Search

Your search keyword '"Thummerer, S."' showing total 164 results
Start Over Author "Thummerer, S."
164 results on '"Thummerer, S."'

1. Clusters in Light Nuclei

Author

Beck, C., Papka, P., Zafra, A. Sanchez i, Thummerer, S., Azaiez, F., Bednarczyk, P., Courtin, S., Curien, D., Dorvaux, O., Goasduff, A., Lebhertz, D., Nourreddine, A., Rousseau, M., Salsac, M. -D., von Oertzen, W., Gebauer, B., Wheldon, C., Kokalova, Tz., Efimov, G., Zherebchevsky, V., Schulz, Ch., Bohlen, H. G., Kamanin, D., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D. R., Szilner, S., Milin, M., Catford, W. N., Jenkins, D. G., and Royer, G.

Subjects
Nuclear Experiment
Abstract

A great deal of research work has been undertaken in the alpha-clustering study since the pioneering discovery, half a century ago, of 12C+12C molecular resonances. Our knowledge of the field of the physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. In this work, the occurence of "exotic" shapes in light N=Z alpha-like nuclei is investigated. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Results on clustering aspects are also discussed for light neutron-rich Oxygen isotopes., Comment: 12 pages, 5 figures. Invited Talk presented by C. Beck at the Zakopane Conference on Nuclear Physics "Extremes of the Nuclear Landscape" XLV in the series of Zakopane Schools of Physics - International Symposium - Zakopane, Poland, August 30 - September 5, 2010.To be publihed in Acta Physica Polonica B42 no 3, March 2011

Published
2010
Full Text
View/download PDF

2. Binary reaction decays from 24Mg+12C

Author

Beck, C., Papka, P., Zafra, A. Sanchez i, Thummerer, S., Azaiez, F., Bednarczyk, P., Courtin, S., Curien, D., Dorvaux, O., Lebhertz, D., Nourreddine, A., Rousseau, M., von Oertzen, W., Gebauer, B., Wheldon, C., Kokalova, Tz., de Angelis, G., Gadea, A., Lenzi, S., Szilner, S., Napoli, D. R, Catford, W. N., Jenkins, D. G., and Royer, G.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Charged particle and gamma decays in 24Mg* are investigated for excitation energies where quasimolecular resonances appear in 12C+12C collisions. Various theoretical predictions for the occurence of superdeformed and hyperdeformed bands associated with resonance structures with low spin are discussed within the measured 24Mg* excitation energy region. The inverse kinematics reaction 24Mg+12C is studied at E_lab(24Mg) = 130 MeV, an energy which enables the population of 24Mg states decaying into 12C+12C resonant break-up states. Exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated gamma decays studied. Coincident events associated with inelastic and alpha-transfer channels have been selected by choosing the excitation energy or the entry point via the two-body Q-values. The analysis of the binary reaction channels is presented with a particular emphasis on 24Mg-gamma, 20Ne-gamma and 16O-gamma coincidences. New information (spin and branching ratios) is deduced on high-energy states in 24Mg and 16O, respectively., Comment: 27 pages, 8 figures, 1 table

Published
2009
Full Text
View/download PDF

3. Reaction mechanisms in 24Mg+12C and 32S+24Mg

Author

Beck, C., Zafra, A. Sanchez i, Papka, P., Thummerer, S., Azaiez, F., Courtin, S., Curien, D., Dorvaux, O., Lebhertz, D., Nourreddine, A., Rousseau, M., von Oertzen, W., Gebauer, B., Kokalova, Tz., Wheldon, C., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D. R., Szilner, S., Catford, W. n., Jenkins, D. G., and Royer, G.

Subjects
Nuclear Experiment
Abstract

The occurence of "exotic" shapes in light N=Z alpha-like nuclei is investigated for 24Mg+12C and 32S+24Mg. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures with low spin are presented. For both reactions, exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility of Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated $\gamma$-decays studied. The analysis of the binary and ternary reaction channels is discussed., Comment: 7 pages, 4 figures, Paper presented at the Fusion08 International Conference on New Aspects of Heavy Ion Collisions Near the Coulomb Barrier, Chicago. Proceedings to be published by AIP Conference Proceedings Illinois, USA, September 22-26, 2008

Published
2008
Full Text
View/download PDF

4. Fission decay of N = Z nuclei at high angular momentum: $^{60}$Zn

Author

Von Oertzen, W., Zherebchevsky, V., Gebauer, B., Schulz, C., Thummerer, S., Kamanin, D., Royer, G., and Wilpert, T.

