isospin


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isospin

[′ī·sə‚spin]
(nuclear physics)
References in periodicals archive ?
In this section we investigate the importance of the isospin I = 0 and I = 1 components as well as their mixing in the calculated spectrum.
Aichelin, "Isospin effects on the energy of vanishing flow in heavy-ion collisions," Journal of Physics G: Nuclear and Particle Physics, vol.
If the force depended on "isospin," then the unusual surplus of protons in water might have profoundly affected Thieberger's observed results.
This means that the self-energy of a nucleon in nuclear matter with momentum k is given by (note that spin and isospin quantum numbers are suppressed) [12, 13]
C'est d'abord une elaboration mathematique, qui implique la theorie des groupes de symetrie pour les grandeurs quantiques qui representent les "proprietes" des particules (operateurs des diverses "saveurs", isospin, etrangete, etc.): de ce point de vue, les particules, ramenees a leurs nombres quantiques, sont constituees de quarks "mathematiques".
In these proceedings of the conference of July 2004, contributors describe their results and research on nuclei near the limits of spin, excitation, energy, isospin and charge.
At low energy, the weak interaction between nucleons in this approach is parameterized by the weak pion coupling constant [f.sub.[pi]], and six other meson coupling denoted as [h.sub.[rho].sup.0], [h.sub.[rho].sup.1], [h'.sub.[rho].sup.1], [h.sub.[rho].sup.2], [h.sub.[omega].sup.0], and [h.sub.[omega].sup.1], where the subscript denotes the exchange meson and the superscript indicates the isospin change.
A measurement of the PV neutron spin rotation in helium ([[phi].sub.PV](n,[alpha])) would provide information about the relative strengths of the weak meson exchange amplitudes, and with the longitudinal analyzing power measurement in the p + [alpha] system, allow the first comparison between isospin mirror systems in weak NN interaction.
The isospin symmetry of the strong interaction implies that [mathematical expression not reproducible].
The electroweak component of the SM is based upon the local gauge group SU[(2).sub.L], x U[(1).sub.Y] acting on the two SU(2) weak isospin flavor states [+ or -] 1/2 in each lepton family and each quark family.
Theoretical estimates of the weak meson coupling constants [1][2] Exchanged Isospin Coupling meson change constant [pi] 1 [H.sub.[pi].sup.1] [rho] 0 [H.sub.[rho].sup.0] [rho] 1 [H.sub.[rho].sup.1] [rho] 2 [H.sub.[rho].sup.2] [rho] 1 [H'.sub.[rho].sup.1] [omega] 0 [H.sub.[omega].sup.0] [omega] 1 [H.sub.[omega].sup.1] Exchanged Best value Reasonable meson (X[10.sup.-6]) range (X[10.sup.-6]) [pi] 1.08 0.0:2.71 [rho] 1.59 -1.59:4.29 [rho] 0.03 0:0.053 [rho] 1.33 -1.06:1.54 [rho] 0.00 None [omega] 0.80 -2.39:4.29 [omega] 0.48 0.32:0.80