Nuclear structure analysis using the Orange Spectrometer

Journal Article · Wed Jan 28 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3086994· OSTI ID:21255391

Regis, J -M; Pascovici, Gh; Christen, S; Meersschout, T; Bernards, C; Fransen, Ch; Dewald, A; Braun, N; Heinze, S; Thiel, S; Jolie, J ^[1]; Materna, Th ^[2]

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1. IKP der Universitaet zu Koeln, Zuelpicher Str. 77, D-50937 Koeln (Germany)
2. Institut Laue Langevin, 6 rue Jules Horowitz, F-38043 Grenoble (France)

Recently, an Orange spectrometer, a focusing iron-free magnetic spectrometer, has been installed at a beam line of the 10 MV Tandem accelerator of the IKP of the University of Cologne. The high efficiency of 15% of 4{pi} for the detection of conversion electrons and the energy resolution of 1% makes the Orange spectrometer a powerful instrument. From the conversion electron spectrum, transition multipolarities can be determined using the so called K to L ratio. In combination with an array of germanium and lanthanum bromide detectors, e{sup -}-{gamma}-coincidences can be performed to investigate the level scheme. Moreover, the very fast lanthanum bromide scintillator with an energy resolution of 3% allows e{sup -}-{gamma} lifetime measurements down to 0.3 ns. A second Orange spectrometer can be added to build the Double Orange Spectrometer for e{sup -}-e{sup -}-coincidences. It is indispensable for lifetime measurements of low intensity or nearby lying transitions as often occur in odd-A and odd-odd nuclei. The capabilities are illustrated with several examples.

• OSTI ID: 21255391
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1090; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRON SPECTRA
ENERGY LEVELS
ENERGY RESOLUTION
FOCUSING
GAMMA SPECTROSCOPY
GERMANIUM BROMIDES
ION BEAMS
LANTHANUM BROMIDES
LIFETIME
MAGNETIC SPECTROMETERS
MULTIPOLARITY
NUCLEAR STRUCTURE
ODD-ODD NUCLEI
PHOSPHORS
SCINTILLATIONS
TANDEM ELECTROSTATIC ACCELERATORS