Download presentation

Presentation is loading. Please wait.

Published byAriana Merchant Modified over 3 years ago

1
CoulEx

2
W. Udo Schröder, 2012 Shell Models 2 Systematic Changes in Nuclear Shapes Møller, Nix, Myers, Swiatecki, Report LBL 1993: Calculations fit to experimental deformations. Nuclear quadrupole moments (Q 0 ) are large for N, Z between magic numbers. Close to magic numbers nuclei are spherical (Q 0 0), small and tightly bound. 2 ~ Q 0

3
Deformed Potential s.p. Model Rotational symmetry broken Conserved quantities: nucleonic angular momentum projections on symmetry axis: = projection of orbital =±1/2= projection of spin = projection of total angular momentum Energy level degeneracy: D =2 (± axial symmetry. Anisotropic harmonic oscillator model Principal quantum number N=n x +n y +n z = number of oscillator quanta. ( x, y, z ) are different fundamental frequencies) W. Udo Schröder, 2012 Shell Models 3 Sven Gösta Nilsson (1955) z Axial Symmetry About z

4
Anisotropic Harmonic Oscillator Model W. Udo Schröder, 2012 Shell Models 4 | || (N,n z,) Shell Gap Deformation Parameter Ground state spin determined by last (unpaired) particle.

5
Shell Stabilized Deformation Why are not all nuclei spherical? Observation: As nucleons are added to spherical (magic, closed-shell) nuclei, deformation increases microscopic origin in nuclear structure & stability. Approximate trends: W. Udo Schröder, 2012 Shell Models 5 x,y / z After G. Musiol et al., Kern-u. Elementarteilchenphysik, VCH 1988 Increasing larger n z /smaller n xy levels bind more strongly. Shell mixing. New shells at integer axis ratio. Disappearance and reappearance of shells.

6
W. Udo Schröder, 2012 Shell Models 6

Similar presentations

Presentation is loading. Please wait....

OK

The Semi-empirical Mass Formula

The Semi-empirical Mass Formula

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on web designing software Convert word document to ppt online free Ppt on stages of economic development Ppt on web services testing Ppt on audible and inaudible sound Ppt on autism Ppt on 48 laws of power Ppt on mauryan administration Ppt on vehicle chassis Free ppt on power of positive thinking