Particle-hole and vibrational states in doubly closed subshell 96Zr from in-beam inelastic neutron and proton scattering

G. Molnár, T. Belgya, B. Fazekas, Á Verbs, S. W. Yates, E. W. Kleppinger, R. A. Gatenby, R. Julin, J. Kumpulainen, A. Passoja, E. Verho

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Abstract

Through in-beam (n, n′ γ) and (p, p′ γ) reaction studies, we have identified 33 levels in 96Zr and, from (n, n′) cross section and γ-ray angular distribution data, we have made spin-parity assignments for twenty of these levels. Recent DSAM nuclear level lifetimes were combined with electronic timing measurements in interpreting these states. The 1750 keV 2+ and 2439 keV 3+ states are suggested as the lowest neutron particle-hole multiplet, of ν(3s 1 2, 2d 5 2-) type, expected from the double closed subshell picture. On the other hand, the band built on the 1582 keV 0+ shape isomer is determined to have vibrational collectivity up to the two-phonon level. Candidates for two-phonon vibrational states of quadrupole-octupole and double octupole type, associated with the ground-state structure exhibiting octupole softness, are proposed.

Original languageEnglish
Pages (from-to)43-76
Number of pages34
JournalNuclear Physics A
Volume500
Issue number1
DOIs
Publication statusPublished - Aug 14 1989

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proton scattering
vibrational states
inelastic scattering
neutron scattering
softness
rays
parity
angular distribution
isomers
quadrupoles
fine structure
time measurement
neutrons
life (durability)
ground state
cross sections
electronics

Keywords

  • Nuclear Reactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Particle-hole and vibrational states in doubly closed subshell 96Zr from in-beam inelastic neutron and proton scattering. / Molnár, G.; Belgya, T.; Fazekas, B.; Verbs, Á; Yates, S. W.; Kleppinger, E. W.; Gatenby, R. A.; Julin, R.; Kumpulainen, J.; Passoja, A.; Verho, E.

In: Nuclear Physics A, Vol. 500, No. 1, 14.08.1989, p. 43-76.

Research output: Contribution to journalArticle

Molnár, G, Belgya, T, Fazekas, B, Verbs, Á, Yates, SW, Kleppinger, EW, Gatenby, RA, Julin, R, Kumpulainen, J, Passoja, A & Verho, E 1989, 'Particle-hole and vibrational states in doubly closed subshell 96Zr from in-beam inelastic neutron and proton scattering', Nuclear Physics A, vol. 500, no. 1, pp. 43-76. https://doi.org/10.1016/0375-9474(89)90129-2
Molnár, G. ; Belgya, T. ; Fazekas, B. ; Verbs, Á ; Yates, S. W. ; Kleppinger, E. W. ; Gatenby, R. A. ; Julin, R. ; Kumpulainen, J. ; Passoja, A. ; Verho, E. / Particle-hole and vibrational states in doubly closed subshell 96Zr from in-beam inelastic neutron and proton scattering. In: Nuclear Physics A. 1989 ; Vol. 500, No. 1. pp. 43-76.
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AU - Verbs, Á

AU - Yates, S. W.

AU - Kleppinger, E. W.

AU - Gatenby, R. A.

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AU - Verho, E.

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AB - Through in-beam (n, n′ γ) and (p, p′ γ) reaction studies, we have identified 33 levels in 96Zr and, from (n, n′) cross section and γ-ray angular distribution data, we have made spin-parity assignments for twenty of these levels. Recent DSAM nuclear level lifetimes were combined with electronic timing measurements in interpreting these states. The 1750 keV 2+ and 2439 keV 3+ states are suggested as the lowest neutron particle-hole multiplet, of ν(3s 1 2, 2d 5 2-) type, expected from the double closed subshell picture. On the other hand, the band built on the 1582 keV 0+ shape isomer is determined to have vibrational collectivity up to the two-phonon level. Candidates for two-phonon vibrational states of quadrupole-octupole and double octupole type, associated with the ground-state structure exhibiting octupole softness, are proposed.

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