Exotic states in the S=1 N-pi-K system and low-lying 1/2+ S=-1 resonances

Low-lying Isovector Monopole Resonances 1

Considering the equality of the proton and neutron Fermi levels as an indication of a phenomenological interaction between pairs of protons and neutrons , low-energy isovector monopole resonances are proved to appear in the super-fluid nuclei. The required phenomenological interaction is presented as an isospin symmetry-breaking mean field for the four particle interaction.

Three - body properties of low - lying 12 Be resonances

We compute the three-body structure of the lowest resonances of 12Be considered as two neutrons around an inert 10Be core. This is an extension of the bound-state calculations of 12Be into the continuum spectrum. We investigate the lowest resonances of angular momenta and parities, 0±, 1−, and 2+. Surprisingly enough, they all are naturally occurring in the three-body model. We calculate bulk s...

Low Lying Scalar Resonances and Chiral Symmetry∗

The σ particle was firstly introduced by Gell-Mann and Levy in association with the linear σ model.1 In such a model, the σ meson develops a non-vanishing vacuum expectation value which triggers the spontaneous breaking of chiral symmetry. Pions act as the (pseudo-)goldstone bosons associated with the spontaneous chiral symmetry breaking (SχSB). In the linear σ model the σ meson fills in the li...

Low - Lying Excitations in the S = 1 Antiferromagnetic Heisenberg Chain

In order to confirm the picture of domain-wall excitations in the hidden antiferromagnetic order of the Haldane phase, the structure of the low-lying excitations in the S = 1 antiferromagnetic Heisenberg chain is studied by a quantum Monte Carlo method. It is confirmed that there exists a finite energy gap between the firstand the second-excited states at k = π as well as between the ground sta...

On the Rational Recursive Sequence X_{N+1}=ƔX_{N-K}+(AX_N+BX_{N-K})⁄(CX_N-DX_{N-K})