Étude de la transmutation 195mHg + 195Hg → 195Au

Les rayonnements, émis par des sources isotopiquement pures et de haute activité de 195mHg et 195Hg, ont été étudiés avec un spectromètre magnétique π √2 et des spectromètres à jonction Si(Li) ou Ge(Li). Les intensités absolues de toutes les transitions et plus de cinquante multipolarités ont été déterminées avec précision. Ces mesures ont permis de faire de nouvelles attributions de spin et parité pour 18 niveaux de moyenne et haute énergie de l'or 195. Dans ce même noyau, trois niveaux sont proposés à 637,8 ; 946,7 et 1 443,2 keV. Une interprétation du schéma de niveaux de l'or 195 est donnée selon les modèles à couplage intermédiaire de Kisslinger- ' Sorensen et Alaga-Ialongo-Paar. Enfin le caractère plus ou moins collectif des premiers niveaux de 195Au et 195Hg est déduit de l'analyse détaillée des probabilités réduites de transitions électromagnétiques

Dynamic IMF production in 24Mg+27Al^{24}Mg + ^{27}Al at intermediate energies

The azimuthal correlations and polar-angle distributions of intermediate-mass fragments (IMFs) produced in Mg+Al at 45 an 95 AMeV were studied. Measurements of $\alpha$-particles and IMFs with $3\le Z\le8$ emmitted in the mid-rapidity region for mid-central events were compared to IQMD results and results from a static-source model. A maximum in the azimuthal-correlation function at 180\degree\/ can not be described by independently emmitted particles. Momentum conservation of a small source as well as target-projectile correlations from IQMD show the same azimuthal correlations as the experimental data. The polar-angle distributions in the experimental data show a target-projectile seperation, thus giving evidence of dynamic IMF production.\\ {\it Keywords:} dynamic multifragmentation, IMF, IQMD, azimuthal correlations

Author Correction: Dynamic regulation of canonical TGFβ signalling by endothelial transcription factor ERG protects from liver fibrogenesis.

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IMF-IMF azimuthal correlations as a tool to probe reaction dynamics in Ar-36+Ti-48 at 45 A MeV

IMF-IMF azimuthal correlation functions have been measured in 36Ar + 48Ti collisions at 45 A MeV. The experimental data as well as the events generated with IQMD were sorted with respect to impact parameter and the analysis was restricted to the mid-rapidity region. We find strong anisotropies and asymmetries in the measured correlation functions, which cannot be described by independently emitted particles. The measured correlation functions are, however, well reproduced by IQMD model calculations, although decay of a small mid-rapidity source cannot be excluded experimentally

Heating of nuclei with energetic anti-protons

International audienceHigh-energy γ rays associated with the decay of the giant dipole resonance have been measured for two fusion reactions leading to the 140Sm compound nucleus at an excitation energy of 71 MeV. The observed yield increases with the asymmetry in the ratios of the number of neutrons to protons in the entrance channel. This is interpreted as resulting from giant dipole phonons excited at the moment of collision in an N/Z asymmetric reaction