Collective states fed by weak α-transltions in the 232U chain

Kurcewicz, W.; Kaffrell, Ν.; Trautmann, Ν.; Płochocki, A.; ȧylicz, J.; Matul, M.; Stryczniewicz, K.

doi:10.1016/0375-9474(77)90516-4

Cited by 60 publications

(12 citation statements)

References 25 publications

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“…In contrast, for 218Ra (N=130) no high spin isomers have been found, and strong El-transitions compete with E2-transitions down to spin 4 [3,8]. However, the failure to observe experimentally the two phonon 0+-states in z22-Z26Ra [22][23][24] contradicts the assumption of harmonic octupole vibration in these nuclei. Calculations of Neerg~rd and Vogel [21], treating the low lying negative parity states of even A quadrupole deformed nuclei in terms of octupole vibrational bands have supported this interpretation very much.…”

Section: Introductionmentioning

confidence: 94%

Excited states in neutron deficient even-even thorium isotopes (218?A?222)

et al. 1985

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The nuclei 218,220,222Th were investigated by conversion electron and y-ray spectroscopy after compound nucleus reactions of a4N with 2~ and 26'180 with 2~ The intense y-background from fission was suppressed by spectroscopy of conversion electrons and y-rays in coincidence with the evaporation residues or their e-decay. Level schemes were determined for 218Th up to U=10 + and for 22~ and 222Th up to U =15-. The observed structure of 218Th may be explained in the spherical shell model with residual interaction by two neutron excitation. For N>130 completely different level schemes are observed showing very intense, collective electric dipole transitions (B(E1)_~ 10 -2 W.u.) with energies of typically 200 keV. Interpretation in terms of stable octupole deformations of the ground state as well as in an cz-cluster picture are discussed.

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Section: Introductionmentioning

confidence: 94%

Excited states in neutron deficient even-even thorium isotopes (218?A?222)

et al. 1985

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“…Results on the β decays [211][212][213] Tl → 211-213 Pb, 215 Pb → 215 Bi, and [215][216][217][218][219] Bi → 215-219 Po are presented and discussed here. Earlier investigations on some of the cited nuclei exploited deep-inelastic [17] and transfer [18,19] reactions, α decay [2,[20][21][22][23][24], and β decay [9,10,[12][13][14]25]. In particular, this work reports on the first spectroscopic information on 213 Pb and 219 Po.…”

Section: Introductionmentioning

confidence: 99%

β-decay studies of neutron-rich Tl, Pb, and Bi isotopes

Morales¹,

Benzoni²,

Gottardo³

et al. 2014

Phys. Rev. C

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The fragmentation of relativistic uranium projectiles has been exploited at the Gesellschaft für Schwerionenforschung laboratory to investigate the β decay of neutron-rich nuclei just beyond 208 Pb. This paper reports on β-delayed γ decays of [211][212][213] Tl, 215 Pb, and 215-219 Bi de-exciting states in the daughters 211-213 Pb, 215 Bi, and 215-219 Po. The resulting partial level schemes, proposed with the help of systematics and shell-model calculations, are presented. The role of allowed Gamow-Teller and first-forbidden β transitions in this mass region is discussed.

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“…2 + , 0 , 1 and 2 has been studied in [9]. The authors of [15] have doubts about the interpretation of the first K ~=0-states in the Ra and Th isotopes as one-phonon states from non-observation of the two-phonon 0 § states at twice one-phonon energy. The inclusion of the isovector multipole forces besides the isoscalar ones [10] has not changed these results.…”

Section: Introductionmentioning

confidence: 99%

On collective two-phonon states in deformed nuclei

Soloviev

Shirikova

1981

Z Physik A

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The centroid energies of the two-phonon states in doubly even deformed nuclei are calculated within the quasiparticle-phonon nuclear model taking into account the Pauli principle in the two-phonon components of the wave functions. It is shown that the collective two-phonon energies are shifted by t-2 MeV to higher energies due to the Pauli principle. A strong fragmentation of the two-phonon collective states over many nuclear levels occurs at the excitation energies of 3-4MeV. It is concluded that the two-phonon states cannot exist in deformed nuclei. The analysis of the available experimental data on the two-phonon states shows that the experimental data do not contradict the results of these calculations.

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Collective states fed by weak α-transltions in the 232U chain

Cited by 60 publications

References 25 publications

Excited states in neutron deficient even-even thorium isotopes (218?A?222)

Excited states in neutron deficient even-even thorium isotopes (218?A?222)

β-decay studies of neutron-rich Tl, Pb, and Bi isotopes

On collective two-phonon states in deformed nuclei

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