New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>158</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:math>

Lesher, S. R.; Aprahamian, A.; Trache, L.; Oros-Peusquens, A. M.; Deyliz, S.; Gollwitzer, A.; Hertenberger, R.; Valnion, B. D.; Graw, G.

doi:10.1103/physrevc.66.051305

Cited by 75 publications

(75 citation statements)

References 25 publications

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“…2 as filled triangles) in the order of excitation energies. The experimental data [9] are shown in the same plot for comparison. The predicted 0 + states are found to be in the right energy range, although deviations can be clearly seen between theory and experiment.…”

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confidence: 96%

“…Therefore, the calculation emphasized the quasiparticle character of these states, in contrast to previous work [10] using collective models. Our results were compared with the remarkable example of recently observed 13 excited 0 + states in 158 Gd [9]. After performing exact angular momentum projection and configuration mixing calculations (by two-body residual interactions) for all the possible low-lying qp configurations that can give rise to K π = 0 + states, we found that the obtained energy lev-…”

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confidence: 99%

“…al. [9] observed 13 0 + states in the nucleus 158 Gd, within an excitation energy range of 1.2 MeV to 3.1 MeV. In Fig.…”

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confidence: 99%

“…al. [9], a remarkable (p, t) experiment revealed a total of 13 excited 0 + states in 158 Gd, below an excitation energy of approximately 3.1 MeV. This abundance of 0 + states in a single nucleus provides significant new information on the poorly understood phenomenon, which has immediately sparked off theoretical interest.…”

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confidence: 99%

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Nature of excited0+states inGd158described by the projected shell model

et al. 2003

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Excited 0 + states are studied in the framework of the projected shell model, aiming at understanding the nature of these states in deformed nuclei in general, and the recently observed 13 excited 0 + states in 158 Gd in particular. The model, which contains projected two-and four-quasiparticle states as building blocks in the basis, is able to reproduce reasonably well the energies for all the observed 0 + states. The obtained B(E2) values however tend to suggest that these 0 + states might have a mixed nature of quasiparticle excitations coupled to collective vibrations.PACS numbers: 21.60. Cs, 23.20.Lv, 27.70.+q Dynamic perturbations of nuclear shapes around the equilibrium can give rise to physical states at low to moderate excitation energies. Classical examples of such motion are β and γ vibrations [1,2], in which nucleons undergo vibrations in a collective manner. Traditionally, the first excited K π = 0 + states and the first excited 2 + states are interpreted, respectively, as the β and γ vibrational states. While the 2 + collective excitations are better understood theoretically, the nature of the lowest 0 + excitation of deformed nuclei still remains under debate [3,4,5,6,7]. The physics of higher 0 + states is even more complex because, on one side, they can predominantly be multi-phonon states based on the single-phonons [8], and on the other side, they can be quasiparticle (qp) excitations in nature. The real situation is, perhaps, that the two aspects, collective excitations and qp states, are mixed by residual interactions.Data on K π = 0 + states have been relatively sparse. In a very recent work by Lesher et. al.[9], a remarkable (p, t) experiment revealed a total of 13 excited 0 + states in 158 Gd, below an excitation energy of approximately 3.1 MeV. This abundance of 0 + states in a single nucleus provides significant new information on the poorly understood phenomenon, which has immediately sparked off theoretical interest. For this energy range, one may think about an explanation through collective modes. In fact, Zamfir, Zhang, and Casten [10] suggested that many of the observed 0 + states may be of two-phonon octupole character. Nevertheless, these authors warned also that, although the mechanism was excluded in their collective models, many of the 0 + states in this excitation energy range may be predominantly two-qp in character.The purpose of the present paper is to investigate whether one can explain the nature of the observed 0 + states in terms of qp excitations. In contrast to Ref.[10], our calculation here does not emphasize the aspect of collective excitation. Although, similar to the work of Zamfir, Zhang, and Casten [10], we may provide only a partial image, our results may shed light on the importance of considering the qp aspects in understanding the nature of these 0 + states.Our study is based on the projected shell model (PSM)[11]. The PSM is the spherical shell model built on a deformed basis. The PSM calculation usually begins with the deformed Nilsson single-particle...

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confidence: 96%

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confidence: 99%

“…al. [9] observed 13 0 + states in the nucleus 158 Gd, within an excitation energy range of 1.2 MeV to 3.1 MeV. In Fig.…”

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confidence: 99%

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confidence: 99%

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Nature of excited0+states inGd158described by the projected shell model

et al. 2003

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“…The (p, t) pickup transfer reaction has been studied in an extensive campaign in the rare earth region [4][5][6][7][8][9] from Gd to Hg. This research has allowed a better understanding of the changes the nuclei undergo from the transitional Gd region -over the well-deformed Yb region -to the γ-soft Pt region and further towards the 208 Pb proton-neutron shell closure.…”

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confidence: 99%