190 research outputs found

    Mesure de durées de vie au moyen de champs hyperfréquences

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    Des champs électriques synchrones pulsent le faisceau, puis modulent en énergie des électrons K, ou bien modulent les deux électrons K d'une cascade

    IRREGULARITIES IN THE YRAST LINE OF 156Er

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    The variation of the moment of inertia vs the rotational frequency has been investigated at high spin values using the141Pr(19F, 4nγ) 156Er reaction. In addition to the backbending at I = 12 ħ, a second one has been found at I = 26 ħ. Calculations performed by the Warsaw group with the HFB cranking model suggest a probable neutron effect

    Extended investigation of superdeformed bands in 151,152^{151,152}Tb nuclei

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    A detailed study of known and new SD bands in Tb isotopes has been performed with the use of the EUROBALL IV -ray array. The high-statistics data set has allowed for the extension of known SD bands at low and high spins by new -ray transitions. These transitions, as it turns out, correspond to the rotational frequencies where the principal superdeformed gaps (Z=66,N=86) close giving rise to up- or down-bending mechanisms. This enables to attribute the underlying theoretical configurations with much higher confidence as compared to the previous identifications. Five new SD bands have been discovered, three of them assigned to the 152Tb and the two others to the 151Tb nuclei. Nuclear mean-field calculations have been used to interpret the structure of known SD bands as well as of the new ones in terms of nucleonic configurations

    Shape coexistence, evolution and the parallel proton-neutron core breaking in 15568Er87 studied with the help of the BaF2 4π-detection system

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    A discrete γ-ray study of 155Er has been performed. A level scheme up to spin 85/2 has been established and interpreted using the deformed Woods-Saxon cranking approximation, taking into account pairing forces. Interpretation in terms of shape coexistence, band termination and breaking of the (Z=64, N=82) core is proposed

    The superdeformation phenomenon in atomic nuclei: Experimental status and immediate prospects

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    The superdeformation phenomenon in atomic nuclei

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    The superdeformation phenomenon in atomic nuclei

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    After the discovery of discrete rotational bands corresponding to superdeformed nuclei with spin around 60h, the study of the structure of these nuclei over the last five years has witnessed a significant expansion in physical understanding with the emergence of new phenomena and in a technical development with the construction of sophisticated apparatus to examine these nuclei. On the eve of the approaching operation of news detectors such as EUROGAM resulting from a French-British collaboration,or the American GAMMASPHERE, this article discusses the present state of knowledge on superdeformation and exposes the theoretical basis as well as recent experimental results in the field

    Effective gs_s values for a few odd deformed nuclei

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