of nuclei with exotic combinations of protons and neutrons provides fundamental information on the forces acting between nucleons. The maximum number of neutrons a given number of protons can bind, neutron drip line1, is only known for the lightest chemical elements, up to oxygen. For heavier elements, the larger its atomic number, the farther from this limit is the most neutron-rich known isotope. The properties of heavy neutron-rich nuclei also have a direct impact on understanding the observed abundances of chemical elements heavier than iron in our Universe. Above half of the abundances of these elements are thought to be produced in rapid-neutron capture reactions, r-process, taking place in violent stellar scenarios2 where heavy neutron-rich nuclei, far beyond the ones known up today, are produced. Here we present a major step forward in the production of heavy neutron-rich nuclei: the discovery of 73 new neutron-rich isotopes of chemical elements between tantalum (Z=72) and actinium (Z=89). This result proves that cold-fragmentation reactions3 at relativistic energies are governed by large fluctuations in isospin and energy dissipation making possible the massive production of heavy neutron-rich nuclei, paving then the way for the full understanding of the origin of the heavier elements in our Universe. It is expected that further studies providing ground and structural properties of the nuclei presented here will reveal further details on the nuclear shell evolution along Z=82 and N=126, but also on the understanding of the stellar nucleosyntheis r-process around the waiting point at A~190 defining the speed of the matter flow towards heavier fissioning nuclei.

Published
2010

7. Production of medium-mass neutron-rich nuclei in reactions induced by 136Xe projectiles at 1 A GeV on a beryllium target

Author

Benlliure, J., Fernandez-Ordonez, M., Audouin, L., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Henzlova, D., Henzl, V., Kelic, A., Leray, S., Napolitani, P., Pereira, J., Rejmund, F., Ricciardi, M. V., Schmidt, K. -H., Schmitt, C., Stephan, C., Tassan-Got, L., Volant, C., Villagrasa, C., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

Production cross sections of medium-mass neutron-rich nuclei obtained in the fragmentation of 136Xe projectiles at 1 A GeV have been measured with the FRagment Separator (FRS) at GSI. 125Pd was identified for the first time. The measured cross sections are compared to 238U fission yields and model calculations in order to determine the optimum reaction mechanism to extend the limits of the chart of the nuclides around the r-process waiting point at N=82., Comment: 9 pages, 6 figures

Published
2008
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8. Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1 A GeV

Author

Henzlova, D., Schmidt, K. -H., Ricciardi, M. V., Kelic, A., Henzl, V., Napolitani, P., Audouin, L., Benlliure, J., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Junghans, A., Jurado, B., Krasa, A., Kurtukian, T., Leray, S., Ordonez, M. F., Pereira, J., Pleskac, R., Rejmund, F., Schmitt, C., Stephan, C., Tassan-Got, L., Villagrasa, C., Volant, C., Wagner, A., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

This paper presents the nuclide cross sections and the longitudinal velocity distributions of residues produced in the reactions of 136Xe and 124Xe at 1 A GeV in a lead target, measured at the high-resolution magnetic spectrometer, the Fragment Separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z = 3 and Z = 56 for 136Xe and between Z = 5 and Z = 55 for 124Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A = 20, while more complex behaviour is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range., Comment: 31 pages, 9 figures, 1 table, background information on http://www.gsi.de/charms

Published
2008
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9. First access to beta half-lives approaching the r-process path near N=126

Author

Kurtukian-Nieto, T., Benlliure, J., Audouin, L., Becker, F., Blank, B., Borzov, I. N., Casarejos, E., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Langanke, K., Martinez-Pinedo, G., Pereira, J., Rejmund, F., Schmidt, K. -H., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

Heavy neutron-rich nuclei close to N=126 were produced by fragmentation of a 1 A GeV 208Pb beam at the FRS at GSI. The beta-decay half-lives of 8 nuclides have been determined. The comparison of the data with model calculations including an approach based on the self-consistent ground-state description and continuum QRPA considering the Gamow-Teller and first-forbidden decays provide a first indication on the importance of first-forbidden transitions around A=195. The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei is faster than previously expected., Comment: 4 pages, 4 figures

Published
2007

10. Coincidence measurement of residues and light particles in the reaction 56Fe+p at 1 GeV per nucleon with SPALADIN

Author

Gentil, E. Le, Aumann, T., Bacri, C. O., Benlliure, J., Bianchin, S., Böhmer, M., Boudard, A., Brzychczyk, J., Casarejos, E., Combet, M., Donadille, L., Ducret, J. E., Fernandez-Ordoñez, M., Gernhäuser, R., Johansson, H., Kezzar, K., Kurtukian-Nieto, T., Lafriakh, A., Lavaud, F., Fèvre, A. Le, Leray, S., Lühning, J., Lukasik, J., Lynen, U., Müller, W. F., Pawlowski, P., Pietri, S., Rejmund, F., Schwarz, C., Sfienti, C., Simon, H., Trautmann, W., Volant, C., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

The spallation of $^{56}$Fe in collisions with hydrogen at 1 A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross-section into the different possible de-excitation channels. Detailed information on the evolution of these de-excitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several de-excitation models coupled to the INCL4 intra-nuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data., Comment: 4 pages, 5 figures, revised version accepted in Phys. Rev. Lett

Published
2007
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11. Measurement of the complete nuclide production and kinetic energies of the system 136Xe + hydrogen at 1 GeV per nucleon

Author

Napolitani, P., Schmidt, K. -H., Tassan-Got, L., Armbruster, P., Enqvist, T., Heinz, A., Henzl, V., Henzlova, D., Kelic, A., Pleskac, R., Ricciardi, M. V., Schmitt, C., Yordanov, O., Audouin, L., Bernas, M., Lafriaskh, A., Rejmund, F., Stephan, C., Benlliure, J., Casarejos, E., Ordonez, M. Fernandez, Pereira, J., Boudard, A., Fernandez, B., Leray, S., Villagrasa, C., and Volant, C.

