Angular distributions for the 156Gd(d, t)155Gd reaction

doi:10.1016/0375-9474(69)90449-7

Nuclear Physics A

Volume 133, Issue 1, 11 August 1969, Pages 65-76

https://doi.org/10.1016/0375-9474(69)90449-7 Get rights and content

Abstract

The angular distributions for triton groups from the ¹⁵⁶Gd(d, t) reaction have been measured at a deuteron energy of 12.1 MeV. The distributions were compared with similar distributions for the ¹⁶⁰Gd(d, t) reaction which had been measured earlier. On this basis, it was possible to establish or confirm the Nilsson assignments for a number of levels in the ¹⁵⁵Gd nucleus. Special attention was paid to the energy levels at 87 keV (l = 2), 105 keV (doublet l = 2 and l = 4), 119 keV (l = 5) and 214 keV (l = 6) and their relations to the Nilsson model. It is discussed how the strong Coriolis coupling of even parity bands can account for the observed energy levels and neutron transfer cross sections.

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A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei
2010, Nuclear Physics A
We have used the AFRODITE γ-ray spectrometer to measure yrare structures in ^152,154,155Gd using (α,xn) reactions. The measurements on ^152,154Gd have shown that there is no convincing evidence that the lowest excited $0_{2}^{+}$ states are β-vibrations based on the $0_{1}^{+}$ ground state. Rather these levels may be regarded as a “second vacuum” each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core $0_{2}^{+}$ state in ¹⁵⁴Gd to the $[505] 11 / 2^{-}$ single-particle quasi-neutron orbital in ¹⁵⁵Gd. The coupling of this orbital to the $2^{+}$ γ-vibration is observed since this coupling is not Pauli-blocked.
Nuclear data sheets for A = 155
2005, Nuclear Data Sheets
This work represents an update of the previous evaluation of the nuclear data on the A = 155 nuclides (Nucl. Data Sheets 71 (1994) 709). The experimental data from reaction and decay studies leading to these nuclides have been reviewed. The elements included range from Ce (Z = 58) through Ta (Z = 73). These data are summarized and presented, together with the adopted level schemes and properties. In addition, data on the g. s. properties of those A = 159 nuclides whose α decays lead to final states in the A = 155 nuclides have been reconsidered.
Nuclear data sheets for A = 155
1994, Nuclear Data Sheets
Nuclear data sheets for A = 155
1987, Nuclear Data Sheets
The gamma transition from the 5 2 5 2+ [402] state to the 7 2 7 2+ [404) state in 177Ta
1976, Nuclear Physics, Section A
An experimental investigation of the 70.5 keV γ-ray transition from the $52$ $52^{+}$ [402] state to the $72$ $72^{+}$ [404] ground state in ¹⁷⁷Ta was made. The half-life and magnetic moment of the initial state were found to be 73 ± 5 ns and 4.7 ± 0.5 μ_N, respectively. The $E2 M1$ mixing ratio of the transition was determined to be −0.10 ± 0.04. The reduced transition probabilities, B(E2) and B(M1), were found to be 2.9 ± 2.3 e² · fm⁴ and (1.1 ± 0.1) × 10⁻⁴μ²_N, respectively, and the M1 penetration parameter was determined to be 6 ± 2. The Coriolis mixing amplitude of the $72$ $72^{+}$ [402] state in the $72$ $72^{+}$ [404] ground state was determined from the B(E2) value to be −0.011 ± 0.004. It was found that the experimental value of the Coriolis matrix element $〈 52$ ⁺¦J−¦ $72^{+} 〉_{exp}$ was one-tenth of that calculated using the Nilsson wave function. The coefficient k₂, introduced by Wahlborn et al., was-re-analyzed using the present experimental results and found to be less than 0.8.
Nuclear data sheets for A = 155
1975, Nuclear Data Sheets
The present work constitutes an updating of the previous A = 155 data compilation which appeared in the Nuclear Data Sheets in November 1963. All data available prior to August 1974 have been considered for this compilation.
Data are given for 10 nuclides, ¹⁵⁵Sm(Z=62) through ¹⁵⁵Lu(Z=71). The ground-state spins are now well established for the Z=62 through Z=67 members of this A-chain. More recent data on atomic masses have resulted in a change in the Q-value for the ε-decay of ¹⁵⁵Tb from 1 MeV in the earlier compilation to 817 keV. The bulk of the new data has come from single-nucleon transfer reactions and from semiconductor-detector studies of γ-rays from radioactive decay and charged-particle-induced reactions. The results have given a much more complete picture of the energy-level structure of these nuclei. ¹⁵⁵Sm, ¹⁵⁵Eu, ¹⁵⁵Gd, and ¹⁵⁵Tb are classified as deformed nuclei since they all exhibit well-developed rotational-band structure. The energy-level systematics of these nuclei are treated in terms of the Nilsson model including various well-established couplings. The N=89 nuclide, ¹⁵⁵Dy, also exhibits rotational-band structure. However, since it is situated in a mass region where a transition from a deformed to a spherical equilibrium shape is found, the configuration assignments for the observed energy levels are somewhat tentative.
Absolute β⁻-, γ(+cc)-, and ε(+β⁺)-branching ratios are given on the decay-scheme drawings. In all cases these quantities are based on a (γ+ce) intensity balance normalized to 100% decay to the ground state of the daughter nucleus. Specific details concerning the methods used to estimate the β- or ε-branching to the ground state of the daughter nucleus are discussed in connection with the individual nuclides.

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Nuclear Physics A

Abstract

References (9)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Cited by (20)

A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei

Nuclear data sheets for A = 155

Nuclear data sheets for A = 155

Nuclear data sheets for A = 155

The gamma transition from the 5 2 5 2<sup>+</sup> [402] state to the 7 2 7 2<sup>+</sup> [404) state in <sup>177</sup>Ta

Nuclear data sheets for A = 155