Decay properties of exotic<i>N</i>≃28 S and Cl nuclei and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>48</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mrow><mml:m

Sorlin, O.; Guillemaud‐Mueller, D.; Mueller, A. C.; Borrel, V.; Dogny, S.; Pougheon, F.; Kratz, K. L.; Gabelmann, H.; Pfeiffer, B.; Wöhr, A.; Ziegert, W.; Penionzhkevich, Yu. É.; Lukyanov, S. M.; Salamatin, V. S.; Anne, R.; Borcea, C.; Fifield, L.K.; Lewitowicz, M.; Saint‐Laurent, M. G.; Bazin, D.; Détraz, C.; Thielemann, Friedrich‐Karl; Hillebrandt, W.

doi:10.1103/physrevc.47.2941

Cited by 151 publications

(104 citation statements)

References 46 publications

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“…Similar information has been found for exotic nuclei around N ¼ 28 [2]. For the latter nuclei, the set of available theoretical [3,4] and experimental [5][6][7][8][9] data provide a coherent description of the gradual erosion of the N ¼ 28 gap and the onset of deformation from the spherical 48 Ca nucleus towards the neutron-rich and oblate deformed 42 Si nucleus [10]. Midway from these two extremes lie the sulfur isotopes of transitional nature, for which spherical or deformed shape coexistence is expected in 43;44 S mainly based on theoretical interpretations of recent experimental data [11,12].…”

supporting

confidence: 56%

Is the7/21−Isomer State ofS43Spherical?

Chevrier¹,

Daugas²,

Gaudefroy³

et al. 2012

Phys. Rev. Lett.

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We report on the spectroscopic quadrupole moment measurement of the 7=2 À 1 isomeric state in 43 16 S 27 [E Ã ¼ 320:5ð5Þ keV, T 1=2 ¼ 415ð3Þ ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, j Q s j¼ 23ð3Þ efm 2 , is larger than that expected for a singleparticle state. Shell model calculations using the modern SDPF-U interaction for this mass region reproduce remarkably well the measured j Q s j , and show that non-negligible correlations drive the isomeric state away from a purely spherical shape. Thanks to recent developments of intense radioactive beams, unexplored landscapes of the Ségré chart such as the structure of nuclei far from the stability line can now be investigated in detail. One of the most striking results from the two last decades is the modification or disappearance of the so-called ''magic numbers'' in exotic nuclei. The first evidence for such structure modification was observed in N ¼ 20 neutron-rich nuclei [1]. Similar information has been found for exotic nuclei around N ¼ 28 [2]. For the latter nuclei, the set of available theoretical [3,4] and experimental [5][6][7][8][9] data provide a coherent description of the gradual erosion of the N ¼ 28 gap and the onset of deformation from the spherical 48 Ca nucleus towards the neutron-rich and oblate deformed 42 Si nucleus [10]. Midway from these two extremes lie the sulfur isotopes of transitional nature, for which spherical or deformed shape coexistence is expected in 43;44 S mainly based on theoretical interpretations of recent experimental data [11,12]. However, no definitive experimental evidence assess shape coexistence in these isotopes. Within the shell model (SM) framework, shape transitions in this mass region reflect the strong increase of correlation energy while moving away from the stability line [13,14]. From a recent interpretation of in-beam -ray spectroscopy data in exotic Si isotopes, the aforementioned increase of the correlation energy was mainly ascribed to proton-neutron interactions [15]. The latter would be responsible for the inversion between natural (i.e., rather spherical) and intruder (i.e., deformed) configurations in both 43;44 S. For the 43 S isomeric state [E Ã ¼ 320:5ð5Þ keV, T 1=2 ¼ 415ð4Þ ns], the spin-parity J ¼ 7=2 À resulting from the natural orbital configuration ð f 7=2 Þ À1 can be inferred from the very good agreement of SM calculations with the recently measured magnetic moment [g exp ¼ À0:317ð4Þ, g SM ¼ À0:280] [12]. The SM furthermore predicts that this normal configuration coexists with the intruder prolate deformed 3=2 À ground state (g.s.).In order to verify this scenario in 43 S, two experimental observations are still missing: (i) evidence for the rotational band built on top of the suspected intruder prolate ground state of the nucleus and (ii) determination of the rather spherical nature of the isomeric state. In this Letter we report on the measurement of the spectroscopic quadrupole moment of the 7=2 À 1 isomeric state using the ...

