Studies on the decoupled rotation bands in the nuclei 79Rb, 81Rb, and 79Kr
Description
High spin states in 79Rb, 81Rb, and 79Kr were studied by means of the following reactions: 63Cu(19F,p2n)79Rb, 70Ge(12C,p2n)79Rb, 65Cu(16O,2n)79Rb, 65Cu(19F,p2n)81Rb, 63Cu(19F,2pn)79Kr, and 70Ge(12C,2pn)79Kr. On the base of γ single spectra, excitation functions, γ angular distributions, γγ and nγ coincidences, RDDS- and DSA lifetime measurements a level scheme of 79Rb with 13 new found excited states is proposed. Also a series of stretched E2-transitions between posivite parity states in 79Kr could be identified. The observed M1 and E2 transition probabilities, which were obtained via the experimental determination of the lifetime as well the branching ratio of 26 excited states, form the base for a comprehensive discussion of the nuclear structure of the studied isotopes. For this reason theoretical calculations with the asymmetric rotor-plus-quasiparticle with variable moment of inertia (AROVMI) as well with the interacting boson-fermion (IBVM) model were performed. The good agreement between experiment and theory permits to relate the decrease of the B(E2)-values in 79Rb to a finite dimensional (N=8) boson space, to cancel the discrepancies stated by Friederichs et.al., and to analyze 79Kr the influence of a gsub(9/2) neutron on the deformation of the 78Kr core. (orig./HSI)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Hochspinzustaende in 79Rb, 81Rb und 79Kr wurden mit Hilfe der folgenden Reaktionen untersucht: 63Cu(19F,p2n)79Rb, 70Ge(12C,p2n)79Rb, 65Cu(16O,2n)79Rb, 65Cu(19F,p2n)81Rb, 63Cu(19F,2pn)79Kr und 70Ge(12C,2pn)79Kr. Auf der Basis von γ-Einzelspektren, Anregungsfunktionen, γ-Winkelverteilungen, γγ- und n-γ-Koinzidenzen, RDDS- und DSA-Lebensdauermessungen wird ein Niveauschema von 79Rb mit 13 neu gefundenen angeregten Zustaenden vorgeschlagen. Ebenso konnte eine Folge gestreckter E2-Uebergaenge zwischen Zustaenden positiver Paritaet in 79Kr identifiziert werden. Die beobachteten M1-, E2-Uebergangswahrscheinlichkeiten, die ueber die experimentelle Bestimmung der Lebensdauer sowie des Verzweigungsverhaeltnisses von 26 angeregten Zustaenden gewonnen wurden, bilden die Basis fuer eine umfassende Diskussion der Kernstruktur der untersuchten Isotope. Zu diesem Zweck wurden theoretische Rechnungen mit dem asymmetrischen Rotor-plus-Quasiteilchen mit variablem Traegheitsmoment AROVMI- sowie mit dem Interacting Boson-Fermion-(IBFM)-Modell durchgefuehrt. Die gute Uebereinstimmung zwischen Experiment und Theorie erlaubt es, das Absinken der B(E2)-Werte in 79Rb auf einen Boson-Raum endlicher Dimension (N=8) zurueckzufuehren, die von Friederichs et al. festgestellten Diskrepanzen in 81Rb zu beheben und in 79Kr den Einfluss eines gsub(9/2)-Neutrons auf die Deformation des 78Kr-Rumpfes zu analysieren. (orig./HSI)
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Additional details
Additional titles
- Original title (German)
- Untersuchungen an den entkoppelten Rotationsbanden in den Kernen
Publishing Information
- Imprint Pagination
- 120 p.
- Report number
- INIS-mf--9103
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 15055090
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Numerical Data, Thesis
- Descriptors DEI
- ANGULAR DISTRIBUTION; BRANCHING RATIO; CARBON 12 REACTIONS; COPPER 63 TARGET; COPPER 65 TARGET; DE-EXCITATION; ENERGY DEPENDENCE; ENERGY SPECTRA; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; E2-TRANSITIONS; FLUORINE 19 REACTIONS; GAMMA SPECTRA; GERMANIUM 70 TARGET; HEAVY ION FUSION REACTIONS; HIGH SPIN STATES; INTERACTING BOSON MODEL; KRYPTON 79; LIFETIME; MEV RANGE 10-100; M1-TRANSITIONS; NEUTRONS; OXYGEN 16 REACTIONS; PARTICLE-CORE COUPLING MODEL; PHOTONS; PROTONS; ROTATIONAL STATES; RUBIDIUM 79; RUBIDIUM 81; STRENGTH FUNCTIONS
- Descriptors DEC
- BARYONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CATIONS; CHARGED PARTICLES; DATA; DAYS LIVING RADIOISOTOPES; DISTRIBUTION; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EVEN-ODD NUCLEI; EXCITED STATES; FERMIONS; FUNCTIONS; HADRONS; HEAVY ION REACTIONS; HOURS LIVING RADIOISOTOPES; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; INFORMATION; INTERMEDIATE MASS NUCLEI; IONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; KRYPTON ISOTOPES; MASSLESS PARTICLES; MATHEMATICAL MODELS; MEV RANGE; MINUTES LIVING RADIOISOTOPES; MULTIPOLE TRANSITIONS; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; NUCLEOSYNTHESIS; NUMERICAL DATA; ODD-EVEN NUCLEI; RADIOISOTOPES; RUBIDIUM ISOTOPES; SECONDS LIVING RADIOISOTOPES; SHELL MODELS; SPECTRA; SYNTHESIS; TARGETS
Optional Information
- Notes
- With 76 refs.