“…In the second row of Table 1 we wrote down the form factors which we obtained with the help of a Nilsson mixture of levels proposed by Lovhoiden et aL [7]. In their theoretical analysis these authors coupled The results concerning the absoluteft values are presented in Table 2.…”
Section: (N S If Jr ] [ Ni I Ji> V N Rz Mrs R J ~ (K K )mentioning
A good agreement between theory and experiment is achieved if besides the Coriolis force effect, the centrifugal and spin-spin polarization effects are considered in the calculation of the absolute ft values for the AN= 2 beta transitions 15SEu--. lSSGd. An important improvement is also obtained for the first forbidden transitions if the spin-spin polarization effects are taken into account.
“…In the second row of Table 1 we wrote down the form factors which we obtained with the help of a Nilsson mixture of levels proposed by Lovhoiden et aL [7]. In their theoretical analysis these authors coupled The results concerning the absoluteft values are presented in Table 2.…”
Section: (N S If Jr ] [ Ni I Ji> V N Rz Mrs R J ~ (K K )mentioning
A good agreement between theory and experiment is achieved if besides the Coriolis force effect, the centrifugal and spin-spin polarization effects are considered in the calculation of the absolute ft values for the AN= 2 beta transitions 15SEu--. lSSGd. An important improvement is also obtained for the first forbidden transitions if the spin-spin polarization effects are taken into account.
“…Pour ce faire, nous avons fait des calculs pour deux positions de la surface de Fermi Â, équidistantes, et de part et d'autre, de la position de la sous-couche h11/2 pour e = 0. Il (3) Des diagonalisations « exactes » de l'hamiltonien (1) ont également été effectuées par d'autres auteurs [12].…”
Résumé. 2014 Abstract. 2014 The limits of the rotation alignment model of Stephens are studied. The conditions of applicability of the assumption of constant j for a unique parity isolated sub-shell (extended to N = 4 and N = 3) are discussed and explanations are given. A correct treatment of the eigenstates of the intrinsic motion allows however a simple extension of the model to non-isolated sub-shells without enlarging the basis of diagonalisation.
“…The latter procedure is justified as the E 2 transition probabilities can be assumed to be insensitive to the intrinsic structure of the states. The E2/M1 mixing amplitude can be theoretically calculated for the nonadiabatic case as well as for the adiabatic one by applying the formulae ( 6)- (13). The calculations of the M 1 transition probabilities depend on the parameters g,, g z and g,, but there is a considerable uncertainty in the choice of these parameters.…”
Levels within three rotational bands in the odd A nuclide 169Yb have been excited in the 167Er(α,2n)169Yb reaction. The positive parity ground-state band is strongly perturbed. The observed energy levels and relative transition rates within this band are compared with the results of a Coriolis coupling calculation. Good agreement is obtained if the theoretical Coriolis coupling strength is reduced for the orbitals close to the Fermi surface. With gs = gsfree and non-adiabatic wavefunctions the experimental E2/M1 mixing ratios are reproduced for the 7/2+ [633] ground-state band. The magnetic moment for the ground-state has been calculated and is compared with the measured one for the isotone 167Er. This comparison indicates that the mechanism which reduces the Coriolis matrix elements may also be effective in preventing interband M1 transitions with |ΔK| = 1. The results of a Coriolis coupling calculation for N = 5 bands are also discussed. The rotational levels in the doubly-even nuclides 168Yb and 170Yb are observed up to the 10+ member.
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