[en] The vortex photon beam induced nuclear reaction is studied. The interaction formalism of nuclei with vortex photons is developed and incorporated into the statistical reaction model to calculate reaction cross-sections. For 138 nuclei of high nuclear astrophysics and structure interest, the cross-sections of γ-ray emission and neutron production from the decay of the giant resonances (GR) populated by vortex photons are computed. It is shown that for these calculated crosssections, the GR contribution of an individual L is either enhanced or suppressed depending on the parameters of vortex γ-rays, and the contribution from the GR of a specific L can be identified and deduced. To this end, a novel method to exclusively determine the γ-strength function (γSF) for the GR of a specific L is proposed considering the measurements of the emitted γ and neutron, and the feasibility studies demonstrate that the γSF for the giant quadrupole resonance can be extracted. Furthermore, the astrophysical reaction rates of the vortex photon induced reactions in p-process are investigated. It is indicated that photo-nuclear reactions induced by vortex photons will bring new insights in nuclear physics and astrophysics research.

[en] An important aspect to understand collective excitations in atomic nuclei is through measurements of their magnetic dipole and electric quadrupole moments. While nuclear magnetic moments are sensitive to the orbits occupied by the valence particles, the electric quadrupole moments prove the deformation and the collective behavior of nuclei at both low and high excitation energy. Both, the nuclear gyromagnetic factor and the electric quadrupole moment can be compared to theory and thus play important role to establish changes in nuclear shell structure far away from stability. Recent results from experiments aiming at measurements of electromagnetic moments of exotic nuclei will be reported. The following experiments will be discussed: Transient field measurement of the g factor of the first 2"+ state in "7"2Zn, which were measured at GANIL at intermediate energies, will be presented, and the experimental technique will be discussed; First measurement of a isomeric electric quadrupole moment in "6"6Cu in transfer reaction will be presented and the perspectives to utilize this technique with post-accelerated ISOL beams in inverse kinematics will be discussed; A method for polarizing of post-accelerated ISOL beams, which is under development at ISOLDE, will be presented. (author)

No abstract available

[en] An overview of the main directions of present-day studies with γ quasimonochromatic beams are discussed with an emphasis on the research opportunities which will be offered at the Extreme Light Infrastructure Nuclear Physics (ELI-NP) facility at Magurele near Bucharest in Romania. Experiments with γ beams at the extremes of high temperature and high neutron-to-proton ratios are outlined. Some of the experimental setups for nuclear structure, reaction and astrophysics studies, which are available at ELI-NP, are described. Perspectives for studies of exotic nuclei within the Gamma Factory experiment at CERN are discussed. The expected fission-fragment yields at the Gamma Factory are presented. The perspectives for nuclear structure studies with γ rays with orbital angular momentum are outlined. Key Words: active-target experiments, ion trapping, ion transport, multidetector arrays, nuclear astrophysics, nuclear structure, photonuclear reactions, photofission, quasimonochromatic γ beams, twisted photons. (author)

[en] High-spin states in the doubly odd N=75 nuclei ¹³⁶Pm and ¹³⁸Eu were populated following the ¹¹⁶Sn(²⁴Mg,p3n) and ¹⁰⁶Cd(³⁵Cl,2pn) reactions, respectively. A new ΔI=1 band is reported in ¹³⁸Eu and new data are presented for the recently reported band in ¹³⁶Pm. Polarization and angular correlation measurements have been performed to establish the relative spin and parity assignments for these bands. Both bands have been assigned the same πh_11/2(direct product)νh_11/2 structure as the yrast band and are suggested as candidates for chiral twin bands

[en] The chiral-twin candidate bands recently observed in ¹³⁶Pm have been extended to high spins [I=(21)] using the Gammasphere γ-ray spectrometer and the Microball charged-particle detector array. A more-detailed spectroscopy of the bands was possible, where the rotational alignments and B(M1)/B(E2) ratios confirm that both sequences have the πh_11/2νh_11/2 configuration. Particle-rotor calculations of intraband and interband transition strength ratios of the chiral-twin bands are compared with experimental values for the first time. Good agreement was found between the predicted transition strength ratios and the experimental values, thus supporting the possible chiral nature of the πh_11/2νh_11/2 configuration in ¹³⁶Pm

[en] We report a new experimental results about candidates for chiral-twin bands in the mass A ∼ 190 region for the doubly-odd "1"8"6","1"8"8Ir nuclei. In this region the odd neutron is at the top of the νi_1_3_/_2 subshell, while the valence proton tends to occupy the Ω = 1/2 states of the πh_9_/_2 subshell or the (πi_1_3_/_2). A prolate-oblate shape transition has been observed in this region, and as a result triaxial shapes might be expected for some of the Ir nuclei. A stable triaxial shape is prerequisite for existence of chiral rotation. The experiments were performed at the WNSL of Yale University using of the YRAST Ball spectrometer.

[en] The brilliant gamma beam at the future Extreme Light Infrastructure - Nuclear Physics (ELI-NP) facility will be used to generate a beam of exotic neutron-rich isotopes via photofission of actinide targets. We present simulations with the Geant4 toolkit of the photofission process for the design and optimization of the expected performance parameters of the Cryogenic Stopping Cell (CSC). The CSC will be used to extract the photofission fragments into the secondary beam of about 10"6 ions/s. We propose an experimental program to study refractory neutron-rich isotopes

[en] We report a g-factor measurement of the 19/2+ T_1_/_2 = 4.5(3) μs isomer in "1"2"7Sn, which was carried out within the g-RISING project at GSI, Darmstadt, Germany, utilizing the time-differential perturbed angular distribution method. Isomers in A ≈ 130 nuclei were populated in relativistic projectile fragmentation of a "1"3"6Xe beam at E/A = 600 MeV on a 1024 mg/cm"2 Be production target. Fully-stripped ions were separated with the fragment separator, which allowed the preservation of the orientation of the nuclear spin ensemble as obtained in the reaction. The ions were implanted in a Copper plate, which provided a perturbation-free environment for the isomeric γ decay. The nuclei of interest were tracked and identified on an event-by-event basis and ion-γ coincidences were recorded.

[en] Magnetic moment measurements of isomeric states in neutron-rich isotopes populated in photofission using γ-beam facility at the Extreme Light Infrastructure−Nuclear Physics (ELI-NP) laboratory aim at addressing many open questions related to the structure of the nuclei in A around 100 and 130 mass regions. The possibility of such measurements at ELI-NP is briefly discussed here using Geant4 Monte Carlo simulations. The present paper report the estimates of γ-beam profile at the target, fission fragment production rates and the possible target geometry.