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Extra resources for Ceramic Materials for Primary Loop Flowmeters at Nuclear Powerplants

Example text

Its largest effect in the s shell is expected for j He due to the six nuclear bonds (i < j) available and the relative compactness of thi s system. 25 MeV in jHe, a small amount to alleviate the overbinding problem. However, the second term of the ANN force [Eq. (66)] is angle dependent and draws strong contributions from small AN distances where the singula r T(r) factors make them significant, considerably more than those due to the central term. DHT evaluated this term as function of a cutoff parameter Cl for the AN distances involved, starting from Cl = d, the hard core radius, and increasing it gradually.

However, since these two states are separated by a few MeV only, a mixing could effectively occur between them via the AN CSB interaction, Eq. (29). If (J is the value of the matrix element connecting these I = 0 and I = 1 hypernuclear states and Ll is their separation in excitation, then to first order in (J/Ll these levels "repel" each other by a quantity (J2/Ll. " 17 MeV, this constitutes a negligible effect. 1 MeV. A more dynamically consistent calculation for jH taking into account isospin mixing has been reported (HS 71).

46 MeV for the AN charge-syrnmetry-breaking effect for A = 4. 39 fm (64d) which for the proton part result in a satisfactory fit to the measured lowenergy Ap cross sections, although the larger magnitude [compared to Eqs. (63a)-(63d)] of the Ap scattering lengths indicates a stronger Ap force. t We note that for the singlet quantities in Eqs. (63a)-(63d) and (64a)-(64d) the interchange p ~ n leads from one set to the other. This is clear from the observaiion that for a spin-spin CSB potential its contribution to BA of jH(J = 0) comes from the singlet Ap state and within the variational calculation described above is constrained to give the same value as a spin-independent CSB potential would yield.

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