Subjects
Nuclear Experiment
Abstract

Using a unique two-arm detector system for heavy ions (the BRS, binary reaction spectrometer) coincident fission events have been measured from the decay of $^{60}$Zn compound nuclei formed at 88MeV excitation energy in the reactions with $^{36}$Ar beams on a $^{24}$Mg target at $E_{lab}(^{36}$Ar) = 195 MeV. The detectors consisted of two large area position sensitive (x,y) gas telescopes with Bragg-ionization chambers. From the binary coincidences in the two detectors inclusive and exclusive cross sections for fission channels with differing losses of charge were obtained. Narrow out-of-plane correlations corresponding to coplanar decay are observed for two fragments emitted in binary events, and in the data for ternary decay with missing charges from 4 up to 8. After subtraction of broad components these narrow correlations are interpreted as a ternary fission process at high angular momentum through an elongated shape. The lighter mass in the neck region consists dominantly of two or three-particles. Differential cross sections for the different mass splits for binary and ternary fission are presented. The relative yields of the binary and ternary events are explained using the statistical model based on the extended Hauser-Feshbach formalism for compound nucleus decay. The ternary fission process can be described by the decay of hyper-deformed states with angular momentum around 45-52 $hbar$., Comment: 23 pages, 25 figures

Published
2008
Full Text
View/download PDF

5. Study of Deformation Effects in the Charged Particle Emission from 46Ti

Author

Brekiesz, M., Papka, P., Maj, A., Kmiecik, M., Beck, C., Bednarczyk, P., Grebosz, J., Haas, F., Meczynski, W., Rauch, V., Rousseau, M., Zafra, A. Sanchez i, Styczen, J., Thummerer, S., Zieblinski, M., and Zuber, K.

Subjects
Nuclear Experiment
Abstract

The 46Ti compound nucleus, as populated by the fusion-evaporation reaction 27Al + 19F at the bombarding energy of 144 MeV, has been investigated by charged particle spectroscopy using the multidetector array ICARE at the VIVITRON tandem facility of the IReS (Strasbourg). The light charged particles have been measured in coincidence with evaporation residues. The CACARIZO code, a Monte Carlo implementation of the statistical-model code CASCADE, has been used to calculate the spectral shapes of evaporated alpha-particles which are compared with the experimental spectra. This comparison indicates the possible signature of large deformations of the compound nucleus., Comment: 6 pages, 4 figures, Proceedings od the Zakopane 20004 Symposium, to be published in Acta Phys. Pol. B36 (2005)

Published
2004

6. Search for 12C+12C molecule in 24Mg* populated by 24Mg+12C

Author

Beck, C., Zafra, A. Sanchez i, Haas, F., Papka, P., Rauch, V., Rousseau, M., Azaiez, F., Bednarczyk, P., Curien, D., Dorvaux, O., Nourreddine, A., Robin, J., von Oertzen, W., Gebauer, B., Kokalova, T., Thummerer, S., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D. R., Szilner, S., Catford, W. N., and Jenkins, D.

Subjects
Nuclear Experiment
Abstract

The gamma-decay properties of 24Mg excited states are investigated in the inverse reaction 24Mg+12C at E(24Mg) = 130 MeV. At this energy the direct inelastic scattering populates a 24Mg* energy region where 12C+12C breakup resonances can occur. Very exclusive data were collected with the Binary Reaction Spectrometer (BRS) in coincidence with EUROBALL installed at the VIVITRON Tandem facility of the IReS at Strasbourg. The experimental detection system is decribed and preliminary results of binary reaction coincid data are presented., Comment: 4 pages, 2 figures included; paper presented at the Nucleus-Nucleus Conference, Moscow, June 2003, and submitted to Nucl. Phys. A

Published
2003
Full Text
View/download PDF

7. Large Deformation Effects in the N = Z 44Ti Compound Nucleus

Author

Papka, P., Beck, C., Haas, F., Rauch, V., Rousseau, M., Bednarczyk, P., Courtin, S., Dorvaux, O., Eddahbi, K., Kezzar, K., Piqueras, I., Robin, J., Zafra, A. Sanchez i, Thummerer, S., Redon, N., Rosse, B., Stezowski, O., Prevost, A., Hachem, A., Martin, E., and Wuosmaa, A. H.

