Intermediate-energy Coulomb excitation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>58</mml:mn><mml:mo>,</mml:mo><mml:mn>60</mml:mn><mml:mo>,</mml:mo><mml:mn>62</mml:mn></mml:mrow></mml:msup></mml:math>Cr: The onset of collectivity toward<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>40</mml:mn></mml:mrow></mml:math>

Baugher, T.; Gade, A.; Janssens, R. V. F.; Lenzi, S. M.; Bazin, D.; Brown, B. A.; Carpenter, M. P.; Deacon, A. N.; Freeman, S. J.; Glasmacher, T.; Grinyer, G. F.; Kondev, F. G.; McDaniel, S.; Poves, A.; Ratkiewicz, A.; McCutchan, E. A.; Sharp, D. K.; Stefanescu, I.; Walsh, Kathleen A.; Weißhaar, D.; Zhu, S.

doi:10.1103/physrevc.86.011305

Cited by 56 publications

(46 citation statements)

References 45 publications

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“…Recent shell model calculations using a larger valence space (pf shell for protons and pf 5/2 g 9/2 d 5/2 for neutrons with a 48 Ca core) [17] indicate an important role of the νd 5/2 orbital to describe the onset of collectivity below 68 Ni. Similar conclusions have been drawn from the spectroscopy of neutron-rich Cr isotopes [18,19] and are supported by recent mass measurements of heavy manganese isotopes [20]. A slightly increasing occupation of the νd 5/2 orbital in Fe isotopes with increasing neutron number is also predicted by beyond mean-field calculations [21], but remains small.…”

Section: Introductionsupporting

confidence: 84%

“…In this latter case, calculations have been performed allowing up to ten particles to be excited across N = 40 and Z = 28. It is worth reminding that the extension to a larger valence space than pf 5/2 g 9/2 has been shown to be crucial to reproduce the spectroscopy of N ∼ 40 neutron-rich nuclei in the region of heavy Fe and Cr isotopes [15,16,19]. Furthermore, a 56 Ni core has been claimed to be inappropriate in some cases [57].…”

Section: Resultsmentioning

confidence: 99%

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Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

Louchart¹,

Obertelli²,

Görgen³

et al. 2013

Phys. Rev. C

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Background: Neutron-rich nuclei with protons in the fp shell show an onset of collectivity around N = 40. Spectroscopic information is required to understand the underlying mechanism and to determine the relevant terms of the nucleon-nucleon interaction that are responsible for the evolution of the shell structure in this mass region. Methods: We report on the lifetime measurement of the first 2 + and 4 + states in 70,72,74 Zn and the first 6 + state in 72 Zn using the recoil distance Doppler shift method. The experiment was carried out at the INFN Laboratory of Legnaro with the AGATA demonstrator, first phase of the Advanced Gamma Tracking Array of highly segmented, high-purity germanium detectors coupled to the PRISMA magnetic spectrometer. The excited states of the nuclei of interest were populated in the deep inelastic scattering of a 76 Ge beam impinging on a 238 U target. Results: The maximum of collectivity along the chain of Zn isotopes is observed for 72 Zn at N = 42. An unexpectedly long lifetime of 20 +1.8 −5.2 ps was measured for the 4 + state in 74 Zn. Conclusions: Our results lead to small values of the B(E2; 4 + 1 → 2 + 1 )/B(E2; 2 + 1 → 0 + 1 ) ratio for 72,74 Zn, suggesting a significant noncollective contribution to these excitations. These experimental results are not reproduced by state-of-the-art microscopic models and call for lifetime measurements beyond the first 2 + state in heavy zinc and nickel isotopes.

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Section: Introductionsupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

Louchart¹,

Obertelli²,

Görgen³

et al. 2013

Phys. Rev. C

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“…The deformation, on the other hand, is due to the correlations induced by the multipole part of the effective interaction. Recent experimental and theoretical studies have suggested that neutron-rich chromium and iron isotopes around N = 40 would lie in a new island of inversion [12][13][14]16] as was previously found near 31 Na at N 20 [17][18][19][20]. The increase in collectivity at N = 40 is caused by the excitation of neutrons from the pf shell to both the g 9/2 and d 5/2 orbitals of the upper main shell [4,16].…”

Section: Introductionmentioning

confidence: 66%

“…Unstable nuclei in this region exhibit many interesting phenomena such as the appearance of new magic numbers and the development of new regions of deformation for proton or neutron numbers that are magic near stability. In particular, for heavy Cr and Fe nuclei, there is a sudden increase in the collectivity approaching N = 40, as observed from the lowering of the energies of the 2 + 1 states and the sudden increase of the quadrupole transition probabilities to the ground state in the neutron-rich even-even isotopes [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Collective features of Cr and Fe isotopes

Kotila

Lenzi

2014

Phys. Rev. C

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The question of the sudden increase of collectivity in neutron-rich nuclei when approaching N = 40 has recently interested both experimentalists and theorists. In this paper we study the development of collectivity along the chromium and iron isotopic chains. The calculations are performed within two different perspectives, namely, the proton-neutron interacting boson model (IBM-2) and interacting shell model (ISM) and compared with the available experimental data. The onset of collectivity is studied through nuclear quantities and observables that suggest differences in the nuclear structure of Cr and Fe isotopical chains. Furthermore, a prediction for the shape transition from a spherical vibrator to γ -soft rotor with nucleus 58 Cr standing at the critical point is discussed.

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“…As protons are removed from 68 Ni, a region of deformation centered on 64 Cr develops [13][14][15][16][17][18], where the main components of the ground-state wave function are dominated by configurations in which neutrons are promoted from the fp shell to the g 9/2 orbital across the N = 40 gap. Adding neutrons to 68 Ni, the Z = 28 gap is predicted to become smaller when moving from 68 Ni to 78 Ni, as a result of the attraction between the proton f 5/2 and the neutron g 9/2 orbitals and the repulsion between the proton f 7/2 and neutron g 9/2 configurations.…”

mentioning

confidence: 99%

Neutron single-particle strengths at N=40 , 42: Neutron knockout from Ni68,70 ground and isomeric states

Recchia¹,

Weißhaar²,

Gade³

et al. 2016

Phys. Rev. C

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

Cited by 56 publications

References 45 publications

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

Collective features of Cr and Fe isotopes

Neutron single-particle strengths at N=40 , 42: Neutron knockout from Ni68,70 ground and isomeric states

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