Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line

Vierinen, K.; Nitschke, J. M.; Wilmarth, P.A.; Firestone, R. B.; Gilat, J.

doi:10.1016/0375-9474(89)90266-2

Cited by 22 publications

(6 citation statements)

References 16 publications

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“…d A level at 1384 keV was proposed in Ref. [18] based on depopulating transitions of 594.7 and 1384.0 keV. In the present work we find no evidence for these transitions; however, a 1089-keV transition in coincidence with only the 294.…”

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confidence: 48%

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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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confidence: 48%

“…[14,15,18], with the adopted data [16] based mainly on Ref. [18]. The decay of 134 Pm occurs through the (2 + ) ground state (T 1/2 ∼ 5 s) and a (5 + ) isomer (T 1/2 ∼ 22 s).…”

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βdecay spectroscopy of light Nd isotopes

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“…130 130 Sm in the 1999 paper "Fine structure in the decay of highly deformed proton emitter 131 Eu" [18]. A 58 Ni target was bombarded with a 402 MeV 78 Kr beam from the ATLAS accelerator facility and 140 Sm was populated following the proton decay of the fusion-evaporation product 131 Eu. The recoil products were separated with the Argonne Fragment Mass Analyzer and stopped in a double-sided silicon strip detector.…”

Section: Smmentioning

confidence: 99%

“…The 2004 paper "Proton decay of the highly deformed odd-odd nucleus 130 Eu" by Davids et al reported the discovery of 130 Eu [55]. A 58 Ni target was bombarded with a 432 MeV 78 Kr beam from the Argonne ATLAS accelerator system and 130 Eu was formed in the fusion evaporation reaction 58 Ni( 78 Kr,p5n). Reaction products were separated with the Fragment Mass Analyzer and implanted in a double-sided silicon strip detector where subsequent protons were recorded.…”

Section: Discovery Of 130−165 Eumentioning

confidence: 99%