Subjects
Nuclear Experiment
Abstract

The N = Z 44Ti* nucleus has been populated in Fusion Evaporation process at very high excitation energies and angular momenta using two entrance channels with different mass-asymmetry. The deformation effects in the rapidly rotating nuclei have been investigated through the energy distribution of the alpha-particle combined to statistical-model calculations. In the case of low-multiplicity events, the ratio between first particle emitted has been measured and shows significant disagreement with the predictions of the statistical-model. This may explain The large discrepancies observed in proton energy spectra measured in previous experiments performed in the same mass region., Comment: Proceeding of the 10th International Conference on Nuclear Reaction Mechanisms, Varenna Italy, June 9-13 2003. 10 pages, 6 figures, 1 table

Published
2003

8. The population of deformed bands in $^{48}$Cr by emission of $^{8}$Be from the $^{32}$S + $^{24}$Mg reaction

Author

Thummerer, S., von Oertzen, W., Gebauer, B., Lenzi, S. M., Gadea, A., Napoli, D. R., Beck, C., and Rousseau, M.

Subjects
Nuclear Experiment
Abstract

Using particle-$\gamma$ coincidences we have studied the population of final states after the emission of 2 $\alpha$-particles and of $^{8}$Be in nuclei formed in $^{32}$S+$^{24}$Mg reactions at an energy of $\textrm{E}_{\rm L}(^{32}\textrm{S}) = 130 {\rm MeV}$. The data were obtained in a setup consisting of the GASP $\gamma$-ray detection array and the multidetector array ISIS. Particle identification is obtained from the $\Delta$E and E signals of the ISIS silicon detector telescopes, the $^{8}$Be being identified by the instantaneous pile up of the $\Delta$E and E pulses. $\gamma$-ray decays of the $^{48}$Cr nucleus are identified with coincidences set on 2 $\alpha$-particles and on $^{8}$Be. Some transitions of the side-band with $K^\pi=4^{-}$ show stronger population for $^{8}$Be emission relative to that of 2 $\alpha$-particles (by a factor $1.5-1.8$). This observation is interpreted as due to an enhanced emission of $^{8}$Be into a more deformed nucleus. Calculations based on the extended Hauser-Feshbach compound decay formalism confirm this observation quantitatively., Comment: 17 pages, 9 figures accepted for publication in J. Phys. G

Published
2001
Full Text
View/download PDF

12. Octupole-deformed molecular bands in 21Ne

Author

Wheldon, C., Kokalova, Tz., von Oertzen, W., Thummerer, S., Bohlen, H. G., Gebauer, B., Tumino, A., Massey, T. N., de Angelis, G., Axiotis, M., Gadea, A., Kröll, Th., Mărginean, N., Napoli, D. R., De Poli, M., Ur, C., Bazzacco, D., Lenzi, S. M., Rossi Alvarez, C., Lunardi, S., Menegazzo, R., Bizzeti, P. G., and Bizzeti-Sona, A. M.

Published
2005
Full Text
View/download PDF

14. Spectroscopy of Ne and Na isotopes: Preliminary results from a EUROBALL + Binary Reaction Spectrometer experiment

Author

Keyes, K. L., Papenberg, A., Chapman, R., Ollier, J., Liang, X., Burns, M. J., Labiche, M., Spohr, K. -M., Amzal, N., Beck, C., Bednarczyk, P., Haas, F., Duchêne, G., Papka, P., Gebauer, B., Kokalova, T., Thummerer, S., von Oertzen, W., Wheldon, C., Gross, Carl J., editor, Nazarewicz, Witold, editor, and Rykaczewski, Krzysztof P., editor

Published
2005
Full Text
View/download PDF

16. Spectroscopy of 40Ca and negative-parity bands

Author

Torilov, S., Thummerer, S., Oertzen, W. von, Kokalova, Tz, Angelis, G. de, Bohlen, H. G., Tumino, A., Axiotis, M., Farnea, E., Marginean, N., Martinez, T., Napoli, D. R., Poli, M. De, Lenzi, S. M., Ur, C., Rousseau, M., and Papka, P.

Published
2004
Full Text
View/download PDF

17. A study of γ decays and octupole bands in 21Ne and 21Na

Author

Thummerer, S., von Oertzen, W., Kokalova, Tz., Bohlen, H. G., Gebauer, B., Tumino, A., Massey, T. N., de Angelis, G., Axiotis, M., Gadea, A., Kröll, Th., Marginean, N., Napoli, D. R., De Poli, M., Ur, C., Bazzacco, D., Lenzi, S. M., Rossi Alvarez, C., Lunardi, S., Menegazzo, R., Bizzeti, P. G., and Bizzeti-Sona, A. M.

