No abstract

Precise mass measurements of the neutron-rich 125−130 In isotopes have been performed with the TITAN Penning trap mass spectrometer. TITAN's electron beam ion trap was used to charge breed the ions to charge state q = 13+ thus providing the necessary resolving power to measure not only the ground states but also isomeric states at each mass number. In this paper, the properties of the ground states are investigated through a series of mass differentials, highlighting trends in the indium isotopic chain as compared to its proton-magic neighbor, tin (Z = 50). In addition, the energies of the indium isomers are presented. The (8 −) level in 128 In is found to be 78 keV lower than previously thought and the (21/2 −) isomer in 127 In is shown to be lower than the literature value by more than 150 keV.

High-precision Q EC -value measurement of the superallowed β + emitter 22 Mg and an ab-initio evaluation of the A = 22 isobaric triplet

Abstract. We present the results of experiments using a 6 He beam on a 9 Be target at energies 7 − 9 times the Coulomb barrier. Angular distributions of the elastic, inelastic scattering (target breakup) and the α-particle production in the 6 He+ 9 Be collision have been analysed. Total reaction cross sections were obtained from the elastic scattering analyses and a considerable enhancement has been observed by comparing to stable systems.

We present the results of precision mass measurements of neutron-rich cadmium isotopes. These nuclei approach the N = 82 closed neutron shell and are important to nuclear structure as they lie near doubly-magic 132 Sn on the chart of nuclides. Of particular note is the clear identification of the ground state mass in 127 Cd along with the isomeric state. We show that the ground state identified in a previous mass measurement which dominates the mass value in the Atomic Mass Evaluation is an isomeric state. In addition to 127/m Cd, we present other cadmium masses measured ( 125/m Cd and 126 Cd) in a recent TITAN experiment at TRIUMF. Finally, we compare our measurements to new ab initio shell-model calculations and comment on the state of the field in the N = 82 region.

We performed the first direct mass measurements of neutron-rich vanadium 52−55 V isotopes passing the N = 32 neutron shell closure with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The new direct measurements confirm all previous indirect results. Through a reduced uncertainty of the mass of 55 V we confirm the quenching of the N = 32 neutron shell closure in vanadium. We discuss the evolution of the N = 32 neutron shell closure between K and Cr and show similar signatures in the half-life surface when studied along the isotopic chains.