Subjects
Nuclear Experiment
Abstract

We present an extensive overview of production cross sections and kinetic energies for the complete set of nuclides formed in the spallation of 136Xe by protons at the incident energy of 1 GeV per nucleon. The measurement was performed in inverse kinematics at the FRagment Separator (GSI, Darmstadt). Slightly below the Businaro-Gallone point, 136Xe is the stable nuclide with the largest neutron excess. The kinematic data and cross sections collected in this work for the full nuclide production are a general benchmark for modelling the spallation process in a neutron-rich nuclear system, where fission is characterised by predominantly mass-asymmetric splits., Comment: 18 pages, 14 figures

Published
2007
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12. Spallation Residues in the Reaction 56Fe + p at 0.3, 0.5, 0.75, 1.0 and 1.5 A GeV

Author

Villagrasa-Canton, C., Boudard, A., Ducret, J. -E., Fernandez, B., Leray, S., Volant, C., Armbruster, P., Enqvist, T., Hammache, F., Helariutta, K., Jurado, B., Ricciardi, M. -V., Schmidt, K. -H., Summerer, K., Vives, F., Yordanov, O., Audouin, L., Bacri, C. -O., Ferrant, L., Napolitani, P., Rejmund, F., Stephan, C., Tassan-Got, L., Benlliure, J., Casarejos, E., Fernandez-Ordonez, M., Pereira, J., Czajkowski, S., Karamanis, D., Pravikoff, M., George, J. S., Mewaldt, R. A., Yanasak, N., Wiedenbeck, M., Connell, J. J., Faestermann, T., Heinz, A., and Junghans, A.

Subjects
Nuclear Experiment
Abstract

The spallation residues produced in the bombardment of 56}Fe at 1.5, 1.0, 0.75, 0.5 and 0.3 A GeV on a liquid-hydrogen target have been measured using the reverse kinematics technique and the Fragment Separator at GSI (Darmstadt). This technique has permitted the full identification in charge and mass of all isotopes produced with cross-sections larger than 10^{-2} mb down to Z=8. Their individual production cross-sections and recoil velocities at the five energies are presented. Production cross-sections are compared to previously existing data and to empirical parametric formulas, often used in cosmic-ray astrophysics. The experimental data are also extensively compared to different combinations of intra-nuclear cascade and de-excitation models. It is shown that the yields of the lightest isotopes cannot be accounted for by standard evaporation models. The GEMINI model, which includes an asymmetric fission decay mode, gives an overall good agreement with the data. These experimental data can be directly used for the estimation of composition modifications and damages in materials containing iron in spallation sources. They are also useful for improving high precision cosmic-ray measurements., Comment: Submited to Phys. Rev. C (10/2006)

Published
2006
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13. Systematic comparison of ISOLDE-SC yields with calculated in-target production rates

Author

Lukic, S., Gevaert, F., Kelic, A., Ricciardi, M. V., Schmidt, K. -H., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

Recently, a series of dedicated inverse-kinematics experiments performed at GSI, Darmstadt, has brought an important progress in our understanding of proton and heavy-ion induced reactions at relativistic energies. The nuclear reaction code ABRABLA that has been developed and benchmarked against the results of these experiments has been used to calculate nuclide production cross sections at different energies and with different targets and beams. These calculations are used to estimate nuclide production rates by protons in thick targets, taking into account the energy loss and the attenuation of the proton beam in the target, as well as the low-energy fission induced by the secondary neutrons. The results are compared to the yields of isotopes of various elements obtained from different targets at CERN-ISOLDE with 600 MeV protons, and the overall extraction efficiencies are deduced. The dependence of these extraction efficiencies on the nuclide half-life is found to follow a simple pattern in many different cases. A simple function is proposed to parameterize this behavior in a way that quantifies the essential properties of the extraction efficiency for the element and the target - ion-source system in question., Comment: 46 pages, 49 figures, background information on http://www-w2k.gsi.de/charms/

Published
2006
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14. Light Nuclides Produced in the Proton-Induced Spallation of 238U at 1 GeV

Author

Ricciardi, M. V., Armbruster, P., Benlliure, J., Bernas, M., Boudard, A., Czajkowski, S., Enqvist, T., Kelic, A., Leray, S., Legrain, R., Mustapha, B., Pereira, J., Rejmund, F., Schmidt, K. -H., Stephan, C., Tassan-Got, L., Volant, C., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

The production of light and intermediate-mass nuclides formed in the reaction 1H+238U at 1 GeV was measured at the Fragment Separator (FRS) at GSI, Darmstadt. The experiment was performed in inverse kinematics, shooting a 1 A GeV 238U beam on a thin liquid-hydrogen target. 254 isotopes of all elements in the range from Z=7 to Z=37 were unambiguously identified, and the velocity distributions of the produced nuclides were determined with high precision. The results show that the nuclides are produced in a very asymmetric binary decay of heavy nuclei originating from the spallation of uranium. All the features of the produced nuclides merge with the characteristics of the fission products as their mass increases., Comment: 40 pages, 16 figures, 3 tables

Published
2005
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15. Complex nuclear-structure phenomena revealed from the nuclide production in fragmentation reactions

Author

Ricciardi, M. V., Ignatyuk, A. V., Kelic, A., Napolitani, P., Rejmund, F., Schmidt, K. -H., and Yordanov, O.