Published
2003
Full Text
View/download PDF

20. Search for cluster emission and extremely deformed shapes using charged-particle spectroscopy

Author

Beck, C., Rousseau, M., Papka, P., Sànchez i Zafra, A., Bhattacharya, C., Rauch, V., Bednarczyk, P., Courtin, S., Dorvaux, O., Haas, F., Nourreddine, A., Piqueras, I., Robin, J., El Bakali, L., Enaux, C., Galmar, E., Szilner, S., Stezowski, O., Prévost, A., Thummerer, S., von Oertzen, W., Hachem, A., Martin, E., Fahli, A., Morsad, A., Szanto de Toledo, A., and Sanders, S. J.

Published
2003
Full Text
View/download PDF

29. Search for 12C+ 12C molecule in 24Mg * populated by 24Mg+ 12C

Author

Beck, C., Sa`nchez i Zafra, A., Haas, F., Papka, P., Rauch, V., Rousseau, M., Azaiez, F., Bednarczyk, P., Curien, D., Dorvaux, O., Nourreddine, A., Robin, J., von Oertzen, W., Gebauer, B., Kokalova, Ts., Thummerer, S., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D.R., Szilner, S., Catford, W.N., and Jenkins, D.

Published
2004
Full Text
View/download PDF

31. High-spin states and band terminations in 49V

Author

Rodrigues Ferreira Maltez, Dario Pablo, Hojman, Daniel Leonardo, Lenzi, Silvia M., Cardona, Maria Angelica, Fernea, Enrico, Axiotis, M., Beck, C., Bednarczyk, P., Bizzetti, P. G., Bizzetti Sona, A. M., Della Vedova, F., Grebosz, J., Haas, F., Kmiecik, M., Maj, A., Męczyński, W., Napoli, D. R., Nespolo, M., Papka, P., Sánchez i Zafra, A., Styczen, J., Thummerer, S., and Ziębliński, M.

Subjects
purl.org/becyt/ford/1 [https], NUCLEAR STRUCTURE, Ciencias Físicas, MULTIDETECTOR ARRAY-EUROBALL, SHELL MODEL, Física Nuclear, BAND TERMINATION, purl.org/becyt/ford/1.3 [https], CIENCIAS NATURALES Y EXACTAS
Abstract

High-spin states in 49 V have been studied through the 28 Si(28 Si, α3p) reaction using the EUROBALL γ-ray detector array. The 49 V level scheme has been extended up to 13.1 MeV including 21 new states. Both negative and positive parity states have been interpreted in the framework of theShell Model. The 27/2− and the 31/2+ band termination states have been observed in agreement with theoretical predictions. Fil: Rodrigues Ferreira Maltez, Dario Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia Física (Centro Atómico Constituyentes). Proyecto Tandar; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina Fil: Hojman, Daniel Leonardo. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia Física (Centro Atómico Constituyentes). Proyecto Tandar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Lenzi, Silvia M.. Istituto Nazionale Di Fisica Nucleare.; Italia. Università di Padova; Italia Fil: Cardona, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia Física (Centro Atómico Constituyentes). Proyecto Tandar; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina Fil: Fernea, Enrico. Università di Padova; Italia. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Axiotis, M.. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Beck, C.. Université de Strasbourg; Francia. Centre National de la Recherche Scientifique; Francia Fil: Bednarczyk, P.. Polish Academy of Sciences; Argentina Fil: Bizzetti, P. G.. Università di Padova; Italia. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Bizzetti Sona, A. M.. Università di Padova; Italia. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Della Vedova, F.. Università di Padova; Italia. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Grebosz, J.. Polish Academy of Sciences; Argentina Fil: Haas, F.. Université de Strasbourg; Francia. Centre National de la Recherche Scientifique; Francia Fil: Kmiecik, M.. Polish Academy of Sciences; Argentina Fil: Maj, A.. Polish Academy of Sciences; Argentina Fil: Męczyński, W.. Polish Academy of Sciences; Argentina Fil: Napoli, D. R.. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Nespolo, M.. Università di Padova; Italia. Istituto Nazionale Di Fisica Nucleare.; Italia Fil: Papka, P.. Université de Strasbourg; Francia. Centre National de la Recherche Scientifique; Francia Fil: Sánchez i Zafra, A.. Université de Strasbourg; Francia. Centre National de la Recherche Scientifique; Francia Fil: Styczen, J.. Polish Academy of Sciences; Argentina Fil: Thummerer, S.. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung; Alemania Fil: Ziębliński, M.. Polish Academy of Sciences; Argentina

Published
2015

32. High-spin states and band terminations in v 49

Author

Rodrigues, D., Hojman, D., Lenzi, SILVIA MONICA, Cardona, M. A., Farnea, E., Axiotis, M., Beck, C., Bednarczyk, P., Bizzetti, P. G., Bizzetti Sona, A. M., DELLA VEDOVA, Francesca, Grębosz, J., Haas, F., Kmiecik, M., Maj, A., Męczyński, W., Napoli, D. R., Nespolo, Massimo, Papka, P., Zafra, A. Sánchez I, Styczen, J., Thummerer, S., and Ziębliński, M.

