Nuclear <i>g</i>-factor measurement with time-dependent recoil in vacuum in radioactive-beam geometry

Kuşoğlu, A.; Stuchbery, A.E.; Георгиев, Г.; Goasduff, A.; Atanasova, L.; Balabanski, D. L.; Bostan, M.; Danchev, M.; Detistov, P.; Gladnishki, K.; Ljungvall, J.; Matéa, I.; Radeck, D.; Sotty, C.; Stefan, I.; Verney, D.; Yordanov, Deyan

doi:10.1088/1742-6596/590/1/012041

Cited by 4 publications

(7 citation statements)

References 11 publications

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“…ref. [77]) yields +0.520, is consistent with the most recent experimental counterpart [32]. The overlap improves when also the effects of the MECs on the bare nucleon g-factors in eq.…”

Section: Nucleus Level Energy [Mev]supporting

confidence: 87%

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Magnetic dipole moments as a strong signature for $α$-clustering in even-even self-conjugate nuclei

Stellin¹,

Speidel²,

Meißner³

2022

Preprint

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We investigate the magnetic dipole moments in even-even self-conjugate nuclei from 12 C to 44 Ti. For the latter, the measured gyromagnetic factors of excited states turn out to assume the same value of g ≈ +0.5 within statistical errors. This peculiar feature can be interpreted on the basis of collective excitations of α-clusters. Analogously, the behaviour of the same observable is studied for all isotopes obtained by adding one or two neutrons to the considered self-conjugate nuclei. It is found that for the N = Z + 1 isotopes the α-cluster structure hardly contributes to the observed negative g-factor value, corroborating molecular α-cluster models. The addition of a further neutron, however, restores the original α-cluster g-factors, except for the semi-magic isotopes, in which the deviations from g ≈ +0.5 can be associated with the relevant shell closures. Secondly, we analyze the same observable in the framework of a macroscopic α-cluster model on a finite lattice of side length L. We focus on the discretization effects induced in the magnetic dipole moments of the 2 + 1 and the 3 − 1 states of 12 C at different values of the lattice spacing a.

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“…ref. [77]) yields +0.520, is consistent with the most recent experimental counterpart [32]. The overlap improves when also the effects of the MECs on the bare nucleon g-factors in eq.…”

Section: Nucleus Level Energy [Mev]supporting

confidence: 87%

“…The overlap improves when also the effects of the MECs on the bare nucleon g-factors in eq. ( 2) are included [78], leading to a final value of +0.544 [32]. For the other values of the gyromagnetic factors reported in tab.…”

Section: Nucleus Level Energy [Mev]mentioning

confidence: 99%

Magnetic dipole moments as a strong signature for $α$-clustering in even-even self-conjugate nuclei

Stellin¹,

Speidel²,

Meißner³

2022

Preprint

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“…Therefore, the adoption of pictures that neglect the inner degrees of freedom of the 4 He clusters for the analysis of excited state properties, such as intrinsic magnetic dipole moments, of this class of nuclei appears justified. Motivated by the long standing experimental interest in magnetic moments for 12 C [36], 16 O [37], 20 Ne [38], 24 Mg [39], 28 Si [40], 32 S [41], 36 Ar [40], 40 Ca [42,43], 44 Ti [44] and 48 Cr [45] this paper is dedicated to the theoretical interpretation of these observables throughout light and mediummass α-conjugate nuclei. Moreover, we point out that in part of the aforementioned bibliography, e.g.…”

Section: Preamblementioning

confidence: 99%

Magnetic dipole moments as a strong signature for $$\alpha $$-clustering in even-even self-conjugate nuclei

2022

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We investigate the magnetic dipole moments in even-even self-conjugate nuclei from $$^{12}$$ 12 C to $$^{48}$$ 48 Cr. For these nuclei, the measured gyromagnetic factors of excited states turn out to assume the same value of $$g \approx + 0.5$$ g ≈ + 0.5 within statistical errors. This peculiar feature can be interpreted on the basis of collective excitations of $$\alpha $$ α -clusters. Analogously, the behaviour of the same observable is studied for all isotopes obtained by adding one or two neutrons to the considered self-conjugate nuclei. It is found that for the $$N = Z + 1$$ N = Z + 1 isotopes the $$\alpha $$ α -cluster structure hardly contributes to the observed negative g- factor value, corroborating molecular $$\alpha $$ α -cluster models. The addition of a further neutron, however, restores the original $$\alpha $$ α -cluster g-factors, except for the semi-magic isotopes, in which the deviations from $$g \approx + 0.5$$ g ≈ + 0.5 can be associated with the relevant shell closures. Secondly, we analyze the same observable in the framework of a macroscopic $$\alpha $$ α -cluster model on a finite lattice of side length L. We focus on the discretization effects induced in the magnetic dipole moments of the $$2_1^+$$ 2 1 + and the $$3_1^-$$ 3 1 - states of $$^{12}$$ 12 C at different values of the lattice spacing a.

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“…φ is the relative azimuthal angle between the γ-ray detector and the particle detector, and θ is the polar angle of the γ-ray detector. The time-dependent attenuation coefficient, G k (t), can be measured using a plunger device, which quenches the hyperfine interaction at a particular distance (i.e after a set flight time) by implantation into a foil [19]. By measuring γ-particle coincidence events using a segmented, annular particle detector, θand φ-dependent angular correlations can be measured as a function of time.…”

Section: Attenuation Of γ-Particle Angular Correlationsmentioning

confidence: 99%

Modelling hyperfine interactions for nuclear g-factor measurements

et al. 2020

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A promising technique for g-factor measurements on short-lived nuclear states utilises the hyperfine fields of free ions in vacuum. To fully utilise this technique the hyperfine interaction must be modelled based on atomic structure calculations. Atomic structure calculations were performed using the most recent release of the General Relativistic Atomic Structure Package, and Monte-Carlo simulations of atomic-decay cascades in highly charged ions were developed. The simulations were used to fit experimental data on excited 56Fe ions recoiling in vacuum with a view to determining the first-excited state g factor, g(21+), of 56Fe.

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Nuclear g-factor measurement with time-dependent recoil in vacuum in radioactive-beam geometry

Cited by 4 publications

References 11 publications

Magnetic dipole moments as a strong signature for $α$-clustering in even-even self-conjugate nuclei

Magnetic dipole moments as a strong signature for $α$-clustering in even-even self-conjugate nuclei

Magnetic dipole moments as a strong signature for $$\alpha $$-clustering in even-even self-conjugate nuclei

Modelling hyperfine interactions for nuclear g-factor measurements

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