[en] The Triaxial Projected Shell Model (TPSM) provides a unified microscopic description of rotational and multi-phonon vibrational states. We applied the TPSM model with its new capability to calculate B(E2) [1] values in the rare-earth region. The energies of the double-phonon states are reproduced. The calculated B(E2) values agree within an order of magnitude with the experimental ones. The calculations point to the identification of the new K=4+ band in 162Dy as a possible γγ-band

[en] Two main mechanisms are predicted to drive the possible shell evolution phenomena: the first is the so called monopole migration [1], which acts for both proton and neutron-rich nuclei, and the second, shell quenching, which is due to a softening of the potential shape that results from the presence of an excessive number of neutrons in very neutron-rich nuclei [2]. These mechanisms modify the known magic numbers as a consequence of shifting effective single-particle levels when going towards either the proton or the neutron drip lines. In medium-heavy nuclei the effort to establish shell evolution concentrates around the 1^00Sn [3] and 1^32Sn [4,5] doubly magic nuclei. The Sn isotopes form the longest isotopic chain in the nuclear chart accessible to current experimental study and thus provide a stringent testing ground for nuclear structure models. A remarkable similarity was found between the decay of 8⁺ isomers in 9^8Cd₅₀ [6] and 1^30Cd₈₂ [5], both of which have a pure g_9/2^-2 proton-hole configuration. However, the analogue of the known core excited isomer in 9^8Cd [7] was not observed in 1^30Cd, within experimental sensitivity, thus underlining the differences in the underlying neutron single-particle structure. The understanding of analogies in the structure of both regions of nuclei and the evolution of the N=82 shell gap below 1^32Sn is of importance in predicting the path of the rapid-neutron capture process which partially drives the production of elements heavier than Fe in nature. A handful of additional information on these two regions of nuclei was obtained recently in spectroscopy studies within the Rare ISotopes INvestigation at GSI (RISING) project [8,9] including the rp-process waiting point nuclei. Selected results will be discussed and compared with large scale shell model calculations using various sets of the realistic residual two-body interaction.(author)

[en] This contribution deals with the topic of slow extraction spill quality characterization based on the measurements performed at GSI SIS-18. The sensitivity of the spill to power supply ripples are studied by introducing external ripples. An estimate of sources of inherent power supply ripples along with ripple magnitude are thus obtained. Spill characterization in time and frequency domain are discussed and exemplified by a typical spill and the differences from an ideal or Poisson spill. An appropriate spill characterization aims to provide a suitable abstraction for communication about the spill quality requirements between accelerator operations and users. (paper)

[en] The feasibility studies of the slowed down beam setup involving deceleration of a ⁶⁴Ni beam at 250 MeV/u to 13 MeV/u in a thick Al degrader was performed at the FRagment Separator (FRS) at GSI. The experimentally measured energy spread and the nuclear reaction yields in the degrader are in good agreement with simulations. (authors)

No abstract available

[en] The study of neutron rich nuclei is currently one of the most active research l ds in nuclear physics. These nuclei contain an excess of neutrons when compared with stable nuclei, that feature leads to new phenomena such as the re-arrangement of nuclear shells which consequently causes deformations of the nuclear shape. In the last decades, neutron- rich nuclei with around 38 protons have gained attention due to the behavior of their shape deformation as a function of the number of neutrons. A remarkable case is exhibited by the Zirconium isotones, where the deformation of the nuclear shape changes from a low deformed structure for the 96Zr, to a highly prolate deformation as in the case of 104Zr. Nevertheless, a full study is far from being completed. The production of these isotopes, with statistics high enough to allow for a good performance of gamma spectroscopy, is a challenge only recently tackled thanks to improvements to the latest experimental facilities. At the LNL laboratory in Legnaro, Italy, neutron-rich nuclei in the Z ∼38 region were populated by the sion reaction of a 136Xe projectile colliding against a 233U target, at a beam energy of 1 GeV. In order to detect the nuclear species produced and the gamma rays associated with them, the modern AGATA-PRISMA setup was used. In this work, the partial analysis of the data for this experiment will be shown; in particular, the mass production of Zirconium and Strontium isotopes. Also, the yield of production of the reaction is estimated, allowing to obtain a criteria for its suitability with regards to populating these neutron-rich nuclei of interest

[en] The structure of the unbound proton-rich isotope ¹⁹Na was studied in resonance elastic scattering of a radioactive ¹⁸Ne beam on a proton target using the thick-target inverse-kinematics method. The experiment covered the excitation energy range from 0.5 to 2.7 MeV in c.m.s. Only one state of ¹⁹Na (the second excited state) was observed. A combined R-matrix and potential model analysis was performed. The spin and parity assignment of this second excited state was confirmed to be 1/2⁺. We show that the position of the 1/2⁺ state significantly affects the reaction rate through that state, but the total reaction rate remains unchanged since the ¹⁸Ne(2p, γ) proceeds mostly via the ground and first excited states in ¹⁹Na at stellar temperatures

[en] Full text: This presentation will discuss new results obtained from experiments designed to investigate the decay properties of isomeric states in N ≅ Z nuclei. Specifically new decay properties of the known 16⁺ spin-gap isomer in ⁹⁶Cd will be presented along with data which suggest the presence of isomeric gamma decaying states in this nucleus and the first, preliminary, results for the identification of a low-K, 2-quasi-particle, isomer in ⁷⁰Se. In both cases the experiments were performed at the Radioactive Isotope Beam Factory (RIBF) at RIKEN as part of EURICA campaigns. The nuclei of interest were produced by the fragmentation of a 345 MeV/nucleon ¹²⁴Xe primary beam colliding with a ⁹Be target and the isotopes of interest were identified using the BigRIPS spectrometer. The first evidence for β-delayed proton decay from the 16⁺ isomer in ⁹⁶Cd will be presented. The beta delayed proton branching ratio has been measured, along with upper and lower limits for the B(GT) strength of the decay from the 16⁺ isomer to the 15⁺ isomer in ⁹⁶Ag and decays to the predicted ‘resonance-like’ states, respectively. The experimental β-delayed proton observations reveal some discrepancies with large scale shell-model calculations for ⁹⁶Ag using the sdg model space, which necessitates further theoretical investigation. New isomer data in ⁹⁶Cd will be discussed. For ⁷⁰Se, preliminary results will be presented showing evidence for a high energy isomeric gamma transition, which is associated with the decay of a level with a mean-lifetime of 750 ns. The result can be understood, with the aid of projected shell model calculations, to arise from the decay of a low-K 2-quasi-neutron structure. This is believed to be the first observation of a K-isomer in this region, despite long standing predictions for the existence of high-K isomers in N = Z nuclei. (author)

[en] There is a distinct possibility in this mass region of 100 for the occurrence of anti-magnetic bands. With this motivation, high spins states in nuclei with N ∼ 55, and Z ∼ 45, 46 (eg. ^100,101Pd, ⁹⁹Rh) were populated in the ⁷²Ge(³⁵Cl, xnyp) reaction at an incident beam energy of 135 MeV using the beams from the ATLAS accelerator. The coincidence gamma rays were detected with the GAMMASPHERE facility, which at the time of the experiment comprised 101 HPGe detectors. The master trigger was set for a three or higher fold coincidences. The events were stored on a magnetic tape and sorted offline into a E_γ - E_γ - E_γ cube for detailed offline analysis. For data analysis the RADWARE spectrum analysis package was used. Details are presented

No abstract available