Influences on the triple alpha process beyond the Hoyle state

7 pags., 3 figs. -- International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX, 25-30 June 2006, CERNThe triple alpha process is studied using indirect methods. The beta decays of 12N and 12B are used to probe the triple alpha continuum of 12C. Different independent breakup channels are identified, consistently showing that the 10 MeV strength is dominated by a 0+ state interfering with the Hoyle state ghost. The 13–14 MeV region on the other hand is dominated by a 2 + state

Probing the maximally deformed light rare-earth region around the drip-line nucleus 130Sm

International audienceThe neutron deficient rare-earth nuclei of the A~130 region are of particular interest since highly deformed prolate ground states are expected. Indeed these nuclei are predicted to show maximal ground-state deformations of β2 ~ 0.40 (axis ratio of 3:2), comparable to the deformation deduced for superdeformed cerium isotopes at high spin. A fusion–evaporation experiment was performed with radioactive ion beams at GANIL in October 2004 which had the goal to reach very proton-rich exotic nuclei located near the proton drip-line. A radioactive 76Kr beam, delivered by the SPIRAL facility, was used to bombard a thin 58Ni target. Emitted γ-rays were detected by the EXOGAM γ-ray spectrometer which was, for the first time, coupled with both the DIAMANT charged-particle array and the VAMOS spectrometer

Study of the neutron-rich nucleus 36^{36}Si

International audienceExcited states of N=22 $^{36}$Si, populated in deep-inelastic processes produced by the interaction of a 215 MeV beam of $^{36}$S ions with a $^{208}$Pb target, were studied in the present work. $\gamma$ rays from the binary fragments detected using CLARA, an array of 25 Ge Clover detectors, were measured in coincidence with projectile-like fragments detected by PRISMA, a large solid angle magnetic spectrometer. Two new $\gamma$-ray photopeaks at energies of 1442 and 842 keV were observed and tentatively assigned to the 4+$\rightarrow$2+ and 6+$\rightarrow$4+ transitions, respectively. The systematics of the level structures of N=22 isotones are presented, and a comparison is made of the behavior of Si, Mg, and S isotopes. The level structure of $^{36}$Si is also compared with the results of sdpf shell model calculation