Japan Atomic Energy Research Institute

About: Japan Atomic Energy Research Institute is a based out in . It is known for research contribution in the topics: Neutron & Irradiation. The organization has 7707 authors who have published 14471 publications receiving 207688 citations.

A semiempirical formula for the energy dependence of the sputtering yield

Abstract: We have derived a simple empirical formula for sputtering yields of monatomic metals and semiconductors, taking the threshold effect for knock-on of atoms into account in the Sigmund theory. It is found that this semi-empirical formula fits to the energy dependence of the sputtering yields over a wide range of ion-target combinations. The best fit values of the parameters for the formula are given as a function of the ratio of the mass of target atoms and the mass of incident ions.

Fermi-Gas Model Parametrization of Nuclear Level Density.

Abstract: The authors furnish a new parametrization of the Fermi-Gas model description of nuclear level densities at excitation energies corresponding to the neutron binding energy. The model adopted is the standard Fermi-Gas model with pairing and shell-effect corrections. Particular care has been devoted to the inclusion of shell effects and to their parametrization. The procedure for the evaluation of level density parameters has been applied to a data-base of 217 nuclei covering a mass range 41 ≤ A ≤ 253. A global systematics parametrization has been derived which allows for a derivation of level density parameters for nuclei where experimental information is not available.

Pressure-induced anomalous magnetism and unconventional superconductivity in CeRhIn 5 : 115 In -NQR study under pressure

Abstract: We report ${}^{115}\mathrm{In}$ nuclear-quadrupole-resonance (NQR) measurements of the pressure $(P)$-induced superconductor ${\mathrm{CeRhIn}}_{5}$ in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field ${H}_{\mathrm{int}}$ at the In site is substantially reduced from ${H}_{\mathrm{int}}=1.75\mathrm{kOe}$ at $P=0$ to 0.39 kOe at $P=1.23\mathrm{GPa},$ while the N\'eel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment ${M}_{Q}(P)$ or the angle $\ensuremath{\theta}(P)$ between the direction of ${M}_{Q}(P)$ and the tetragonal c axis is extrapolated to zero at ${P}^{*}=1.6\ifmmode\pm\else\textpm\fi{}0.1\mathrm{GPa}$ at which a bulk SC transition is no longer emergent. In the SC state at $P=2.1\mathrm{GPa},$ the nuclear spin-lattice relaxation rate ${}^{115}{(1/T}_{1})$ has revealed a ${T}^{3}$ dependence without the coherence peak just below ${T}_{c},$ giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed.