First Results with the early implementation of AGATA


Andres Gadea


CSIC-University of Valencia, Spain


The first implementation of the AGATA [1,2] spectrometer consisting of five triple germanium detector clusters has recently completed the experimental campaign at Laboratori Nazionali di Legnaro, INFN.  This setup had two major goals, the first one was to validate the γ-tracking concept and the second is to perform an experimental physics program using the stable beams delivered by the Tandem PIAVE-ALPI accelerator complex.  The AGATA setup was designed to be coupled with the large-acceptance magnetic spectrometer PRISMA [3]. Therefore, the in-beam prompt γ-rays detected with AGATA will be measured in coincidence with the products of grazing reactions measured by PRISMA.  The study of neutron-rich nuclei is one of the most challenging problems in nuclear structure.  Among the open questions is of special interest the evolution of the nuclear effective interactions, in particular of the monopole term, due to the tensor interaction, with consequences in the quenching of the known shell gaps and development of new ones.  Also the evolution of the nuclear collectivity towards nuclei with large neutron excess is a consequence of the modification of the Single Particle Energies and the evolution of shell gaps.  The aforementioned questions can be studied in moderately neutron-rich nuclei populated in multinucleon-transfer reactions and deep-inelastic collisions.  In this contribution we will briefly describe the capabilities of the setup as well as several results obtained during the campaign, including the ones in the vicinity of 78Ni and in the vicinity of N=40 in the middle of the f7/2 shell.  A novel lifetime RDDS technique developed in collaboration with IKP Cologne  as well as preliminary results in the mentioned regions will be also discussed.  During 2012 the AGATA sub-array will start the experimental campaign at Fragment Separator (FRS) PRESPEC setup of the GSI Darmstadt.  A brief introduction to the capabilities of this new setup will be presented.


[1] A. Gadea et al., Nucl. Instr. Meth. Phys. Res. A 654, 88 (2011).

[2] S. Akkoyun et al., Nucl. Instr. Meth. Phys. Res. A 668, 26 (2012).

[3] A. M. Stefanini et al., Nucl. Phys. A701, 109c (2002); A. Latina et al., Nucl. Phys. A734, E1 (2004).