Subjects
Nuclear and High Energy Physics
Published
2015

33. Clusters in Light Nuclei

Author

Beck, C., Papka, P., Zafra, A. Sanchez i, Thummerer, S., Azaiez, F., Bednarczyk, P., Courtin, S., Curien, D., Dorvaux, O., Goasduff, A., Lebhertz, D., Nourreddine, A., Rousseau, M., Salsac, M. -D., von Oertzen, W., Gebauer, B., Wheldon, C., Kokalova, Tz., Efimov, G., Zherebchevsky, V., Schulz, Ch., Bohlen, H. G., Kamanin, D., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D. R., Szilner, S., Milin, M., Catford, W. N., Jenkins, D. G., Royer, G., 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), 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), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, clusters, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, 25.70.Jj, 25.70.Pq, 24.60.Dr, 21.10, 27.30, 24.60.Dr
Abstract

A great deal of research work has been undertaken in the alpha-clustering study since the pioneering discovery, half a century ago, of 12C+12C molecular resonances. Our knowledge of the field of the physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. In this work, the occurence of "exotic" shapes in light N=Z alpha-like nuclei is investigated. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Results on clustering aspects are also discussed for light neutron-rich Oxygen isotopes., Comment: 12 pages, 5 figures. Invited Talk presented by C. Beck at the Zakopane Conference on Nuclear Physics "Extremes of the Nuclear Landscape" XLV in the series of Zakopane Schools of Physics - International Symposium - Zakopane, Poland, August 30 - September 5, 2010.To be publihed in Acta Physica Polonica B42 no 3, March 2011

Published
2011

34. High-spin states and band terminations inV49

Author

Rodrigues, D., primary, Hojman, D., additional, Lenzi, S. M., additional, Cardona, M. A., additional, Farnea, E., additional, Axiotis, M., additional, Beck, C., additional, Bednarczyk, P., additional, Bizzetti, P. G., additional, Bizzetti-Sona, A. M., additional, Della Vedova, F., additional, Grębosz, J., additional, Haas, F., additional, Kmiecik, M., additional, Maj, A., additional, Męczyński, W., additional, Napoli, D. R., additional, Nespolo, M., additional, Papka, P., additional, Zafra, A. Sánchez i, additional, Styczen, J., additional, Thummerer, S., additional, and Ziębliński, M., additional

Published
2015
Full Text
View/download PDF

35. States in 17O excited in the 13C + 9Be -> 13C + 2a + n reaction at 90 MeV

Author

Milin, Matko, Ostashko, V. V., Miljanić, Đuro, Bohlen, H. G., Di Pietro, A., Goryunov, O. Yu., Kokalova, Tz., Lattuada, M., Musumarra, A., von Oertzen, W., Pellegriti, M. G., Romano, S., Thummerer, S., Tumino, A., and Zadro, Mile

Subjects
heavy ion, 17O, cluster states
Abstract

The 13C+9Be reactions have been measured using a 13C beam with an incident energy of 90 MeV. The 17O excitation energy spectra have been reconstructed from the detected 13C coincidences. A number of the 17O states has been observed and their structure has been discussed in relation to the well-known 16O cluster states.

Published
2009

37. Binary reaction decays from Mg-24+C-12

Author

Beck, C, Papka, P, Sanchez i Zafra, A, Thummerer, S, Azaiez, F, Bednarczyk, P, Courtin, S, Curien, D, Dorvaux, O, Lebhertz, D, Nourreddine, A, Rousseau, M, von Oertzen, W, Gebauer, B, Wheldon, C, Kokalova, T, de Angelis, G, Gadea, A, Lenzi, S, Szilner, S, Napoli, DR, Catford, WN, Jenkins, DG, and Royer, G

Published
2009

38. Reaction mechanisms in 24Mg+12C and 32S+24Mg

Author

Beck, C., S&#224, nchez i Zafra, A., Papka, P., Thummerer, S., Azaiez, F., Courtin, S., Curien, D., Dorvaux, O., Lebhertz, D., Nourreddine, A., Rousseau, M., von Oertzen, W., Gebauer, B., Kokalova, Tz., Wheldon, C., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D.R., Szilner, S., Catford, W.N., Jenkins, D.G., Royerf, G., and Rehm, K. Ernst Back, Birger B. Esbensen, Henning Lister, C.J.