Subjects
Nuclear Experiment
Abstract

Complex structural effects in the nuclide production from the projectile fragmentation of 1 A GeV 238U nuclei in a titanium target are reported. The structure seems to be insensitive to the excitation energy induced in the reaction. This is in contrast to the prominent structural features found in nuclear fission and in transfer reactions, which gradually disappear with increasing excitation energy. Using the statistical model of nuclear reactions, relations to structural effects in nuclear binding and in the nuclear level density are demonstrated., Comment: 19 pages, 14 figures, background information on http://www-w2k.gsi.de/kschmidt/

Published
2003
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16. Comment on Mean First Passage Time for Nuclear Fission and the Emission of Light Particles

Author

Schmidt, K. -H., Benlliure, J., Boilley, D., Heinz, A., Junghans, A., Jurado, B., Kelic, A., Pereira, J., Schmitt, C., and Yordanov, O.

Subjects
Nuclear Theory
Abstract

Theoretical methods, interpretations and conclusions on the fission dynamics in a recent publication of H. Hofmann and F. A. Ivanyuk on the mean first passage time are critically considered., Comment: 2 pages

Published
2003

18. Electromagnetic Transition Strengths in 104CD and 101AG and Their Interpretation within the Interacting Boson (Fermion) Plus Broken Pair Model

Author

Jungclaus, A., Müller, G. A., Galindo, E., Yordanov, O., Hausmann, M., Kast, D., Lieb, K. P., Brant, S., Krstic, V., Vretenar, D., Algora, A., Brandolini, F., De Angelis, G., De Poli, M., Fahlander, C., Gadea, A., Martinez, T., Napoli, D. R., Dewald, A., Peusquens, R., Tiesler, H., Gorska, M., Grawe, H., Nazarewicz, Witold, editor, and Vretenar, Dario, editor

Published
2002
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20. Fast-timing measurements in neutron-rich odd-mass zirconium isotopes using LaBr3:Ce detectors coupled with Gammasphere

Author

Gamba E.R., Lalkovski S., Rudigier M., Bruce A.M., Bottoni S., Carpenter M.P., Zhu S., Ayangeakaa A.D., Anderson J.T., Berry T.A., Burrows I., Carroll R.J., Copp P., Carmona Gallardo M., Cullen D.M., Daniel T., Greene J.P., Gurgi L.A., Hartley D.J., Ilieva R., Ilieva S., Janssens R.V.F., Kondev F.G., Kröll T., Lane G.J., Lauritsen T., Lazarus I., Lotay G., Fernández Martínez G., Podolyák Zs., Pucknell V., Reed M., Regan P.H., Rohrer J., Sethi J., Seweryniak D., Shand C.M., Simpson J., Smolen M., Stefanova E.A., Vedia V., and Yordanov O.

Subjects
Physics, QC1-999
Abstract

A fast-timing experiment was performed at the Argonne National Laboratory to measure the lifetimes of the lowest lying states of nuclei belonging to the deformed regions around mass number A≃110 and A≃150. These regions were populated via spontaneous fission of 252Cf and the gamma radiation following the decay of excited states in the fission fragments was measured using 51 Gammasphere detectors coupled with 25 LaBr3:Ce detectors. A brief description of the acquisition system and some preliminary results from the fast-timing analysis of the fission fragment 100Zr are presented. The lifetime value of τ = 840(65) ps was found for the 2+ state in 100Zr consistent within one standard deviation of the adopted value with 791 +26 -35ps. This is associated with a quadrupole deformation parameter of 0.36(2) which is within one standard deviation of the literature value of 0.3556+82 -57.

Published
2018
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21. Structure of the low-lying states in Pd99,101,103,105

Author

Ivanova, D., primary, Lalkovski, S., additional, Costache, C., additional, Kisyov, S., additional, Mihai, C., additional, Mǎrginean, N., additional, Petkov, P., additional, Atanasova, L., additional, Bucurescu, D., additional, Cakirli, R. B., additional, Carpenter, M. P., additional, Casten, R. F., additional, Cǎta-Danil, Gh., additional, Cǎta-Danil, I., additional, Deleanu, D., additional, Filipescu, D., additional, Florea, N., additional, Gheorghe, I., additional, Ghiţǎ, D., additional, Glodariu, T., additional, Kondev, F. G., additional, Lica, R., additional, Mǎrginean, R., additional, Negret, A., additional, Pascu, S., additional, Sava, T., additional, Stefanova, E. A., additional, Stroe, L., additional, Suliman, G., additional, Suvaila, R., additional, Yordanov, O., additional, and Zamfir, N. V., additional

Published
2022
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24. First results studying the transmutation of 129I, 237Np, 238Pu, and 239Pu in the irradiation of an extended natU/Pb-assembly with 2.52 GeV deuterons

