Showing papers by "R. F. Casten published in 2012"
University of Surrey1, King Abdulaziz City for Science and Technology2, Australian National University3, University of Santiago de Compostela4, GSI Helmholtz Centre for Heavy Ion Research5, Yale University6, TRIUMF7, University of Vigo8, Polish Academy of Sciences9, University of Valencia10, Hungarian Academy of Sciences11, University of Cologne12, University of Brighton13, Osaka University14, Lund University15, University of Edinburgh16
TL;DR: In this article, a number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed and correlated with secondary ions on an event-by-event basis.
Abstract: decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.
17 citations
13 citations
TL;DR: In this article, the authors presented the results of a survey of the Bulgarian National Academy of Sciences' research work in the field of nuclear energy and applied it to the problem of nuclear power.
Abstract: Y. Oktem,1 D. L. Balabanski,2 B. Akkus,1 L. Amon Susam,1 L. Atanasova,2 C. W. Beausang,3,4 R. B. Cakirli,1,5 R. F. Casten,3 M. Danchev,6,7 M. Djongolov,6,7 E. Ganioglu,1 K. A. Gladnishki,7 J. Tm. Goon,8 D. J. Hartley,6,9 A. A. Hecht,3,10 R. Krucken,3,11 J. R. Novak,3 G. Rainovski,7 L. L. Riedinger,6 T. Venkova,2 I. Yigitoglu,12 N. V. Zamfir,3,13 and O. Zeidan6 1Department of Physics, Istanbul University, Vezneciler, 34134, Istanbul, Turkey 2Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria 3Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA 4Department of Physics, University of Richmond, Richmond, Virginia 23173, USA 5Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany 6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 7Faculty of Physics, St. Kliment Ohridski University of Sofia, BG-1164 Sofia, Bulgaria 8Louisiana State University Department of Physics and Astronomy 202 Nicholson Hall, Tower Drive, Baton Rouge, Louisiana 70803-4001, USA 9Department of Physics, U.S. Naval Academy, Annapolis, Maryland 21402, USA 10Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA 11TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada 12Gaziosmanpasa University, Science Faculty, Turkey 13National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, Romania (Received 14 July 2012; published 12 November 2012)
5 citations
TL;DR: In this paper, the authors used the perturbed angular correlation technique in a static external magnetic field to measure the $g$ factor of the Hf isotopes and compared the predictions of several models.
Abstract: The $g$ factor of the ${2}_{1}^{+}$ state of ${}^{168}$Hf was measured using the perturbed angular correlation technique in a static external magnetic field. The result, $g({2}_{1}^{+})=0.17(3)$, is discussed in relation to the systematics of the previously reported $g$ factors in the Hf isotopes and compared to the predictions of several models. An interesting outcome of the analysis presented in this paper has to do with the relatively small result for the $g$ factor. This indicates that in the Hf isotopes, a minimum in the $g$(${2}_{1}^{+}$) dependence on $N$ occurs at $N\ensuremath{\le}98$ and not at midshell, as expected from IBA-2 or large-scale shell-model calculations. The pairing plus quadrupole model of Kumar and Baranger predicts a minimum at $N=98$ and gives the best description of the experimental data. The present result clearly shows the importance of $g$-factor measurements in ``fine-tuning'' among different models.
2 citations