Category: Science
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Issues in Computer Science
Computer science, like any field, faces various challenges and issues that researchers, professionals, and society must address. Some of the significant issues in computer science include: Privacy and Security: With the increasing digitization of information and the pervasive use of technology, protecting data privacy and ensuring cybersecurity have become critical concerns. Cyberattacks, data breaches, and…
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Decay modes of 250 No
D. Peterson, B. B. Back, R. V. F. Janssens, T. L. Khoo, C. J. Lister, D. Seweryniak, I. Ahmad, M. P. Carpenter, C. N. Davids, A. A. Hecht, C. L. Jiang, T. Lauritsen, X. Wang, S. Zhu, F. G. Kondev, A. Heinz, J. Qian, R. Winkler, P. Chowdhury, S. K. Tandel, and U. S. Tandel…
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Microscopic description of fission in nobelium isotopes with the Gogny-D1M energy density functional
R. Rodriguez-Guzman, L.M. Robledo Constrained mean-field calculations, based on the Gogny-D1M energy density functional, have been carried out to describe fission in the isotopes 250−260No. The even-even isotopes have been considered within the standard Hartree-Fock-Bogoliobov (HFB) framework while for the odd-mass ones the Equal Filling Approximation (HFB-EFA) has been employed. Ground state quantum numbers and deformations,…
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Actinide chemistry using singlet-paired coupled cluster and its combinations with density functionals
Alejandro J. Garza, Ana G. Sousa Alencar, Gustavo E. Scuseria Singlet-paired coupled cluster doubles (CCD0) is a simplification of CCD that relinquishes a fraction of dynamic correlation in order to be able to describe static correlation. Combinations of CCD0 with density functionals that recover specifically the dynamic correlation missing in the former have also been…
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γ-vibrational states in superheavy nuclei
Yang Sun, Gui-Lu Long, Falih Al-Khudair, and Javid A. Sheikh Recent experimental advances have made it possible to study excited structure in superheavy nuclei. The observed states have often been interpreted as quasiparticle excitations. We show that in superheavy nuclei collective vibrations systematically appear as low-energy excitation modes. By using the microscopic Triaxial Projected Shell…
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Rotational properties of nuclei around 254No investigated using a spectroscopic-quality Skyrme energy density functional
Yue Shi, J. Dobaczewski, P.T. Greenlees Nuclei in the Z≈100 mass region represent the heaviest systems where detailed spectroscopic information is experimentally available. Although microscopic-macroscopic and self-consistent models have achieved great success in describing the data in this mass region, a fully satisfying precise theoretical description is still missing. By using fine-tuned parametrizations of the energy density…
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Deformations and quasiparticle spectra of nuclei in the nobelium region
Yue Shi, J. Dobaczewski, P.T. Greenlees, J. Toivanen, P. Toivanen We have performed self-consistent Skyrme Hartree-Fock-Bogolyubov calculations for nuclei close to 254No. Self-consistent deformations, including β2,4,6,8 as functions of the rotational frequency, were determined for even-even nuclei 246,248,250Fm, 252,254No, and 256Rf. The quasiparticle spectra for N=151 isotones and Z=99 isotopes were calculated and compared with experimental data and the results of…
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Skyrme mean-field study of rotational bands in transfermium isotopes
M. Bender, P. Bonche, T. Duguet, P.-H. Heenen Self-consistent mean field calculations with the SLy4 interaction and a density-dependent pairing force are presented for nuclei in the Nobelium mass region. Predicted quasi-particle spectra are compared with experiment for the heaviest known odd N and odd Z nuclei. Spectra and rotational bands are presented for nuclei…
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Properties of nuclei in the nobelium region studied within the covariant, Skyrme, and Gogny energy density functionals
J. Dobaczewski, A.V. Afanasjev, M. Bender, L.M. Robledo, Yue Shi We calculate properties of the ground and excited states of nuclei in the nobelium region for proton and neutron numbers of 92 <= Z <= 104 and 144 <= N <= 156, respectively. We use three different energy-density-functional (EDF) approaches, based on covariant, Skyrme, and…
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Direct mapping of nuclear shell effects in the heaviest elements
E. Minaya Ramirez, D. Ackermann, K. Blaum, M. Block, C. Droese, Ch. E. Düllmann, M. Dworschak, M. Eibach, S. Eliseev, E. Haettner, F. Herfurth, F.P. Heßberger, S. Hofmann, J. Ketelaer, G. Marx, M. Mazzocco, D. Nesterenko, Yu.N. Novikov, W.R. Plaß, D. Rodríguez, C. Scheidenberger, L. Schweikhard, P.G. Thirolf, C. Weber Quantum-mechanical shell effects are expected…