A High-Resolution Study of the 110Tc → 110Ru → 110Rh → 110Pd Decay Chain with the GRETINA Array

Spectroscopic data, such as precise γ-ray branching and E2/M1 multipole-mixing ratios, provide vital constraints when performing multi-dimensional Coulomb-excitation analyses. Consequently, as part of our new Coulomb-excitation campaign aimed at investigating the role of exotic non-axial (triaxial) deformations in the unstable refractory Ru-Mo isotopes, additional beta-decay data was obtained. These measurements make use of ANL's CARIBU facility, which provides intense beams of radioactive refractory isotopes along with the excellent efficiency and angular resolution of the GRETINA γ-ray tracking array. In this article, we report on the analysis of the A = 110 decay chain, focussing on the identification of previously unreported states in 110Ru following the decay of 110Tc

Triaxiality near the 110Ru ground state from Coulomb excitation

A multi-step Coulomb excitation measurement with the GRETINA and CHICO2 detector arrays was carried out with a 430-MeV beam of the neutron-rich 110Ru (t1/2=12 s) isotope produced at the CARIBU facility. This represents the first successful measurement following the post-acceleration of an unstable isotope of a refractory element. The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations

The Radiopharmaceuticals Production and Research Centre established by the Heavy Ion Laboratory of the University of Warsaw

The Radiopharmaceuticals Production and Research Centre was recently installed on the premises of the Heavy Ion Laboratory, University of Warsaw. Equipped with a medical PETtrace p/d cyclotron , radiochemistry synthesis and dispensing units and a modern quality control laboratory the Centre is intended to produce regularly for commercial purposes the classic PET radiopharmaceuticals ( such -as e.g. FDG- ). Situated on the largest Warsaw scientific campus OCHOTA, an important part of the Centre’s activities will also be devoted to the production of known species for preclinical studies and research into innovative radiopharmaceuticals in collaboration with other scientific units of this Campus as well as with members of the Warsaw Consortium for PET Collaboration. Research into the accelerator production route of 99mTc will also begin shortly

Experimental evidence on the ground-state energy of 229^{229}Pa

The E1 transition from the 3/2$^-$ state to the ground state of $^{229}$Pa was identified in the (p,t$\gamma$) reaction. Its energy is found to be 11.6(3) keV. This leads to a value of Q_{\makebox{g.s.}} = -4133(2) keV and to a mass defect of $^{229}$Pa of 29 894(3) keV. It is concluded that the ground-state configuration of $^{229}$Pa is 3/2[651]

Coulomb excitation of neutron-rich 44^{44}Ar at SPIRAL

Expérience GANILInternational audienceThe weakening of the N = 28 shell closure and the development of deformation and shape coexistence were addressed in a low-energy Coulomb excitation experiment using a radioactive 44Ar beam from SPIRAL. The 2+ 1 and one higher-lying state in 44Ar were excited on 208Pb and 109Ag targets at two different beam energies. From the collected data it will be possible to extract the B(E2) values between all observed states and to determine the quadrupole moment of the first 2+ state, providing information on the prolate or oblate character of the deformation

Lifetime of the recently identified 10+^+ isomeric state at 3279 keV in the 136^{136}Nd nucleus

International audienceBackground: The γ softness of Nd136 makes it possible to study the shape changes induced by two-proton or two-neutron excitation. Purpose: We measure the lifetimes of two-quasiparticle states of the bands based on the 10+ states at 3296 and 3279 keV to investigate the shape change induced by the alignment of two protons or two neutrons in the h11/2 orbital. Methods: The recoil-distance Doppler shift method was used for the study of Nd136 studies, which was formed by the fusion reaction Sn120(Ne20,4n)Nd136, at Ebeam=85 MeV. Calculations were performed within the microscopic-macroscopic approach, based on the deformed Woods-Saxon single-particle potential and the Yukawa-plus-exponential macroscopic energy. Results: The lifetime of the 10+ state at 3279 keV of Nd136 was measured to be T1/210+=1.63(9) ns. The lifetimes of the 2+ state at 374 keV and of the 12+ state at 3686 keV of the ground band were also measured to be T1/22+=26.5(14) ps and T1/212+=22.5(14) ps. Conclusions: The measured lifetime of 10+ the state at 3279 keV together with other observables confirm the structure change in Nd136. A rather small reduced hindrance of the electromagnetic decay of the 10+ state at 3279 keV would be consistent with its K-mixed character