Non-yrast states of Ce populated in -decay

Gade, A.; Wiedenhöver, I.; Luig, M.; Gelberg, A.; Meise, H.; Pietralla, N.; Werner, V.; Brentano, P. von

doi:10.1016/s0375-9474(00)00127-5

Cited by 29 publications

(9 citation statements)

References 22 publications

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“…Possible 5 − , 7 − , and 6 − values have been suggested for its spin-parity in Refs. [41][42][43]. The energy difference between the two isomers was unknown up to the present experiment.…”

Section: A Low-and Medium-spin Negative-parity Bandsmentioning

confidence: 78%

Medium- and high-spin band structure of the chiral-candidate nucleus134Pr

et al. 2011

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Medium-and high-spin states of 134 Pr were populated using the 116 Cd( 23 Na, 5n) reaction and studied with the GAMMASPHERE spectrometer. Several new bands have been found in this nucleus, one of them being linked to the previously observed chiral-candidate twin-band structure. The ground state of 134 Pr could be determined through establishing a level structure that connects the two previously known long-lived isomeric states. Unambiguous spin-parity assignments for the excited states could be performed based on the known 2 − spin-parity of the ground state combined with the present experimental data. Intrinsic single-particle configurations have been assigned to the newly observed bands on the basis of the measured B(M1)/B(E2) ratios, alignments, band-crossing frequencies, bandhead spins, the observed single-particle configurations in the neighboring nuclei, and taking into account the predictions of total Routhian surface and tilted-axis cranking calculations.

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Section: A Low-and Medium-spin Negative-parity Bandsmentioning

confidence: 78%

Medium- and high-spin band structure of the chiral-candidate nucleus134Pr

et al. 2011

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“…[1,2,3,4,5]). Along with these studies, many low-lying non-yrast states have also been investigated in the β-decay spectroscopic methods [6] and Coulomb excitations of stable as well as radioactive ions [7,8,9]. Nuclei in this mass region depict a variety of band structures which are built on different excitation modes.…”

Section: Introductionmentioning

confidence: 99%

Multi-quasiparticle γ-band structure in neutron-deficient Ce and Nd isotopes

et al. 2009

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The newly developed multi-quasiparticle triaxial projected shell-model approach is employed to study the high-spin band structures in neutron-deficient even-even Ce-and Nd-isotopes. It is observed that γ-bands are built on each intrinsic configuration of the triaxial mean-field deformation. Due to the fact that a triaxial configuration is a superposition of several K-states, the projection from these states results in several low-lying bands originating from the same intrinsic configuration. This generalizes the well-known concept of the surface γ-oscillation in deformed nuclei based on the ground-state to γ-bands built on multi-quasiparticle configurations. This new feature provides an alternative explanation on the observation of two I = 10 aligning states in 134 Ce and both exhibiting a neutron character.

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“…A level at 1089 keV was reported [16] on the basis of two depopulating transitions to the 2 (12) 100 (11) 6 + 1420.56 (7) 631.32(6) 9.6(7) 100 (7) (8) 11.4(18) 516.11 (9) 4.4(3) 100 (7) 100 ( (2) 68(10) 880.51 (7) 1.9(2) 100(11) (5 + ) 1697.79(9) 908.6(1)…”

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confidence: 99%

βdecay spectroscopy of light Nd isotopes

et al. 2013

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Excited states in 132,134 Nd were populated in the β + / decay of 132,134 Pm and studied through off-beam γ -ray spectroscopy. Level spins and multipole mixing ratios of transitions were determined through an angular correlation analysis. In 132 Nd, a new excited 0 + state is identified and in 134 Nd the level scheme is significantly extended. Differences in the location of the 0 + 2 state and the γ bandhead above and below N = 82 suggest that the lighter isotopes are much more γ -soft than the heavier Nd and that a first-order phase transitional description is not applicable in the N < 82 region. In the rare-earth region for nuclei around N = 90, there has been considerable discussion concerning the structural interpretation. Interest in this region blossomed with the concept that the N = 90 nuclei exhibited a specific type of phase transitional behavior [1][2][3][4] described by the X(5) model [5]. In subsequent works [6][7][8] alternative interpretations involving more generalized shape coexistence models have been argued. Regardless of the origin of the observed properties, it is clear that the N = 90 nuclei exhibit an intriguing and unique structure. An interesting question is whether or not such features are exhibited by nuclei below N = 82. The N < 82 region has significantly less known information on nonyrast levels, due to the difficulty in populating these states with the heavy-ion reactions needed to produce such highly proton-rich nuclei. Based on yrast band energies, the light Nd and Sm nuclei have been proposed [9] to exhibit a structure similar to an axially symmetric deformed rotor. Later lifetime measurements [10] demonstrated that it was difficult to distinguish between an axially symmetric or γ -soft deformed potential based on yrast band properties alone. A more recent work [11], focusing on the search for phase transitional behavior in 130 Ce, revealed substantial disagreements from an X(5) description, possibly originating from a soft-potential in the γ degree of freedom.The purpose of this Brief Report is to explore the protonrich Nd nuclei in the region where phase transitional behavior can be investigated. The N = 90 neodymium isotope is 150 Nd with eight valence neutrons. Consequently, the analogous isotope below N = 82 is 134 Nd. It is well known [9] that the onset of deformation is more gradual for the N < 82 isotopes compared with those above N = 82. To determine what similarities exist, if any, with their N > 82 counterparts, β decay was used to populate nonyrast states in 132 Nd and 134 Nd.The parent nuclei were produced by bombarding a ∼4 mg/cm 2 92 Mo target with a 1-pnA, 230-MeV 46 Ti beam provided by the Yale ESTU tandem accelerator. The target was backed by a 10 mg/cm 2 Au foil to stop all recoiling nuclei. The experiment was performed with a beam-on/beam-off cycle of 10-s intervals. In the beam-off cycle, γ rays were detected using eight Compton-suppressed clover HPGe detectors. Both γ -ray singles (5 h) and γ -γ coincidence (70 h) data were acquired. The energy range cov...

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Non-yrast states of Ce populated in -decay

Cited by 29 publications

References 22 publications

Medium- and high-spin band structure of the chiral-candidate nucleus134Pr

Medium- and high-spin band structure of the chiral-candidate nucleus134Pr

Multi-quasiparticle γ-band structure in neutron-deficient Ce and Nd isotopes

βdecay spectroscopy of light Nd isotopes

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