Study of the neutron-rich nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Si</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>36</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Liang, X.; Azaiez, F.; Chapman, R.; Haas, F.; Bazzacco, D.; Beghini, S.; Behera, B. R.; Berti, L.; Burns, Michael J.; Caurier, E.; Corradi, L.; Curien, D.; Deacon, A. N.; Angelis, G. de; Dombrádi, Zs.; Farnea, E.; Fioretto, E.; Hodsdon, A.; Gadea, A.; Ibrahim, F.; Jungclaus, A.; Keyes, K.; Latina, A.; Lunardi, S.; Mărginean, N.; Menegazzo, R.; Montagnoli, G.; Napoli, D. R.; Nowacki, F.; Ollier, J.; Papenberg, A.; Pollarolo, G.; Pucknell, V.; Salsac, M. D.; Scarlassara, F.; Smith, J. F.; Spohr, K.; Stănoiu, M.; Stefanini, A. M.; Szilner, S.; Toniolo, N.; Trotta, M.; Verney, D.; Wang, Z.; Wrzesiński, J.

doi:10.1103/physrevc.74.014311

Cited by 29 publications

(12 citation statements)

References 22 publications

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“…From a comparison of the 37 P level schemes of Fig. 3 with the 36 Si yrast states, recently observed by Liang et al [23], we note that the observed groups of doublet states, most clearly observed in the level scheme of Orr [21,22], have excitation energies that closely match those of the 2 + , 4 + , and 6 + yrast states of 36 Si. We therefore propose that the doublet states observed by Orr have spin assignments corresponding to the coupling of the single unpaired 2s 1/2 proton to the yrast states of 36 Si.…”

Section: -3supporting

confidence: 66%

“…Details will be given by Caurier et al [24]. We have checked that the spectroscopy obtained is equivalent to that corresponding to interaction III used in the work of Liang et al [23]. The 37 P level scheme produced from the results of these shell-model calculations is shown in Fig.…”

Section: -3mentioning

confidence: 88%

“…[20][21][22] and the 37 P level scheme of the present work. Also shown are the experimental level scheme for the N = 22 isotone 36 Si from Liang et al [23] and the 37 P level scheme from the results of shell-model calculations using an improved sdpf effective interaction [24]. been recognized [22] that Orr had incorrectly assigned the ground-state transition in the momentum spectrum of 37 P ions.…”

Section: Discussionmentioning

confidence: 99%

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Spectroscopy of neutron-richP37

et al. 2007

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The excited states of the neutron-rich nucleus 37 15 P 22 have been populated in grazing reactions, using a beam of 36 S ions (at 215 MeV) delivered onto a thin 208 Pb target. Emitted γ rays from excited projectile-like nuclei were detected using the CLARA array of 25 escape-suppressed Ge clover detectors in coincidence with reaction products detected and identified with the PRISMA magnetic spectrometer. A level scheme is presented for 37 P together with proposed spin assignments. The level structure of 37 P is discussed within the context of shell-model calculations by using an improved sdpf effective interaction.

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Section: -3supporting

confidence: 66%

Section: -3mentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Spectroscopy of neutron-richP37

et al. 2007

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“…In particular, we show for the first time how this shape transition at low energy can be related to the Jahn-Teller type effect [11,12], where a geometric distortion is brought about by a particular coherent superposition of relevant single-particle states enhanced due to their (near) degeneracy.These studies are performed in terms of the shell model in a unified way with a new Hamiltonian. We shall show 1 A brief account with selected results of this work was presented in [10].calculated energy levels and B(E2) values for the Si and S isotopes that are in good agreement with experiments [13][14][15][16][17][18][19], and new predictions are made. Potential energy surfaces (PES) are shown.…”

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confidence: 54%

Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect

et al. 2012

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We show how shape transitions in the neutron-rich exotic Si and S isotopes occur in terms of shell-model calculations with a newly constructed Hamiltonian based on VMU interaction. We first compare the calculated spectroscopic-strength distributions for the proton 0d 5/2,3/2 and 1s 1/2 orbitals with results extracted from a 48 Ca(e,e'p) experiment to show the importance of the tensorforce component of the Hamiltonian. Detailed calculations for the excitation energies, B(E2) and two-neutron separation energies for the Si and S isotopes show excellent agreement with experimental data. The potential energy surface exhibits rapid shape transitions along the isotopic chains towards N =28 that are different for Si and S. We explain the results in terms of an intuitive picture involving a Jahn-Teller-type effect that is sensitive to the tensor-force-driven shell evolution. The closed sub-shell nucleus 42 Si is a particularly good example of how the tensor-force-driven Jahn-Teller mechanism leads to a strong oblate rather than spherical shape.

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“…Figure 3 shows the isotopic dependence of the excitation energies of the 2 36 Si are taken from Ref. [34]. As seen in the figure, the ratios for 36 Si and 38 Si [R 4/2 = 2.024(4) and 2.09(5)] are close to the vibrational limit, suggesting a nearly spherical shape, whereas R 4/2 for 40 Si increases to 2.56(5), indicating a deviation from the spherical shape or enhancement of quadrupole collectivity at N = 26.…”

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confidence: 99%

Well Developed Deformation inSi42

Takeuchi¹,

Matsushita²,

Aoi³

et al. 2012

Phys. Rev. Lett.

105

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Excited states in 38,40,42 Si nuclei have been studied via in-beam γ-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of 40 S and 44 S provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled γ-γ coincidence measurements. A prominent γ line observed with an energy of 742 (8) 23.20.Lv, 27.40.+z, 29.38.Db Shell closures and collectivity are important properties that characterize the atomic nucleus. Interchange of their dominance along isotopic or isotonic chains has attracted much attention. The recent extension of the research frontier to nuclei far away from the valley of stability has revealed several new phenomena for neutronor proton-number dependent nuclear structure. For example, a weakening or even disappearance of shell closures occur in several neutron-rich nuclei at N = 8 [1][2][3] and N = 20 [4][5][6]. A well known example in the case of N = 20 is the so-called 'island of inversion ' [7] located around the neutron-rich nucleus 32 Mg. The low excitation energy of the first 2 + state E x (2 + 1 ) and large E2 transition probability [4][5][6] clearly indicate shell quenching in 32 Mg despite the fact that N = 20 is traditionally a magic number. The next magic number, N = 28, which appears due to the f 7/2 -f 5/2 spin-orbit splitting, has also been explored [8][9][10][11][12][13]. Weakening of the shell closure is seen by the decrease of the 2 With proton number Z = 14 and neutron number N = 28, the nuclear structure of 42 Si is of special interest. A simple but important question that arises is whether the weakening of the N = 28 shell closure continues, causing an enhancement of nuclear collectivity, or if shell stability is restored owing to a possible doubly magic structure. A study on 42 Si was made by a two-proton removal reaction experiment with radioactive 44 S beams at the NSCL [15]. The small two-proton removal cross sec-

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Study of the neutron-rich nucleusSi36

Cited by 29 publications

References 22 publications

Spectroscopy of neutron-richP37

Spectroscopy of neutron-richP37

Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect

Well Developed Deformation inSi42

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