0000000000400419
AUTHOR
Xuan Wang
Search for a 2-quasiparticle high-Kisomer inRf256
The energies of 2-quasiparticle (2-qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in {sup 256}Rf, which suggest that a long-lived, low-energy 8{sup -} isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a {sup 256}Rf nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5)-{mu}s isomer was identified. However, its low population, {approx}5(2)% that of the ground state instead of the expected {a…
Kπ=8−isomers andKπ=2−octupole vibrations inN=150shell-stabilized isotones
Isomers have been populated in {sup 246}Cm and {sup 252}No with quantum numbers K{sup {pi}}=8{sup -}, which decay through K{sup {pi}}=2{sup -} rotational bands built on octupole vibrational states. For N=150 isotones with (even) atomic number Z=94-102, the K{sup {pi}}=8{sup -} and 2{sup -} states have remarkably stable energies, indicating neutron excitations. An exception is a singular minimum in the 2{sup -} energy at Z=98, due to the additional role of proton configurations. The nearly constant energies, in isotones spanning an 18% increase in Coulomb energy near the Coulomb limit, provide a test for theory. The two-quasiparticle K{sup {pi}}=8{sup -} energies are described with single-pa…
Precursor-Controlled Formation of Novel Carbon/Metal and Carbon/Metal Oxide Nanocomposites
Carbonaceous materials have long been considered as a high-performance material due to their light weight, high thermal resistance, tunable porosity and strength, but also because of their exciting electronic properties. When hybridized with other metal nanoparticles to form carbon/ metal nanocomposites (CMCs), multifunctionality is achieved through the combination of carbon and metal, leading to interesting magnetic materials, catalysts, battery electrodes, or chemical sensors. Various methods for preparing CMCs have been developed. In most cases, metal cations deposited on carbonaceous materials were reduced chemically or physically to form CMCs. In these processes, heterogeneous dispersi…