Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements

Werner, V.; Benczer‐Koller, N.; Kumbartzki, G.; Holt, J. D.; Boutachkov, P.; Stefanova, E. A.; Perry, M.; Pietralla, N.; Ai, H.; Aleksandrova, K.; Anderson, G. W.; Cakirli, R. B.; Casperson, R. J.; Casten, R. F.; Chamberlain, M.; Copos, Calina; Darakchieva, B.; Eckel, Stephen; Evtimova, M.; Fitzpatrick, C.; Garnsworthy, A. B.; Gürdal, G.; Heinz, A.; Kovacheva, D.; Lambie-Hanson, C.; Liang, X.; Manchev, Peter B.; McCutchan, E. A.; Meyer, D. A.; Qian, J.; Schmidt, Axel; Thompson, Nicholas J.; Williams, E.; Winkler, R.

doi:10.1103/physrevc.78.031301

Cited by 35 publications

(14 citation statements)

References 32 publications

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“…These states, which are the analog of the scissors mode [36][37][38] in deformed nuclei, were unambiguously identified and fully characterized in 94 Mo [39][40][41][42]. Since then, systematic experimental and theoretical studies were devoted to these states in several other nuclei in the vicinity of the N = 50 [43][44][45][46][47][48] and N = 82 [26,49,50] shell closures. A review may be found in Refs.…”

Section: B Results and Discussionmentioning

confidence: 99%

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

et al. 2012

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An iterative matrix diagonalization algorithm endowed with an importance sampling, recently reformulated and tested through large-scale shell model calculations on some heavy Xe isotopes, is here applied to N = 80 isotones. For these nuclei, the iterative sampling procedure is shown to converge more rapidly than in the case of Xe isotopes. The improved convergence rate enables us to produce accurate eigenvalues and eigenfunctions even in spaces of dimensions N ∼ 10 9 . It is therefore possible to offer an exhaustive description of low-energy spectroscopic properties for all N = 80 isotones from 132 Te up to 140 Nd through the calculation of spectra and transition strengths. The results are fairly consistent with the available experimental data and with other shell model calculations based on the Lanczos algorithm.

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Section: B Results and Discussionmentioning

confidence: 99%

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

et al. 2012

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“…We note that even smaller values for R E4 are obtained for the 4 [73]. The breaking of F -spin symmetry caused by this unbalanced proton-neutron content in the wave function is referred to as configurational isospin polarization (CIP) [60,73,74]. However, the 2 + 2 state of 92 Zr evolves into the collective mixed-symmetry states of 94 Mo and 96 Ru to which they are compared in this discussion.…”

Section: Shell-model Calculationsmentioning

confidence: 88%

“…In addition, the similarity to the one-phonon mixed-symmetry state in the quadrupole sector is striking. We note that even smaller values for R E4 are obtained for the 4 [73]. The breaking of F -spin symmetry caused by this unbalanced proton-neutron content in the wave function is referred to as configurational isospin polarization (CIP) [60,73,74].…”

Section: Shell-model Calculationsmentioning

confidence: 91%

Collective excitations ofRu96by means of(p,p′γ)experiments

et al. 2015

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Background: One-phonon mixed-symmetry quadrupole excitations are a well-known feature of near-spherical, vibrational nuclei. Their interpretation as a fundamental building block of vibrational structures is supported by the identification of multi-phonon states resulting from a coupling of fullysymmetric and mixed-symmetric quadrupole phonons. In addition, the observation of strong M 1 transitions between low-lying 3 − and 4 + states has been interpreted as an evidence for one-phonon mixed-symmetry excitations of octupole and hexadecapole character. Purpose: The aim of the present study is to identify collective one-and two-phonon excitations in the heaviest stable N = 52 isotone 96 Ru based on a measurement of absolute M 1, E1, and E2 transition strengths. Methods: Inelastic proton-scattering experiments have been performed at the Wright Nuclear Structure Laboratory (WNSL), Yale University, and the Institute for Nuclear Physics (IKP), University of Cologne. From the acquired proton-γ and γγ coincidence data we deduced spins of excited states, γ-decay branching ratios, and multipole mixing ratios, as well as lifetimes of excited states via the Doppler-shift attenuation method (DSAM). Results: Based on the new experimental data on absolute transition strengths, we identified the 2 + and 3 + members of the two-phonon mixed-symmetry quintuplet (2 + 1,ms ⊗ 2 + 1,s ). Furthermore, we observed strong M 1 transitions between low-lying 3 − and 4 + states suggesting one-phonon symmetric and mixed-symmetric octupole and hexadecapole components in their wave functions, respectively. The experimental results are compared to sdg-IBM-2 and shell-model calculations. Conclusions: Both, the sdg-IBM-2 and the shell-model calculations, are able to describe key features of mixed-symmetry excitations of 96 Ru. Moreover, they support the one-phonon mixedsymmetry hexadecapole assignment of the experimental 4 + 2 state.

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“…2) Zr provide yet another indication of the diversity of configurations in the low-lying excited states, and are good examples of the variety of neutron-proton couplings in this mass region [11]. In contrast, in 90 Zr, protons are excited to the g 9/2 orbitals, resulting in a large positive g(2 + 1 ) factor since g(g 9/2 ) π = +1.510.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive measurements of g factors and transition probabilities have been carried out in the neighboring 38 Sr and 40 Zr isotopes, as a function of level energy and spin in any one isotope, as a function of neutron number in an isotopic chain or for isotonic pairs [1][2][3][4][5][6][7]. These nuclei have Z = 38 or 40 and both values are considered as candidates for subshell closure.…”

Section: Introductionmentioning

confidence: 99%

Structure of the Sr-Zr isotopes near and at the magicN=50shell fromg-factor and lifetime measurements in4088
Kumbartzki
¹
,
Speidel
²
,
Benczer‐Koller
³

et al. 2012
Phys. Rev. C
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Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements

Cited by 35 publications

References 32 publications

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

Collective excitations ofRu96by means of(p,p′γ)experiments

Structure of the Sr-Zr isotopes near and at the magicN=50shell fromg-factor and lifetime measurements in4088
Kumbartzki
¹
,
Speidel
²
,
Benczer‐Koller
³

et al. 2012
Phys. Rev. C
Self Cite
32
0
10
0
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Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements

Cited by 35 publications

References 32 publications

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

Importance-sampling diagonalization algorithm for large-scale shell model calculations onN=80isotones

Collective excitations ofRu96by means of(p,p′γ)experiments

Structure of the Sr-Zr isotopes near and at the magicN=50shell fromg-factor and lifetime measurements in4088Kumbartzki1, Speidel2, Benczer‐Koller3 et al. 2012Phys. Rev. CSelf Cite320100View full textAdd to dashboardCite

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Structure of the Sr-Zr isotopes near and at the magicN=50shell fromg-factor and lifetime measurements in4088
Kumbartzki
¹
,
Speidel
²
,
Benczer‐Koller
³

et al. 2012
Phys. Rev. C
Self Cite
32
0
10
0
View full text Add to dashboard Cite