Gamma-ray studies of the γ-vibrational band of 166Er

Reich, C.W.; Cline, J.E.

doi:10.1016/0375-9474(70)90668-8

Cited by 57 publications

(10 citation statements)

References 22 publications

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“…without the direct coupling of the ground and fl-bands. Then, the angular momentum dependence of the matrix elements (5) coincides with the case of two interacting bands having different quadrupole moments, which was considered already in the literature [21].…”

Section: The Positive-parity Statesmentioning

confidence: 92%

Coulomb excitation of230Th with32S,84Kr and142Nd projectiles

Kulessa

Briançon

Lefèbvre

et al. 1989

Z. Physik A - Atomic Nuclei

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The Coulomb excitation measurements for the 23~ nucleus with 328, 84Kr and 142Nd projectiles are presented. The use of different projectiles allowed us to get information in the ground-state band and side bands. The energy spectrum of the ground-state band and of the lowest negative-parity band have been investigated up to the spin value I=24 + and I=19-(21), respectively. Five side bands (K~=0+,2+,2~, 1-,2-) were observed also. The branching ratios for a large number of transitions in the spin region I< 10 for ~= + l and 1<9 for re=-1 are analysed. The full set of experimental data contains information on the mixing of the adiabatic states and on the nuclear response to the electromagnetic field of ;:-radiation. It is shown that the experimental data may be explained taking into account the coupling of the ground-/3-and two 7-bands and also of the K~= 0-, 1-and 2-negative-parity bands. An enhancement of the transitions from the ~-to the/~-band in respect to the transitions from the 7 to the ground band and from the /~-to the ground band is reported. The mixing of the negative-parity bands is found to be typical for the alignment of the octupole-vibrational angular momentum. The strong spin dependence of the intrinsic matrix elements of the electric-dipole operator follows from the branching ratios of inter-and intra-band transitions from the K s=0 states.

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Section: The Positive-parity Statesmentioning

confidence: 92%

Coulomb excitation of230Th with32S,84Kr and142Nd projectiles

Kulessa

Briançon

Lefèbvre

et al. 1989

Z. Physik A - Atomic Nuclei

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“…While in the highly deformed nuclei a one parameter band mixing fit for the gamma bands in ~6,16aEr [2] and a two parameter fit for the beta band in 174Hf [3] yield branching ratios that are consistent with the rotational-vibrational model with perturbational corrections, these states in the transitional nuclei (A= 152-158) cannot be described so simply. The largest discrepancies are with the K ~ =0 + levels.…”

Section: Introductionmentioning

confidence: 86%

Gamma-gamma directional correlations and coincidence studies in154Gd

Gupta

Hamilton

et al. 1977

Z Physik A

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The intensities, placements and E2/M1 mixing ratios of transitions in the decay of ~54Eu have been carefully studied to provide accurate data for microscopic calculations, Coincidence relationships in the decay of 154Eu have been studied extensively with a multiparameter 7-~ coincidence system with two large volume Ge(Li) detectors. Spectra in coincidence with twenty energy gates were analyzed. Twenty-nine new coincidence relationships were established and confirmed most, but not all, of several levels previously assigned by energy fits only. From an analysis of coincidence spectra and singles spectra with a 18% efficiency Ge(Li) detector new information on the gamma-ray intensities were obtained. Precise values of the E2/M1 mixing ratios of transitions from the gamma-and beta-vibrational bands to the g.s. band have been determined from Y-7 directional correlation measurements with a Nal(T1)-Ge(Li) detector coincidence system. Mixing ratios were obtained for a number of other transitions including those from K ~ =0-and 2 + bands from direct and skipped cascade correlations.

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“…As major importance was attached to the determination of the K X(Tm) and K X(Er) intensities in the 166yb~166Tm~t66Er equilibrium source relative to the 80.57 and 82.28 keV y rays, an additional calibration was obtained from a separate measurement with a 26 h t66Ho source (produced by thermal neutron capture in 165Ho). In this decay; over 99.9% of the K holes [5,9] are due to the K conversion of the 80.57 keV E2 transition.…”

Section: Measurementsmentioning

confidence: 97%