Author

Krivopustov, M. I., Pavliouk, A. V., Kovalenko, A. D., Mariin, I. I., Elishev, A. F., Adam, J., Kovalik, A., Batusov, Yu. A., Kalinnikov, V. G., Brudanin, V. B., Chaloun, P., Tsoupko-Sitnikov, V. M., Solnyshkin, A. A., Stegailov, V. I., Gerbish, Sh., Svoboda, O., Dubnicka, Z., Kala, M., Kloc, M., Krasa, A., Kugler, A., Majerle, M., Wagner, V., Brandt, R., Westmeier, W., Robotham, H., Siemon, K., Bielewicz, M., Kilim, S., Szuta, M., Strugalska-Gola, E., Wojeciechowski, A., Hashemi-Nezhad, S. R., Manolopoulou, M., Fragopolou, M., Stoulos, S., Zamani-Valasiadou, M., Jokic, S., Katovsky, K., Schastny, O., Zhuk, I. V., Potapenko, A. S., Safronova, A. A., Lukashevich, Zh. A., Voronko, V. A., Sotnikov, V. V., Sidorenko, V. V., Ensinger, W., Severin, H. D., Batsev, S., Kostov, L., Protokhristov, Kh., Stoyanov, Ch., Yordanov, O., Zhivkov, P. K., Kumar, A. V., Sharma, M., Khilmanovich, A. M., Marcinkevich, B. A., Korneev, S. V., Damdinsuren, Ts., Togoo, Ts., Kumawat, H., and Collaboration “Energy plus Transmutation”

Published
2009
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25. Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation

Author

Caama no, M., Walker, P. M., Regan, P. H., Pfützner, M., Podolyák, Zs., Gerl, J., Hellström, M., Mayet, P., Mineva, M. N., Aprahamian, A., Benlliure, J., Bruce, A. M., Butler, P. A., Cortina Gil, D., Cullen, D. M., Döring, J., Enqvist, T., Fox, C., Garcés Narro, J., Geissel, H., Gelletly, W., Giovinazzo, J., Górska, M., Grawe, H., Grzywacz, R., Kleinböhl, A., Korten, W., Lewitowicz, M., Lucas, R., Mach, H., O’Leary, C. D., De Oliveira, F., Pearson, C. J., Rejmund, F., Rejmund, M., Sawicka, M., Schaffner, H., Schlegel, C., Schmidt, K., Schmidt, K. -H., Stevenson, P. D., Theisen, Ch., Vivès, F., Warner, D. D., Wheldon, C., Wollersheim, H. J., Wooding, S., Xu, F., and Yordanov, O.

Published
2005
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27. Fast-timing measurements in the ground-state band of ¹¹⁴Pd

Author

Gamba, E. R., Bruce, A. M., Lalkovski, S., Rudigier, M., Bottoni, S., Carpenter, M. P., Zhu, S., Anderson, J. T., Ayangeakaa, A. D., Berry, T. A., Burrows, I., Gallardo, M. Carmona, Carroll, R. J., Copp, P., Cullen, D. M., Daniel, T., Martínez, G. Fernández, Greene, J. P., Gurgi, L. A., Hartley, D. J., Ilieva, R., Ilieva, S., Kondev, F. G., Kröll, T., Lane, G. J., Lauritsen, T., Lazarus, I., Lotay, G., Niţă, C. R., Podolyak, Zs., Pucknell, V., Reed, M., Regan, P. H., Rohrer, J., Sethi, J., Seweryniak, D., Shand, C. M., Simpson, J., Smoleń, M., Stefanova, E. A., Vedia, V., and Yordanov, O.

Abstract

Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in ¹¹⁴Pd populated via ²⁵²Cf decay, have been measured. The measured lifetimes are τ₂+=103(10)ps, τ₄+=22(13)ps, and τ₆+≤10ps for the 2⁺₁, 4⁺₁, and 6⁺₁ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J−2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E₂)=B(E2;4⁺₁→2⁺₁)/B(E2;2⁺₁→0⁺₁)=0.80(42) is measured for the first time in ¹¹⁴Pd and compared with the known values RB(E₂) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

Published
2019

28. Fast-timing measurements in the ground-state band of Pd 114

Author

Rohrer, J., Regan, P.H., Ayangeakaa, A.D., Gurgi, L.A., Berry, T.A., Sethi, J., Carpenter, M.P., Bruce, A.M., Carmona Gallardo, M., Vedia, V., Lauritsen, T., Greene, J.P., Shand, C.M., Anderson, J.T., Rudigier, M., Ilieva, S., Copp, P., Lazarus, I., Smoleń, M., Simpson, J., Kondev, F.G., Pucknell, V., Gamba, E.R., Kröll, T., Yordanov, O., Niţǎ, C.R., Stefanova, E.A., Reed, M., Lalkovski, S., Fernández Martínez, G., Seweryniak, D., Ilieva, R., Hartley, D.J., Daniel, T., Lotay, G., Bottoni, S., Cullen, D.M., Burrows, I., Zhu, S., Lane, G.J., Carroll, R.J., and Podolyák, Z.

