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Experimental study of 1/2(+) isomers in At-199,At-201

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Auranen, K., Uusitalo, J., Juutinen, S., Jakobsson, U., Grahn, T., Greenlees, P., . . . Stolze, S. (2014). Experimental study of 1/2(+) isomers in At-199,At-201. Physical review c, 90 (2), 024310. doi:10.1103/PhysRevC.90.024310
Published in
Physical review C
Authors
Auranen, Kalle |
Uusitalo, Juha |
Juutinen, Sakari |
Jakobsson, Ulrika |
Grahn, Tuomas |
Greenlees, Paul |
Hauschild, K. |
Herzan, Andrej |
Julin, Rauno |
Konki, Joonas |
Leino, Matti |
Pakarinen, Janne |
Partanen, Jari |
Peura, Pauli |
Rahkila, Panu |
Ruotsalainen, Panu |
Sandzelius, Mikael |
Sarén, Jan |
Scholey, Catherine |
Sorri, Juha |
Stolze, Sanna
Date
2014
Discipline
Fysiikka
Copyright
© 2014 American Physical Society. Published in this repository with the kind permission of the publisher.

 
Using fusion-evaporation reactions, a gas-filled recoil separator, and recoil-electron and recoil-electron-α tagging techniques, a new isomeric 1 2 + state [T1/2 = 45(3) ms] in 201At is identified, and an earlier reported corresponding state [T1/2 = 273(9) ms] in 199At is confirmed. The 1 2 + state is suggested to originate from an intruder π(s1/2) −1 configuration. In addition, nuclear structure of states below and above this 1 2 + state are studied in both nuclei. The isomer decays through a cascade of an E3 transition followed by a mixed M1/E2 transition to the 9 2 − ground state, and it is interpreted to be fed from nearly spherical 3 2 + and 5 2 + states originating from π(d3/2) −1 and π(d5/2) −1 configurations, respectively.
Publisher
American Physical Society
ISSN Search the Publication Forum
0556-2813
Keywords
nuclear-data sheets alpha-decay isotopes
DOI
10.1103/PhysRevC.90.024310
URI

http://urn.fi/URN:NBN:fi:jyu-201602021399

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