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• W1987612614 endingPage "832" @default.
• W1987612614 startingPage "669" @default.
• W1987612614 abstract "Abstract The evaluator presents in this publication spectroscopic data and level schemes from radioactive decay and nuclear reaction studies for all nuclei with mass numbers A=215, 219, 223, 227, and 231. Nuclei with mass number A=215 have spherical shape, and their nuclear structure have been interpreted in terms of the shell model. Nuclei with mass number A=219 belong to a transitional region with spherical, quadrupole, and possibly octupole deformations; those with mass numbers A=223 and 227 belong to a newly studied region of coexisting quadrupole with possible octupole deformations; and nuclei with mass number A=231 essentially have quadrupole deformation. Highlights of this publication are given below: A recent study of the 206 Pb( 13 C,4nγ) reaction (1998St24) has extended up to Jπ=61/2+ the previously known level scheme from 208 Pb( 13 C,6nγ) (1988Fu10,1983Lo16). This study has provided a new interpretation for all the spectroscopic data above the 2247--keV (Jπ=29/2--) level in 215 Ra. A new isotope, 219 U (42 μs), which was identified with the recoil separator VASSILISSA (1994Ye08,1994AnZY,1993An07), has been included in this evaluation. The first 223 Rn β-- decay scheme (1992Ku03) and a significantly improved measurement of 227 Ac α decay (1995Sh03) are presented here. A level scheme of 223 Fr has been constructed on the basis of these studies, where most of the levels below 600 keV have been assigned to parity doublet bands and interpreted in terms of the reflection--asymmetric rotor model. This evaluation includes the first level structures of 227 Fr and 227 Th. Levels in 227 Fr are from 227 Rn β-- decay (1997Ku20); those in 227 Th, are from 231 U α decay, from 227 Pa electron--capture decay, and from 226 Ra(α,3nγ) (1997Mu08,1995Li04,1998Ma83). A study of the β-- decay of a mass--separated source of 231 Fr has produced the first level scheme of 231 Ra (2001Fr05). The only published data (1994Br36,1996Le01) on the electron--capture decay of 231 U have provided much information on the level structure of 231 Pa. Studies on 232 Th(p,2nγ) and Coulomb Excitation of 231 Pa (1996Le01,1999Wu05), which have complemented the existing spectroscopic data from these reactions, have suggested the possibility of weak octupole correlations in 231 Pa. A new isotope of plutonium, 231 Pu (1999La14), has been included in this evaluation." @default.
• W1987612614 created "2016-06-24" @default.
• W1987612614 creator A5089571296 @default.
• W1987612614 date "1992-04-01" @default.
• W1987612614 modified "2023-10-16" @default.
• W1987612614 title "Nuclear data sheets for A = 215,219,223,227" @default.
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