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Title: Shell model level structure of {sup 216}Fr

Abstract

Sources of {sup 220}Ac in secular equilibrium with {sup 221}Pa were produced using the reaction {sup 209}Bi({sup 18}O,3n){sup 224}Pa. The alpha decay of {sup 220}Ac and coincident gamma and electron spectra were used to study the level structure of {sup 216}Fr. The levels in {sup 216}Fr can be interpreted in terms of the {pi}(h{sub 9/2}){sub 9/2}{sup 5}{nu}(g{sub 9/2}){sub 9/2}{sup 3}, {pi}(h{sub 9/2}){sub 0}{sup 4}(f{sub 7/2}){sub 7/2}{nu}(g{sub 9/2}){sub 9/2}{sup 3}, and {pi}(h{sub 9/2}){sub 9/2}{sup 5}{nu}(g{sub 9/2}){sub 0}{sup 2}(i{sub 11/2}){sub 11/2} shell model configurations. The alpha decay hindrance factors of the ground state to ground state transitions in the sequence {sup 224}Pa{r_arrow}{sup 220}Ac{r_arrow}{sup 216}Fr{r_arrow}{sup 212}At suggest the collapse of quadrupole-octupole Nilsson orbitals into the more degenerate shell model orbitals. The sequence of hindrance factors in this odd chain are mirrored in the corresponding odd proton and odd neutron sequences beginning with {sup 223}Pa and {sup 223}Th, respectively. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
 [1]; ;  [2];  [3]
  1. Departments of Chemistry and Physics, Florida State University, Tallahassee, Florida 32306 (United States)
  2. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Batiment 104, 91405 Campus Orsay (France)
  3. Institut des Sciences Nucleaire, IN2P3, Universite Joseph Fourier, F-38026 Grenoble (France)
Publication Date:
OSTI Identifier:
512766
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, C; Journal Volume: 55; Journal Issue: 3; Other Information: PBD: Mar 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; FRANCIUM 216; ENERGY LEVELS; ACTINIUM 220; ALPHA DECAY; SHELL MODELS; BISMUTH 209 TARGET; OXYGEN 18 REACTIONS; PROTACTINIUM 224; ELECTRON SPECTRA; GROUND STATES; ASTATINE 212; QUADRUPOLES; OCTUPOLES; NILSSON-MOTTELSON MODEL; GAMMA SPECTRA; ENERGY-LEVEL TRANSITIONS

Citation Formats

Sheline, R.K., Liang, C.F., Paris, P., and Gizon, A.. Shell model level structure of {sup 216}Fr. United States: N. p., 1997. Web. doi:10.1103/PhysRevC.55.1162.
Sheline, R.K., Liang, C.F., Paris, P., & Gizon, A.. Shell model level structure of {sup 216}Fr. United States. doi:10.1103/PhysRevC.55.1162.
Sheline, R.K., Liang, C.F., Paris, P., and Gizon, A.. Sat . "Shell model level structure of {sup 216}Fr". United States. doi:10.1103/PhysRevC.55.1162.
@article{osti_512766,
title = {Shell model level structure of {sup 216}Fr},
author = {Sheline, R.K. and Liang, C.F. and Paris, P. and Gizon, A.},
abstractNote = {Sources of {sup 220}Ac in secular equilibrium with {sup 221}Pa were produced using the reaction {sup 209}Bi({sup 18}O,3n){sup 224}Pa. The alpha decay of {sup 220}Ac and coincident gamma and electron spectra were used to study the level structure of {sup 216}Fr. The levels in {sup 216}Fr can be interpreted in terms of the {pi}(h{sub 9/2}){sub 9/2}{sup 5}{nu}(g{sub 9/2}){sub 9/2}{sup 3}, {pi}(h{sub 9/2}){sub 0}{sup 4}(f{sub 7/2}){sub 7/2}{nu}(g{sub 9/2}){sub 9/2}{sup 3}, and {pi}(h{sub 9/2}){sub 9/2}{sup 5}{nu}(g{sub 9/2}){sub 0}{sup 2}(i{sub 11/2}){sub 11/2} shell model configurations. The alpha decay hindrance factors of the ground state to ground state transitions in the sequence {sup 224}Pa{r_arrow}{sup 220}Ac{r_arrow}{sup 216}Fr{r_arrow}{sup 212}At suggest the collapse of quadrupole-octupole Nilsson orbitals into the more degenerate shell model orbitals. The sequence of hindrance factors in this odd chain are mirrored in the corresponding odd proton and odd neutron sequences beginning with {sup 223}Pa and {sup 223}Th, respectively. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevC.55.1162},
journal = {Physical Review, C},
number = 3,
volume = 55,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 1997},
month = {Sat Mar 01 00:00:00 EST 1997}
}