Properties of 119Sb in the semi-microscopic model

doi:10.1016/0375-9474(69)90377-7

Nuclear Physics A

Volume 138, Issue 1, 24 November 1969, Pages 19-32

https://doi.org/10.1016/0375-9474(69)90377-7 Get rights and content

Abstract

The semi-microscopic model of the nucleus assuming a proton coupled to a quadrupole vibrator is applied to antimony. The stability of the results is investigated. The calculated energies, spectroscopic factors and electromagnetic properties of the low-lying states are in satisfactory agreement with experiments.

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A microscopic description of fermion boson interaction
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Low-lying states of 119Sb studied from the decay of 119mTe
1977, Nuclear Physics, Section A
The electron-capture decay of ^119mTe was investigated with an iron-free π√2 β-spectrometer and Ge(Li) detectors. The investigation includes subshell-ratio and γγ angular correlation measurements in addition to conversion-coefficient and γγ coincidence measurements. The level scheme of ¹¹⁹Sb was proposed, which incorporates 13 excited states and 34 transitions. The spin-parities were determined as follows: $270.53 keV 72^{+}, 970.91 92^{+}, 1048.42 72^{+}, 1212.75 92^{+}, 1249.78 92^{+}, 1366.32 112^{−}, 1407.21 112^{+}, 2129.83 92^{−}, 2226.02 112^{−}, 2278.87 132^{−}, 2283.78 92^{−}, 2360.22 92^{−} and 2379.61 (92, 132)^{−}$ . The level structure of ₅₁¹¹⁹Sb₆₈ is discussed in comparison with a core-particle coupling calculation. All the levels seen in the decay of ^119mTe are correlated with the theoretical levels except for the 970.91 $92$ ⁺ level, which has been recently identified as a deformed state.
High-spin states in 115Sb
1977, Nuclear Physics, Section A
The level scheme of ¹¹⁵Sb was investigated using the reaction ¹¹³In(α, 2nγ)¹¹⁵Sb. Excitation functions, γ-γ-Δt coincidences, lifetimes, γ-ray angular distributions and conversion electrons were measured. Three isomeric states having $j^{π} = 112^{−}, 192^{−} and 252^{+}$ and half-lives of 6.7(4) ns, 156(3)ns and 4.0(2) ns respectively were identified. A positive parity band based on a $92^{+}$ level was observed. The structure of this band is discussed in terms of a strongly coupled rotational band. To explain the configuration mixing observed in the lowest part of the band, cluster-core coupling calculations were performed.
Level structure in 117Sb investigated in the decay of the isomeric three-quasiparticle state
1975, Nuclear Physics, Section A
The level structure of ¹¹⁷Sb was investigated in the reactions ¹¹⁵In(α, 2nγ)^117mSb, ¹¹⁷Sn(d, 2nγ)^117mSb and ¹¹⁷Sn(p, nγ)^117mSb. In order to confirm level sequences and to assign spins and parities to levels populated in the decay of the isomeric three-particle state $T_{12}$ = 340 μs), prompt and delayed γ-ray spectra, lifetimes, γ-γ coincidences, γ-ray angular distributions, conversion electrons and excitation functions were measured. The spin $252$ ⁺ of the isomeric state can be explained by the three-particle configuration [ $π(d_{52}); v(h_{112})^{2} 10^{+}] 252^{+}$ . This is supported by the experimentally determined g-factor of g = O.115 ± 0.006. Other levels in ¹¹⁷Sb can be interpreted as particle states coupled to anharmonic vibrations of the core. The existence of an excited $92^{+} [404]$ quasirotational band is experimentally proved and is supported by calculations of the equilibrium deformation.
Spins of the levels and multipole mixing ratios of transitions in 125Sb determined from γ-γ directional correlation and polarization-directional correlation measurements
1974, Nuclear Physics, Section A
In order to resolve several discrepancies in spin assignments to levels in ¹²⁵Sb, directional correlations and polarization-directional correlations have been measured for several γ-γ cascades in ¹²⁵Sb populated from the decay of ¹²⁵Sn. Earlier results obtained from using NaI and Ge(Li) and NaI detectors were difficult to interpret due to the complex structure of the decay scheme. To improve the experimental situation, we have used two coaxial Ge(Li) detectors for the angular correlation measurements and a coaxial Ge(Li)-planar Ge(Li) combination for the polarization-directional correlations. Combination of the results of these measurements give unique spin assignments of $112$ ⁻, $112$ ⁻, $92$ ⁺, $112$ ⁺ and $92$ ⁺ to the 1982 keV, 1890 keV, 1420 keV, 1089 keV and 1067 keV levels, respectively. The determined E2/M1 mixing ratios are : δ(470) = 0.010±0.027, δ(1067) = −0.86±0.18, and δ(916) = −0.02±0.01.
Coupling of a three-particle (hole) valence-shell cluster to quadrupole vibrations (Alaga model): The Z = 50 region: odd Ag and I isotopes; and the Z = 28 region: odd Mn and Ga isotopes
1973, Nuclear Physics, Section A
The present approach includes two important physical correlations: the interaction between single-particle degrees of freedom and the vibrational field and the Pauli principle for three particles or holes in the valence shell. No new parameters have been introduced. In this way, both the explicit appearance of broken and promoted pairs and the anharmonicities from the neighbouring doubly even nuclei are accounted for. The model is generally characterized b y the coexistence of quasivibrational and quasirotational features. Typical quasirotational elements are the quasiband pattern and the I = j − 1 anomaly, while a typical quasivibrational element is the multiplet structure. Both features are naturally introduced by the mechanism of the cluster field coupling. Nuclei with Z = 50 ± 3 and Z = 28 ± 3 are qualitatively discussed within the framework of the present approach. A detailed qualitative and quantitative description of the properties of low-lying states (energy spectra, electromagnetic properties, transfer reactions) as well as a comparison with experiment are given for ^{107, 109}Ag, ¹²⁷I, ⁵⁵Mn, and ⁶⁹Ga, which are typical and well-known representatives of odd Ag, I, Mn, and Ga nuclei, respectively.

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Nuclear Physics A

Abstract

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Cited by (24)

A microscopic description of fermion boson interaction

Low-lying states of <sup>119</sup>Sb studied from the decay of <sup>119m</sup>Te

High-spin states in <sup>115</sup>Sb

Level structure in <sup>117</sup>Sb investigated in the decay of the isomeric three-quasiparticle state

Spins of the levels and multipole mixing ratios of transitions in <sup>125</sup>Sb determined from γ-γ directional correlation and polarization-directional correlation measurements

Coupling of a three-particle (hole) valence-shell cluster to quadrupole vibrations (Alaga model): The Z = 50 region: odd Ag and I isotopes; and the Z = 28 region: odd Mn and Ga isotopes