258 research outputs found
Lifetime measurements in (182),(186)Pt
No full textLifetimes in the yrast bands of the nuclei ¹⁸²,¹⁸⁶Pt have been measured using the Doppler-shift recoil distance technique. The results in both cases—a sharp increase in B(E2) values at very low spins—may be interpreted as resulting from a mixing between two bands of different quadrupole deformations.J. C. Walpe, U. Garg, S. Naguleswaran and J. Wei, W. Reviol, I. Ahmad, M. P. Carpenter, and T. L. Kho
Spinpraezession in "1"5"8","1"6"0","1"6"2Yb bei hohen Drehimpulsen
No full textSIGLETIB Hannover: DR 7952 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Proton excitations in the superdeformed well of 193Tl
No full textTwo superdeformed bands of 13 transitions each have been found in 93T1 with the 60Gd (37Cl, 4n) reaction. The dynamic moments of inertia for the two bands are found to rise with rotational frequency, as for all observed superdeformed bands in other nuclei in this region. The two bands can be interpreted as signature partners which exhibit some signature splitting for rotational frequencies above 0.2 MeV. The data are interpreted with cranked Woods-Saxon calculations and illustrate the role of the proton i13/2 (Omega = 5/2) intruder orbital
Structure of high-spin states in Sr-91 and Sr-92
No full textThe nuclei Sr-91 and Sr-92 were produced at high spin as fission fragments following the fusion reaction S-36+Tb-159 at 165 MeV. gamma rays were detected with the Gammasphere array. The level schemes of Sr-91 and Sr-92 were extended up to Eapproximate to6 MeV and Eapproximate to8 MeV, respectively. Level structures in Sr-91 and Sr-92 were interpreted in shell-model calculations performed in the configuration space (0f(5/2), 1p(3/2), 1p(1/2), 0g(9/2)) for the protons and (1p(1/2), 0g(9/2), 1d(5/2)) for the neutrons. Negative-parity states in the yrast sequences are described in these calculations by coupling 3(-) proton excitations to the unpaired 1d(5/2) neutrons. A possible reduction of the gap between the proton 1p(3/2) and 1p(1/2) orbitals in Sr-92 is discussed
Double blocking in the superdeformed Tl192 nucleus
No full textSix superdeformed bands have been found in the nucleus 192Tl. For two of the bands, the dynamic moment of inertia J(2) is found to be constant with the rotational frequency ħω. This result can be understood in terms of Pauli blocking of quasiparticle alignments in intruder orbitals, and represents strong experimental evidence that the alignment of these intruders is responsible for the smooth rise in J(2) seen in other superdeformed nuclei of this mass region
Low-spin structure of the N=82 nucleus Cs 137
No full textExcited states in Cs137 have been studied by using the near-barrier, single-proton transfer reaction B10(Xe136,Be9γ)Cs137 in inverse kinematics and performing particle-γ and particle-γγ coincidence measurements. The low-spin level scheme of Cs137 has been augmented: (i) The expected set of single-proton, seniority υ=1 states has been delineated in its entirety; (ii) Another member of the υ=3 proton 0g7/2 multiplet, a low-lying 9/2+ level, has been identified and this set of states now approaches completion; (iii) A second 9/2+ and a candidate 13/2+ level have been observed. The results are discussed in the framework of shell-model calculations in the proton 2s1d0g0h shell
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Electromagnetic properties of {sup 181}Ir: Evidence of {beta}-stretching?
No full textWe have calculated the B(Ml)/B(E2) ratios in {sup 18l}Ir within a shape-fixed particle + rotor model, in order to investigate how sensitive these may be to the nuclear shapes under consideration, and whether or not there is evidence of shape coexistence in the electromagnetic data alone. The model calculations employed the same Woods-Saxon potential that has been used previously for TRS and bandhead calculations and all parameters have been taken at their standard values, without any adjustments. To the extent possible with present models, these calculations should represent predictions for the B(M1)/B(E2) ratios at the deformations expected from the TRS and bandhead calculations. A comparison with the {sup 181}Ir data is stimulated by the fact that this is the lightest-mass Ir nucleus for which the spins and parities am firmly established experimentally; we find that the electromagnetic transition rates in this nucleus are well reproduced under the assumption of a single, fixed shape
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Superdeformed shapes and configurations in thallium nuclei
No full textSuperdeformation studies in {sup 189,191,192}Tl at Gammasphere are discussed. New results on {sup 191}Tl are the observation of interband transitions between the signature partner E2 bands and the measurement of an average quadrupole moment (Q{sub 0} = 18 {+-} 1 eb) for these superdeformed structures. These data enable them to derive absolute M1 strengths and confirm that the 81st proton occupies the [642]5/2 orbital. Tentative data for one superdeformed sequence in {sup 189}Tl are consistent with the prediction of a decrease in quadrupole deformation for the lightest nuclei at the limit of this island of superdeformation
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