Beta Decay of151Pr into Levels in151Nd

Shibata, M.; Ikuta, T.; Taniguchi, Atsuhiko; Osa, A.; Tanaka, Akihiko; Yamamoto, Hiroshi; Kawade, K.; Ruan, Juanfang; Kawase, Y.; Okano, Keiichi

doi:10.1143/jpsj.63.3263

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…First, the 35.1-keV Ce peak count was obtained after subtracting the contribution from the 35.2-keV Pr g ray. The 35.2-keV Pr peak count was evaluated from the experimental 22.5-keV Pr g-ray counts and from their intensities reported by Shibata et al [7]: I g ¼ 12.8(13) for the 35.2-keV and I g ¼ 8:3ð6Þ for the 22.5-keV Pr g ray. The intensity ratio of the 35.1-keV Ce to the doublet counts, R ¼ IðCeÞ=ðIðCeÞ þ IðPrÞÞ, was found to be 48(14)%.…”

Section: Article In Pressmentioning

confidence: 99%

“…Hoellinger et al [9] proposed the spin and the parity I p of 5=2 þ for the ground state on the basis of a level spacing of the rotational band observed in 151 Ce. For 151 Pr, I p ¼ ð3=2Þ À was assigned to the ground state from the experimental log ft values [7]. Thus, a b À decay from 151 Ce to the ground state of 151 Pr is the first forbidden non-unique transition.…”

Section: Log-ft Valuesmentioning

confidence: 99%

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Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Kojima

Shibata

Taniguchi

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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Decay studies on 151 Ce have been performed using the on-line isotope separator connected to the Kyoto University Reactor. In addition to conventional g and conversion electron spectroscopy, b-gated measurements were carried out on mass-separated 151 Ce to identify an isomeric transition. From the analysis of the obtained data, the half-life of the isotope was ascertained to be 1.76(6) s and a decay scheme containing six excited levels was constructed for the first time. The excited level at 35.1 keV in 151 Pr was found to be a longlived state (a half-life of approximately 10 ms or longer).

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Section: Article In Pressmentioning

confidence: 99%

Section: Log-ft Valuesmentioning

confidence: 99%

Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Kojima

Shibata

Taniguchi

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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“…As shown in figure 3(b), the spin-parity of 7/2 + was tentatively proposed for 151m Pr from a small log f t value to this level [10]. Note, this evaluation was based on the spin-parity assignment of (5/2 + ) for the ground state of 151 Ce [14], that of (3/2) − for 151 Pr [15], and β-feeding intensities to excited levels in 151 Pr observed in our work. It is apparent that the half-life of this isomeric state is longer than ∼10 µs because the 35-keV γ-ray is not coincident with β rays.…”

Section: M Prmentioning

confidence: 96%

Search for isomeric transitions in fission products around mass number 150

Kojima

Shibata

Taniguchi

et al. 2007

Nd2007

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Abstract.A β-gated γ-ray and internal conversion electron measurement system for identifying isomers has been installed to the isotope separator on-line at the Kyoto University Research Reactor. On-line measurements for mass number A = 93 nuclides clearly showed that it had sufficient ability to distinguish isomeric transitions from those following β-decay. Using this equipment, an isomeric state in 148 Pr was successfully observed at 76.8 keV, and one in 151 Pr at 35.1 keV. We also found a candidate of an isomeric transition in an A = 150 nuclide produced by the thermal neutron-induced fission of 235 U.

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“…The nucleus 151 Pr has previously been assigned a ground-state spin and parity of (3/2 − ), from β-decay studies [37]. The calculations predict that the lowestlying negative-parity state has a spin of 3/2 − , with a strong π3/2 − [541] component.…”

Section: Quasi-particle-rotor Model Calculations and State Intermentioning

confidence: 99%

Near-yrast structure of odd-A, neutron-rich Pr isotopes

et al. 2012

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The neutron-rich praseodymium isotopes 151 Pr and 153 Pr have been studied by prompt γ-ray spectroscopy using 248 Cm and 252 Cf spontaneous-fission sources placed inside the EUROGAM-II and Gammasphere germanium arrays, respectively. Rotational bands, based on 3/2 − [541] states, with similar structures, have been assigned to these nuclei. These bands decay by intraband E2 transitions. Interband E1 transitions, reported in other works, were not observed. Delayed conversionelectron and γ-ray spectroscopy of an A = 151 nucleus has been performed at the Lohengrin mass spectrometer. A previously reported 35.1-keV isomer of 151 Pr has been determined to decay by an E1 transition and its half-life of 50(8) µs measured for the first time. Calculations performed using a reflection-symmetric quasi-particle-rotor model successfully reproduce the energies of the excited states of these nuclei and their decay patterns. The spin of the isomer has been assigned to be (1/2 + , 3/2 + ) from a comparison with the calculations. The long half life of this isomer and the lack of intraband E1 transitions show an absence of strong octupole correlations in the observed states of 151,153 Pr. This is explained in terms of increasing quadrupole deformation reducing the number of Nilsson orbitals close to the Fermi surface available to form octupole collectivity.

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Beta Decay of¹⁵¹Pr into Levels in¹⁵¹Nd

Cited by 9 publications

References 14 publications

Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Search for isomeric transitions in fission products around mass number 150

Near-yrast structure of odd-A, neutron-rich Pr isotopes

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