Subjects
light nuclei, deformation, quasimolecular structures
Abstract

The occurence of “ exotic” shapes in light N = Z -like nuclei is investigated for 24Mg+12C and 32S+24Mg. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures with low spin are presented. For both reactions, exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility of Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated -decays studied. The analysis of the binary and ternary reaction channels is discussed.

Published
2009

39. Coplanar Ternary Cluster Decay of Hyper-deformed $^{56}$Ni

Author

Efimov, G., Zherebchevsky, V., Von Oertzen, W., Gebauer, B., Thummerer, S., Kokalova, Tz., Schulz, Ch., Bohlen, H.G., Kamanin, D., Beck, C., Curien, D., Rousseau, Marc, Papka, P., Royer, Guy, De Angelis, G., Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
NUCLEAR REACTIONS, binary and ternary fission channels, Kinematic coincidences for heavy fragments, 24Mg+32S, 25.70Jj, 25.70.Pq, 24.60.Dr, Elab=163.5 MeV, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, out-of-plane correlations
Abstract

Coincidences between two heavy fragments have been measured from fission of 56Ni compound nuclei, formed in the 32S + 24Mg reaction at Elab(32S) = 163.5 MeV. A unique experimental set-up consisting of two large area position sensitive (x, y) gas-detector telescopes has been used allowing the complete determination of the observed fragments, and their momentum vectors. In addition to binary fission events with subsequent particle evaporation, narrow out-of-plane correlations are observed for two fragments emitted in purely binary events and in events with a missing mass consisting of 2$\alpha$ and 3$\alpha$ particles(12C). These events are interpreted as ternary cluster decay from 56Ni-nuclei at high angular momenta through hyper-deformed shapes

Published
2007

40. Study of binary reaction channels in the $^{24}$Mg + $^{12}$C collision

Author

Zafra, A. Sanchez I., Beck, C., Haas, F., Papka, P., Rauch, V., Marc Rousseau, Azaiez, F., Bednarczyk, P., Sandrine Courtin, Curien, D., Dorvaux, O., Nourreddine, A., Robin, J., Salsac, M. D., Oertzen, W., Kokalova, T., Thummerer, S., Wheldon, C., Angelis, G., Gadea, A., Lenzi, S., Napoli, D. R., Szilner, S., Catford, W. N., Jenkins, D., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), EUROBALL, and Heyd, Yvette

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

The study of $\gamma$-decays in $^{24}$Mg$^{*}$ is presented for excitation energies between the $\alpha$+$^{20}$Ne (9.3 MeV) and $^{12}$C+$^{12}$C (13.9 MeV) thresholds, where molecular resonances have been observed in $^{12}$C+$^{12}$C collisions. Various theoretical predictions exist for the occurence of superdeformed and hyperdeformed bands which can partially be identified with known resonance structures correlated in several reaction channels, and for which low spin members are predicted within the measured $^{24}$Mg$^{*}$ excitation energy region. The inverse kinematics reaction $^{24}$Mg$+^{12}$C has been investigated at E$_{lab}$($^{24}$Mg) = 130 MeV, an energy which enable the population of $^{24}$Mg states decaying into $^{12}$C+$^{12}$C resonant breakup states. Exclusive data were collected with the Binary Reaction Spetrometer (BRS) in coincidence with EUROBALL installed at the VIVITRON Tandem facility of the IReS at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their $\gamma$-decays determined by using the BRS as a master trigger. Coincident events with inelastic as well as with binary $\alpha$-transfer channels have been selected by choosing the excitation energy or the entry point via the two-body Q-values. The analysis of the binary and quasi-binary reaction channels is presented with a particular emphasis on the $^{24}$Mg-$\gamma$ and $^{20}$Ne-$\gamma$ coincidences as well as the $^{12}$C-$^{12}$C coincidences.

