The decay of 4 min 158Tm |
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Authors: | P Aguer CF Liang J Libert P Paris A Péghaire A Charvet R Duffait G Marguier |
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Institution: | 1. CSNSM, Bâtiment 104, 91406 Orsay, France;2. Institut de Physique Nucléaire, Université Claude Bernard Lyon-1 and IN2P3, 69621 Villeurbanne, France;3. The ISOCELE Collaboration, 91406 Orsay, France |
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Abstract: | The decay of 4 min 158Tm has been investigated with on-line mass-separated samples obtained from the Orsay ISOCELE separator. Measurements of γ-rays, conversion electron lines and γ-γ bi-dimensional coincidences were performed. About 180 transitions were ascribed to the decay and two thirds of them were placed in a decay scheme. The β-band and the γ-band were identified with bandheads situated at 806.40 and 820.13 keV respectively. In addition, a number of other vibrational bands (β-γ, β-β, Kπ = 0? and 1?) are proposed. The decay properties of those bands are discussed in the framework of current nuclear models. The log ft values suggest a 2? assignment for 158Tm with the possible configuration (p404J↓-n521↑). |
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Keywords: | Radioactivity |
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