Collectivity at<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>in neutron-rich<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:mrow><mml:mn>64</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Gade, A.; Janssens, R. V. F.; Baugher, T.; Bazin, D.; Brown, B. A.; Carpenter, M. P.; Chiara, C. J.; Deacon, A. N.; Freeman, S. J.; Grinyer, G. F.; Hoffman, C. R.; Kay, B. P.; Kondev, F. G.; Lauritsen, T.; McDaniel, S.; Meierbachtol, K.; Ratkiewicz, A.; Stroberg, S. R.; Walsh, Kathleen A.; Weißhaar, D.; Winkler, R.

doi:10.1103/physrevc.81.051304

Cited by 122 publications

(85 citation statements)

References 26 publications

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“…This result was also recently discussed in Ref. [7]. In the current study both models reproduce the rapid rise for Cr isotopes in R 4/2 .…”

Section: Resultssupporting

confidence: 90%

“…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%

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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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“…This result was also recently discussed in Ref. [7]. In the current study both models reproduce the rapid rise for Cr isotopes in R 4/2 .…”

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Collective features of Cr and Fe isotopes

Kotila

Lenzi

2014

Phys. Rev. C

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“…1. The lowest-lying 2 + 1 level experimentally reported so far in the region is the 420-keV state in 64 Cr [9]. It is in line with theoretical calculations [5], which also predict a large value for the B(E2; 2 + → 0 + ) in 64 Cr.…”

Section: Introductionsupporting

confidence: 75%

β−decay of65Mn to65Fe

et al. 2013

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The low-energy structure of 65 Fe has been studied by means of γ and fast-timing spectroscopy at the ISOLDE facility, CERN. A level scheme of 65 Fe populated following the β − decay of 65 Mn was established for the first time. It includes 41 levels and 85 transitions. The excitation energy of the β-decaying isomer in 65 Fe has been precisely determined at 393.7(2) keV. The β-delayed neutron emission branch was measured as P n = 7.9(12)%, which cannot be reconciled with the previously reported value of 21.0(5)%. Four γ rays and four excited states in 64 Fe were identified as being populated following the β-n decay. Four lifetimes and five lifetime limits in the subnanosecond range have been measured using the advanced time-delayed βγ γ (t) method. The level scheme is compared with shell-model calculations. Tentative spin and parity assignments are proposed based on the observed transition rates, the calculations, and the systematics of the region.

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“…However, when removing protons from 68 Ni several experiments of β decay suggest a rapidly weakening of N = 40 gap [5,6], and result in the enhanced quadrupole collectivity in the neutron-rich N = 40 isotones. This is confirmed by the recent measurements of the first excited 2 + states in 64 Cr and 66 Fe [7]. Furthermore, Tarasov and co-workers suggested a new island of inversion in the region of 62 Ti from systematics of production cross sections [8].…”

Section: Introductionsupporting

confidence: 72%

COVARIANT DENSITY FUNCTIONAL ANALYSIS OF SHAPE EVOLUTION IN N = 40 ISOTONES

Wang

Xiang

Long

et al. 2016

Nuclear Structure in China 2014

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Abstract. The structure of low-lying excitation states of even-even N = 40 isotones is studied using a five-dimensional collective Hamiltonian with the collective parameters determined from the relativistic mean-field plus BCS method with the PC-PK1 functional in the particle-hole channel and a separable paring force in the particle-particle channel. The theoretical calculations can reproduce not only the systematics of the low-lying states along the isotonic chain but also the detailed structure of the spectroscopy in a single nucleus. We find a picture of spherical-oblate-prolate shape transition along the isotonic chain of N = 40 by analyzing the potential energy surfaces. The coexistence of low-lying excited 0 + states has also been shown to be a common feature in neutron-deficient N = 40 isotones.

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Collectivity atN=40in neutron-richCr64

Cited by 122 publications

References 26 publications

Collective features of Cr and Fe isotopes

Collective features of Cr and Fe isotopes

β−decay of65Mn to65Fe

COVARIANT DENSITY FUNCTIONAL ANALYSIS OF SHAPE EVOLUTION IN N = 40 ISOTONES

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