First observation of a mixed-symmetry two-Q-phonon 22,ms+ state in 94Mo

Fransen, C.; Pietralla, N.; Brentano, P. von; Dewald, Α.; Gableske, J.; Gade, A.; Lisetskiy, A. F.; Werner, V.

doi:10.1016/s0370-2693(01)00345-8

Cited by 63 publications

(45 citation statements)

References 21 publications

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“…(1) relied on specific signatures as predicted by the IBM-2. These IBM-2 predictions and assignments for mixed-symmetry states were found to be in an impressive agreement with the data [29][30][31][32] and are further supported by microscopic calculations [34,35]. This motivates us to use the IBM-2 to extract structure information out of this extensive set of measured M1 decay strengths in 94 Mo.…”

Section: Introductionsupporting

confidence: 69%

“…In general J = 0 and, therefore, there can be a magnetic dipole transition to the initial state proportional to the magnetic moment. This elastic transition is not measured in the reported experiments on 94 Mo [29][30][31][32], hence, it is subtracted out in Eq. (3).…”

Section: Generalized M 1 Sum Rulementioning

confidence: 99%

“…In that analysis the parameters g ρ were assumed to have the values of bare orbital g-factors, namely, g π = 1µ N and g ν = 0. The recent extensive measurements of M1 strengths in 94 Mo [29][30][31][32] …”

Section: Generalized M 1 Sum Rulementioning

confidence: 99%

“…94 Mo [29][30][31][32]. This data has been used to identify the set M of mixed-symmetry states listed in Eq.…”

Section: States Inmentioning

confidence: 99%

“…The discovery of the 3 + 1,ms mixed-symmetry state [30] and of the 2 + 2,ms state [31] on the basis of electromagnetic transition matrix elements, added confidence in the general existence of mixed-symmetry states (even off-yrast) and allowed for the first time to judge the energy splitting of the mixed-symmetry two-phonon quintuplet [33]. This new data provides knowledge about M1 transition strengths from a set of mixed-symmetry states M = 1 94 Mo.…”

Section: Introductionmentioning

confidence: 99%

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ExtendedM1sum rule for excited symmetric and mixed-symmetry states in nuclei

et al. 2002

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A generalized M 1 sum rule for orbital magnetic dipole strength from excited symmetric states to mixed-symmetry states is considered within the protonneutron interacting boson model of even-even nuclei. Analytic expressions for the dominant terms in the B(M 1) transition rates from the 2 + 1,2 states are derived in the U(5) and SO(6) dynamic symmetry limits of the model, and the applicability of a sum rule approach is examined at and in-between these limits. Lastly, the sum rule is applied to the new data on mixed-symmetry states of 94 Mo and a quadrupole d-boson ratio n d (02 ) ≈ 0.6 is obtained in a largely parameter-independent way.

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Section: Introductionsupporting

confidence: 69%

Section: Generalized M 1 Sum Rulementioning

confidence: 99%

Section: Generalized M 1 Sum Rulementioning

confidence: 99%

“…94 Mo [29][30][31][32]. This data has been used to identify the set M of mixed-symmetry states listed in Eq.…”

Section: States Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ExtendedM1sum rule for excited symmetric and mixed-symmetry states in nuclei

et al. 2002

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Identification of mixed-symmetry states in odd-A 93Nb

McKay¹,

Orce²,

Lesher³

et al.

The 4th International Conference on Exotic Nuclei and Atomic Masses

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Abstract. The low-spin structure of 93 Nb has been studied using the (n, n γ) reaction at neutron energies ranging from 1.5 to 2.6 MeV and the 94 Zr(p, 2nγ) 93 Nb reaction at bombarding energies from 11.5 to 19 MeV. Excitation functions, lifetimes, and branching ratios were measured, and multipolarities and spin assignments were determined. The J π = 3/2 − and 5/2 − states at 1840 and 2013 keV, respectively, are identified as mixed-symmetry states associated with the (2 + 1,ms ) ⊗ 2p 1/2 particle-core coupling. These assignments are in agreement with energy systematics, spins and parities, and the observed strong M 1 transitions to the 2p 1/2 one-phonon structure. 41 Nb, are expected at similar excitation energies as their even-Z, N = 52 isotone neighbors with feeding of the symmetric one-phonon structures coupled to the low-lying 1g 9/2 and 2p 1/2 single-particle states. We have identified, for the first time in a nearly spherical odd-A nucleus, MS states from M 1 strengths, energy systematics, and spin and parity assignments. PACSThe nucleus 93 Nb was studied using the (n, n γ) reaction at the University of Kentucky and the 94 Zr(p, 2nγ) 93 Nb reaction at the University of Cologne. Figure 1 shows the partial level scheme of interest for 93 Nb. One of the proposed MS states in 93 Nb, the 1840 keV level, has been identified from excitation function and coincidence data in the current work and assigned as a J π = 3/2 − state by the analysis of the angular correlation between the 1153 and 656 keV transitions depopulating states at 1840 and 687 keV, respectively (3/2 − → 3/2 − → 1/2 − ). As shown at the bottom of fig. 2, a mean life of 26(4) fs has been measured for the 1840 keV state through the Doppler-shift attenuation method following the (n, n γ) reaction [10]. Here, the shifted γ-ray energy is given by E γ (θ γ ) = E γ0 [1 + v0 c F (τ ) cos θ γ ], with E γ0 being the

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