In-source laser spectroscopy of dysprosium isotopes at the ISOLDE-RILIS

Chrysalidis, K.*; Barzakh, A. E.*; Ahmed, R.*; Andreyev, A. N.; Ballof, J.*; Cubiss, J. G.*; Fedorov, D. V.*; Fedosseev, V. N.*; Fraile, L. M.*; Harding, R. D.*; et al.

Nuclear Instruments and Methods in Physics Research B, 463, p.472 - 475, 2020/01

https://doi.org/10.1016/j.nimb.2019.04.021

A number of radiogenically produced dysprosium isotopes have been studied by in-source laser spectroscopy at ISOLDE using the Resonance Ionization Laser Ion Source (RILIS). Isotope shifts were measured relative to Dy in the (gs) (418.8 nm )resonance transition. The electronic factor, , and mass shift factor, M, were extracted and used for determining the changes in mean-squared charge radii for Dy and Dy for the first time.

A Review of separation processes proposed for advanced fuel cycles based on technology readiness level assessments

Baron, P.*; Cornet, S. M.*; Collins, E. D.*; DeAngelis, G.*; Del Cul, G.*; Fedorov, Y.*; Glatz, J. P.*; Ignatiev, V.*; Inoue, Tadashi*; Khaperskaya, A.*; et al.

Progress in Nuclear Energy, 117, p.103091_1 - 103091_24, 2019/11

https://doi.org/10.1016/j.pnucene.2019.103091

The results of an international review of separation processes for spent nuclear fuel (SNF) recycling in future closed fuel cycles with the evaluation of Technology Readiness Level are reported. This study was made by the Expert Group on Fuel Recycling Chemistry (EGFRC) organised by the Nuclear Energy Agency (NEA) of the Organisation for Economic Co-operation and Development (OECD). A unique feature of this study was that processes were classified according to a hierarchy of separations aimed at different elements within spent fuel (uranium; uranium-plutonium co-recovery; minor actinides; high heat generating radionuclides) and also the Head-end processes, used to prepare the SNF for chemical separation, were included. Separation processes covered both wet (hydrometallurgical) and dry (pyro-chemical) processes.

Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in At revealed by in-source laser spectroscopy

Barzakh, A. E.*; Cubiss, J. G.*; Andreyev, A. N.; Seliverstov, M. D.*; Andel, B.*; Antalic, S.*; Ascher, P.*; Atanasov, D.*; Beck, D.*; Biero, J.*; et al.

Physical Review C, 99(5), p.054317_1 - 054317_9, 2019/05

https://doi.org/10.1103/PhysRevC.99.054317

Changes in mean-squared charge radii and magnetic moments of Tl measured by in-source laser spectroscopy

Barzakh, A.*; Andreyev, A. N.; Cocolios, T. E.*; de Groote, R. P.*; Fedorov, D. V.*; Fedosseev, V. N.*; Ferrer, R.*; Fink, D. A.*; Ghys, L.*; Huyse, M.*; et al.

Physical Review C, 95(1), p.014324_1 - 014324_12, 2017/01

https://doi.org/10.1103/PhysRevC.95.014324

Shapes of Pb ground states from -decay studies using the total-absorption technique

Estvez Aguado, M. E.*; Algora, A.*; Agramunt, J.*; Rubio, B.*; Tain, J. L.*; Jordn, D.*; Fraile, L. M.*; Gelletly, W.*; Frank, A.*; Csatls, M.*; et al.

Physical Review C, 92(4), p.044321_1 - 044321_8, 2015/10

https://doi.org/10.1103/PhysRevC.92.044321

-delayed fission of Tl

Elseviers, J.*; Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; et al.

Physical Review C, 88(4), p.044321_1 - 044321_13, 2013/10

https://doi.org/10.1103/PhysRevC.88.044321

-decay spectroscopy of the chain Tl Au Ir Re

Andreyev, A. N.*; Liberati, V.*; Antalic, S.*; Ackermann, D.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Diriken, J.*; Elseviers, J.*; Fedorov, D.*; et al.

Physical Review C, 87(5), p.054311_1 - 054311_8, 2013/05

https://doi.org/10.1103/PhysRevC.87.054311

Relative isomer abundance of fullerenes and carbon nanotubes correlates with kinetic stability

Fedorov, A. S.*; Fedorov, D. A.*; Kuzubov, A. A.*; Avramov, P.; Nishimura, Yoshifumi*; Irle, S.*; Witek, H. A.*

Physical Review Letters, 107(17), p.175506_1 - 175506_5, 2011/10

https://doi.org/10.1103/PhysRevLett.107.175506

Atomic and electronic structure of new hollow-based symmetric families of silicon nanoclusters

Avramov, P.; Fedorov, D. G.*; Sorokin, P. B.*; Chernozatonskii, L. A.*; Gordon, M. S.*

Journal of Physical Chemistry C, 111(51), p.18824 - 18830, 2007/12

https://doi.org/10.1021/jp0777216

We have systematically constructed a set of stable silicon nanocluster families with large arbitrary fullerenetype hollows inside. In addition, conglomerate structures are designed by connecting the nanoclusters through pentagonal and hexagonal junctions. The atomic and electronic structure of the proposed objects is investigated using the semiempirical quantum-mechanical method. It is shown that within each family the band gap and the stability are inversely proportional to the particle effective size. The clusters inherit a wide variety of structural and symmetry properties from their parent silicon fullerenes. The conglomerates confine electrons like quasi-molecules with a peculiar electronic structure related to the junctions. Quantum dots and their conglomerates can host guest atoms in their hollows and therefore present a new promising type of nanomaterials with tunable electronic properties.

Band-gap unification of partially Si-substituted single-wall carbon nanotubes

Avramov, P.; Sorokin, P. B.*; Fedorov, A. S.*; Fedorov, D. G.*; Maeda, Yoshihito

Physical Review B, 74(24), p.245417_1 - 245417_8, 2006/12

https://doi.org/10.1103/PhysRevB.74.245417

The atomic and electronic structure of a set of pristine single wall SiC nanotubes as well as Si-substituted carbon nanotubes and a SiC sheet was studied by the LDA plane wave band structure calculations. Consecutive substitution of carbon atoms by Si leads to a gap opening in the energetic spectrum of the metallic (8,8) SWCNT with approximately quadratic dependence of the band gap upon the Si concentration. The same substitution for the semiconductor (10,0) SWCNT results in a band gap minimum (0.27 eV) at 25% of Si concentration. In the Si concentration region of 12-18%, both types of nanotubes have less than 0.5 eV direct band gaps at the - point. The calculation of the chiral (8,2) SWSiCNT system gives a similar (0.6 eV) direct band gap. The regular distribution of Si atoms in the atomic lattice is by 0.1 eV/atom energetically preferable in comparison with a random distribution. Time dependent DFT calculations showed that the silicon substitution sufficiently increases (roughly by one order of magnitude) the total probability of optical transitions in the near infrared region, which is caused by the opening of the direct band gap in metallic SWCNTs, the unification of the nature and energy of band gaps of all SWCNT species, the large values of Si3Si3 radial integrals and participation of Si3 states in chemical bonding in both valence and conductance bands.