[en] The β decay data of ^32,33Ar, recently revisited at the low energy line of SPIRAL at GANIL, is used to illustrate the structure information we can get from βp precusors when a highly performing setup is used.

[en] The ISOLDE facility at CERN has as objective the production, study and research of nuclei far from stability. The facility provides low energy radioactive beams and post-accelerated beams. In the last 45 years the ISOLDE facility has gathered unique expertise in research with radioactive beams. Over 700 isotopes of more than 70 elements have been used in a wide range of research domains, including cutting edge studies in nuclear structure, atomic physics, nuclear astrophysics, and fundamental interactions. These nuclear probes are also used to do frontier research in solid state and life sciences. There is an on-going upgrade of the facility, the HIE-ISOLDE project, which aims to improve the ISOLDE capabilities in a wide front, from an energy increase of the post-accelerated beam to improvements in beam quality and beam purity. The first phase of HIE-ISOLDE will start for physics in the autumn of 2015 with an upgrade of energy for all post-accelerated ISOLDE beams up to 5.5 MeV/u. In this contribution the most recent highlights of the facility are presented

[en] The on-line isotope mass separator ISOLDE is the radioactive beam facility of CERN. Its objective is the production and research of nuclei far from stability. Exotic nuclei of most chemical elements are available for the study of nuclear structure, nuclear astrophysics, fundamental symmetries and atomic physics, and for applications in condensed-matter and life sciences. A description of the facility, some recent results and future plans are presented here

[en] A phoswich configuration consists of LaBr₃(Ce) and LaCl₃(Ce) crystals optically coupled and stacked together with a common readout. Each crystal has different decay time response and different light yield which make possible the design of a high efficient gamma radiation and proton endcap detector, as a continuation of the CALIFA barrel.

[en] The β-decay process allows one to understand better the interactions and behaviour of the nucleons inside the nucleus. The study of nuclei at the limits of stability has recently become a central focus of nuclear structure research. The main characteristic of β-decay far from stability is the large number of decay channels open. The decay process is well understood and the interpretation of the data yields a wide variety of spectroscopic information: level energies, spins, parities, widths and level densities. In this brief paper, a summary of the progress achieved over the last few decades in the study and identification of β-delayed particle precursors is given with special emphasis on the achievements in studies of β-delayed charged particles where the detection system allowed for refined spectroscopy studies. For instance, detailed studies have been conducted on many β-delayed proton precursors of the sd shell. The comparison with the best performing shell-model calculations shows that although overall agreement is obtained in B_GT distributions, the density of the observed states is higher than predicted. This points to the need to include higher order configurations in the present sd shell calculations. The extension to heavier systems is desirable. The main challenges for the present and the next decade in this domain are outlined. (paper)

[en] An innovative solution for the forward end-cap CALIFA calorimeter of R³B is under investigation consisting of two scintillation crystals, LaBr₃ and LaCl₃, stacked together in a phoswich configuration with one readout only. This dispositive should be capable of a good determination of the energy of protons and gamma radiation. This composite detector allows to deduce the initial energy of charged particles by ΔE1+ΔE2 identification. For gammas, the simulations show that there is a high probability that the first interaction occurs inside the scintillator at few centimeters, with a second layer, the rest of the energy is absorbed, or it can be used as veto event in case of no deposition in the first layer. One such a detector has been tested at the Centro de MicroAnalisis de Materiales (CMAM) in Madrid. Good resolution and time signal separation have been achieved.

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[en] In the experiment performed at GANIL (France) we have studied the β-delayed particle emission of the T_z = -3/2 ³³Ar and T_z = -2 ³²Ar proton emitters. Protons are emitted within the wide window (around 10 MeV) of excited states in ³³Cl and ³²Cl feeding the ground and the excited states of ³²S and ³¹S. Proton-γ coincidences have been used to determine the B(GT) strength in this region of excitation energy allowing us to reassign proton transitions to higher excited state with respect previous studies. The main motivation to revisit these nuclei is the increase of granularity and sensitivity of the charged particle detectors and the high sensitivity and large angular coverage obtained by the use of the CLOVER detectors.

[en] The aim of this work is to revisit the decay of Argon ³²Ar with special emphasis in the p-γ coincidences. The study was motivated by the increase in granularity and sensitivity of the charged particle detectors and by the high sensitivity and large angular coverage obtained by the use of CLOVER detectors