"SPECTROSCOPY OF TRANSFERMIUM NUCLEI USING THE GABRIELA SETUP "
Trine Hagen, University of Oslo
(id #101)
Seminar: YesPoster: No
Invited talk: No
SPECTROSCOPY OF TRANSFERMIUM NUCLEI USING THE GABRIELA SETUP
T. Wiborg-Hagen1, A. Lopez-Martens2,∗, K. Hauschild2,*, A.V. Belozerov3, M.L. Chelnokov3, V.I. Chepigin3, D. Curien4, O. Dorvaux4, G. Drafta5, B. Gall4, A. Görgen1,6, M. Guttormsen1, A.V. Isaev3, I.N Izosimov3, A.P. Kabachenko3, D.E. Katrasev3, T. Kutsarova7, A.N. Kuznetsov3, A.C. Larsen1, O.N. Malyshev3, A. Minkova7, S. Mullins8, H.T. Nyhus1, D. Pantelica5, J. Piot4, A.G. Popeko3, S. Saro9, N. Scintee5, S. Siem1, E.A. Sokol3, A.I. Svirikhin3, and A.V. Yeremin3
1 Department of Physics, Oslo University, 0316 Oslo, Norway
2CSNSM, IN2P3-CNRS, F-91405 Orsay Campus, France
∗ Department of Physics, Unviersity of Jyväskylä, 40351 Finland
3 FLNR, JINR, Dubna, 141980 Russia
4 IPHC, IN2P3-CNRS, F-67037 Strasbourg, France
5 Institute for Physics and Nuclear Engineering, Bucharest Magurele, P.O. Box MG6, Romania
6 DAPNIA/SPhN, CEA-Saclay, F-91191 Gif-sur-Yvette, France
7 Department of Atomic Physics, University of Sofia, 1164 Sofia, Bulgaria
8 iThemba Labs, P.O. Box 722, 7129 Somerset West South Africa
9 Department of Physics, Comenius University, SK-84215, Bratislava, Slovakia
The heaviest elements provide a unique laboratory to study nuclear structure and nuclear dynamics under the influence of large Coulomb forces and large mass. The spectroscopy of transfermium elements has made great progress in recent years thanks to the use of efficient detector arrays around the target position and at the focal plane of recoil separators. The data, although scarse, have shed light on some theoretical weaknesses. For e.g. there exists now a rather clear disagreement between the predictions of shell positioning obtained from all existing effective interactions/energy density functionals (predicting N=150 and Z=98,104 as sub-shell closures) and experiment (which seems to predict N=152 and Z=100 as subshell closures). Hence, the systematic study of the structure and decay properties of deformed transfermium elements is essential, and probably for many years, the only available way to reach an understanding of the structure at the upper end of the nuclear chart.
A detection system [1] dedicated to the spectroscopy of transfermium nuclei has recently been constructed at the focal plane of the VASSILISSA separator at the FLNR, Dubna, by a Franco-Russian collaboration. The results from the last campaign will be presented.
1. K. Hauschild, et al., Nucl. Instr. Methods Phys. Res. Sect. A560 388 (2006).
2. A.G. Popeko, et al., AIP Conf. Proc. 912, 456 (2007).
T. Wiborg-Hagen1, A. Lopez-Martens2,∗, K. Hauschild2,*, A.V. Belozerov3, M.L. Chelnokov3, V.I. Chepigin3, D. Curien4, O. Dorvaux4, G. Drafta5, B. Gall4, A. Görgen1,6, M. Guttormsen1, A.V. Isaev3, I.N Izosimov3, A.P. Kabachenko3, D.E. Katrasev3, T. Kutsarova7, A.N. Kuznetsov3, A.C. Larsen1, O.N. Malyshev3, A. Minkova7, S. Mullins8, H.T. Nyhus1, D. Pantelica5, J. Piot4, A.G. Popeko3, S. Saro9, N. Scintee5, S. Siem1, E.A. Sokol3, A.I. Svirikhin3, and A.V. Yeremin3
1 Department of Physics, Oslo University, 0316 Oslo, Norway
2CSNSM, IN2P3-CNRS, F-91405 Orsay Campus, France
∗ Department of Physics, Unviersity of Jyväskylä, 40351 Finland
3 FLNR, JINR, Dubna, 141980 Russia
4 IPHC, IN2P3-CNRS, F-67037 Strasbourg, France
5 Institute for Physics and Nuclear Engineering, Bucharest Magurele, P.O. Box MG6, Romania
6 DAPNIA/SPhN, CEA-Saclay, F-91191 Gif-sur-Yvette, France
7 Department of Atomic Physics, University of Sofia, 1164 Sofia, Bulgaria
8 iThemba Labs, P.O. Box 722, 7129 Somerset West South Africa
9 Department of Physics, Comenius University, SK-84215, Bratislava, Slovakia
The heaviest elements provide a unique laboratory to study nuclear structure and nuclear dynamics under the influence of large Coulomb forces and large mass. The spectroscopy of transfermium elements has made great progress in recent years thanks to the use of efficient detector arrays around the target position and at the focal plane of recoil separators. The data, although scarse, have shed light on some theoretical weaknesses. For e.g. there exists now a rather clear disagreement between the predictions of shell positioning obtained from all existing effective interactions/energy density functionals (predicting N=150 and Z=98,104 as sub-shell closures) and experiment (which seems to predict N=152 and Z=100 as subshell closures). Hence, the systematic study of the structure and decay properties of deformed transfermium elements is essential, and probably for many years, the only available way to reach an understanding of the structure at the upper end of the nuclear chart.
A detection system [1] dedicated to the spectroscopy of transfermium nuclei has recently been constructed at the focal plane of the VASSILISSA separator at the FLNR, Dubna, by a Franco-Russian collaboration. The results from the last campaign will be presented.
1. K. Hauschild, et al., Nucl. Instr. Methods Phys. Res. Sect. A560 388 (2006).
2. A.G. Popeko, et al., AIP Conf. Proc. 912, 456 (2007).
