Tests of pseudospin symmetry via Coulomb excitation measurements on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>187</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Os and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>189</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Os

Bruce, AM; Thwaites, C.; Gelletly, W.; Warner, D. D.; Albers, Sascha; Eschenauer, M.; Schimmer, M.; Brentano, P. von

doi:10.1103/physrevc.56.1438

Cited by 20 publications

(11 citation statements)

References 15 publications

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“…Nilsson orbits of 2d origin in 187;189 Os [40]. Therefore, it becomes clear that it is this specific π1f 5=2 2p SP arrangement that triggers quadrupole coherence in 84 Ge-and it finds its roots in PSS as we will now demonstrate.…”

Section: This Work Literaturementioning

confidence: 53%

Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Delafosse¹,

Verney²,

Marević³

et al. 2018

Phys. Rev. Lett.

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Lifetime measurements of excited states of the light N ¼ 52 isotones 88 Kr, 86 Se, and 84 Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities BðE2; 2 þ → 0 þ Þ and BðE2; 4 þ → 2 þ Þ were obtained for the first time for the hard-to-reach 84 Ge. While the BðE2; 2 þ → 0 þ Þ values of 88 Kr, 86 Se saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g 7=2 , 1h 11=2) space of an inert 78 Ni core, the value obtained for 84 Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N ≲ 49, extend beyond N ¼ 50. The onset of collectivity at Z ¼ 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Section: This Work Literaturementioning

confidence: 53%

Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Delafosse¹,

Verney²,

Marević³

et al. 2018

Phys. Rev. Lett.

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“…In other nuclei from the A = 190 mass region, similar doublet structures have been observed and interpreted in the pseudospin scheme. In 187 Os, for instance, the energy differences between the low-lying doublet levels do not exceed 10 keV [25,26].…”

Section: Pseudospin Symmetry As a Possible Explanation Of The Apmentioning

confidence: 98%

Doublet structure of the negative-parity states inPt195supported by particle-rotor calculations

et al. 2007

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It is shown that particle-triaxial-rotor calculations with a Woods-Saxon potential for 195 Pt reproduce the experimentally observed doublet structure of the excitation spectrum below 700 keV. The observed strong B(E2) transition strengths are also well reproduced. The structure of every doublet is dominated by one out of two single-particle orbitals. The absolute values of the E2 transition probabilities obtained in the particle-rotor model are in overall agreement with the predictions made by assuming a U(6/12) supersymmetry. The ratios of B(E2) values between the states of two doublets agree well with those obtained by assuming a pseudospin symmetry only. This supports the idea of a pseudospin nature of the doublet structure although no a priori assumptions are made concerning a pseudospin symmetry of the Hamiltonian.

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“…Some examples are given in Table 1. Table 1 Experimental (Exp) and relativistic mean field (RMF) [9] pseudospin binding energy splittings ǫ j ′ =l+1/2 − ǫ j=l−1/2 for various doublets in 208 P b. Pseudospin "symmetry" was shown to exist in deformed nuclei as well [10] and has been used to explain features of deformed nuclei, including superdeformation and identical bands [11][12][13][14], and example of which is given in Fig. 1.…”

Section: Pseudospin Symmetrymentioning

confidence: 99%

“…The Dirac Figure 1. Two quasi-degenerate rotational bands in 187 Os, one with pseudospin unaligned with the body-fixed pseudo-angular momentum projectionΛ = 1 and one aligned [13,14].…”

Section: Symmetries Of the Dirac Hamiltonianmentioning

confidence: 99%

A relativistic symmetry in nuclei: Its origins and consequences

Ginocchio¹

2001

Nuclear Physics A

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We review the status of quasi-degenerate doublets in nuclei, called pseudospin doublets, which were discovered about thirty years ago and the origins of which have remained a mystery, until recently. We show that pseudospin doublets originate from an SU(2) symmetry of the Dirac Hamiltonian which occurs when the sum of the scalar and vector potentials is a constant. Furthermore, we survey the evidence that pseudospin symmetry is approximately conserved in nuclear spectra and eigenfunctions and in nucleon-nucleus scattering for a Dirac Hamiltonian with realistic nuclear scalar and vector potentials.

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Tests of pseudospin symmetry via Coulomb excitation measurements on187Os and189Os

Cited by 20 publications

References 15 publications

Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Doublet structure of the negative-parity states inPt195supported by particle-rotor calculations

A relativistic symmetry in nuclei: Its origins and consequences

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