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Production and study of exotic nuclei in new regions of deformation

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This proposal aims to combine highly specialised new techniques to obtain nuclear structure information on the boundary of nucleon stability. Since several years there has been a worldwide effort (both financially and the technically) to produce nuclei far from the valley of b-stability aiming to study the behaviour of nuclear interactions in extreme conditions of isospin. These often scarcely produced nuclei need special identification techniques in order to study them. Now these nuclei can be produced and selected in sufficient amount, to allow high precision measurements.
Efforts have been made by several groups in this collaboration, to adapt exciting techniques which are well established and have been very successfully applied to study nuclei near stability, in order to be able to study now nuclei far from stability. Because very little is known on these exotic nuclei - while indications have been found for very different behaviour - a joint effort is necessary to understand the nucleonic structure and interactions for exotic nuclear matter.
By combining the knowledge of the four partners in this collaboration, each having its specific specialisation, otherwise excluded experiments will now become possible. The Laser Spectroscopy technique is one of the specialities of the Dubna group, and allows to study radii, static moments and spins of nuclei produced at the Microtron in Dubna (thus having non-oriented spins). While this technique works very well for long-living radioactivity, a complementary technique based on nuclear level mixing is used by the Leuven group to study the nuclear moments of short-lived nuclear states produced and spin-oriented in fragmentation reactions at GANIL. For these Level Mixing techniques, some special sometimes rare - crystals are needed. They will be produced by the Kiev group. The Dubna group will also deliver some highly exotic stable materials to allow production of the exotic radioactive nuclei, while the Kiev group will provide also the gamma-spectroscopy techniques. While static quadrupole moment can only be determined for nuclei with spin > 0.5 dynamic moments can be measured for the even even I=0 ground states of exotic nuclei. Dynamic moments reveal similar and complementary information to static moments. The GANIL group will use gamma spectroscopy techniques, combined by new identification techniques, to obtain this complementary information, in experiments being a collaboration with other laboratories (including Leuven and Dubna).
As a result, different measuring techniques will lead to a common output: to understand better the nature of nuclear matter near the boundary of stability, where the proton-to-neutron ratio is very different from the value near stability. The information will be obtained by extracting static and dynamic nuclear moments which are sensitive both to collective and single particle nature of these nuclei.
Thus during the period of 2001-2003 some of the common Dubna-GANIL-Leuven-Kiev experiments will be planned (first proposals have already been submitted at GANIL) using the unique techniques elaborated in these Institutes and using exotic beams of the Dubna and GANIL accelerator facilities. The data analysis will be performed by common research teams with an active participation of young scientists, resulting in a Dr thesis preparation.
To coordinate and make the common research more fruitful workshops will be foreseen once per year. The current experimental results and details of the future experiments will be a topic of such meetings.

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Katholieke Universiteit Leuven
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Adresse
Celestijnenlaan 200D
3001 Leuven
Belgien

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-2000-00463/de

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