Magnetic shift of magic nuclei

Kondratyev, V. N.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.550 - 553, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0550.pdf

As we have recently proposed study magnetic fields can modify dramatically the nuclear structure leading, e.g., to a change of shell-correction components of binding energies and nuclear magic numbers. In this contribution we further demonstrate that the predominant mechanism of such a modification can be interpreted as a phase-shift in shell-oscillations originating from a field dependent interference of contributions coming from majority- and minority-spin energy levels. Nuclear magic numbers corresponding to the vicinity of the stability line depend on the magnetic field and are changed considerably at the strength scale G relevant, e.g., for supernovas and neutron stars. At such a field strength the magic nuclei of the iron region are shifted towards smaller mass numbers.

Statistics of magnetic noise in neutron star crusts

Kondratyev, V. N.

Physical Review Letters, 88(22), p.221101_1 - 221101_4, 2002/06

https://doi.org/10.1103/PhysRevLett.88.221101

The neutron star crust magnetodynamics is demonstrated to exhibit erraticjumps at the fields corresponding to the sharp change of nuclide magneticmoments induced by quantization effects. Such a noise originates frommagnetic avalanches and shows intensity and statistical properties which arefavorably compared to the burst activity of soft repeaters.

Phase Change Predictions for Liquid Fuel in Contact with Steel Structure using the Heat Conduction Equation

Brear, D. J.

PNC TN9410 98-005, 53 Pages, 1998/01

PNC-TN9410-98-005.pdf:2.09MB

When liquid fuel makes contact with steel structure the liquid can freeze as a crust and the structure can melt at the surface. The melting and freezing processes that occur can influence the mode of fuel freezing and hence fuel relocation. Furthermore the temperature gradients established in the fuel and steel phases determine the rate at which heat is transferred from fuel to steel. In this memo the 1-D transient heat conduction equations are applied to the case of initially liquid UO brought into contact with solid steel using up-to-date materials properties. The solutions predict criteria for fuel crust formation and steel melting and provide a simple algorithm to determine the interface temperature when one or both of the materials is undergoing phase change. The predicted steel melting criterion is compared with available experimental results.