Abstract

Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in Pd114, populated via Cf252 decay, have been measured. The measured lifetimes are τ2+=103(10)ps, τ4+=22(13)ps, and τ6+≤10ps for the 21+, 41+, and 61+ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J-2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E2)=B(E2;41+→21+)/B(E2;21+→01+)=0.80(42) is measured for the first time in Pd114 and compared with the known values RB(E2) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

Published
2019
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29. Fast-timing measurements in the ground-state band of Pd114

Author

Gamba, E. R., primary, Bruce, A. M., additional, Lalkovski, S., additional, Rudigier, M., additional, Bottoni, S., additional, Carpenter, M. P., additional, Zhu, S., additional, Anderson, J. T., additional, Ayangeakaa, A. D., additional, Berry, T. A., additional, Burrows, I., additional, Gallardo, M. Carmona, additional, Carroll, R. J., additional, Copp, P., additional, Cullen, D. M., additional, Daniel, T., additional, Martínez, G. Fernández, additional, Greene, J. P., additional, Gurgi, L. A., additional, Hartley, D. J., additional, Ilieva, R., additional, Ilieva, S., additional, Kondev, F. G., additional, Kröll, T., additional, Lane, G. J., additional, Lauritsen, T., additional, Lazarus, I., additional, Lotay, G., additional, Niţă, C. R., additional, Podolyák, Zs., additional, Pucknell, V., additional, Reed, M., additional, Regan, P. H., additional, Rohrer, J., additional, Sethi, J., additional, Seweryniak, D., additional, Shand, C. M., additional, Simpson, J., additional, Smoleń, M., additional, Stefanova, E. A., additional, Vedia, V., additional, and Yordanov, O., additional

Published
2019
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30. Investigating the intra-nuclear cascade process using the reaction 136Xe on deuterium at 500 AMeV

Author

Rejmund F., Ricciardi M.V., Pleskač R., Pereira J., Napolitani P., Leray S., Lafriaskh A., Kelić A., Henzlova D., Henzl V., Heinz A., Fernández Ordóñez M., Fernández-Domínguez B., Enqvist T., Casarejos E., Boudard A., Bernas M., Audouin L., Armbruster P., Pérez-Loureiro D., Benlliure J., Alcántara-Núñez J.A., Stéphan C., Schmidt K.-H., Schmitt C., Tassan-Got L., Villagrasa C., Volant C., and Yordanov O.

Subjects
Physics, QC1-999
Abstract

More than 600 residual nuclei, formed in the spallation of 136Xe projectiles impinging on deuterium at 500 AMeV of incident energy, have been unambiguously identified and their production cross sections have been determined with high accuracy. By comparing these data to others previously measured for the reactions 136Xe + p at 1 AGeV and 136Xe + p at 500 AMeV we investigated the role that neutrons play in peripheral collisions and to understand the energy dissipation in frontal collisions in spallation reactions.

Published
2010
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31. Structure of the neutron mid-shell nuclei 111,11347Ag64,66

Author

Lalkovski, S., Stefanova, E.A., Kisyov, S., Korichi, A., Bazzacco, D., Bergstrom, M., Gorgen, A., Herskind, B., Hubel, H., Jansen, A., Khoo, T.L., Kutsarova, T., Lopez-Martens, A., Minkova, A., Podolyak, Zsolt, Schonwasser, G., and Yordanov, O.

Subjects
Condensed Matter::Quantum Gases, Nuclear Theory, Nuclear Experiment
Abstract

111Ag and 113Ag were produced in induced fission reaction, where yrast and near-yrast states were populated. To interpret the new data the Interacting Boson-Fermion model was used. A good agreement with the experimental data is achieved, suggesting that the two Ag nuclei have a well developed collectivity, superimposed on \pi g9/2-3 excitations previously observed throughout the entire isotopic chain.

Published
2017

32. Isotopic production cross sections of residual nuclei in the spallation reaction $^{136}$Xe(200$A$ MeV)+ $p$

Author

Paradela, C., Tassan-Got, L., Benlliure, J., Rodríguez-Sánchez, J.L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., Ducret, J.E., Farget, F., Fernández-Domínguez, B., Fernández Ordóñez, M., Giot, L., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Pérez-Loureiro, D., Ricciardi, M.V., Stéphan, C., Schmidt, K.H., Schmitt, C., Villagrasa, C., Volant, C., Yordanov, O., 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory, Physics::Accelerator Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The residual nuclei produced in the spallation reaction of $^{136}$Xe nuclei at 200A MeV on protons have been studied by measuring the isotopic distributions for the elements from cadmium (Z=48) to cesium (Z=55) by using the fragment separator (FRS) spectrometer at GSI and the inverse kinematics technique. This is one of the few measurements performed at such a low projectile energy, close to the validity limit for intranuclear cascade models such as incl or isabel. The experimental results have been compared to these intranuclear cascade codes coupled to the evaporation code abla. Both code combinations reproduce qualitatively the measured isotopic distributions; however, both underestimate the production of residues with mass numbers between 126 and 134. The measured cross sections are of interest for the planning of future radioactive beam or neutron source facilities.

Published
2017
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34. Fast-timing Measurements in $^{100}$Zr Using LaBr$_{3}$(Ce) Detectors Coupled with Gammasphere

Author

Gamba, E.R., primary, Bruce, A.M., additional, Rudigier, M., additional, Lalkovski, S., additional, Bottoni, S., additional, Carpenter, M.P., additional, Zhu, S., additional, Ayangeakaa, A.D., additional, Anderson, J.T., additional, Berry, T.A., additional, Burrows, I., additional, Carrol, R.J., additional, Copp, P., additional, Carmona Gallardo, M., additional, Cullen, D.M., additional, Daniel, T., additional, Fernández Martínez, G., additional, Greene, J.P., additional, Gurgi, L.A., additional, Hartley, D.J., additional, Ilieva, R., additional, Ilieva, S., additional, Janssens, R.V.F., additional, Kondev, F.G., additional, Kröll, T., additional, Lane, G.J., additional, Lauritsen, T., additional, Lazarus, I., additional, Lotay, G., additional, Niţă, C.R., additional, Podolyák, Zs., additional, Pucknell, V., additional, Reed, M., additional, Regan, P.H., additional, Rohrer, J., additional, Sethi, J., additional, Seweryniak, D., additional, Shand, C.M., additional, Simpson, J., additional, Smoleń, M., additional, Vedia, V., additional, Stefanova, E.A., additional, and Yordanov, O., additional

Published
2018
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35. Structure of the neutron mid-shell nuclei 111,11347 Ag64,66

Author

Lalkovski, S., Stefanova, E. A., Kisyov, S., Korichi, A., Bazzacco, D., Bergstrom, M., Gorgen, A., Herskind, B., Hubel, H., Jansen, A., Khoo, T. L., Kutsarova, T., Lopez-Martens, A., Minkova, A., Podolyak, Zs., Schonwasser, G., Yordanov, O., Lalkovski, S., Stefanova, E. A., Kisyov, S., Korichi, A., Bazzacco, D., Bergstrom, M., Gorgen, A., Herskind, B., Hubel, H., Jansen, A., Khoo, T. L., Kutsarova, T., Lopez-Martens, A., Minkova, A., Podolyak, Zs., Schonwasser, G., and Yordanov, O.

Published
2017

36. Structure of the neutron mid-shell nuclei Ag64,66111,113

Author

Lalkovski, S., primary, Stefanova, E. A., additional, Kisyov, S., additional, Korichi, A., additional, Bazzacco, D., additional, Bergström, M., additional, Görgen, A., additional, Herskind, B., additional, Hübel, H., additional, Jansen, A., additional, Khoo, T. L., additional, Kutsarova, T., additional, Lopez-Martens, A., additional, Minkova, A., additional, Podolyák, Zs., additional, Schönwasser, G., additional, and Yordanov, O., additional

Published
2017
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37. Fast Timing Measurement Using an LaBr$_3$(Ce) Scintillator Detector Array Coupled with Gammasphere

Author

Rudigier, M., primary, Lalkovski, S., additional, Gamba, E.R., additional, Bruce, A.M., additional, Podolyak, Zs., additional, Regan, P.H., additional, Carpenter, M., additional, Zhu, S., additional, Ayangeakaa, A.D., additional, Anderson, J.T., additional, Berry, T., additional, Bottoni, S., additional, Burrows, I., additional, Carroll, R., additional, Copp, P., additional, Cullen, D., additional, Daniel, T., additional, Fraile, L., additional, Carmona Gallardo, M., additional, Grant, A., additional, Greene, J.P., additional, Guegi, L.A., additional, Hartley, D., additional, Ilieva, R., additional, Ilieva, S., additional, Janssens, R.V.F., additional, Kondev, F.G., additional, Kröll, T., additional, Lane, G.J., additional, Lauritsen, T., additional, Lazarus, I., additional, Lotay, G., additional, Fernandez Martinez, G., additional, Pucknell, V., additional, Reed, M., additional, Rohrer, J., additional, Sethi, J., additional, Seweryniak, D., additional, Shand, C.M., additional, Simpson, J., additional, Smolen, M., additional, Stefanova, E., additional, Vedia, V., additional, and Yordanov, O., additional

Published
2017
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38. Isotopic yields of spallation residues produced in $^{136}$Xe-induced reactions on deuterium at 500A MeV

Author

Alcántara-Núñez, J.A., Benlliure, J., Paradela, C., Pérez-Loureiro, C., Rodríguez-Sánchez, J. L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., Farget, F., Fernández-Ordóñez, M., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Ricciardi, M. V., Stéphan, C., Schmidt, K.-H., Schmitt, C., Tassan-Got, L., Villagrasa, C., Volant, C., Yordanov, O., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.40.Sc, 24.10.Lx, 25.70.−z, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
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39. Isotopic yields of spallation residues produced in $^{136}$Xe-induced reactions on deuterium at 500 A MeV

Author

Alcántara-Núñez, J., Benlliure, J., Fernández-Ordóñez, M., Heinz, A., Henzl, V., Henzlova, D., Kelić-Heil, A., Lafriaskh, A., Leray, S., Napolitani, P., Pereira, J., Ricciardi, M. V., Paradela, C., Stéphan, C., Schmidt, K.-H., Schmitt, C., Tassan-Got, L., Villagrasa, C., Volant, C., Yordanov, O., Pérez-Loureiro, C., Rodríguez-Sánchez, J. L., Audouin, L., Boudard, A., Casarejos, E., Enqvist, T., and Farget, F.

