Filters
Results 1 - 1 of 1
Results 1 - 1 of 1.
Search took: 0.018 seconds
AbstractAbstract
[en] The excited levels of the 140Pm and 186Au odd-odd transitional nuclei have been studied by means of two complementary methods: the low-spin states populated by the β++CE decay of 140Sm and 186Hg respectively, the high-spin states by (19F,5nγ) reactions. The radioactive sources have been produced at the on-line mass-separator Isocele: γ-γ and γ-X coincidence spectra have been measured; conversion electrons were detected with Si(Li) detector working with a magnetic selector (140Pm) or with a semi-circular spectograph (186Au). The high-spin level schemes were deduced from γ-γ coincidence analysis, spins and parities from angular distribution, linear polarization and DCO measurements. The low- and high-spin states are interpreted in terms of the one quasiparticle states which appear in the adjacent odd-A nuclei. Concerning low-spin states, the coupling of two-quasiparticle angular momenta are qualitatively discussed. The hihg-spin state energies are compared to those calculated within an ''asymmetric rotor + two high-j qp'' coupling schemes
[fr]
Les niveaux excites de deux noyaux impairs-impairs de transition 140Pm et 186Au on ete etudies par des methodes complementaires: etats de bas spin peuples par des desintegration β++CE (140Sm → Pm et 186Hg → Au) et etats de haut spin peuples par reaction (19F,5nγ). Les mesures concernant les etats de bas spin ont ete effectuees aupres du separateur en ligne Isocele: coincidence γ-γ et γ-X, electrons de conversion detectes soit a l'aide d'un detecteur Si(Li) associe a un selecteur magnetique (140Pm), soit d'un spectrographe magnetique a 1800(186Au). Les schemas de niveaux de haut spin ont ete construits a partir des relations de coincidences γ-γ: les spins et parites des niveaux ont ete determines grace a des mesures de distributions angulaires, polarisations lineaires et correlations angulaires directionnelles des rayonnements γ les desexcitant. Les niveaux de bas spin et de haut spin ainsi obtenu ont ete interpretes a partir des etats a une quasi-particule presents dans les noyaux impairs voisins. Dans le premier cas, le couplage des moments angulaires des deux quasi-particules a ete discute qualitativement; les energies des etats de haut spin on ete compares aux resultats d'un modele de couplage d'un rotor asymetrique et de deux quasipaticules situees dans des sous-couches de grand JOriginal Title
Contribution a l'etude des modes de couplage neutron-proton dans les noyaux de transition: etats excites de haut spin et de bas spin de 140Pm et 186Au
Primary Subject
Source
May 1981; 170p; These (D. es Sc.).
Record Type
Report
Literature Type
Thesis/Dissertation; Numerical Data
Report Number
Country of publication
BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CORRELATIONS, DATA, ELECTRON CAPTURE RADIOISOTOPES, ENERGY-LEVEL TRANSITIONS, GOLD ISOTOPES, HEAVY NUCLEI, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, MATHEMATICAL MODELS, MINUTES LIVING RADIOISOTOPES, MULTIPOLE TRANSITIONS, NUCLEAR MODELS, NUCLEI, NUMERICAL DATA, PARTICLE PROPERTIES, PROMETHIUM ISOTOPES, RADIOISOTOPES, RARE EARTH NUCLEI
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue