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9 results on '"Dirk Schwalm"'

1. Coulomb excitation of neutron-rich Cd isotopes

Author

P. G. Thirolf, D. Martin, T. Morgan, M. Pantea, P. Reiter, Georgi P. Georgiev, C. Fransen, S. Franchoo, Dirk Schwalm, T.-H. Rolke, A. Blazhev, S. Bönig, Herbert Hess, S. Ilieva, Jan Diriken, Tomás R. Rodríguez, Oliver Kester, R. Krücken, Fredrik Wenander, P. Maierbeck, Dirk Weisshaar, Dietrich Habs, W. Weinzierl, G. S. Simpson, J. Van de Walle, Joakim Cederkäll, R. Lutter, S. Winkler, T. Sieber, P. A. Butler, D. Voulot, M. Thürauf, O. Niedermeier, F. Finke, L. M. Fraile, V. Bildstein, P. Delahaye, M. Seidlitz, Andreas Wiens, Andreas Ekström, I. Stefanescu, M. Mahgoub, Mark Huyse, J. Iwanicki, R. Gernhäuser, S. Thiel, P. Van Duppen, P. Mayet, Th. Kröll, A. Scherillo, O. Ivanov, A. M. Hurst, T. Behrens, Thomas Davinson, N. Warr, Ulli Köster, P. Kent, Heiko Scheit, 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Isotope, 010308 nuclear & particles physics, SHELL model, Shell (structure), Coulomb excitation, 7. Clean energy, 01 natural sciences, Excited state, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The isotopes 122,124,126Cd were studied in a “safe” Coulomb-excitation experiment at the radioactive ion-beam facility REX-ISOLDE at CERN. The reduced transition probabilities B(E2; 0+g.s. →2+1) and limits for the quadrupole moments of the first 2+ excited states in the three isotopes were determined. The onset of collectivity in the vicinity of theZ=50 andN=82 shell closures is discussed by comparison with shell model and beyond mean-field calculations. ispartof: Physical Review C, Nuclear Physics vol:89 issue:1 pages:1-10 status: published

Published
2014

2. Identification of excited states in theN=Znucleus68Sewith cluster detectors

Author

Dirk Schwalm, T. Servene, B. Fiedler, D. Kast, S. Skoda, S. Freund, C. Ender, Ronald Schwengner, P. Baumann, A. Jungclaus, T. Steinhardt, F. Köck, O. Thelen, J. Reif, H. Schnare, G. Winter, J. Eberth, H.G. Thomas, F. Becker, L. Käubler, C. Teich, T. Härtlein, K. P. Lieb, V. Fischer, and O. Stuch

Subjects
Physics, Triple coincidence, Nuclear and High Energy Physics, Spins, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Cluster (physics), Neutron, Atomic physics, 010306 general physics, Nucleus, Excitation, Energy (signal processing)
Abstract

A first level scheme of ${}^{68}\mathrm{Se}$ with five states up to 4.2 MeV excitation energy and tentative spins ${6}^{+}$ and ${7}^{\ensuremath{-}}$ has been established from \ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\gamma} coincidences measured with six EUROBALL Cluster detectors in close geometry. The level scheme is interpreted in comparison with neutron deficient nuclei of the $A\ensuremath{\approx}70$ region and cranking model calculations. In a similar experiment a triple coincidence between the ${}^{72}\mathrm{Kr}$ transitions 710, 611, and 792 keV has been proven.

Published
1998

3. Measurements of electromagnetic decay strengths in92Ruwith cluster detectors

Author

D. Kast, C. Lingk, T. Härtlein, H.G. Thomas, M. Weiszflog, Dirk Schwalm, J. Eberth, A. Dewald, H. Grawe, M. Górska, K. P. Lieb, C. Teich, F. Köck, R. Peusquens, A. Jungclaus, and C. Ender

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Detector, 01 natural sciences, Surface delta, Recoil, 0103 physical sciences, Cluster (physics), Atomic physics, 010306 general physics, Spin (physics), Beam energy, Parametrization
Abstract

High-spin states in ${}^{92}\mathrm{Ru}$ were populated via the reaction ${}^{58}\mathrm{Ni}{(}^{40}\mathrm{Ca},\ensuremath{\alpha}2p)$ at 145 MeV beam energy. Using six EUROBALL cluster detectors we measured lifetimes by means of the recoil distance Doppler shift method and are able to propose several significant changes in the published level scheme of ${}^{92}\mathrm{Ru}.$ While the observed spin dependence of $M1\ensuremath{-}$ and moderately enhanced $E2$-strengths is well reproduced by the shell model in the parametrization by Gross and Frenkel, the use of a surface delta residual force leads to less satisfactory results.

