Spectrographie α de 226Ra et niveaux des Rn de A pair

A thorough examination of the level structure of 223Ra provides evidence that leads to an extensive re-evaluation of spin assignments and hence band structure. Altogether six bands corresponding to three parity-coupled pairs are identified and the interpretation of the data suggests that this N = 135 nucleus may possess an octupole deformation.Results from a-y and y-y directional correlations and y-ray directional distribution measurements were combined and, together with internal conversion coefficient (ICC) data, give unique spin-parity assignments to most levels. A continuously purified source was used to make unambiguous y-ray assignments. Level half-lives were obtained from recoil distance and Doppler methods.The results show that the ground state is 3/2+. Parity doublets were identified as {3/2+(0 keV), 3/2-(50.1 keV)}, {1/2+(286.1 keV), 1/2-(350.5 keV)} and {5/2+(324.8 keV), 5/2-(369.3 keV)}. The multipole mixing ratios of many of the stronger y-ray transitions were determined and also the amplitudes and relative phases of the angular momentum components carried by the a decays.The band structure is interpreted within the framework of calculations using the Strutinski shell-correction method with a single-particle level scheme obtained with a Woods-Saxon mean field. The minimisation procedure for the total energy is achieved in a multideformation space including higher-order multipolarity deformations up to I. = 7. The importance of higher-order multipolarity deformation parameters is underlined.

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“…These wdecay energies are the BIPM standard values [19]; the other values are taken from reference [18], corrected following reference [ 191.…”

Section: Preparation Of Sourcesmentioning

confidence: 99%

A re-examination of the band structure of²²³Ra and reflection asymmetry in this nucleus

Briançon¹,

Ćwiok²,

Eid³

et al. 1990

J. Phys. G: Nucl. Part. Phys.

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“…(11) 41.09 (39) 672 (11) 46.52 (37) 185 (11) 2.762 (22) Bi-214, β t disintegration 3275 (11) 19.67 (20) 1894 (11) 7.45 (5) 1729 (1) 3.12 (4) 1542 (11) 17.494 (36) 1508 (11) 17.10 (8) 1425 (11) 8.147 (28) 1255 (11) 2.449 (10) 1153 (11) 4.339 (18) 1068 (11) 5.642 (43) 824 (11) 2.76 (6) Po-214, α disintegration 7833.24 (6) 99.9895 (7) 4 Alpha and beta emission probabilities A knowledge of alpha and beta direct emission probabilities is important, but, for this decay chain, recent direct emission probability measurements cannot be found in the literature. The unique measurements found were those given, for example, by Walen [23,24], Bastin-Scoffier (without uncertainties) [25] and LaMont [31] for alpha probabilities or by Hiessberger [26], Weinzierl [27] and Walen [23] (without uncertainties) for beta probabilities.…”

Section: Emission and Transition Probabilities Of The Major Gamma-raysmentioning

confidence: 99%

Evaluation of decay data of radium-226 and its daughters

Chisté

Bé

Dulieu

2007

Nd2007

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Recalibration of alpha particle energies

Wapstra¹

1964

Nuclear Physics

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Spectrographie α de 226Ra et niveaux des Rn de A pair

Abstract: La spectrographie des lignes faibles du radium montre que les schémas de niveaux des Rn 222, 220 et 218 sont très semblables. Mais numériquement, ces schémas ne s'expliquent pas par une des théories courantes

Cited by 16 publications

References 3 publications

A re-examination of the band structure of²²³Ra and reflection asymmetry in this nucleus

A re-examination of the band structure of²²³Ra and reflection asymmetry in this nucleus

Evaluation of decay data of radium-226 and its daughters

Recalibration of alpha particle energies

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Spectrographie α de 226Ra et niveaux des Rn de A pair

Abstract: La spectrographie des lignes faibles du radium montre que les schémas de niveaux des Rn 222, 220 et 218 sont très semblables. Mais numériquement, ces schémas ne s'expliquent pas par une des théories courantes

Cited by 16 publications

References 3 publications

A re-examination of the band structure of223Ra and reflection asymmetry in this nucleus

A re-examination of the band structure of223Ra and reflection asymmetry in this nucleus

Evaluation of decay data of radium-226 and its daughters

Recalibration of alpha particle energies

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Product

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A re-examination of the band structure of²²³Ra and reflection asymmetry in this nucleus

A re-examination of the band structure of²²³Ra and reflection asymmetry in this nucleus