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supporting

confidence: 56%

Is the7/21−Isomer State ofS43Spherical?

Chevrier¹,

Daugas²,

Gaudefroy³

et al. 2012

Phys. Rev. Lett.

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“…All these phenomena depend strongly on the interplay between the mean field and the pairing field with is correctly described the the HFB theory. Furthermore, the neutronrich N ≈ 28 nuclei play a crucial role in astrophysics for the nucleosynthesis of the heavy Ca-Ti-Cr isotopes [29].…”

Section: Numerical Results and Comparison With Experimental Datamentioning

confidence: 99%

Hartree-Fock-Bogoliubov calculations in coordinate space: Neutron-rich sulfur, zirconium, cerium, and samarium isotopes

et al. 2003

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Using the Hartree-Fock-Bogoliubov (HFB) mean field theory in coordinate space, we investigate ground state properties of the sulfur isotopes from the line of stability up to the two-neutron dripline ( 34−52 S). In particular, we calculate two-neutron separation energies, quadrupole moments, and rms-radii for protons and neutrons. Evidence for shape coexistence is found in the very neutronrich sulfur isotopes. We compare our calculations with results from relativistic mean field theory and with available experimental data. We also study the properties of neutron-rich zirconium ( 102,104 Zr), cerium ( 152 Ce), and samarium ( 158,160 Sm) isotopes which exhibit very large prolate quadrupole deformations.

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“…The evolution of the shell closures far from stability is, however, a subject of intense scrutiny. In particular, experimental studies have shown a breaking of magicity of the N = 20 [1][2][3] and the N = 28 [4,5] configurations for neutron-rich nuclei. Key nuclei in their respective regions, such as 32 Mg and 44 S, display large quadrupole collectivity arising from their prolate deformation.…”

mentioning

confidence: 99%

β decay ofNa32

et al. 2007

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The β-decay of 32 Na has been studied using β-γ coincidences. New transitions and levels are tentatively placed in the level scheme of 32 Mg from an analysis of γ -γ and β-γ -γ coincidences. The structure of nuclei along the valley of stability is well understood in terms of the traditional magic numbers, corresponding to large gaps in single-particle energy levels of nucleons in realistic mean-field theories including a spin-orbit interaction. The evolution of the shell closures far from stability is, however, a subject of intense scrutiny. In particular, experimental studies have shown a breaking of magicity of the N = 20 [1][2][3] and the N = 28 [4,5] configurations for neutron-rich nuclei. Key nuclei in their respective regions, such as 32 Mg and 44 S, display large quadrupole collectivity arising from their prolate deformation. Over the years (and with the steady increase of computing power), shell model calculations have led to a better understanding of the magicity disappearance in certain regions of the nuclear chart (for a recent review, see Ref.[6] and references therein). In the case of the N = 20 shell closure, the so-called "island of inversion" around 32 Mg is due to low energy fp-intruder states competing with the standard sd-orbitals, giving rise to the deformed configurations.Despite many experimental studies, significant features of the 32 Mg level scheme are still unknown. In fact, only the first excited state at 885 keV is firmly assigned as a 2 + state [7]. The other excited states have, at best, only received a tentative assignment. Of interest is the location of the 4 + state to shed

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Decay properties of exoticN≃28 S and Cl nuclei and theCa48/

Cited by 151 publications

References 46 publications

Is the7/21−Isomer State ofS43Spherical?

Is the7/21−Isomer State ofS43Spherical?

Hartree-Fock-Bogoliubov calculations in coordinate space: Neutron-rich sulfur, zirconium, cerium, and samarium isotopes

β decay ofNa32

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