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Scissors Modes and Spin Excitations in Light Nuclei IncludingΔN=2 Excitations: Behaviour of8Be and10Be by M.S. Fayache; S.Shelley Sharma; L. Zamick is a Physics and Astronomy article available to read on EtoBox.

What is Scissors Modes and Spin Excitations in Light Nuclei IncludingΔN=2 Excitations: Behaviour of8Be and10Be about?

Shell model calculations are performed for magnetic dipole excitations in 8 Be and 10 Be, first with a quadrupole quadrupole interaction (Q } Q) and then with a realistic interaction. The calculations are performed both in a 0p space and in a large space which includes all 2 | excitations. In the 0p with Q } Q we have an analytic expression for the energies of all states. In this limit we find that in 10 Be the L=1 S=0 scissors mode with isospin T=1 is degenerate with that of T=2. By projection from an intrinsic state we can obtain simple expressions for B(M1) to the scissors modes in 8 Be and 10 Be. We plot cumulative sums for energy-weighted isovector orbital transitions from J=0 + ground states to the 1 + excited states. These have the structure of a low-energy plateau and a steep rise to a high-energy plateau. The relative magnitudes of these plateaux are discussed. By comparing 8 Be and 10 Be we find that contrary to the behaviour in heavy deformed nuclei, B(M1) orbital is not proportional to B(E2). On the other hand, a sum rule which relates B(M1) to the difference (B(E2) isoscalar &B(E2) isovector ) succeeds in describing the difference in behaviours in the two nuclei. The r

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Author

M.S. Fayache; S.Shelley Sharma; L. Zamick

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0003-4916)

Published

1996

Language

EN

Field

Physics and Astronomy (Physical Sciences)