High spin states in129Ba

Schiffer, K.; Byrne, Aidan; Baxter, A.M.; Dracoulis, George; Fabricius, B.; Stuchbery, A.E.

doi:10.1007/bf01290627

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…First, it is demonstrated that the most recent data on 128Ba [-5] reveal that the alternating parity rotational sequence discussed in [-4] extends up to J = 29, suggesting that static octupole deformation may persist to this 11 b I I [ I I I I I I Data are taken from [5,7,9] [6]. This behavior may be interpreted as a signature for the presence of static octupole deformation.…”

Section: 129bamentioning

confidence: 99%

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Possible evidence for static octupole deformation in128,129Ba

Cottle

1991

Z. Physik A - Hadrons and Nuclei

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It is demonstrated that recent experimental results on high spin states of 128,129Ba offer substantial new evidence for static octupole deformation in these nuclei.PACS: 21.60Ev; 27.60 +j Over the last decade, a large amount of experimental evidence supporting the presence of static octupole deformation in two regions of the Periodic Table near A= 150 and 224 has been accumulated. Much of this evidence has been found in studies of high angular momentum behavior of nuclei. Even-even nuclei having static octupole deformation are expected to possess yrast spectra that form A J= 1 rotational bands which obey the J(J+l) rule and in which the states alternate in parity. Octupole deformation in the adjacent odd-A and odd-odd nuclei is also signalled by a characteristic behavior -the existence of closely spaced "parity doublets" of states with equal spins and opposite parities.Recently, both theoretical and experimental efforts have been mounted to identify octupole deformed nuclei in other mass regions (for example, see [-ll). A phenomenological approach to identifying the best candidates for octupole deformation on the basis of the systematic behavior of 3[-states has also been proposed 1-2], and may be summarized as follows. Nuclei which achieve static octupole deformation in the A = 150 and 224 regions occur near local minima (with respect to both N and Z) for 3i-state energies. Consequently, it can be conjectured that the nuclei which are the best candidates for static octupole deformation in a particular region are those which are near the local %-state minimum. A survey of the energies of known 3~ states [-3] in the A= 130 region (Fig. 1) demonstrates that these energies reach minima near N = 64 and Z = 64. From this information, it can be extrapolated that the lowest 31 state energies occur near 128Gd (N=Z= 64), and that the nuclei in this vicinity are the best candidates for static octupole deformation in the region.A survey of high spin spectra of nuclei near N=Z=64 revealed I-4] that in both 126Ba and 128Ba two rotational bands of opposite parity occur which are interleaved in an alternating parity J(J-t-l) pattern in the angular momentum range J= 11-17. This behavior may be interpreted as a signature for the presence of static octupole deformation. However, in order to make a convincing argument that octupole deformation is present in this region it is necessary to identify the signatures of this deformation among a neighborhood of nuclei, including odd-A and odd-odd nuclei, and over a broad range of angular momenta. In the present article, recent high spin data on lZS, t29Ba are analyzed in order to support the octupole deformation argument in this way. First, it is demonstrated that the most recent data on 128Ba [-5] reveal that the alternating parity rotational sequence discussed in [-4] extends up to J = 29, suggest-

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Section: 129bamentioning

confidence: 99%

“…In order to illustrate the parity doublet structure of 129Ba, the states of this nucleus seen in [6] are arranged in three columns in Fig. 3.…”

Section: 129bamentioning

confidence: 99%

Possible evidence for static octupole deformation in128,129Ba

Cottle

1991

Z. Physik A - Hadrons and Nuclei

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56-Barium

Sukhoruchkin¹,

Soroko²

Landolt-Börnstein - Group I Elementary Particles, Nuclei and Atoms

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First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

et al. 2017

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Excited states have been observed for the first time in the neutron-deficient nucleus 117 Ba using the Recoil-Decay Tagging technique following the heavy-ion fusion-evaporation reaction 64 Zn( 58 Ni, 2p3n)117 Ba. Prompt γ rays have been assigned to 117 Ba through correlations with β-delayed protons following the decay of A = 117 recoils. Through the analysis of the γ-γ coincidence relationships, a high-spin level scheme consisting of two bands has been established in 117 Ba. Based on the systematics of the level spacings in the neighboring barium isotopes, the two bands are proposed to have νh 11/2 [532]5/2 − and νd 5/2 [413]5/2 + configurations, respectively. The observed band-crossing properties are interpreted in the framework of cranked shell model.

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High spin states in129Ba

Abstract: The high spin structure of the nucleus 129Ba

Cited by 3 publications

References 4 publications

Possible evidence for static octupole deformation in128,129Ba

Possible evidence for static octupole deformation in128,129Ba

56-Barium

First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

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