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[en] Mixed symmetric J/sup π/=1/sup +/ states have been discovered in a large number of nuclei. Three arguments are presented here that the new Ml mode is a rather purely orbital mode: The new mode exhausts a large fraction of sum rule strength, comparison of proton and electron scattering experiments prove the dominance of the orbital over the spin part of the transition matrix element and finally the comparison of (e,e') and (γ,γ') experiments on /sup 156/Gd is used to determine the distribution of orbital Ml strength in this nucleus. Furthermore the systematics of excitation energy and transition strength of the new Ml mode are briefly discussed. Candidates for mixed symmetric J/sup π/=2/sup +/ states in rotational nuclei are presented and the search for the corresponding level in the transitional nucleus /sup 110/Pd is described
Source
Meyer, R.A.; Paar, V; p. 350-361; ISBN 9971-50-141-4; 
; 1986; p. 350-361; World Scientific Pub. Co; Teaneck, NJ (USA); International conference on nuclear structure, reactions, and symmetries; Dubrovnik (Yugoslavia); 5-14 Jun 1986
; 1986; p. 350-361; World Scientific Pub. Co; Teaneck, NJ (USA); International conference on nuclear structure, reactions, and symmetries; Dubrovnik (Yugoslavia); 5-14 Jun 1986
[en] An electron scattering experiment on 110Pd has been performed at fairly small momentum transfers q, searching for mixed symmetry Jπ=1+ and 2+ states predicted by the interacting boson model (IBM). Only some rather weakly excited candidates have been found and used to derive limits for the transition strength of the mixed symmetry states. While the M1 strength is compatible with the IBM predictions there is less E2 strength than expected by the model. (orig.)
Journal
[en] The 24Mg(α, γ0)28Si capture reaction has been studied for bombarding energies 4.4<=Esub(α)<=9.6 MeV. Through angular distributions taken in steps of 60 keV the groundstate yield has been decomposed into its contributing E1 and E2 components. Excitation energies and widths of several narrow 1- and 2+ levels were determined. Significant deviations of the phase factor cosdelta from the statistical expectation value were analysed in terms of a two-state interfering process and yielded as much as (40+-10)% semidirect contributions to the α-capture reaction. (orig.)
Journal
Zeitschrift fuer Physik. A, Atoms and Nuclei; ISSN 0340-2193; ; v. 318(3); p. 339-346
; v. 318(3); p. 339-346
[en] Electric quadrupole transition strengths for the 21+, T = 1 → 01+, T = 1 γ-decay branches are summarized for 10 <= A <= 42 nuclei. In 10B the corresponding branch has been remeasured by use of the 9Be(p,γ)10B resonance reaction at Esub(p) = 320 keV; an upper limit of 0.6% is found. The variation of the E2 strengths within each individual T = 1 isobaric multiplet reveals the particle- or holecharacter of the levels involved. The isoscalar 21+ → 01+ transition strengths in 10 <= A <= 48 nuclei vary between 2 and 20 Weisskopf units showing drastic shell effects. Results for the ratio of neutron and proton matrix elements deduced from analog γ-decay studies and from inelastic pion scattering are compared. (orig.)S
Journal
Zeitschrift fuer Physik. A, Atoms and Nuclei; ISSN 0340-2193; ; v. 306(1); p. 67-72
; v. 306(1); p. 67-72
[en] High-resolution inelastic electron scattering on 154Sm, 158Gd, 164Dy, 168Er and 174Yb provides further evidence on the recently discovered low-lying magnetic dipole mode. We present here spectra, form factors and estimates for transition strengths and use mainly the interacting boson model (IBA-2) for comparison. We also show first results on the fragmentation of the strength of the new mode in 156Gd. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; ; v. 148(4/5); p. 260-264
; v. 148(4/5); p. 260-264
No abstract available
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; v. 17(6); p. 1131-1132
; v. 17(6); p. 1131-1132
[en] Following the identification of the magnetic-dipole scissors mode in 156Gd and 158Gd and in a number of deformed nuclei we report here on a search for it in 154Gd with high-resolution inelastic electron scattering. A strongly excited Jπ=1+ state [B(M1)↑=0.95±0.10 μN2] has been detected at an excitation energy of Ex=2.936 MeV and some more weakly excited states in its vicinity. The total amount of M1 strength is compared with predictions of the interacting boson model (IBM) and of the random phase approximation (RPA). Furthermore it is shown that the distribution of M1 strength is very similar to the one in the other even-even isotopes 156,158,160Gd. (orig.)
Journal
No abstract available
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; v. 17(6); p. 1271-1272
; v. 17(6); p. 1271-1272
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