Documents de présentation
Systems far from
Despite major and numerous recent progresses in \textit{ab initio} calculations, it is not yet possible to describe ground state nuclear properties over the whole chart with this approach. Therefore, Energy Density Functionals remain the tool of choice to such end so far. If one wishes then to build a functional with free parameters suited for astrophysical applications, one must \textit{at...
SPIRAL2/NFS is equipped with a the system for irradiation by charged particles and subsequent measurements of activation. The IC (Irradiation Chamber) and PTS (Pneumatic Transfer System) allow for cross-section measurements of short-lived isotopes produced on LINAC charged particle beams. Experiments on proton and deuteron beams were performed with Fe and Mo samples, respectively. Current...
The electric dipole (E1) and magnetic dipole (M1) excitations of nuclei are excellent probes to study the nuclear structure and dynamics from both experimental and theoretical point of view. Also, the behavior of dipole excitations is known to be highly sensitive to extreme conditions of temperature and neutron excess [1-4]. In this work, the finite temperature relativistic quasiparticle...
The experimental investigation of fission was focused on neutron-induced fission, in which flux of neutrons is sent to a stable heavy target where the fission process takes place. In the direct kinematics, because of the fission fragments' low velocity, only the full identification of mass distribution of the fragments was possible. In 1994, K.-H. Schmidt, et al.[1] introduced a new technique,...
Fission shape isomers (SI) are poorly understood metastable states characterized by a second superdeformed potential energy minimum co-existing with normal deformed states in the low-spin regime [1]. Although many such isomers have been observed in the actinide region, our understanding of the states in the second minimum remains very limited. For most SIs, the only available information is...
Recent advancements in active target detectors, enabling the detection gas to act as a target for nuclear reactions, have provided a significant boost to the exploration of nuclei near the drip lines and the exotic nuclear phenomena associated with them. ACTAR-TPC at GANIL is a novel detector of such kind that can construct a 3-D mapping of the decay or reaction products from two-dimensional...
The neutron rich region around A ~ 100 is of special interest in nuclear structure for its many rapid shape transitions. Their exact properties are predicted differently by different nuclear structure models, making this region well suited as a testing ground.
In 2017, experiment E706 populated close to a hundred nuclides in this region using the fusion fission reaction of a 6.2 MeV/u U-238...
More than 80 years after its discovery, a complete description of the fission
process remains a challenge. It is a many-body dynamic problem involving both
microscopic and macroscopic aspects of nuclear matter. Technological breakthroughs
such as the development of Gen-IV reactors and various fundamental aspirations bring
motivation for the scientific community to have a better...
Flexibility and strong polarization of its beta crystalline phase has made the homopolymer PVDF (Polyvinylidene Fluoride) a worldwide studied piezomaterial in the development of piezogenerators and the domain of energy harvesting. The race to achieve the best piezoperformances with this material is on. The actual research trend is focused on developing flexible composite piezomaterials with...
This research is focused on studying nuclear structure in the A ~ 100 region, with a particular emphasis on the N ~ 56 isotone group. The presence of the h11/2 intruder orbital in this group significantly impacts the nuclear shape. The main goal of this study is to investigate the existence of a two-quasi-neutron octupole band within this isotone group.
For this purpose, fusion-evaporation...
In reactors, oxygen is present in abundance in the form of water, and/or in the form of oxide in the fuel used (in the case of Pressurised Water Reactors and Fast Reactors). These oxygen nuclei are responsible for 25% of helium formation in nuclear reactors due to the reaction 16O(n,α)13C. However, this reaction still shows significant discrepancies between experimental and evaluated data that...
Study of exotic nuclei interesting for applied and fundamental nuclear physics with Total Absorption Gamma Spectroscopy (TAGS)
*J.Pépin¹⁾ ²⁾ for the IGISOL I241 collaboration
1) IFIC, CSIC Spain
2) SUBATECH, CNRS/IN2P3, IMT-Atlantique, Nantes Université, France
jpepin@subatech.in2p3.fr
Abstract: Beta decay of neutron rich nuclei is particularly important...
The study of nuclear fission [1] plays a crucial role in understanding the fundamental aspects of nuclear physics and holds significant applications across various fields, including power production, space exploration, and the synthesis of radioisotopes for medical applications. In the ongoing fission campaign at the VAMOS++ facility [2], located at GANIL, we investigate the phenomenon of...
The fusion probability for the production of superheavy nuclei (SHN) in cold fusion reactions (1n channel) on