Published
2005

41. Study of binary reaction channels in the 24Mg+12C collision

Author

Sánchez i Zafra, A, Beck, C, Hass, F, Papka, P, Rauch, V, Rousseau, M, Azaiez, F, Bednarczyk, P, Courtin, S, Curien, D, Dorvaux, O, Nourreddine, A, Robin, J, Salsac, M D, von Oertzen, W, Gebauer, B, Kokalova, T, Thummerer, S, Wheldon, C, De Angelid, G, Gadea, A, Lenzi, S, Napoli, D R, Szilner, S, Catford, W N, and Jenkins, D

Subjects
heavy ion reactions, extreme deformations, Nuclear Physics
Abstract

xx

Published
2005

42. Coplanar ternary decay of hyper-deformed ${56}Ni$

Author

Oertzen, W., Gebauer, B., Efimov, G., Thummerer, S., Kokalova, T., Kamanin, D., Schulz, C., Bohlen, H. G., Beck, C., Dominique Curien, Marc Rousseau, Papka, P., Guy Royer, Angelis, G., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, 25.70.Jj, 25.70.Pq, 24.60.Dr, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

Ternary fission events from the decay of $^{56}$Ni compound nuclei, formed in the $^{32}$S + $^{24}$Mg reaction at $E_{lab}(^{32}S)$ = 163.5 MeV, have been measured in a unique set-up consisting of two large area position sensitive (x,y) gas detector telescopes. Very narrow out-of-plane correlations are observed for two fragments emitted in either purely binary events or in events with a missing mass consisting of 2 and 3 $\alpha$-particles. These correlations are interpreted as ternary fission decay from compound nuclei at high angular momenta through an elongated (hyper-deformed) shape with very large moments of inertia, where the lighter mass in the neck region remains at rest.

Published
2005

43. Study of deformation effects in the charged particle emission from $^{46}$Ti

Author

Brekiesz, M., Papka, P., Maj, A., Kmiecik, M., Beck, C., Bednarczyk, P., Grebosz, J., Haas, F., Meczynski, W., Rauch, V., Rousseau, M., Zafra, A. Sanchez i, Styczen, J., Thummerer, S., Zieblinski, M., Zuber, K., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
25.70.Gh, 25.70.Jj, 25.70.mn, 24.60.Dr, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The 46Ti compound nucleus, as populated by the fusion-evaporation reaction 27Al + 19F at the bombarding energy of 144 MeV, has been investigated by charged particle spectroscopy using the multidetector array ICARE at the VIVITRON tandem facility of the IReS (Strasbourg). The light charged particles have been measured in coincidence with evaporation residues. The CACARIZO code, a Monte Carlo implementation of the statistical-model code CASCADE, has been used to calculate the spectral shapes of evaporated alpha-particles which are compared with the experimental spectra. This comparison indicates the possible signature of large deformations of the compound nucleus., Comment: 6 pages, 4 figures, Proceedings od the Zakopane 20004 Symposium, to be published in Acta Phys. Pol. B36 (2005)

Published
2004

44. Search for Cluster Structure of Excited States in 14C

Author

von Oertzen, W., Bohlen, H.G., Milin, Matko, Kokalova, Tz., Thummerer, S., Tumino, A., Kalpakchieva, R., Massey, T.N., Eisermann, Y., Graw, G., Faestermann, T., Hertenberger, R., and Wirth, H.-F.

Subjects
14C, cluster states, molceular states
Abstract

We have studied three different 2n-transfer reactions on a 12C target and the 5He-transfer in the reaction 9Be(7Li, d)14C. Combined with a systematic search through experimental results for transfer reactions, inelastic excitations and other data, we have established an almost complete spectroscopy for 14C up to 18 MeV excitation. We identify states with single-particle structure with oblate shapes, and states connected to proton excitations. We identify two bands connected to triangular (oblate) cluster states. Further we list states of prolate shape which have no simple structure related to the low lying oblate states of 12C. These are proposed to form a parity inversion doublet, to have strong alpha-clustering, and to form rotational bands of high moment of inertia. Thus it is possible for the first time to identify chain states expected in the isotope 14C.

Published
2004

45. Structure studies of the carbon isotopes 14, 15, 16, 17C

Author

Bohlen, H.G., von Oertzen, W., Kalpakchieva, R., Massey, T.N., de Angelis, G., Ogloblin, A.A., Gebauer, B., Milin, Matko, Kokalova, T., Schulz, Ch., and Thummerer, S.

Subjects
nuclear structure, nuclear reactions, Nuclear Theory, Nuclear Experiment
Abstract

We have measured for the isotopes 17C, 16C, 15C excited states up to about 17 MeV excitation energy using the three-neutron transfer reaction (12C, 9C) on 14C, 13C and 12C targets, respectively, at 231 MeV incident energy.

Published
2004

46. Search for ^12C+^12C molecule in Mg-24 populated by ^24Mg-^12C

Author

Beck, C., Zafra, A.S., Haas, F., Papka, P., Rauch, V., Rousseau, M., Azaiez, F., Bednarczyk, P., Curien, D., Dorvaux, O., Nourreddine, A., Robin, J., von Oertzen, W., Gebauer, B., Kokalova, T., Thummerer, S., de Angelis, G., Gadea, A., Lenzi, S., Napoli, D.R., Szilner, Suzana, Catford, W.N., and Jenkins, D.