Subjects
ddc:530
Published
2015
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40. Isotopic yields of spallation residues produced inXe136-induced reactions on deuterium at500AMeV

Author

Alcántara-Núñez, J., primary, Benlliure, J., additional, Paradela, C., additional, Pérez-Loureiro, C., additional, Rodríguez-Sánchez, J. L., additional, Audouin, L., additional, Boudard, A., additional, Casarejos, E., additional, Enqvist, T., additional, Farget, F., additional, Fernández-Ordóñez, M., additional, Heinz, A., additional, Henzl, V., additional, Henzlova, D., additional, Kelić-Heil, A., additional, Lafriaskh, A., additional, Leray, S., additional, Napolitani, P., additional, Pereira, J., additional, Ricciardi, M. V., additional, Stéphan, C., additional, Schmidt, K.-H., additional, Schmitt, C., additional, Tassan-Got, L., additional, Villagrasa, C., additional, Volant, C., additional, and Yordanov, O., additional

Published
2015
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41. Production and $\beta$ half-lives of heavy neutron-rich nuclei approaching the r-process path at N=126

Author

Benlliure, J., Alvarez-Pol, H., Kurtukian Nieto, T., Morales, A.I., Casarejos, E., Cortina-Gil, D., Pereira, J., Becker, F., Borzov, I., Enqvist, T., Henzlova, D., Langanke, K., Martínez-Pinedo, G., Schmidt, K.H., Yordanov, O., Blank, Bertram, Giovinazzo, J., Jurado, B., Audouin, L., Napolitani, P., Fernandez, B., Rejmund, F., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-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), Université Sciences et Technologies - Bordeaux 1-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)-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
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Abstract

International audience; Fragmentation reactions of relativistic 238U and 208 Pb projectiles have been used to investigatethe production of heavy neutron-rich nuclei approaching the r-process waiting point at A≈195.The relativistic energies, together with the use of a high resolving-power magnetic spectrometerwere key conditions for the unambiguous identification of nuclei in the region of interest. Usingthis technique we were able to identify 73 new heavy neutron-rich nuclei expanding considerablythe north-west frontier of the chart of nuclide. Moreover, we were able to determine the halflives of 13 of those nuclide. The measured values are signific antly shorter than the predictionsused for r-process model calculations. The confirmation of these results for r-process nuclei atA≈195 would indicate that the r-process at this point is faster than expected, leading to a largerproduction of the heaviest nuclei.

Published
2010

42. Production of new neutron rich isotopes of heavy elements in fragmentation reactions of 238U projectiles at 1 AGeV

Author

Alvarez Pol, H., Benlliure, J., Audouin, L., Casarejos, E., Cortina Gil, D., Enqvist, T., Fernandez Dominguez, B., Junghans, A. R., Jurado, B., Napolitani, P., Pereira, J., Rejmund, F., Schmidt, K. H., and Yordanov, O.

Abstract

The production of heavy neutron-rich nuclei has been investigated using cold-fragmentation reactions of U 238 projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer Fragment Separator at GSI made it possible to identify 40 new heavy neutron-rich nuclei: Pt 205 , Au 207−210 , Hg 211−216 , Tl 214−217 , Pb 215−220 , Bi 219−224 , Po 223−227 , At 225−229 , Rn 230,231 , and Fr 233 . The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.

Published
2010

43. Coexisting structures in 105Ru

Author

Lalkovski, S., Ivanova, D., Stefanova, E.A., Korichi, A., Petkov, P., Kownacki, J., Kutsarova, T., Minkova, A., Bazzacco, D., Bergstrøm, M., Görgen, A, Herskind, Bent, Hübel, H., Yordanov, O., Lalkovski, S., Ivanova, D., Stefanova, E.A., Korichi, A., Petkov, P., Kownacki, J., Kutsarova, T., Minkova, A., Bazzacco, D., Bergstrøm, M., Görgen, A, Herskind, Bent, Hübel, H., and Yordanov, O.

Published
2014

44. First access to $\beta$ half-lives approaching the r-process path near N=126

Author

Kurtukian Nieto, T., Benlliure, J., Audouin, L., Becker, F., Blank, Bertram, Borzov, I.N., Casarejos, E., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Langanke, K., Martinez-Pinedo, G., Pereira, J., Rejmund, F., Schmidt, K.-H., Yordanov, O., 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut für Kernphysik [Darmstadt], Technische Universität Darmstadt (TU Darmstadt), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), and 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)

Subjects
25.70.Mn, 27.80.+w, 23.40.-s, 21.10.Tg, 26.30.+k, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Heavy neutron-rich nuclei close to N=126 were produced by fragmentation of a 1 A GeV 208Pb beam at the FRS at GSI. The beta-decay half-lives of 8 nuclides have been determined. The comparison of the data with model calculations including an approach based on the self-consistent ground-state description and continuum QRPA considering the Gamow-Teller and first-forbidden decays provide a first indication on the importance of first-forbidden transitions around A=195. The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei is faster than previously expected., 4 pages, 4 figures

Published
2008

45. New analysis method to determine $\beta$ decay half-lives: a first step towards the study of heavy neutron-rich nuclei approaching the r-process path near N=126

Author

Kurtukian Nieto, T., Audouin, L., Becker, F., Benlliure, J., Blank, Bertram, Borzov, I.N, Casarejos, E., Fernandez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Langanke, K., Martinez-Pinedo, G., Pereira, J., Rejmund, F., Schmidt, K.-H., Yordanov, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-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), Université Sciences et Technologies - Bordeaux 1-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)-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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2008

46. Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1A GeV

Author

Henzlova, D., Schmidt, K. H., Ricciardi, M. V., Kelic, A., Henzl, V., Napolitani, P., Audouin, L., Benlliure, J., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Junghans, A. R., Jurado, B., Krasa, A., Kurtukian, T., Leray, S., Ordonez, M. F., Pereira, J., Pleskac, R., Rejmund, F., Schmitt, C., Stephan, C., Tassan-Got, L., Villagrasa, C., Volant, C., Wagner, A., and Yordanov, O.

