Transfer reactions in inverse kinematics using the radioactive ion beams provided by the REX- ISOLDE facility at CERN are very good tools to gain insight into the single-particle properties of exotic nuclei. The new silicon particle detector setup T-REX, optimized for these transfer reactions, is presented in this article. T-REX consists of position sensitive ΔE-E telescopes in a compact configuration that covers up to 66% of the solid angle. The setup allows the identification of the light reaction products and the measurement of their angular distribution for a large range of polar angles. Simultaneous detection of the elastically scattered target-like nuclei enables the determination of the optical model parameters used in the analysis of the experiments.

A new setup for transfer experiments at REX-ISOLDE

Axial and triaxial degrees of freedom in 72Zn

Coulomb excitation of Kr80,82 and a change in structure approaching N=Z=40

An ionization chamber for recording nuclear radiations free of background radiations is described. The chamber consists of a compensating and a sensitive part, high-voltage electrodes and a collecting electrode. Tbe size of the chamber is reduced and the adjustment simplified by hermetically separating the compensating part from the sensitive part. (TCO)

An ionization chamber

Transfer reactions are a unique tool to populate and probe the structure of nuclei. Due to its unprecedented capabilities in producing and accelerating exotic nuclei, the HIE-ISOLDE facility at CERN provides an excellent opportunity for transfer experiments using radioactive ion beams. We present the concept, layout and prototype measurements with the newly developed HI-TREX particle detection setup, optimized for an efficacious investigation of transfer reactions. A special focus is put on the electronics developments utilizing the custom made, FPGA based GEAR platform for reading the data from the SKIROC2 ASICs. We present performance measurements of the readout and show results from a heavy-ion beam experiment at the Munich tandem accelerator facility MLL.

HI-TREX—A highly integrated transfer setup at REX-(HIE)ISOLDE

In this work, the N = 40 subshell closure is investigated with two complementary methods using a radioactive 72 Zn ISOLDE beam: One- and two-neutron transfer reactions and multiple Coulomb excitation. In the one-neutron transfer reaction, two new levels of 73 Zn were discovered. The two-neutron transfer channel allowed to study the differential cross section of the ground state and the 2 + 1 state of 74 Zn. In the Coulomb excitation experiment, the measured B(E2) values and quadrupole moments of 72 Zn showed that the yrast states 0 + 1 , 2 + 1 and 4 + 1 are moderately collective. Contrary, the 0 + 2 state has a different structure, since it features a stronger closed N=40 configuration compared to the ground state.

Probing Nuclear Shell Structure beyond the N = 40 Subshell using Multiple Coulomb Excitation and Transfer Experiments

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Probing Nuclear Shell Structure beyond the N = 40 Subshell using Multiple Coulomb Excitation and Transfer Experiments

Axial and triaxial degrees of freedom in 72Zn