Zerfall des 162Tb

doi:10.1016/0375-9474(68)90188-7

Nuclear Physics A

Volume 118, Issue 1, 30 September 1968, Pages 78-96

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Abstract

The beta and gamma radiations of ¹⁶²Tb have been investigated employing scintillation and semiconductor spectrometers and coincidence techniques. Sources were produced by the ¹⁶²Dy(n, p) and ¹⁶⁵Ho(n, α) reactions. A half-life of 7.6 min has been measured without evidence for an isomeric state in the half-life range of 2 sec to 8 d. The energies (in keV) and relative intensities (in parentheses) of the gamma rays are 81 (≈ 9), 185 (complex, 17+3.3), 260 (100), 622(1.2), 697(3.0), 807(57), 882(15), 888(50), 1067(0.8), 1194(0.13) and 1275(0.11). Beta-decay branches of 2.4 MeV (≈ 0.4%, log ft=8.3), 1.5% (≈ 5%, 6.4), 1.25 (94%, 4.8) and 1.1 (0.2%, 7.2) have been found, the 2.4 MeV branch leads to the ground state of ¹⁶²Dy. A spin and parity of 1⁻ is deduced for the ground state of ¹⁶²Tb. Levels of ¹⁶²Dy at 81, 266, 888, 963, 1148 and 1275 keV are populated in the decay of ¹⁶²Tb. The first four levels belong to the ground state and to the gamma-vibrational band. The level at 1148 keV is interpreted as a K, I^π = 2, 2⁻ state with a high contribution of the two-proton quasi-particle state [411↑-523↑], the level at 1275 keV as a collective 0, 1⁻ state.

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Nuclear Data Sheets for A = 162
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The experimental results from the various reaction and radioactive decay studies leading to nuclides in the A = 162 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties, for the nuclides from Sm (Z = 62) through Os (Z = 76). This represents an update of the previous evaluation of the nuclear data on the A = 162 nuclides (1999He21).
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1977, Nuclear Physics, Section A
The decay of 7.76 min ¹⁶²Tb has been studied with Ge(Li), NaI(Tl) and plastic detectors in singles and coincidence measurements. Sources were prepared using the ¹⁶³Dy(γ, p) reaction. A total of 47 γ-ray transitions, 35 of them not reported before, have been observed and 40 transitions are incorporated in a level scheme comprising 17 excited states of ¹⁶²Dy. A spin-parity assignment of 1⁻ is confirmed for the ground state of ¹⁶²Tb. Levels at 1745.5 and 1782.6 keV are assigned as the 1⁺ and 2⁺ states of the 1⁺ {n[521]↑-n[523]↓} band, respectively. Gamma-ray branching ratios favor K = 0 for the 1⁻ state at 1275.8 keV and K = 1 for the 3⁻ state at 1357.8 keV. A value of z₂ = 0.0355 ± 0.0021 is deduced for transitions between the γ-band and the ground-state band in ¹⁶²Dy.
Nuclear data sheets for A = 162
1976, Nuclear Data Sheets
Systematics of excitation functions for fast neutron induced (n,p)- and (n,α)-reactions
1972, Journal of Inorganic and Nuclear Chemistry
The systematics of excitation functions for (n,p)- and (n,α)-reactions were investigated. The dependence of the position and value of the maximum cross-section, the half-width and an “asymmetry factor” on the charge number of the target material were evaluated from published data. Using these relationships, a procedure was developed for the construction of unknown excitation functions. To check this procedure, the activities produced by (n,p)-reactions with ²⁷Al, ⁵¹V, ⁵⁹Co, ⁷⁵As and ¹⁰³Rh, and by (n,α)-reactions with ⁵¹V, ⁷⁵As, ¹³³Cs and ¹⁶⁵Ho, were experimentally determined. The neutrons were obtained by bombarding a thick Be converter with 33 MeV and 53 MeV deuterons. Only for As do the determined activities deviate appreciably (by about a factor of two) from the values calculated with the aid of the calculated excitation functions. In all other cases the agreement was within 35 per cent.

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¹: Wir danken Professor F. Strassmann für die großzügige Förderung dieser Arbeit, Dr. P. Patzelt, Dr. G. Luthardt und H. Herter für zahlreiche Bestrahlungen mit 14 MeV Neutronen, Professor H. von Buttlar und Dr. H. Franke für Aktivierungen mit Bremsstrahlung und U. Tharun für seine Mitarbeit. Dem Bundesministerium für wissenschaftliche Forschung sind wir für finanzielle Beihilfen dankbar.

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Zerfall des 162Tb

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Nucl. Instr.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

UCRL-3950

J. Phys. Soc. Japan

J. Inorg. Nucl. Chem.

Zerfall des ¹⁶²Tb