β-γ-Zerfall des 5+-Niveaus in In 116 und γ-Verzweigungsverhältnisse in Sn 116

Abstract

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.

AbsoluteE0 andE2 transition rates and collective states in116Sn

“…(e) A 7-7 coincidence run of the 54 min 116in decay was carried out with two Ge(Li) detectors, in order to establish the position of the 278.5 keV transition placed between the 4~ and 2 + levels in [18]. This * Sign convention according to [20] [15].…”

“…The lower part of the quasi-rotational band suggested in [13] is included. Most of the branching ratios were taken from [18]. The p2 values for the E0 transitions in Figure 1 are based on the present Coulomb-excitation measurements and on our previous electron-spectroscopy work [19], except the value for p2(03+ ~0~-), which is established both from the singles and coincidence electron spectra from the 11~Sn(p,p') reaction at the IAR resonance at 6.928 MeV.…”

Multiple Reaction Correction to 15 MeV Neutron Capture Cross Section in115In

“…The y-rays from the radioactive samples were measured by a 39 cm3 Ge(Li) spectrometer. The metastable first excited state of l161n is known [18] to decay (T,,, = 54 min) by p emission to excited states in llsSn which subsequently decays by y-rays to the ground state. The strongest y-ray line in the decay is the 1293 keV line (I, = 85 520/6) from the first excited state to the ground state of 1I6Sn.…”