Relative measurement of the quadrupole moments of the first excited states of the even isotopes of Ru, Pd and Cd

Maynard, M.; Palmer, D C; Cresswell, J.R.; Forsyth, P.D.; Hall, I.; Martin, Douglas

doi:10.1088/0305-4616/3/12/012

Cited by 39 publications

(5 citation statements)

References 23 publications

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“…good agreement with the available spectroscopic data. For the 2 + state in 98 Ru the calculated magnetic dipole moment +0.445µ N is in agreement with the experimental value +0.8 (6)µ N [82] and the electric quadrupole moment −0.129e 2 b agrees with the experimental value -0.03(14)e 2 b [83] also. The interaction also manages to predict that the 4 + , 5 + , 6 + states in 98 Tc are below 70 keV, though does not get the ordering quite right.…”

Section: Higher-forbidden Decayssupporting

confidence: 85%

Double β Decay and the Axial Strength

Suhonen

Kostensalo

2019

Front. Phys.

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Quenching of the weak axial strength g A is discussed and relations of this quenching to the nuclear matrix elements of double beta decays are highlighted. An analysis of Gamow-Teller transitions in the mass range A = 62 − 142 is presented and its results are compared with those of many previous works. The enhancement of the axial charge is discussed for first-forbidden pseudoscalar β transitions. Higher-forbidden β transitions are introduced and their role in determining the effective value of g A is examined, in particular from the point of view of the β-decay half-lives and the shapes of electron spectra of forbidden non-unique β transitions. Keywords: double beta decay, Gamow-Teller beta decay, quenching of weak axial coupling, forbidden beta decay, enhancement of weak axial charge, electron spectral shapes

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Section: Higher-forbidden Decayssupporting

confidence: 85%

Double β Decay and the Axial Strength

Suhonen

Kostensalo

2019

Front. Phys.

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“…However, A number of nuclear models have been invoked to explain the structure properties of the even-A Ru nuclei as the rigid triaxial rotor model of Davydov and Filippov, the generalized triaxial rotor which includes P vibrations, ' the interacting boson approximation of Arima and Iachello, ' and the generalized collective model of Gneuss and Greiner. 3 For ' Ru, ' Ru, and ' Ru the experimental data seem to agree better with the predictions of the asymmetric rotor model. "'"'"…”

Section: Experimental Procedures and Resultsmentioning

confidence: 74%

“…Furthermore, they decrease rapidly with the increase of the neutron number. 3 states have been Coulomb excited in three of the five studied isotopes. In ' Ru the decay pattern of the 3 level at 1970 keV agrees'very well with that previously evinced.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Quadrupole moments of the first excited states ofRu96,Ru
Landsberger
¹
,
Lecomte
²
,
Paradis
³

et al. 1980
Phys. Rev. C
50
0
8
0
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The static quadrupole moments of the first 2+ excited states of "' " ' " 'Ru were measured employing the reorientation effect in Coulomb excitation. For constructive interference via the second 2+ excited states the determined quadrupole moments are ( -0.13+0.09) eb for "Ru, ( -0.20+0.09) eb for 'Ru, ( -0.43+0.07) eb for ' Ru, ( -0.57+0.07) eb for ' 'Ru, and ( -0.70+0.08) eb for ' 'Ru. These Q, + represent, respectively, 29%, 36%, 67%, 78%, and 84% of the rotational value.

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“…The even cadmium isotopes with Z = 48 and mass numbers near A = 110 have long been considered good examples of spherical vibrational nuclei [1]. The discovery of non-zero electric quadrupole moments for the 2 + excited states [2][3][4], consistent with weak deformations of 2 ∼ 0.15, was handled by introducing anharmonicities into the vibrational model [5,6]. Later, the presence of intruder states, due to the 2-particle 4-hole proton excitations near the nominal two-phonon triplet, was included through configuration mixing [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy and excited-state g factors in weakly collective Cd111 : Confronting collective and microscopic models

et al. 2019

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Background: The even cadmium isotopes near the neutron midshell have long been considered among the best examples of vibrational nuclei. However, the vibrational nature of these nuclei has been questioned based on E2 transition rates that are not consistent with vibrational excitations. In the neighbouring odd-mass nuclei, the g factors of the low-excitation collective states have been shown to be more consistent with a deformed rotational core than a vibrational core. Moving beyond the comparison of vibrational versus rotational models, recent advances in computational power have made shell-model calculations feasible for Cd isotopes. These calculations may give insights into the emergence and nature of collectivity in the Cd isotopes.Purpose: To investigate the nature of collective excitations in the A ∼ 100 region through experimental and theoretical studies of magnetic moments and electromagnetic transitions in 111 Cd. Method:The spectroscopy of 111 Cd has been studied following Coulomb excitation. Angular correlation measurements, transient-field g-factor measurements and lifetime measurements by the Doppler-broadened line shape method were performed. The structure of the nucleus was explored in relation to particle-vibration versus particlerotor interpretations. Large-scale shell-model calculations were performed with the SR88MHJM Hamiltonian.Results: Excited-state g factors have been measured, spin assignments examined and lifetimes determined. Attention was given to the reported 5/2 + 753-keV and 3/2 + 755-keV states. The 3/2 + 755-keV level was not observed; evidence is presented that the reported 3/2 + state was a misidentification of the 5/2 + 753-keV state.Conclusions: It is shown that the g factors and level structure of 111 Cd are not readily explained by the particlevibration model. A particle-rotor approach has both successes and limitations. The shell-model approach successfully reproduces much of the known low-excitation structure in 111 Cd.

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Relative measurement of the quadrupole moments of the first excited states of the even isotopes of Ru, Pd and Cd

Cited by 39 publications

References 23 publications

Double β Decay and the Axial Strength

Double β Decay and the Axial Strength

Quadrupole moments of the first excited states ofRu96,Ru
Landsberger
¹
,
Lecomte
²
,
Paradis
³

et al. 1980
Phys. Rev. C
50
0
8
0
View full text Add to dashboard Cite

Spectroscopy and excited-state g factors in weakly collective Cd111 : Confronting collective and microscopic models

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Relative measurement of the quadrupole moments of the first excited states of the even isotopes of Ru, Pd and Cd

Cited by 39 publications

References 23 publications

Double β Decay and the Axial Strength

Double β Decay and the Axial Strength

Quadrupole moments of the first excited states ofRu96,RuLandsberger1, Lecomte2, Paradis3 et al. 1980Phys. Rev. C50080View full textAdd to dashboardCite

Spectroscopy and excited-state g factors in weakly collective Cd111 : Confronting collective and microscopic models

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About

Quadrupole moments of the first excited states ofRu96,Ru
Landsberger
¹
,
Lecomte
²
,
Paradis
³

et al. 1980
Phys. Rev. C
50
0
8
0
View full text Add to dashboard Cite