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The level scheme of 1S~Eu has been investigated by means of thermal neutron capture yrays and conversion electrons. The high energy y-ray spectrum from thermal neutron capture in enriched 153Eu has been studied in the energy range of 5700 to 6500 keV. Low energy y radiation has been observed with Ge(Li) and Si(Li) detectors from 5 to 300 keV and conversion electrons have been measured from 15 to 300keV. Low energy (n, yy) coincidences and half lives of transitions have been measured. The data, combined with three very recent studies of the 8-isomer decay in iS~Eu has led to the construction of a level scheme with 12 excited levels.Nuclear Reaction 153Eu(n ' 7), E, = thermal, measured E.;, I~, Ece, Ice , yy-coincidence, halflives, 154Eu deduced levels.

ZeitschriftPhysik A 9 by Springer-Verlag 1977 Nanosecond lifetimes of low-lying levels in the doubly odd nucleus 122Sb have been measured. On the basis of these results and of already published experimental material, spins and parities for most of the low-lying states are proposed. A simple theoretical description of this nucleus is presented. The model used is that of a proton coupled to a number projected neutron quasiparticle wave function, assuming a Z =N = 50 core. The spectrum and transition rates were calculated in a shell model space consisting of eight subshells and using a renormalized Schiffer interaction. The shell model parameters were derived from adjadent nuclei. Good agreement with the experimental level scheme is found. Also the gamma decay properties can be accounted for rather well. Spectroscopic factors for the one-neutron transfer reactions leading to ~22Sb are predicted. Their measurement with high resolution techniques would be a helpful test for the interpretations given.Nuclear Reactions Sb(n, 7), E = th; measured 7-7 coin. a 22Sb deduced J, ~, 7-branching, mean life. 1248b deduced mean life. Natural target, Ge(Li), NaI(T1) detectors.

Eingegangen am 16. Juli 1970 fl-y-Decay of the 5+-Level in In 116 and y-Branching Ratios in Sn 116The ~,-spectrum, emitted in the fl-y-decay of the 5 + state of In 116, has been measured with a Ge(Li)-detector. 19 unknown transitions in Sn 116 have been found, most of which could be fitted uniquely into the established level scheme. A new ,0-transition (logft=5.6) to the 3,096 keV level has been found. Branching ratios are given and a possible band structure in Sn 116 is discussed. EinleitungEs ist zu hoffen, dal3 sich bei den Sn-Isotopen, die eine abgeschlossene Protonenschale (Z= 50) besitzen, in absehbarer Zeit die Struktur der Anregungszusffmde unter etwa 3 MeV rnit Hilfe von Modellrechnungen befriedigend beschreiben 1/iBt. Umfangreiche und genaue Informationen fiber Niveauparameter und Obergangswahrscheinlichkeiten bei diesen Kernen sind n6tig, urn die Zuordnung der experirnentell gefundenen zu den theoretisch vorausgesagten Energiezust~inden sicher zu erm/Sglichen und darnit genaue Tests der verschiedenen Modellmodifikationen zu gestatten. Sn 116 eignet sich besonders gut fiir einen Vergleich zwischen experimentell gefundener Kernstruktur und theoretischen Voraussagen, da sein Niveauschema besser bekannt ist als das der anderen Sn-lsotope. Dieser Kern wurde deshalb h~iufig herangezogen, um Modellrechnungen, die ftir gg-Kerne mit einer abgeschlossenen Schale gelten sollen, zu testen 1 -lo. Die neuesten theoretischen Arbeiten fiber Sn 116 finden sich 1 Arvieu, R., Baranger, E., Veneroni, M., Baranger, M., Gillet, V.

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