Symmetry and Spontaneous Symmetry Break<strong>in</strong>g Selected Groups and Symmetries Spontaneous Symmetry Break<strong>in</strong>g Nuclear Octahedral Shapes - Neutron Spectra Double group Oh D has four 2-dimensional and two 4-dimensional irreducible representations → six dist<strong>in</strong>ct families of levels Neutron Energies [MeV] -2 -4 -6 -8 -10 -12 160 70 Yb 90 {17}[6,1,3] 7/2 {09}[6,4,2] 5/2 {08}[5,0,5] 9/2 {18}[6,1,5] 11/2 {21}[5,0,5] 9/2 {10}[5,4,1] 3/2 {19}[6,3,3] 7/2 {20}[6,1,5] 11/2 {07}[5,4,1] 3/2 {16}[6,2,4] 9/2 {11}[5,0,1] 3/2 {16}[5,4,1] 1/2 {09}[5,0,3] 7/2 {10}[5,3,0] 1/2 {07}[5,0,5] 11/2 {13}[5,2,1] 1/2 {12}[5,0,5] 11/2 {13}[5,0,5] 11/2 {21}[5,1,4] 7/2 {10}[5,2,3] 5/2 {12}[4,0,0] 1/2 {22}[4,4,0] 1/2 {21}[4,0,2] 3/2 118 114 116 94 94 88 100 -.35 -.25 -.15 -.05 .05 .15 .25 .35 Octahedral Deformation 82 126 110 86 88 {08}[6,0,6] 11/2 {07}[6,4,0] 1/2 {06}[8,0,2] 5/2 {10}[6,1,3] 7/2 {11}[6,5,1] 3/2 {17}[6,0,6] 13/2 {07}[5,1,4] 7/2 {12}[5,3,2] 3/2 {11}[5,2,1] 3/2 {11}[5,3,0] 1/2 {07}[8,8,0] 1/2 {08}[4,0,2] 5/2 {09}[6,0,4] 9/2 {08}[5,3,2] 5/2 {21}[5,2,3] 7/2 {14}[5,3,2] 5/2 {16}[5,1,4] 9/2 {08}[5,0,5] 9/2 {21}[4,1,3] 5/2 {13}[4,1,1] 1/2 {23}[4,2,2] 3/2 {08}[5,0,5] 11/2 {08}[5,4,1] 1/2 Strasbourg, August 2002 Dirac-Woods-Saxon α 40(m<strong>in</strong>)=-.350, α40(max)=.350 α 44(m<strong>in</strong>)=-.209, α44(max)=.209 Figure: Full l<strong>in</strong>es correspond to 4-dimensional irreducible representations - they are marked with double Nilsson labels. Observe huge gap at N=114. Jerzy DUDEK <strong>SYMMETRIES</strong> <strong>in</strong> <strong>PHYSICS</strong>
Symmetry and Spontaneous Symmetry Break<strong>in</strong>g Selected Groups and Symmetries Spontaneous Symmetry Break<strong>in</strong>g Nuclear Octahedral Shapes - Proton Spectra Double group Oh D has four 2-dimensional and two 4-dimensional irreducible representations → six dist<strong>in</strong>ct families of levels Proton Energies [MeV] 0 2 -2 -4 -6 -8 -10 -12 160 70 Yb 90 {10}[5,0,5] 11/2 {08}[5,0,3] 7/2 {10}[5,0,3] 7/2 {10}[5,4,1] 3/2 {13}[5,0,5] 11/2 {19}[4,4,0] 1/2 {18}[4,0,2] 3/2 {11}[4,0,0] 1/2 {15}[5,1,4] 7/2 {07}[5,2,3] 5/2 {11}[5,1,2] 5/2 {10}[5,3,2] 5/2 {23}[5,1,4] 9/2 {13}[4,0,4] 7/2 {08}[4,2,2] 3/2 {08}[4,3,1] 1/2 {17}[5,2,3] 7/2 {15}[4,3,1] 1/2 {12}[4,0,2] 5/2 {11}[4,1,3] 5/2 {09}[4,2,0] 1/2 {13}[4,0,4] 9/2 {09}[4,3,1] 3/2 72 58 70 88 52 64 -.35 -.25 -.15 -.05 .05 .15 .25 .35 Octahedral Deformation 82 94 56 88 52 {09}[4,0,2] 5/2 {16}[5,3,2] 5/2 {18}[5,1,4] 9/2 {08}[5,0,5] 9/2 {21}[4,1,3] 5/2 {17}[4,1,3] 7/2 {24}[4,2,2] 3/2 {09}[5,1,2] 5/2 {10}[5,0,5] 9/2 {07}[5,1,0] 1/2 {11}[5,4,1] 3/2 {21}[4,2,0] 1/2 {10}[5,0,5] 11/2 {10}[4,3,1] 1/2 {09}[4,2,2] 3/2 {08}[3,3,0] 1/2 {13}[3,0,1] 3/2 {08}[5,0,3] 7/2 {25}[4,2,2] 5/2 {16}[4,1,3] 7/2 {09}[4,3,1] 3/2 {24}[3,1,2] 3/2 {10}[4,3,1] 1/2 Strasbourg, August 2002 Dirac-Woods-Saxon α 40(m<strong>in</strong>)=-.350, α40(max)=.350 α 44(m<strong>in</strong>)=-.209, α44(max)=.209 Figure: Full l<strong>in</strong>es correspond to 4-dimensional irreducible representations - they are marked with double Nilsson labels. Observe huge gap at Z=70. Jerzy DUDEK <strong>SYMMETRIES</strong> <strong>in</strong> <strong>PHYSICS</strong>
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