Investigation of negative-parity states in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Dy</mml:mi><mml:mprescripts /><mml:none /><mml:mn>156</mml:mn></mml:mmultiscripts></mml:math>
: Search for evidence of tetrahedral symmetry

Hartley, D. J.; Riedinger, L. L.; Janssens, R. V. F.; Majola, S. N. T.; Riley, M. A.; Allmond, J. M.; Beausang, C. W.; Carpenter, M. P.; Chiara, C. J.; Cooper, Nathan; Curien, D.; Gall, B.; Garrett, P. E.; Kondev, F. G.; Kulp, W. D.; Lauritsen, T.; McCutchan, E. A.; Miller, D.; Miller, S.L.; Piot, J.; Redon, N.; Sharpey‐Schafer, J. F.; Simpson, John; Stefanescu, I.; Wang, X.; Werner, V.; Wood, John L.; Yu, C. H.; Zhu, S.; Dudek, J.

doi:10.1103/physrevc.95.014321

Cited by 10 publications

(13 citation statements)

References 27 publications

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“…First, for the negative-parity bands based on 1-phonon α 3µ excitations, the lowering of the B(E1)/B(E2) branching ratio with lowering spin, as discovered in the experiment, is visible in bands constructed on α 30 and α 31 modes but in the latter, this ratio is about one order of magnitude higher than the experimental one of Ref. [11]. As also seen, in the so called "tetrahedral" and non-axial α 33 bands this quantity is almost independent on spin.…”

Section: Strenght Of B(eλ) Transitionsmentioning

confidence: 53%

“…We hope that we are able to answer the question posed by experimentalist in Ref. [11] in IVB section concerning "band 2": 'Octupole vibrations or tetrahedral symmetry'.…”

Section: Introductionmentioning

confidence: 87%

“…The octupole deformation of the nucleus was confirmed experimentally by studies of experimental observables such as: rotational spectra of quadrupole or octupole deformed nuclei, [7,8], the transition probabilities, magnetic moments and some properties of K-isomers [9,10]. Recently, the investigation of negative-parity, odd-spin states in 156 Dy has been repeated with the high resolving power of the Gammasphere array [11].…”

Section: Introductionmentioning

confidence: 92%

“…As also seen, in the so called "tetrahedral" and non-axial α 33 bands this quantity is almost independent on spin. These facts may suggest that the experimental band, named in the article [11] "band 2" may be most likely of axial octupole (α 30 ) character. Note also that the non-axial α 31 band efficiently competes with the latter.…”

Section: Strenght Of B(eλ) Transitionsmentioning

confidence: 99%

“…The E2 transitions are measured in "band 2" of Ref. [11] for 156 Dy from state 27 − down to 7 − but below they are invisible.…”

Section: Introductionmentioning

confidence: 99%

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Rotational bands in the quadrupole-octupole collective model

Dobrowolski

Mazurek

2018

Phys. Rev. C

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A collective bands of positive and negative parity could be composed of the vibrations and rotations. The rotations of the octupole configurations can be based either on the axial or the non-axial octupole vibrations. A consistent approach to the quadrupole-octupole collective vibrations coupled with the rotational motion enables to distinguish between various scenarios of disappearance of the E2 transitions in negative-parity bands. The here presented theoretical estimates are compared with the recent experimental energies and transition probabilities in and between the groundstate and low-energy negaive-parity bands in 156 Dy. A realistic collective Hamiltonian contains the potential energy term obtained through the macroscopic-microscopic Strutinsky-like method with particle-number-projected BCS approach and deformation-dependent mass tensor defined in vibrational-rotational, nine-dimensional collective space. The symmetrization procedure ensures the uniqueness of the Hamiltonian eigensolutions with respect to the laboratory coordinate system. This quadrupole-octupole collective approach may also allow to find and/or verify some fingerprints of possible high-order symmetries (e.g. tetrahedral, octahedral,...) in nuclear collective bands.

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Section: Strenght Of B(eλ) Transitionsmentioning

confidence: 53%

“…We hope that we are able to answer the question posed by experimentalist in Ref. [11] in IVB section concerning "band 2": 'Octupole vibrations or tetrahedral symmetry'.…”

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 92%

Section: Strenght Of B(eλ) Transitionsmentioning

confidence: 99%

“…The E2 transitions are measured in "band 2" of Ref. [11] for 156 Dy from state 27 − down to 7 − but below they are invisible.…”

Section: Introductionmentioning

confidence: 99%

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Rotational bands in the quadrupole-octupole collective model

Dobrowolski

Mazurek

2018

Phys. Rev. C

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An experimental view on shape coexistence in nuclei

Garrett

Zielińska

Clément

2022

Progress in Particle and Nuclear Physics

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Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

Majola¹,

Bark²,

Bianco³

et al. 2019

Phys. Rev. C

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Low-spin states of 157 Dy have been studied using the JUROGAM II array, following the 155 Gd (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157 Dy has been expanded with four new bands. Rotational structures built on the [523]5/2and [402]3/2 + neutron orbitals constitute new additions to the level scheme as do many of the inter-and intra-band transitions. This manuscript also reports the observation of cross I + → (I-1)and I -→ (I-1) + E1 dipole transitions inter-linking structures built on the [523]5/2 -(band 5) and [402]3/2 + (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s = -i related to possible octupole correlations.Two previous experiments conducted with large Ge detector arrays used heavy-ion induced reactions 150 Nd( 12 C,5n) and 124 Sc( 36 S,3n) [71,72,97] to study the medium to high-spin states of 157 Dy. These experiments reported rotational bands built on the h9/2[521]3/2 -, i13/2[651]3/2 + and h11/2[505]11/2neutrons configurations but reported no transitions linking these structures. To this end we have performed in-beam measurements using the JUROGAM II array to study the rotational bands of 157 Dy and to search for evidence of octupole correlations. We report on four new bands as well as many new linking transitions relative to the previously observed structures.The rotational behaviour of the new bands is described in terms of quasi-particle assignments, and the observed alignment properties are analyzed within the framework of the cranked shell model. II. Experimental details and analysisExcited states of 157 Dy were populated using the 155 Gd (α, 2n) reaction at a beam energy of 25 MeV. The 155 Gd target was 0.98 mg/cm 2 thick with a purity of 91%. Gamma-rays following the fusion evaporation reaction were detected with the JUROGAM II multi-detector array [73] in JYFL, Jyväskylä, Finland. The spectrometer setup comprised 39 high-purity germanium detectors, all with BGO escape suppression shields; 15 EUROGAM coaxial detectors (Phase 1 [75] and GASP [74] type) and 24 EUROGAM Phase II clover detectors [76]. Approximately 14 x 10 9 γ-γ events were unfolded from the data in the off-line analysis and replayed into γ-γ Radware [77, 78] coincidence matrices, which were used to construct the level scheme of 157 Dy. The spins and parities for the new rotational structures were successfully assigned using the Directional Correlation from Oriented States (DCO ratios/RDCO) [79, 80] and linear polarization anisotropy (Ap) methods [81]. While Ap is given as used in [82], the DCO matrices were constructed using data from detectors in the rings at 158° and 86°+94°, thus the RDCO for the JUROGAM II array in this work is; RDCO = I γ1(at 158º : gated on γ2 near 90 º) / I γ1(near 90º : gated on γ2 at 158º)

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Investigation of negative-parity states in Dy156 : Search for evidence of tetrahedral symmetry

Cited by 10 publications

References 27 publications

Rotational bands in the quadrupole-octupole collective model

Rotational bands in the quadrupole-octupole collective model

An experimental view on shape coexistence in nuclei

Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

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