Search results for "Spin symmetry"

showing 2 items of 22 documents

Heavy quark symmetry constraints on semileptonic form factors and decay widths of doubly heavy baryons

2007

We show how heavy quark symmetry constraints on doubly heavy baryon semileptonic decay widths can be used to test the validity of different quark model calculations. The large discrepancies in the results observed between different quark model approaches can be understood in terms of a severe violation of heavy quark spin symmetry constraints by some of those models.

QuarkSemileptonic decayPhysicsParticle physicsNuclear and High Energy PhysicsNuclear TheoryHigh Energy Physics::LatticeNuclear TheoryHigh Energy Physics::PhenomenologyQuark modelFOS: Physical sciencesFísicaSymmetry (physics)Nuclear Theory (nucl-th)BaryonHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Heavy quark effective theoryHigh Energy Physics::ExperimentSpin symmetryNuclear ExperimentNuclear theoryPhysics Letters B
researchProduct

Spectroscopy of 70Kr and isospin symmetry in the T = 1 f pg shell nuclei

2016

International audience; The recoil-β tagging technique has been used in conjunction with the 40 Ca(32 S ,2n) reaction at a beam energy of 88 MeV to identify transitions associated with the decay of the 2 + and, tentatively, 4 + states in the nucleus 70 Kr. These data are used, along with previously published data, to examine the triplet energy differences (TED) for the mass 70 isobars. The experimental TED values are compared with shell model calculations, performed with the JUN45 interaction in the fpg model space, that include a J = 0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV. The agreement is found to be very good up to spin 4 and supports the expectat…

nuclear shell modelsisospin symmetrynuclear structure[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]krypton
researchProduct