Erratum: Low-lying levels in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cr</mml:mi><mml:mprescripts /><mml:none /><mml:mn>59</mml:mn></mml:mmultiscripts></mml:math>: Inadequacy of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>f</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math>model space and onset of deformation [Phys. Rev. C<b>69</b>, 064301 (2004)]

Freeman, S. J.; Janssens, R. V. F.; Brown, B. A.; Carpenter, M. P.; Fischer, Susan M.; Hammond, N. J.; Honma, Mareki; Lauritsen, T.; Lister, C. J.; Khoo, T. L.; Mukherjee, G.; Seweryniak, D.; Smith, J. F.; Varley, B. J.; Whitehead, M.; Zhu, S.

doi:10.1103/physrevc.70.029901

Cited by 20 publications

(36 citation statements)

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“…In contrast, the LNPS-f p calculations predict a decreasing ratio towards N = 40, reflecting the occurrence of an N = 40 shell gap and highlighting again the inadequacy of the neutron model space in this Hamiltonian. All these observations are consistent with previous work that has demonstrated that the f p model-space alone is inadequate to fully describe the low-lying structure in Cr isotopes heavier than 58 Cr because of the ever increasing role of the 0g 9/2 and 1d 5/2 neutron orbitals [11,16,20,25,41]. In the LNPS effective interaction, the probability of neutron excitations to the ν0g 9/2 and ν1d 5/2 orbitals increases, going from 2p − 2h excitations in Effective charges enter sensitively in the calculation of the theoretical transition strengths since B(E2) = (e p A p + e n A n ) 2 /(2J i + 1), where A p and A n are the proton and neutron shell-model amplitudes.…”

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confidence: 80%

Intermediate-energy Coulomb excitation of58,60,62Cr: The onset of collectivity towardN=40

et al. 2012

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supporting

confidence: 80%

Intermediate-energy Coulomb excitation of58,60,62Cr: The onset of collectivity towardN=40

et al. 2012

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“…In 55,57 Cr, decoupled rotational bands built on the ν g 9/2 state have been reported [29,30], and these bands provide strong experimental evidence for the shape-driving potential of this intruder level, in these specific cases toward substantial prolate deformation. On the other hand, the long-lived 9/2 + isomeric state observed in 59 Cr appears consistent with an oblate core [31]. In any event, the evidence indicates an increasing involvement of the νg 9/2 orbital, when compared to the Ti isotopes.…”

Section: Shape-driving Effects Of the G 9/2 Neutron Orbital In The Crsupporting

confidence: 54%

“…Unexpectedly high binding energies, observed via mass measurements of 31,32 Na [5], were later reproduced in Hartree-Fock calculations when neutron f 7/2 intruder configurations were included [6]. The same effects were subsequently seen in Mg and Ne isotopes around N = 20 [7].…”

Section: Structure Of 30 Mg and Cross-shell Excitations Near The Islamentioning

confidence: 57%

“…Such calculations were performed using the Monte Carlo shell-model method (MCSM) with the SDPF-M interaction [13], to judge the influence of excitations into the fp-shell orbitals. This interaction has previously been used in calculations for a number of neighboring nuclei, including data on 31 Mg [14]. To illustrate the role of cross-shell excitations, the positive-parity states from the MCSM calculations are shown on the right-hand side of figure 1, where states are labeled by spin-parity, excitation energy, and N fp , the average number of neutron excitations into the fp shell.…”

Section: Structure Of 30 Mg and Cross-shell Excitations Near The Islamentioning

confidence: 99%

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Tracking changes in shell structure in neutron-rich nuclei as a function of spin

Janssens

2013

Phys. Scr.

