Evidence for a 3.6 minute isomeric 12? state of the ?h 11 2/?1 vi 13 2/?1 configuration in206Tl and effective two-particle interactions

Bergström, I.; Blomqvist, J.; Herrlander, C.J.; Lindén, C.G.

doi:10.1007/bf01409176

Cited by 16 publications

(1 citation statement)

References 15 publications

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“…(17) (7) (17) The relative yield of y-rays produced in the 2~ xn) reactions were recorded in the energy interval 42-51 MeV for the purpose of sorting out those ~-rays which were due to transitions in 2~ 2~ and 2~ Furthermore, for each reaction channel the excitation functions tell approximately where the 7-rays lie in the yrast cascade (cf. Fig.…”

Section: Excited States In 2~mentioning

confidence: 99%

On the yrast levels in204Pb

Lindén¹,

Bergström²,

Blomqvist³

et al. 1978

Z Physik A

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High-spin states in 2~were populated in the 2~ 4n) reaction using e-particles in the energy region 42-51 MeV. Prompt and delayed y-rays as well as conversion electrons were studied in addition to excitation functions, angular distributions and 7-7 coincidences. In this way a stretched cascade of y-rays from a level at 8125.9 keV was found to feed the previously known isomeric 9-level at 2185.7 keV. Spins and parities were established for levels up to and including a 19-level at 6098.0 keV. The levels with J== 17-and 19-at excitation energies of 5664.3 and 6098.0 keV are likely to be due to the simple p~/1 i~z and f5721 ii-~2 configurations. The agreement between calculated and experimental energies for all observed levels in the region J=9-19 is very good in cases where the empirical two-particle interactions used are satisfactorily well known. Above the 19-level there are three weakly populated levels at 7402.1, 7849.2 and 8125.9 keV, which are likely to have J > 20. None of these energies agrees with the calculated value 7695 +20 keV for the 20 + state of the ila~2 configuration which has the highest angular momentum produced by the four valence neutron holes. This apparent anomaly can be understood if the yrast levels with J > 20 have angular momentum contribution from the core. It seems likely that the states at 7402.1, 7849.2 and 8125.9 keV are due to proton core excited states of the type Irh9/2 h11~/zXVp~/2 i1~/2 with J==20 + and J==21 + and =h9/2 h;11/2 x vpT/1 f57~ i~32/2 with J==22 + or 23 +, respectively. The state at 8126keV has the highest energy so far directly observed in a stretched cascade of y-rays from the decay of a heavy nucleus produced in (e, x n) reactions.

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Section: Excited States In 2~mentioning

confidence: 99%

On the yrast levels in204Pb

Lindén¹,

Bergström²,

Blomqvist³

et al. 1978

Z Physik A

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Multiparticle- and particle x octupole states in 65 149 Tb84

Lach

Kleinheinz

Piiparinen

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Yrast-and above-yrast states in 149Tb were investigated in (c~, 6n) and (TLi, 2n) in-beam 7-ray experiments. The yrast 7-ray cascade strongly populates three-valenceparticle states involving the hx 1/2 proton and the f7/2, h9/z, or i13/2 neutron orbitals, as well as the high-spin levels formed by the couplings of the three 149Tb valence particles, to the low-lying 146Gd octupole phonon and to higher-lying proton particle-hole core excitations. The data give the (~ h 11/2 v i13/2)12 -attraction free of octupole contributions as -631 keV. The shell model with empirical two-particle-and particle-phonon residual interactions gives an excellent quantitative description of the 149Tb energy levels. It is noted that the observed highspin members of the 7chll/2vh9/zvfT/2 configuration closely resemble the lowest symmetric and mixed-symmetry representations of the $3 permutation group.

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Excitation of 12? isomeric state of206Tl by fast neutrons

et al. 1978

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The 12-isomeric state of 2~ formerly produced by charged particles, was produced in 14 MeV neutron induced (n, e) reaction on Bi. An intensity balance was deduced from known gamma lines and several new weak gamma lines were observed. Theoretical considerations on the production probability of the isomeric state and on some intensity ratios are given. The half-life of the isomeric state was determined in good agreement with former measurements.

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Evidence for a 3.6 minute isomeric 12? state of the ?h 11 2/?1 vi 13 2/?1 configuration in206Tl and effective two-particle interactions

Cited by 16 publications

References 15 publications

On the yrast levels in204Pb

On the yrast levels in204Pb

Multiparticle- and particle x octupole states in 65 149 Tb84

Excitation of 12? isomeric state of206Tl by fast neutrons

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