Experimental study of 1/2(+) isomers in At-199,At-201
Auranen, K., Uusitalo, J., Juutinen, S., Jakobsson, U., Grahn, T., Greenlees, P., Hauschild, K., Herzan, A., Julin, R., Konki, J., Leino, M., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., . . . Stolze, S. (2014). Experimental study of 1/2(+) isomers in At-199,At-201. Physical review c, 90(2), Article 024310. https://doi.org/10.1103/PhysRevC.90.024310
Published in
Physical review cDate
2014Copyright
© 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 SocietyISSN Search the Publication Forum
0556-2813Keywords
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