Quadrupole and octupole collectivity in 148Nd

R. W. Ibbotson; C. A. White; T. Czosnyka; P. A. Butler; N. Clarkson; D. Cline; R. A. Cunningham; M. Devlin; K. G. Helmer; T. H. Hoare; J. R. Hughes; G. D. Jones; A. E. Kavka; B. Kotlinski; R. J. Poynter; P. H. Regan; E. G. Vogt; R. Wadsworth; D. L. Watson; C. Y. Wu

doi:10.1016/S0375-9474(97)00145-0

Quadrupole and octupole collectivity in ¹⁴⁸Nd

R. W. Ibbotson^*, C. A. White, T. Czosnyka, P. A. Butler, N. Clarkson, D. Cline, R. A. Cunningham, M. Devlin, K. G. Helmer, T. H. Hoare, J. R. Hughes, G. D. Jones, A. E. Kavka, B. Kotlinski, R. J. Poynter, P. H. Regan, E. G. Vogt, R. Wadsworth, D. L. Watson, C. Y. Wu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The role of quadrupole and octupole collectivity in the shape-transitional nucleus ¹⁴⁸Nd has been studied by Coulomb excitation using beams of ⁵⁸Ni and ⁹²Mo, and a beam of ¹⁴⁸Nd (using a ²⁰⁸Pb target). The extracted E1, E2 and E3 matrix elements involving states up to 12⁺ in the ground band and 13^- in the negative-parity band are presented, and compared to calculations that assume a vibrational and rotational octupole nature for the negative-parity band. The positive-parity ground-band states are well described in terms of a prolate deformed shape with Q₂₀ ≈ 400 e fm₂ (β^rms₂ ≈ +0.18). The present results suggest a vibrational octupole nature for the low-spin negative-parity states, with an intrinsic moment Q₃₀ ≈ 1500 e fm³ (β^rms₃ ≈ 0.12). The E2 and E3 matrix elements connecting these bands to the β-and γ-vibrational bands (and within these bands) are also presented, and compared to calculations incorporating the coupling between the rotational and vibrational modes. These calculations describe reasonably well the E2 matrix elements involving the gamma band, but do not reproduce the measured E2 matrix elements for the beta band, implying a complicated intrinsic structure for the beta band. The strong enhancement of the measured E3 matrix elements connecting the negative-parity band to the beta band could be indicative of a significant component of the two-phonon octupole vibration in the wavefunction of the so-called beta band.

Original language	English
Pages (from-to)	213-240
Number of pages	28
Journal	Nuclear Physics A
Volume	619
Issue number	1-2
DOIs	https://doi.org/10.1016/S0375-9474(97)00145-0
Publication status	Published - 16 Jun 1997

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Ibbotson, R. W., White, C. A., Czosnyka, T., Butler, P. A., Clarkson, N., Cline, D., Cunningham, R. A., Devlin, M., Helmer, K. G., Hoare, T. H., Hughes, J. R., Jones, G. D., Kavka, A. E., Kotlinski, B., Poynter, R. J., Regan, P. H., Vogt, E. G., Wadsworth, R., Watson, D. L., & Wu, C. Y. (1997). Quadrupole and octupole collectivity in ¹⁴⁸Nd. Nuclear Physics A, 619(1-2), 213-240. https://doi.org/10.1016/S0375-9474(97)00145-0

@article{27fdbb7a04ee4419a186092cdfabca77,

title = "Quadrupole and octupole collectivity in 148Nd",

abstract = "The role of quadrupole and octupole collectivity in the shape-transitional nucleus 148Nd has been studied by Coulomb excitation using beams of 58Ni and 92Mo, and a beam of 148Nd (using a 208Pb target). The extracted E1, E2 and E3 matrix elements involving states up to 12+ in the ground band and 13- in the negative-parity band are presented, and compared to calculations that assume a vibrational and rotational octupole nature for the negative-parity band. The positive-parity ground-band states are well described in terms of a prolate deformed shape with Q20 ≈ 400 e fm2 (βrms2 ≈ +0.18). The present results suggest a vibrational octupole nature for the low-spin negative-parity states, with an intrinsic moment Q30 ≈ 1500 e fm3 (βrms3 ≈ 0.12). The E2 and E3 matrix elements connecting these bands to the β-and γ-vibrational bands (and within these bands) are also presented, and compared to calculations incorporating the coupling between the rotational and vibrational modes. These calculations describe reasonably well the E2 matrix elements involving the gamma band, but do not reproduce the measured E2 matrix elements for the beta band, implying a complicated intrinsic structure for the beta band. The strong enhancement of the measured E3 matrix elements connecting the negative-parity band to the beta band could be indicative of a significant component of the two-phonon octupole vibration in the wavefunction of the so-called beta band.",

