Nuclear Data Sheets for A = 229

Journal Article · Sat Nov 15 04:00:00 EST 2008 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/j.nds.2008.10.001· OSTI ID:21163758

Browne, E ^[1]; Tuli, J K ^[2]

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1. Lawrence Berkeley National Laboratory under subcontract with National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
2. National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

The evaluators present in this publication spectroscopic data and level schemes from radioactive decay and nuclear reaction studies for all nuclei with mass number A = 229. These nuclei belong to a region of coexisting quadrupole with possible octupole deformations. The latter have been observed in {sup 229}Ra, but in {sup 229}Pa the experimental evidence is inconclusive. The present evaluation of A = 229, which includes all data received by June 2008, supersedes the 1989 evaluation by Y.A. Akovali, published in Nuclear Data Sheets58, 555 (1989). Highlights of this publication are given below: A comprehensive spectroscopic study of {sup 229}Fr(50.2 s) {beta}- decay using mass-separated sources have provided the first evidence of parity doublets in {sup 229}Ra due to nuclear octupole deformation (1999Fr33). In {sup 229}Th a level at 7.6 5 eV - the closest level to the ground state ever known - has been confirmed through extremely precise measurements of {gamma}-ray energies from {sup 233}U {alpha} decay (1994He08, 2007Be16). A nuclear level at such low energy may be used for studying a large variety of atomic properties associated to nuclear decay. The level structure in {sup 229}Pa has been interpreted in terms of the rotational model (1994Le22). Some authors, however, have proposed the existence of parity doublets as evidence of octupole nuclear deformation (1982Ah08). This interpretation has not been confirmed.

• OSTI ID: 21163758
• Journal Information: Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Journal Issue: 11 Vol. 109; ISSN NDTSBA; ISSN 0090-3752
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIUM 229
ALPHA DECAY
BETA DECAY
EVALUATED DATA
FRANCIUM 229
GAMMA RADIATION
GROUND STATES
NEPTUNIUM 229
NUCLEAR DATA COLLECTIONS
NUCLEAR DEFORMATION
NUCLEAR REACTIONS
OCTUPOLES
PARITY
PLUTONIUM 229
PROTACTINIUM 229
QUADRUPOLES
RADIUM 229
THORIUM 229
URANIUM 229
URANIUM 233