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Experimental study of isomeric intruder ½+ states 197,203At

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Auranen, K., Uusitalo, J., Juutinen, S., Badran, H., Bisso, F. D., Cox, D., . . . Stolze, S. (2017). Experimental study of isomeric intruder ½+ states 197,203At. Physical Review C, 95 (4), 044311. doi:10.1103/PhysRevC.95.044311
Published in
Physical Review C
Authors
Auranen, Kalle |
Uusitalo, Juha |
Juutinen, Sakari |
Badran, Hussam |
Bisso, Federica Defranchi |
Cox, Daniel |
Grahn, Tuomas |
Greenlees, Paul |
Herzan, Andrej |
Jakobsson, U. |
Julin, Rauno |
Konki, Joonas |
Leino, Matti |
Lightfoot, Alexandra |
Mallaburn, M. |
Neuvonen, Olavi |
Pakarinen, Janne |
Papadakis, Philippos |
Partanen, Jari |
Rahkila, Panu |
Sandzelius, Mikael |
Sarén, Jan |
Scholey, Catherine |
Sorri, Juha |
Stolze, Sanna
Date
2017
Copyright
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.

 
A newly observed isomeric intruder ½ + state [ T ½ = 3.5 ( 6 ) ms ] is identified in 203 At using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E 3 and mixed M 1 / E 2 transitions to the 9 / 2 − ground state, and it is suggested to originate from the π ( s ½ ) − 1 configuration. In addition, the structures above the ½ + state in 203 At and 197 At are studied using in-beam γ -ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. The ½ + state is fed from 3 / 2 + and 5 / 2 + states, and the origin of these states are discussed.
Publisher
American Physical Society
ISSN Search the Publication Forum
2469-9985
Keywords
isomers intruder states astatine
DOI
10.1103/PhysRevC.95.044311
URI

http://urn.fi/URN:NBN:fi:jyu-201705022136

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