Shell structure of 
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 and collapse of the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>28</mml:mn></mml:mrow></mml:math>
 shell closure

Momiyama, S.; Wimmer, K.; Bazin, D.; Belarge, J.; Bender, P. C.; Elman, B.; Gade, A.; Kemper, K. W.; Kitamura, N.; Longfellow, B.; Lunderberg, E.; Nııkura, M.; Ota, S.; Schrock, P.; Tostevin, J. A.; Weißhaar, D.

doi:10.1103/physrevc.102.034325

Cited by 14 publications

(14 citation statements)

References 49 publications

(182 reference statements)

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“…Due to the near degeneracy of the Ω π = 7/2 − and 3/2 − orbitals, the ground state of 44 S has a strongly mixed configuration with two neutrons in Ω π = 7/2 − and those in Ω π = 3/2 − . As a result, about half the ground-state wave function of 44 S, i.e., the part with two neutrons occupying the Ω π = 3/2 − , is able to contribute to populating the K π = 3/2 − band in 43 S. The remaining fractions of C 2 S should be distributed to the excited 3/2 − states, which was indeed observed [41].…”

Section: Fromsupporting

confidence: 52%

“…The p 3/2 strengths are fragmented into the states at 1.94, 2.46, and 4.60 MeV, which is impossible to reproduce with the 0hω calculations. The centroids of the spectroscopic factors measured with the 40 Ca( d, p) 41 Ca reaction [38] suggest that the N = 28 shell gap for 40 Ca is 2.5 MeV. The SDPF-MU interaction produces the N = 28 shell gap of 2.94 MeV, which is slightly larger than this value.…”

Section: Frommentioning

confidence: 86%

“…The effective interaction is taken from Ref. [31], a modified SDPF-M interaction whose single-particle energies are fine-tuned to reproduce the correct one-neutron separation energies of 40,41 Ca. Note that the original SDPF-M interaction [11] was designed for the full sd + f 7/2 + p 3/2 model space.…”

Section: Proton Shell Evolutionmentioning

confidence: 99%

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Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces

Utsuno

2022

Physics

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In this paper, the validity of the shell-evolution picture is investigated on the basis of shell-model calculations for the atomic mass number 25≲A≲55 neutron-rich nuclei. For this purpose, the so-called SDPF-MU interaction is used. Its central, two-body spin–orbit, and tensor forces are taken from a simple Gaussian force, the M3Y (Michigan 3-range Yukawa) interaction, and a π+ρ meson exchange force, respectively. Carrying out almost a complete survey of the predicted effective single-particle energies, it is confirmed here that the present scheme is quite effective for describing shell evolution in exotic nuclei.

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Section: Fromsupporting

confidence: 52%

Section: Frommentioning

confidence: 86%

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Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces

Utsuno

2022

Physics

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“…At present, it is believed that the monopole part of the nucleon-nucleon (NN) interaction (especially the tensor force effect) and the three-body interactions determine the shell evolution within the shell model context [5][6][7]. In this sense, new magic numbers such as N = 32 and N = 34 may emerge in calcium isotopes and 14,16,22,24 O are expected to be four possible doubly-magic nuclei [7,8], which are also experimentally confirmed to some extent [9].…”

Section: Introductionmentioning

confidence: 99%

Shell evolution in neutron-rich nuclei: the single particle perspective

Qian

2020

Preprint

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The shell evolution has been studied extensively within the framework of interacting shell model, while the studies from the single particle viewpoint is relatively lacking or neglected. In particular, the isospin dependence of spin-orbit splitting has become increasingly important as N/Z increases in neutron-rich nuclei. Following the initial independent-particle strategy towards explaining the occurrence of magic numbers, we have systematically investigated the isospin effect on the shell evolution of neutron-rich nuclei within the Woods-Saxon (WS) mean-field potential plus the spinorbit term. It is found that new magic numbers N = 14 and N = 16 may emerge in neutron-rich nuclei if one changes the sign of the isospin-dependent term in the spin-orbit coupling while the traditional magic number N = 20 may disappear. The magic number N = 28 is expected to be destroyed despite the sign choice of the isospin part in spin-orbit splitting, while N = 50 may disappear and N = 82 persists within the single particle scheme. Besides, an appreciable amount of energy gap appears at N = 32 and 34 in neutron-rich Ca isotopes. All these results are more consistent with those of the interacting shell model, when the sign of the isospin term of the WS potential is different from that of the corresponding spin-orbit coupling part. The present study may provide a more reasonable starting point for not only the interacting shell but also other nuclear many-body calculations towards the neutron-dripline.

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“…This will induce strong quadrupole correlations between the nucleons near the Fermi surface, which leads to various quadrupole deformation of the low-lying states [28][29][30]. In fact, recent accumulation of experimental data for the low-lying states and their electric transitions [31][32][33] are revealing the onset of the ground state deformation and the quenching of the N = 28 shell gap in neutron-rich Mg, Si, S and Ar isotopes. Therefore, it is important to theoretically investigate the deformation of each isotopes and provide an insight to the mechanism behind it.…”

Section: Introductionmentioning

confidence: 99%

Triaxial deformation and the loss of the N = 28 shell gap

Suzuki,

Kimura

2021

Preprint

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Background: Recent accumulation of experimental data is revealing the nuclear deformation in vicinity of 42 Si. This requests systematic theoretical studies to clarify more specific aspects of nuclear deformation and its causes.Purpose: The purpose of this study is to investigate the nature and cause of the nuclear deformations and its relation to the loss of the neutron magic number N = 28 in vicinity of 42 Si. Method:The framework of antisymmetrized molecular dynamics with Gogny D1S density functional has been applied. The model assumes no spatial symmetry and can describe triaxial deformation. It also incorporates with the configuration mixing by the generator coordinate method.Results: We show that the shell effects and the loss of the magicity induce various nuclear deformations. In particular, the N = 26 and N = 30 isotones have triaxially deformed ground states.We also note that the erosion of the N = 28 magicity gradually occurs and has no definite boundaries. Conclusion:The present calculation predicts various nuclear deformations in vicinity of 42 Si, and suggests that the inter-band electric transitions are good measure for it. We also remark that the magicity is lost without the single-particle level inversion in the oblate deformed nuclei such as 42 Si.

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Shell structure of S43 and collapse of the N=28 shell closure

Cited by 14 publications

References 49 publications

Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces

Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces

Shell evolution in neutron-rich nuclei: the single particle perspective

Triaxial deformation and the loss of the N = 28 shell gap

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