Structure ofLa130at low and medium spins

Abstract

Low-and medium-spin states of the odd-odd nucleus 130 La were studied by in-beam and pulsed-beam γ -ray spectroscopy using the 121 Sb( 12 C,3n) and 116 Sn( 16 O,pn) fusion-evaporation reactions. The decay out of the πh 11/2 ⊗ νh 11/2 and πh 11/2 ⊗ νg 7/2 rotational structures to the ground state has been elucidated. Spin and parity values have been assigned to most of the newly observed states, as well as to the bandheads of the rotational bands. Two isomeric states were identified and placed in the level scheme, with the characteristics J π = 5 + , E x = 214.0 keV, T 1/2 = 0.76(9) μs and J π = 6 + , E x = 319.1 keV, T 1/2 = 33(1) ns. The magnetic and quadrupole interactions of the 6 + isomeric state have been investigated by the time-differential perturbed γ -ray angular distribution method. The g factor value, g(6 + ) = +0.48(3), and the quadrupole coupling constant in polycrystalline metallic Sn lattice, ν Q (6 + ) = 37(4) MHz, have been derived. The experimental data are compared with the predictions of two-quasiparticles plus rotor model calculations.

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“…With the spectral information of the lump at hand, it is natural to investigate the nonlinear stability of the lump solution. By a result of Ionescu-Kenig-Tataru [25], the KP-I equation is well-posed in the natural energy space. Note that while the initial value problem of KP-II is relatively easy to handle (see [10]), the wellposedness (or ill-posedness) of the KP-I equation is much more delicate.…”

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