Delayed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray and conversion-electron spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>97</mml:mn></mml:mrow></mml:math>fission fragments

Rüdigier, M.; Simpson, G. S.; Daugas, J. M.; Blazhev, A.; Fransen, C.; Gey, G.; Hackstein, M.; Jolie, J.; Köster, U.; Małkiewicz, T.; Materna, T.; Pfeiffer, Markus; Ramdhane, M.; Régis, J.-M.; Rother, W.; Thomas, T.; Warr, N.; Wilmsen, D.; Bloas, J. Le; Pillet, N.

doi:10.1103/physrevc.87.064317

Cited by 8 publications

(6 citation statements)

References 37 publications

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“…This assignment is in agreement with the conclusions of a recent theoretical study of odd-A Rb isotopes [34]. The isomeric E1 transition that has since been identified in 97 Rb probably originates from a negative parity Nilsson configuration [14,15].…”

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confidence: 80%

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Rb973760: The Cornerstone of the Region of Deformation aroundA

et al. 2015

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Excited states of the neutron-rich nuclei97;99 Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of 97 Rb as being built on the πg 9=2 ½431 3=2 þ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N ¼ 60 and rotational bands above. The present study defines the limits of the deformed region around A ∼ 100 and indicates that the deformation of 97 Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The 99 Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams. DOI: 10.1103/PhysRevLett.115.172501 PACS numbers: 27.60.+j, 23.20.Lv, 25.70.De, 29.38.-c The spherical symmetry of atomic nuclei is well established for the cases where both the proton (Z) and neutron (N) numbers are near magic numbers. Most atomic nuclei, however, have nonspherical shapes. The best-known and well-studied region of prolate-deformed nuclei is the "rare-earth region," centered between 50 < Z < 82 and 82 < N < 126. A less known region of deformed nuclei, which is predicted to show even larger deformations [1], is centered around mass 100 (A ∼ 100) between the 28 < Z < 50 and 50 < N < 82 major shells. These nuclei are neutron rich, and well away from the valley of stability, so they are challenging to study experimentally.The A ∼ 100 prolate-deformed Sr-Zr region (Z ¼ 38; 40) has attracted considerable attention since its prediction [2] and experimental observation [3]. Spectroscopic studies of these neutron-rich nuclei were undertaken at on-line mass separators and by γ-ray spectroscopy in spontaneous fission [4][5][6]. A key feature is the sudden onset of deformation when progressing from neutron number N ¼ 58 to N ¼ 60. However, the abrupt change of the deformation quickly washes out when moving away from Z ¼ 38 [4].Nuclei at the border of this deformed region, in which the addition or the removal of a single nucleon results in a large shape change, hold the key to its understanding. Tracking

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“…An excited rotational band was observed in 96 Rb 59 [13] providing evidence for shape coexistence in that nucleus. During the data analysis of the present work an isomeric E1 transition in 97 Rb was reported [14,15].…”

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Rb973760: The Cornerstone of the Region of Deformation aroundA

et al. 2015

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“…27. In 97 Rb, an isomeric state at 77 keV was shown to have negative parity [302], and comparison to calculations favoured I π = 1/2 or 3/2 − values for the level that could arise from either an oblate or a prolate shape. The ground-state band in 97 Rb, based on the 3/2 [431] orbital, was determined to have a prolate shape with a large transitional quadrupole moment Q t = 2.95(5) eb [303].…”

Section: Even-even Nuclei With Z ≤40mentioning

confidence: 92%

An experimental view on shape coexistence in nuclei

Garrett

Zielińska

Clément

2022

Progress in Particle and Nuclear Physics

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“…Studies of spontaneous fission of 248 Cm and 252 Cf ahave also revealed excited states of the very-neutron rich 154 Ce [186]. The analysis of the ratio R 4/2 = E(4 + )/E(2 + ) = 3.307 (7) indicates that, in the Ce isotopic chain, the rigid-rotation limit is reached at N = 96, namely two neutrons "later" than in the chain of Nd isotopes.…”

Section: Evolution Of Nuclear Shapes and Shape-coexistence Phenomenamentioning

confidence: 96%

“…7.4.2.2). Further detailed γ -spectroscopy studies of fission fragments, also based on isomerand β-decay spectroscopy (often complemented by neutron capture investigations) have shown a complex scenario of nuclear excitations, pointing to the coexistence of spherical, oblate and prolate shapes in nuclei such as 96,97 Rb [153,154], 96,97,98 Sr [143,[154][155][156][157], 96−98 Y, 98−100 Zr [158,159]. In these nuclei, the excited spherical or deformed structures are most often built on long-lived (e.g., ∼1-10's μs) isomeric states (see also Refs.…”

Section: Evolution Of Nuclear Shapes and Shape-coexistence Phenomenamentioning

confidence: 99%

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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The paper reviews recent developments in $$\gamma $$ γ -ray spectroscopy of the neutron-rich fragments produced in nuclear fission. This subject has been an intensive area of study spanning more than five decades. Here we highlight key results and describe the evolution of the associated experimental techniques since the last review papers in 1995 (I. Ahmad and W.R. Phillips, Rep. Prog. Phys. 58(11), 1415 (1995); J. H. Hamilton et al., Prog. Part. Nucl. Phys. 35, 635(1995)). Research themes in nuclear structure will be explored along with the fission reaction mechanism and the links to nuclear astrophysics and applications.

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Delayedγ-ray and conversion-electron spectroscopy ofA=97fission fragments

Cited by 8 publications

References 37 publications

Rb973760: The Cornerstone of the Region of Deformation aroundA

Rb973760: The Cornerstone of the Region of Deformation aroundA

An experimental view on shape coexistence in nuclei

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

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