Published
1997

4. Coulomb excitation of2868Ni40at 'safe' energies

Author

J. Eberth, J. Cederkäll, N. Bree, S. G. Zemlyanoy, T. Kröll, M. Huyse, R. Krücken, Fredrik Wenander, V. N. Fedosseev, N. Warr, P. A. Butler, B. A. Marsh, T. Davinson, L. M. Fraile, J. Jolie, P. Van Duppen, Ulli Köster, D. V. Fedorov, J. Van de Walle, P. Reiter, I. Stefanescu, P. Delahaye, O. Ivanov, O. Niedermaier, S. Franchoo, K. Gladnishki, J. Iwanicki, Dirk Weisshaar, Heiko Scheit, Dirk Schwalm, Thomas Sieber, and Georgi P. Georgiev

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Isotope, 010308 nuclear & particles physics, Coulomb excitation, 7. Clean energy, 01 natural sciences, Electromagnetic radiation, Particle detector, Nuclear physics, Cross section (physics), symbols.namesake, 0103 physical sciences, symbols, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics, Doppler effect, Excitation
Abstract

The B(E2;0+2+) value in 68Ni has been measured using Coulomb excitation at safe energies. The 68Ni radioactive beam was postaccelerated at the CERN on-line isotope mass separator (ISOLDE) facility to 2.9 MeV/u and directed to a 108Pd target. The emitted rays were detected by the MINIBALL detector array. Not only directly registered but also indirectly deduced information on the nucleus emitting the ray was used to perform the Doppler correction, leading to a larger center-of-mass angular range to infer the excitation cross section. The obtained value of 2.8×102e2 fm4 is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low 0+2+ transition probability.

Published
2008

6. Backbending region study in160,162Dyusing incomplete fusion reactions

Author

C. Rossi-Alvarez, A. Dietrich, D. Bazzacco, S. Lunardi, A. Gadea, T. Härtlein, C. Gund, E. Farnea, C. Ur, G.B. Hagemann, Andrea Jungclaus, Dirk Schwalm, B. Binder, D. R. Napoli, D. Pansegrau, Y. Sun, G. de Angelis, H. Bauer, and J. L. Egido

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, SHELL model, Nuclear fusion
Published
2002

7. Magnetic and collective rotation in79Br

Author

G. Winter, S. Skoda, F. Becker, F. Köck, S. Kasemann, Dirk Schwalm, J. Reif, F. Dönau, P. Reiter, H. Prade, H. Schnare, T. Servene, L. Käubler, C. Ender, Ronald Schwengner, B. Fiedler, S. Freund, T. Steinhardt, H.G. Thomas, J. Eberth, O. Thelen, and T. Härtlein

Subjects
Physics, Nuclear and High Energy Physics, Quantum mechanics, Atomic physics, Rotation
Published
2002

9. Coulomb excitation of theKπ=8−isomer inHf178

Author

Th Kröll, J. Gerl, Dirk Schwalm, C. Ender, Th. Härtlein, P. Reiter, H. Xie, F. Köck, K. Vetter, A. Wieswesser, H. J. Wollersheim, and P. Thirolf

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, education.field_of_study, Projection (relational algebra), Total angular momentum quantum number, Population, Coulomb barrier, Coulomb excitation, Atomic physics, education, Ground state, Quantum number
Abstract

The ${\mathit{K}}^{\mathrm{\ensuremath{\pi}}}$=${8}^{\mathrm{\ensuremath{-}}}$ isomer at 1147.4 keV in $^{178}\mathrm{Hf}$ was populated in a Coulomb excitation experiment with $^{130}\mathrm{Te}$ ions. The measured cross section for this isomer was 2.7${\ifmmode\pm\else\textpm\fi{}}_{1.4}^{1.9}$, 4.3${\ifmmode\pm\else\textpm\fi{}}_{2.0}^{3.4}$, and 7.5${\ifmmode\pm\else\textpm\fi{}}_{3.2}^{6.1}$ mb for three beam energies below the Coulomb barrier, namely 560, 590, and 620 MeV. If one assumes that the projection of the total angular momentum on the symmetry axis, K, is only an approximate quantum number, the population of this isomer can be reproduced via direct E3 excitations of odd spin members of the isomeric band from the ground state band.

Published
1993

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