Structure of high-spin states in 143Pm |
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Authors: | H Prade L Käubler U Hagemann HU Jäger M Kirchbach L Schneider F Stary Z Roller V Paar |
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Institution: | Zentralinstitut für Kernforschung Rossendorf/Dresden, DDR;Institute “Rudjer Bo?kovi?, Zagreb, Yugoslavia;Prirodoslovno-matemati?ki fakultet, University of Zagreb and Institute “Rudjer Bo?kovi?”, Zagreb, Yugoslavia |
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Abstract: | High-spin states of 143Pm have been studied in the reactions 141Pr(α, 2n)143Pm and 143Nd(d, 2n)143Pm by means of in-beam spectroscopy. The level scheme, spin and parity assignments are based on results obtained from singles γ-ray spectra, conversion electron spectra, prompt and delayed γ-γ coincidences, γ-ray angular distribution and linear polarization measurements. Positive- and negative-parity states with energies up to 4580 keV and spins up to have been established including 22 new levels. For two nanosecond isomeric states the nuclear spin precession in an external magnetic field was observed providing the following g-factors: The experimental results are well understood by calculations which have been performed in the framework of the shell model (for positive-parity states of 11 valence protons above a Z = 50, N = 82 core) and of the cluster-vibration model (for 3 holes in a Z = 64, N = 82 core). In the case of positive-parity states no evidence for particle-core coupling could be found, while the negative-parity states could qualitatively be understood within the particle-core coupling picture. |
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Keywords: | Nuclear reactions |
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