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PAPERTracking changes in shell structure in neutron-rich nuclei as a function of spin Abstract Taking advantage of the resolving power of modern gamma-ray spectrometers in combination with different types of nuclear reactions, it has been possible to investigate to fairly high-spin neutron-rich nuclei in a number of regions of the nuclear chart. The primary motivations for such studies are to characterize changes in shell structure as a function of the neutron-to-proton ratio and to document the impact of a large neutron excess on global properties, such as the nuclear shape. Recent data on nuclei close to the 'island of inversion' near 32 Mg are discussed first. They highlight challenges in describing the observations with modern effective interactions. Subsequently, the nature of excitations in neutron-rich fpg-shell nuclei between Ca and Ni is reviewed. A neutron sub-shell closure at N = 32 has been attributed to the monopole tensor force. Furthermore, the presence of collective excitations at moderate spin in neutron-rich Cr and Fe isotopes illustrates the role of the g 9/2 orbital in driving the nuclear shape. The observations suggest that mixing between 'deformed' and 'shell-model' states needs to be considered. Finally, recent results in the direct vicinity of 68 Ni indicate that the impact of the N = 40 neutron shell closure is rather modest.

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“…Indeed, over the last decade, evidence from experiments performed with complementary techniques at accelerator facilities around the world support this scheme of shell evolution: Low-lying 2 + 1 excited states, generally considered as one indicator of quadrupole collectivity, were identified in β-decay experiments at ISOLDE/CERN and GANIL for 64,66 Fe 38,40 [17] and 60,62 Cr 36,38 [18], respectively. Rotational bands built on 9/2 + states in 55,57 Cr [21] and a low-lying 9/2 + isomer in 59 Cr with possibly oblate deformation [22] were discovered in experiments using fusion-evaporation reactions at ATLAS/ANL.…”

Section: Introductionmentioning

confidence: 97%

In-beam γ-ray spectroscopy towards the nucleon driplines

Gade¹

2011

J. Phys.: Conf. Ser.

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Abstract. The contribution of in-beam γ-ray spectroscopy to nuclear structure research in recent years will be described with the example of the experimental efforts focused on neutronrich Cr and Fe nuclei around neutron number N = 40. Tremendous progress has been made at facilities around the world with complementary spectroscopic techniques, providing important benchmarks for developing shell-model effective interactions and elucidating the driving forces behind shell evolution in the exotic regime. IntroductionThe shell structure of the atomic nucleus is one of the cornerstones for a comprehensive understanding of this strongly correlated fermionic many-body quantum system. Large stabilizing energy gaps between groups of single-particle levels at certain, so-called "magic", fillings of the corresponding single-particle orbitals with protons and/or neutrons are part of the foundation of the nuclear shell model. Doubly-magic nuclei define the model spaces for large-scale calculations. The structure of stable nuclei is rather well described by the traditional nuclear shell model, while significant modifications have been encountered for short-lived, exotic species with unbalanced proton and neutron numbers: New shell gaps develop conventional shell closures vanish. Current theoretical and experimental efforts are focused on investigating how the shell structure changes far away from stability and how these changes relate to the isospin dependence of the N N force. One important experimental task is the quantification of changes in the nuclear structure from the measurement of experimental observables that are calculable and that ultimately allow to discriminate between different theoretical approaches.Major driving forces of shell evolution in neutron-rich nuclei that have been identified so far are the spin-isospin parts of the N N interaction [1], in particular the monopole part of the tensor force [2]. The roles of the central part and 3N forces have been emphasized recently as well [3,4]. Toward the driplines -in the regime of weak nucleon binding -the density dependence of the spin-orbit force and couplings to the continuum will become important [5]. Examples for the shell evolution in neutron-rich nuclei driven by the tensor force are the emergence of new shell gaps at N = 14, 16 and N = 32 in the neutron-rich sd and f p shell, respectively [1, 2].

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Erratum: Low-lying levels inCr59: Inadequacy of thefpmodel space and onset of deformation [Phys. Rev. C69, 064301 (2004)]

Cited by 20 publications

References 1 publication

Intermediate-energy Coulomb excitation of58,60,62Cr: The onset of collectivity towardN=40

Intermediate-energy Coulomb excitation of58,60,62Cr: The onset of collectivity towardN=40

Tracking changes in shell structure in neutron-rich nuclei as a function of spin

In-beam γ-ray spectroscopy towards the nucleon driplines

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