WORKING GROUPS, TOPICS AND CONVENORS

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In-beam and decay spectroscopy, reactions at Coulomb barrier energies (fusion etc.), mass spectrometer developments, identification through LCP and neutrons etc.

The aim of this working group is to identify the key physics questions to be addressed  and techniques to be used in the spectroscopic study of exotic nuclei bordered around  the N=Z and proton-drip lines. The SPIRAL2 facility will afford unique opportunities for such studies. The main physics questions are yet to be defined, but topics will include T=0 and T=1 np-pairing modes around N~Z, prompt exotic particle decay of excited states near or beyond the drip-line, spectroscopy of states of significance for the astrophysical rp-process and the breakdown of isospin symmetry with increasing A, T and Tz. The possiblility of high intensity stable beams at GANIL will also open up new opportunities in this area. The working group will also consider the main experimental techniques to be used and the instrumentation to be developed in order to address the physics.

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The Heavy and Superheavy Elements working group will concentrate on structure studies of the heaviest nuclei, exploiting the intense radioactive and stable beams available at SPIRAL2. The group will define prompt and focal plane key experiments and reactions to be used using separators and gamma arrays such as VAMOS, LISE, EXOGAM and AGATA. Any new spectrometer or instrumentation required to perform spectroscopy of heavy elements will be identified.

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In-beam and decay spectroscopy using deep-inelastic (or quasi-elastic) reactions, possibly induced fission, mass spectrometer developments, etc.

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The aims of this group are to determine the research areas and equipment required to carry out intermediate energy, in-beam, gamma spectroscopy at GANIL both in the near future and in the Spiral2 era. We plan to cover experimental techniques leading to the excited states of the most exotic nuclei like fragmentation, few nucleon exchange reactions or inelastic scattering of radioactive beams as well as discussing the possibilities of improving the actual experimental facilities in order to exploit new exciting areas. In the short term (3-5 years), from a technical point of view we can think of using combinations of existing equipment like VAMOS, SPEG, LISE with EXOGAM, Chateau de Crystal, AGATA demonstrator, in addition to possibilities of utilising detectors from other laboratories. For the long range term, we can think of exploiting the possibilities of parallel use of GANIL and Spiral beams by constructing dedicated devices for intermediate energy spectroscopy, which are also applicable with post-accelerated Spiral beams.

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The new SPIRAL-2 facility will provide unique opportunities in the field of nuclear structure studies, including the nuclear structure at high spin and large deformation. The intense neutron-rich beams will, for the first time, give access to high-spin states in neutron-rich nuclei, where new phenomena and symmetries are expected to occur, and which can sustain very high angular momenta, also giving access to new physics.

Additional opportunities will come from the intense stable beams delivered by the SPIRAL-2 injector. It is the aim of this working group to define the key experiments and the needs for instrumentation and beam developments in order to achieve the goals as outlined in the Physics White Paper of SPIRAL-2 for this domain.

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The aim of this Working Group is to prepare key experiments and define general experimental requirements for studying collective modes in the continuum by gamma-ray probes mainly. On one hand, the properties of hot exotic nuclei will be investigated in terms of vibrational collective states, such as Giant Dipole, Giant Quadrupole and Pygmy dipole resonances. The shape evolution of the system will also be studied as a function of spin and in relation with Jacobi shape transitions and feeding properties of highly deformed yrast structures. On the other hand the WG will comprise the study of the high-lying collective rotational states in exotic nuclei. This can be investigated both in terms of  rotational damping mechanism, as a function of mass, deformation and intrinsic configuration, and also in terms of  the order-to-chaos transition undertaken by the atomic nucleus at increasing temperature.

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The scope of the working group on Nuclear Electro-magnetic Moments concerns the study of static and transition nuclear moments by gamma spectroscopic tools. This includes in particular the measurement of short-living excited states (mostly 2+) with the transient-field method and the newly revived recoil-in-vacuum technique. Furthermore perturbed angular correlation (PAC) measurements on low-energy beams will allow the extension of these studies in the 100 ps to 10 ns range of life times. Using the spin-orientation obtained in transfer reactions with post-accelerated beams one can go to longer-living states up to the microsecond range applying e.g. time-dependent perturbed angular distribution (TDPAD) method. The measurement of transitional moments will be discussed with special focus on Doppler-shift (plunger) and fast-timing techniques as well as Coulomb excitation of low-energy post-accelerated beams. Special focus will be given to the transfer of techniques used with stable beam to radioactive beams.