Nuclear structure in the neutron-deficient Sn nuclei TKEL effects on lifetime measurements

Siciliano, M.; Valiente-Dobón, J. J.; Goasduff, A.

doi:10.1051/epjconf/201922301060

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…This quantity is proportional to the total excitation energy of the investigated nucleus [26,41]. While, in the Sn case, a TKEL gate was applied to control the direct feeding of the states [4,36], in the present analysis it was used to reduce the possible presence of the inelastically scattered 106 Cd beam, which could contaminate other channels despite the extraordinary performance of the magnetic spectrometer.…”

Section: Resultsmentioning

confidence: 99%

Lifetime measurements in the even-even Cd102–108 isotopes

Siciliano¹,

Valiente-Dobón²,

Goasduff³

et al. 2021

Phys. Rev. C

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Background:The heaviest Tz = 0 doubly-magic nucleus, 100 Sn, and the neighboring nuclei offer unique opportunities to investigate the properties of nuclear interaction in extreme conditions. Studies of light Sn nuclei are hindered by their relatively high mass, proton-rich character and the presence of low-lying isomers. Having only two proton holes in the Z = 50 shell, the Cd isotopes are expected to present features similar to those found in the Sn isotopic chain. Purpose: The aim of this work was to measure lifetimes of excited states in neutron-deficient nuclei in the vicinity of 100 Sn. Methods: The neutron-deficient nuclei in the N ≈ Z ≈ 50 region were populated using a multinucleon transfer reaction with a 106 Cd beam and a 92 Mo target. The complete identification of the beam-like reaction products was possible thanks to the VAMOS++ spectrometer, while the γ rays were detected using the AGATA array. Lifetimes of excited states were determined using the Recoil Distance Doppler-Shift method, employing the Cologne differential plunger. Results: Lifetimes of low-lying states were measured in the even-mass 102−108 Cd isotopes. In particular, multiple states with excitation energy up to ≈ 3 MeV, belonging to various bands, were populated in 106 Cd via inelastic scattering. The transition strengths corresponding to the measured lifetimes were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach. Conclusions: Despite the similarities in the electromagnetic properties of the low-lying states, there is a fundamental structural difference between the ground-state bands in the Z = 48 and Z = 50 isotopes. The comparison between experimental and theoretical results revealed a rotational character of the Cd nuclei, which have prolate-deformed ground states with β2 ≈ 0.2. At this deformation Z = 48 becomes a closed-shell configuration, which is favored with respect to the spherical one.

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Section: Resultsmentioning

confidence: 99%

Lifetime measurements in the even-even Cd102–108 isotopes

Siciliano¹,

Valiente-Dobón²,

Goasduff³

et al. 2021

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Indeed, the Sn isotopes from 100 Sn to 132 Sn, considering up to 32 valence neutrons, represent a unique testing ground for different many-particle shell models. However, the direct study of the properties of neutron-deficient Sn-isotopes is challenging due to the presence of low-lying isomeric states [16]. Therefore, one of the means to infer properties of semi-magic Sn isotopes is the systematic investigation of nuclear structure in the neighbourhood of 100 Sn.…”

Section: Methodsmentioning

confidence: 99%