https://doi.org/10.1140/epja/i2013-13109-5
Regular Article - Experimental Physics
Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn
1
Institut de Physique Nucléaire, IN2P3-CNRS/Université Paris-Sud, F-91406, Orsay Cedex, France
2
Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble Cedex, France
3
Department of Physics, University of York, YO10 5DD, York, UK
4
Faculté des sciences de Tunis, 1060, Tunis, Tunisia
5
Instituut voor Kern- en Stralingsfysica, B-3001, Leuven, Belgium
6
Petersburg Nuclear Physics Institute, 188350, Gatchina, Russia
7
ISOLDE, CERN, CH-1211, Genève, Switzerland
8
Grupo de Fısica Nuclear, Universidad Complutense, 28040, Madrid, Spain
9
Institut für Physik, Johannes Gutenberg Universität, D-55099, Mainz, Germany
10
Institut Laue-Langevin, F-38042, Grenoble Cedex 9, France
11
TRIUMF, V6T 2A3, Vancouver, Canada
12
University of Wisconsin-La Crosse, WI 54601, La Crosse, USA
13
Centre de Sciences Nucléaires et de Sciences de la Matière, F-91405, Orsay, France
14
Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Technische Universität München, D-85748, Garching, Germany
15
Institute of Experimental Physics, University of Warsaw, Warsaw, Poland
* e-mail: sauvage@ipno.in2p3.fr
Received:
17
December
2012
Accepted:
11
July
2013
Published online:
6
September
2013
The /EC decay of 185Tl was studied at the ISOLDE facility, the
-rays belonging to 185Hg have been identified and a partial low-spin level scheme of 185Hg has been built. The decay of 185m+gHg was studied at the ISOCELE facility. Conversion electron lines of very low-energy transitions were observed for the first time. Electron data have been obtained for four transitions in 185Au and two transitions in 185Hg . From the analysis performed using an internal energy calibration procedure the energy location of the 185mHg has been determined to be
keV. This
value is consistent with that determined independently,
keV, using 185m+gHg
-decay data from literature. New
particles emitted from 189m+gPb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility.
-
coincidence results have served to locate the
isomeric state of 189Pb at
keV. This latter
value added to
-decay data from literature have allowed the energy location of the
isomeric states of 193Po and 197Rn at 95(7)keV and 194(12)keV, respectively. The nuclear structure of the isomeric and ground states in the nuclei of the three
-emitter chains starting with 195m+g, 197m+g, 199m+gRn are discussed.
© SIF, Springer-Verlag Berlin Heidelberg, 2013