Subjects
heavy-ion reactions, states, nuclei, resonances, Nuclear Experiment
Abstract

The gamma-decay properties of ^24Mg excited states are investigated in the inverse reaction ^24Mg+^12C at E_lab(^24Mg) = 130 MeV. At this energy the direct inelastic scattering populates a ^24*Mg energy region where ^12C+^12C breakup resonances can occur. Very exclusive data were collected with the Binary Reaction Spectrometer (BRS) in coincidence with EUROBALL installed at the VIVITRON Tandem facility of the IReS at Strasbourg. The experimental detection system is described and preliminary results of binary reaction coincidence data are presented.

Published
2004

47. Structure of neutron-rich Beryllium and Carbon isotopes

Author

Bohlen, HG., Oertzen, W. von, Kalpakchieva, R., Massey, TN., Grimes, SM., Kokalova, Tz., Lenske, H., Milin, Matko, Schulz, Ch., Thummerer, S., Kubono, S., Ozawa, A., and Ueno, H.

Subjects
Physics::Atomic Physics, Nuclear Experiment
Abstract

The neutron-rich Beryllium isotopes 10Be, 11Be and 12Be have been investigated with a number of transfer reactions . Each reaction is chosen to populate specific structures of these isotopes with distinct selectivity. In this way levels of single particle, particle-hole and molecular character can be distinguished and tentative spin-parity assignments could be made.

Published
2003

48. Search for the ^12C+^12C molecule in ^24Mg^* populated by the ^24Mg+^12C reaction

Author

Beck, C., Sanchez i Zafra, A., Papka, P., Haas, F., Rauch, V., Rousseau, M., Azaiez, F., Bednarczyk, P., Curien, D., Dorvaux, O., Nourredine, A., Robin, J., Gebauer, B., Kokalova, T., Thummerer, S., Oertzen, W. von, Angelis, G. de, Gadea, A., Lenzi, S., Napoli, D.R., Szilner, Suzana, Catford, W., and Jenkins, D.

Subjects
nuclear reactions
Published
2003

49. Structure studies of neutron-rich beryllium and carbon isotopes

Author

Bohlen, H.G., Kalpakchieva, R., Oertzen, W. von, Massey, T.N., Gebauer, B., Grimes, S.M., Kokalova, T., Lenz, A., Milin, Matko, Schulz, Ch., Thummerer, S., Torilov, S., Tumino, A., Jolos, Rostislav and Scheid, Werner, Jolos, Rastislav, and Scheid, Werner

Subjects
food and beverages, spectroscopy of 10, 11, 12Be and 16C, level schemes, QRPA calculations, clusters, Nuclear Experiment, spectroscopy of ^10, 12Be and ^16C, heavy-ion transfer reaction, QRPA calculation
Abstract

The structure of neutron-rich beryllium isotopes has been investigated using different heavy-ion induced transfer reactions. A strong sensitivity to the chosen core nucleus is found for the cores of 9Be and 10Be, respectively. With a 9Be core, molecular rotational bands up to high excitation energies are observed due to the pronounced 2alpha-cluster structure, whereas only few states at low excitation energies are populated with a 10Be core. For 11Be a detailed investigation has been performed for the three states at 3.41 MeV, 3.89 MeV and 3.96 MeV, which resulted in the most probable spin-parity assignments 3/2+, 5/2- and 3/2-, respectively. Furthermore we have studied particle-hole states of 16C using the 13C(12C, 9C)16C reaction and found 14 previously unknow states.

Published
2003

50. Spectroscopy of particle-hole states of 16C

Author

Bohlen, H.G., Kalpakchieva, R., Gebauer, B., Grimes, S.M., Lenske, H., Lieb, K.P., Massey, T.N., Milin, Matko, von Oertzen, W., Schulz, Ch., Kokalova, T., Torilov, S., and Thummerer, S.

Subjects
light nuclei, spectroscopy, Nuclear Theory, Physics::Accelerator Physics, Nuclear Experiment
Abstract

The three-neutron transfer reaction (12C, 9C) has been measured on 13C and 12C targets at 230.7 MeV incident energy. The level scheme of 16C, which was known previously up to 6.11 MeV excitation energy, has been extended up to 17.4 MeV by 14 new states. The structure of these states in terms of particle - hole configurations and possible spin assignments are discussed. In 15C the spins of the states at 6.84 MeV and 7.39 MeV could be uniquely assigned as 9/2- and 7/2-, respectively.

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results