author = "Ibbotson, {R. W.} and White, {C. A.} and T. Czosnyka and Butler, {P. A.} and N. Clarkson and D. Cline and Cunningham, {R. A.} and M. Devlin and Helmer, {K. G.} and Hoare, {T. H.} and Hughes, {J. R.} and Jones, {G. D.} and Kavka, {A. E.} and B. Kotlinski and Poynter, {R. J.} and Regan, {P. H.} and Vogt, {E. G.} and R. Wadsworth and Watson, {D. L.} and Wu, {C. Y.}",

year = "1997",

month = jun,

day = "16",

doi = "10.1016/S0375-9474(97)00145-0",

language = "English",

volume = "619",

pages = "213--240",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

number = "1-2",

}

Ibbotson, RW, White, CA, Czosnyka, T, Butler, PA, Clarkson, N, Cline, D, Cunningham, RA, Devlin, M, Helmer, KG, Hoare, TH, Hughes, JR, Jones, GD, Kavka, AE, Kotlinski, B, Poynter, RJ, Regan, PH, Vogt, EG, Wadsworth, R, Watson, DL & Wu, CY 1997, 'Quadrupole and octupole collectivity in ¹⁴⁸Nd', Nuclear Physics A, vol. 619, no. 1-2, pp. 213-240. https://doi.org/10.1016/S0375-9474(97)00145-0

TY - JOUR

T1 - Quadrupole and octupole collectivity in 148Nd

AU - Ibbotson, R. W.

AU - White, C. A.

AU - Czosnyka, T.

AU - Butler, P. A.

AU - Clarkson, N.

AU - Cline, D.

AU - Cunningham, R. A.

AU - Devlin, M.

AU - Helmer, K. G.

AU - Hoare, T. H.

AU - Hughes, J. R.

AU - Jones, G. D.

AU - Kavka, A. E.

AU - Kotlinski, B.

AU - Poynter, R. J.

AU - Regan, P. H.

AU - Vogt, E. G.

AU - Wadsworth, R.

AU - Watson, D. L.

AU - Wu, C. Y.

PY - 1997/6/16

Y1 - 1997/6/16

N2 - The role of quadrupole and octupole collectivity in the shape-transitional nucleus 148Nd has been studied by Coulomb excitation using beams of 58Ni and 92Mo, and a beam of 148Nd (using a 208Pb target). The extracted E1, E2 and E3 matrix elements involving states up to 12+ in the ground band and 13- in the negative-parity band are presented, and compared to calculations that assume a vibrational and rotational octupole nature for the negative-parity band. The positive-parity ground-band states are well described in terms of a prolate deformed shape with Q20 ≈ 400 e fm2 (βrms2 ≈ +0.18). The present results suggest a vibrational octupole nature for the low-spin negative-parity states, with an intrinsic moment Q30 ≈ 1500 e fm3 (βrms3 ≈ 0.12). The E2 and E3 matrix elements connecting these bands to the β-and γ-vibrational bands (and within these bands) are also presented, and compared to calculations incorporating the coupling between the rotational and vibrational modes. These calculations describe reasonably well the E2 matrix elements involving the gamma band, but do not reproduce the measured E2 matrix elements for the beta band, implying a complicated intrinsic structure for the beta band. The strong enhancement of the measured E3 matrix elements connecting the negative-parity band to the beta band could be indicative of a significant component of the two-phonon octupole vibration in the wavefunction of the so-called beta band.

AB - The role of quadrupole and octupole collectivity in the shape-transitional nucleus 148Nd has been studied by Coulomb excitation using beams of 58Ni and 92Mo, and a beam of 148Nd (using a 208Pb target). The extracted E1, E2 and E3 matrix elements involving states up to 12+ in the ground band and 13- in the negative-parity band are presented, and compared to calculations that assume a vibrational and rotational octupole nature for the negative-parity band. The positive-parity ground-band states are well described in terms of a prolate deformed shape with Q20 ≈ 400 e fm2 (βrms2 ≈ +0.18). The present results suggest a vibrational octupole nature for the low-spin negative-parity states, with an intrinsic moment Q30 ≈ 1500 e fm3 (βrms3 ≈ 0.12). The E2 and E3 matrix elements connecting these bands to the β-and γ-vibrational bands (and within these bands) are also presented, and compared to calculations incorporating the coupling between the rotational and vibrational modes. These calculations describe reasonably well the E2 matrix elements involving the gamma band, but do not reproduce the measured E2 matrix elements for the beta band, implying a complicated intrinsic structure for the beta band. The strong enhancement of the measured E3 matrix elements connecting the negative-parity band to the beta band could be indicative of a significant component of the two-phonon octupole vibration in the wavefunction of the so-called beta band.

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JO - Nuclear Physics A

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Quadrupole and octupole collectivity in 148Nd

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Quadrupole and octupole collectivity in ¹⁴⁸Nd