Subjects
cross section residue high-resolution magnetic spectrometer fragment separator FRS GSI, Nuclear Experiment
Abstract

The nuclide cross sections and longitudinal velocity distributions of residues produced in the reactions of 136Xe and 124Xe at 1A GeV in a lead target were measured at the high-resolution magnetic spectrometer, the fragment separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z=3 and Z=56 for 136Xe and between Z=5 and Z=55 for 124Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A=20, while more complex behavior is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range.

Published
2008

47. Coincidence measurement of residues and light particles in the reaction $^{56}Fe+p$ at 1 GeV per nucleon with SPALADIN

Author

Le Gentil, E., Aumann, T., Bacri, C. O., Benlliure, J., Bianchin, S., Böhmer, M., Boudard, A., Brzychczyk, J., Casarejos, E., Combet, M., Donadille, L., Ducret, J. E., Fernandez-Ordoñez, M., Gernhäuser, R., Johansson, H., Kezzar, K., Kurtukian Nieto, T., Lafriakh, A., Lavaud, F., Fèvre, A. Le, Leray, S., Lühning, J., Lukasik, J., Lynen, U., Müller, W. F., Pawlowski, P., Piétri, S., Rejmund, F., Schwarz, C., Sfienti, C., Simon, H., Trautmann, W., Volant, C., Yordanov, O., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
25.40.Sc, 24.10.-i, 25.70.Pq, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The spallation of $^{56}$Fe in collisions with hydrogen at 1 A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross-section into the different possible de-excitation channels. Detailed information on the evolution of these de-excitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several de-excitation models coupled to the INCL4 intra-nuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data., Comment: 4 pages, 5 figures, revised version accepted in Phys. Rev. Lett

Published
2008
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48. Production of medium-mass neutron-rich nuclei in reactions induced by $^{136}$Xe projectiles at 1 A GeV on a beryllium target

Author

Benlliure, J., Fernandez-Ordonez, M., Audouin, L., Boudard, A., Casarejos, E., Ducret, J. E., Enqvist, T., Heinz, A., Henzlova, D., Henzl, V., Kelic, A., Leray, S., Napolitani, P., Pereira, J., Rejmund, F., Ricciardi, M. V., Schmidt, K. -H., Schmitt, C., Stephan, C., Tassan-Got, L., Volant, C., Villagrasa, C., Yordanov, O., 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Production cross sections of medium-mass neutron-rich nuclei obtained in the fragmentation of 136Xe projectiles at 1 A GeV have been measured with the FRagment Separator (FRS) at GSI. 125Pd was identified for the first time. The measured cross sections are compared to 238U fission yields and model calculations in order to determine the optimum reaction mechanism to extend the limits of the chart of the nuclides around the r-process waiting point at N=82., 9 pages, 6 figures

Published
2008
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49. New technique to determine beta half-lives in complex-background

Author

Kurtukian Nieto, T., Benlliure, J., Schmidt, K.-H., Audoin, L., Becker, F., Blank, Bertram, Casarejos, E., Cortina-Gil, D., Fernandez-Ordonez, M., Giovinazzo, J., Henzlova, D., Jurado, B., Pereira, J., Rejmund, F., Yordanov, O., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidade de Santiago de Compostela [Spain] (USC ), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Commune avec ACEN; International audience

Published
2007
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50. Spallation Residues in the Reaction $^{56}$Fe + p at 0.3, 0.5, 0.75, 1.0 and 1.5 A GeV

Author

Villagrasa-Canton, C., Boudard, A., Ducret, J. -E., Fernandez, B., Leray, S., Volant, C., Armbruster, P., Enqvist, T., Hammache, F., Helariutta, K., Jurado, B., Ricciardi, M. -V., Schmidt, K. -H., Summerer, K., Vives, F., Yordanov, O., Audouin, L., Bacri, C. -O., Ferrant, L., Napolitani, P., Rejmund, F., Stephan, C., Tassan-Got, L., Benlliure, J., Casarejos, E., Fernandez-Ordonez, M., Pereira, J., Czajkowski, S., Karamanis, D., Pravikoff, M., George, J. S., Mewaldt, R. A., Yanasak, N., Wiedenbeck, M., Connell, J. J., Faestermann, T., Heinz, A., Junghans, A., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-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), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The spallation residues produced in the bombardment of 56}Fe at 1.5, 1.0, 0.75, 0.5 and 0.3 A GeV on a liquid-hydrogen target have been measured using the reverse kinematics technique and the Fragment Separator at GSI (Darmstadt). This technique has permitted the full identification in charge and mass of all isotopes produced with cross-sections larger than 10^{-2} mb down to Z=8. Their individual production cross-sections and recoil velocities at the five energies are presented. Production cross-sections are compared to previously existing data and to empirical parametric formulas, often used in cosmic-ray astrophysics. The experimental data are also extensively compared to different combinations of intra-nuclear cascade and de-excitation models. It is shown that the yields of the lightest isotopes cannot be accounted for by standard evaporation models. The GEMINI model, which includes an asymmetric fission decay mode, gives an overall good agreement with the data. These experimental data can be directly used for the estimation of composition modifications and damages in materials containing iron in spallation sources. They are also useful for improving high precision cosmic-ray measurements., Submited to Phys. Rev. C (10/2006)

Published
2007
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