Measurements of theg-factor ratio of the first 3? and 5? states in40Ca and the lifetime of the 5? state

Mayr, Matthias; Speidel, K.‐H.; Knopp, M.; Karle, W.; Hagelberg, Frank; Simonis, H. J.; Tandon, P.N.; Gerber, J.

doi:10.1007/bf01292404

Cited by 4 publications

(5 citation statements)

References 18 publications

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“…Whereas the same result was obtained for other self-conjugate nuclei, as 24Mg [5] and 4~ [6], the strikingly different behaviour of ZONe remains a so far unexplained exception. Since the applied technique as well as the experimental conditions are quite similar for Z~ and 32S, the observed difference in the g-factors of 2~ can not be instrumental or methodical.…”

Section: Discussionsupporting

confidence: 53%

Measurements of lifetime andg-factor of the 32S(4 1 + ) state at 4.459 MeV

Simonis

Hagelberg

Speidel

et al. 1988

Z. Physik A - Atomic Nuclei

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Section: Discussionsupporting

confidence: 53%

Measurements of lifetime andg-factor of the 32S(4 1 + ) state at 4.459 MeV

Simonis

Hagelberg

Speidel

et al. 1988

Z. Physik A - Atomic Nuclei

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“…For 10 ≤ Z ≤ 16 nuclei the theoretical SM data are obtained through the phenomenological USDB interactions [65], taylored for sd -shell nuclei [66,67]. Conversely, for 36 Ar the WBT interaction in ref. [68] is used in the same model space, whereas for 40 Ca the calculations [69] assume admixtures of random phase approximation 1p-1h states and deformed 3p-3h states [75].…”

Section: Nucleus Level Energy [Mev]mentioning

confidence: 99%

“…For the (7/2) + 1 state of the same nucleus, in tab. 2 the shell-model state with negative parity is constructed from a 36 Ar core with a single neutron in the pf -shell, exploiting the free nucleon g-factors [104]. Core polarization effects are included in the calculation, by considering both the 0 + 1 and the 1 + levels of the α-conjugate core.…”

Section: N = Z + 1 Nucleimentioning

confidence: 99%

“…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 [29], 16 O [30], 20 Ne [31], 24 Mg [32], 28 Si [33], 32 S [34], 36 Ar [33], 40 Ca [35,36] and 44 Ti [37], this paper is dedicated to the theoretical interpretation of these observables throughout light and medium-mass α-conjugate nuclei. Moreover, we point out that in part of the aforementioned bibliography, e.g.…”

mentioning

confidence: 99%

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

Stellin¹,

Speidel²,

Meißner³

2022

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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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“…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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Measurements of theg-factor ratio of the first 3? and 5? states in40Ca and the lifetime of the 5? state

Cited by 4 publications

References 18 publications

Measurements of lifetime andg-factor of the 32S(4 1 + ) state at 4.459 MeV

Measurements of lifetime andg-factor of the 32S(4 1 + ) state at 4.459 MeV

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

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