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

Kojima, Y.; Shibata, M.; Taniguchi, Atsuhiko; Kawase, Y.; Doi, Ryota; Nagao, A.; Shizuma, Kiyoshi

doi:10.1016/j.nima.2006.05.014

Cited by 8 publications

(14 citation statements)

References 12 publications

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“…1 at 35.1(2) keV, in agreement with the results reported i n [20]. This isomeric state was assigned to an excited state of 151 Pr in [20], based on the β-decay half life of its parent.…”

Section: A Lohengrin Measurementsupporting

confidence: 89%

“…Such bands would not agree with our conclusions about the level of octupole effects in odd-Z nuclei [6] and in nuclei with N > 92 [18,19]. A 35.1-keV isomeric state of 151 Pr has been reported [20] and so delayed γ-ray and conversion-electron spectroscopy of mass 151 nuclei has also been performed to give a more complete picture of the structure of this nucleus.…”

Section: Introductioncontrasting

confidence: 67%

“…The new experimental data on 151 Pr and the QPRM calculations of the present work also allow the β-decay data reported in Ref. [20] concerning 151 Pr to be reexamined. The 35.1-keV isomeric state was previously assigned a spin and parity of (7/2 + ) from lifetime arguments.…”

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

confidence: 55%

“…The 35.1-keV isomeric state was previously assigned a spin and parity of (7/2 + ) from lifetime arguments. However, this reasoning is weak as only a half-life limit of >10 µs could be assigned to this state in [20], leading to the assumption that the transition was M 2 in nature. The conversion-coefficient measurement of the 35.1-keV transition reported above excludes this and a spin of (1/2 + , 3/2 + ) was assigned with the aid of the QPRM predictions.…”

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

confidence: 99%

“…Without more experimental information it is difficult to give firm spin assignments to any of the other excited states of 151 Pr reported at 38.9, 362.0, 402.6, 467.7 and 636.8 keV in [20], even with the aid of the QPRM calculations. Some useful observations may however be made.…”

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

confidence: 99%

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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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“…1 at 35.1(2) keV, in agreement with the results reported i n [20]. This isomeric state was assigned to an excited state of 151 Pr in [20], based on the β-decay half life of its parent.…”

Section: A Lohengrin Measurementsupporting

confidence: 89%