g-Factor of theT 1/2=35 ns isomeric state in154Er

Nguyen, Lan-Anh T.; Sergolle, H.; Aguer, P.; Auger, G.; Bastin, GF Giel; Lönnroth, T.; Thibaud, J. P.; Thomé, L.

doi:10.1007/bf01413751

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Cranked-Shell Model calculations are able to reproduce the experimental yrast line [11]. The isomeric states found in these nuclei, as well as measurements of half lives and g-factors [12][13][14], confirm on the whole the dominant quasi-particle structure of the states in the discrete yrast sequence, even if an interplay between single-particle and coherent excitation of several nucleons is likely to be involved in the high-spin region of N =84-86 isotopes.…”

Section: Introductionmentioning

confidence: 68%

Decay properties of very-high-spin states in transitional Er nuclei aroundA=154

Bogaert

Aguer

Bastin

et al. 1986

Z. Physik A - Atomic Nuclei

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The 7 ray continuum structures of the transitional Er isotopes with A ~ 154 are studied using the reaction 74Ge(8r xn) lS8-XEr at El, b = 340 MeV. The measurements include energy spectra, total energies, multiplicities, angular distributions and lifetimes using the DSAM method. The analysis of data confirms the previously observed two-bump structure of the continuum radiation. A meticulous subtraction of discrete contributions proves the persistence of the low-energy bump even at high spins, i.e. I>40 h. The angular -distribution measurements assign predominant dipole structure to the bump at E~ =0.65 MeV, whereas the bump at E~ = 1.3 MeV is of almost pure quadrupole character at high spins. The lifetime measurements give evidence for a strong enhancement of the B(E2) values of the upper bump, B(E2)/Bsp>130. Spin-selection studies reveal, in the spin range I=30-50h an almost constant energy for the 1.3MeV bump, AE<60 keV.

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Section: Introductionmentioning

confidence: 68%

Decay properties of very-high-spin states in transitional Er nuclei aroundA=154

Bogaert

Aguer

Bastin

et al. 1986

Z. Physik A - Atomic Nuclei

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“…They were found to have almost same excitation energies. The small magnitude of the g factor of the isomeric state in 154 Er, measured by the Nguyen et al [23] and Rafailovich et al [24], respectively, suggested that the main configuration of its wave function is the two neutron quasiparticle excitation v(i 13/2 , h 9/2 ). Built on the J π = 11 − isomer in 156 Yb, an odd-spin negative-parity cascade up to spins 25 − at 7405 keV was found in Ref.…”

Section: Resultsmentioning

confidence: 96%

High-spin states inYb156and structure evolutions at large angular momenta in even-AYb isotopes

Li¹,

Hua²,

Wang³

et al. 2008

Phys. Rev. C

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High-spin states of 156 Yb have been studied via the 144 Sm( 16 O,4n) 156 Yb fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. In the present work, the negative-parity sequence above the 25 − state was found to be irregular and fragment into many parallel branches. This pattern may related to the excitation from the nucleon in the Z = 64, N = 82 core. The characteristics of alignment plot and E-GOS curve for the positive-parity yrast sequence in 156 Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. Based on a systematic summary of the available experimental alignments for the even-A 156,158,160,162,164 Yb isotopes, the structural evolutions induced by the increase in angular momentum, as well as by the change in neutron numbers, in these even-A Yb isotopes have been discussed in comparison with the cranked Woods-Saxon-Strutinsky calculations by means of total-Routhian-surface (TRS) methods.

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“…The present discussion will be concentrated on the decay scheme above the U= 11-isomer whose spin and v(h9/2, i13/z ) configuration have been suggested by a recent g-factor measurement [9]. The presence of this type of isomer seems to be a significant property of the N= 86 configurations.…”

Section: Discrete Spectrum Of Ls4er; Interpretation Of the Datamentioning

confidence: 94%

“…We used enriched (>98~o) targets of l mg/cm 2 thickness evaporated onto 0.1 mmPb backings. The decay scheme of 154Er is known to exhibit a long lived high spin isomer T1/2=35ns, at about 3 MeV excitation energy [9]. We have taken advantage of this isomer in order to select prompt y-rays from the 4n exit channel by using a pulsed beam (FWHM~3ns and repetition rate 400ns) and a "timing filter" array of NaI counters.…”

Section: I Experimental Proceduresmentioning

confidence: 99%

“…was very unusual and this has led Ward et al [7] to question its E2 character. In view of the discrepancies we have reinvestigated the decay scheme and multipolarities of the y-ray transitions above the IX=l l-isomer [9] using variety of experimental techniques including excitation function, 7-7 coincidence, angular distribution and linear polarization measurements. Special care was taken to identify the lS4Er evaporation residues in order to reject y-ray transitions which belong to neighbouring nuclei.…”

Section: Introductionmentioning

confidence: 99%

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High-spin structure in154Er

Beck¹,

Dudek²,

Haas³

et al. 1984

Z Physik A

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High spin states in the nucleus lS4Er have been reinvestigated using the *23Sb(asc1, 4n) reaction and a variety of spectroscopic techniques including excitation functions, 7-7 coincidences, 7 angular distribution and linear polarization measurements. From the measured energies, relative intensities and transition multipolarities a new level scheme has been deduced up to an excitation energy of ~ 12 MeV and spin 36. An interpretation of the experimental results is given in terms of the deformed Woods-Saxon orbitals. Gigantic backbending (superdeformation) effect is studied theoretically within the cranking model.

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g-Factor of theT 1/2=35 ns isomeric state in154Er

Cited by 10 publications

References 18 publications

Decay properties of very-high-spin states in transitional Er nuclei aroundA=154

Decay properties of very-high-spin states in transitional Er nuclei aroundA=154

High-spin states inYb156and structure evolutions at large angular momenta in even-AYb isotopes

High-spin structure in154Er

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