Experimental study of isomeric intruder 12+ states in At197,203

Auranen, K.; Uusitalo, J.; Juutinen, S.; Badran, H.; Bisso, F. Defranchi; Cox, D.; Grahn, T.; Greenlees, P. T.; Herzan, A.; Jakobsson, U.; Julin, R.; Konki, J.; Leino, M.; Lightfoot, A.; Mallaburn, M.; Neuvonen, O.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Rahkila, P.; Sandzelius, M.; Saren, J.; Scholey, C.; Sorri, J.; Stolze, S.

doi:10.1103/PhysRevC.95.044311

Experimental study of isomeric intruder ${\frac{1}{2}}^{+}$ states in ${}^{197, 203}{At}$

Journal Article · Mon Apr 10 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.044311· OSTI ID:1368565

Auranen, K. ^[1]; Uusitalo, J. ^[2]; Juutinen, S. ^[2]; Badran, H. ^[2]; Bisso, F. Defranchi ^[2]; Cox, D. ^[2]; Grahn, T. ^[2]; Greenlees, P. T. ^[2]; Herzan, A. ^[3]; Jakobsson, U. ^[4]; Julin, R. ^[2]; Konki, J. ^[2]; Leino, M. ^[2]; Lightfoot, A. ^[2]; Mallaburn, M. ^[5]; Neuvonen, O. ^[2]; Pakarinen, J. ^[2]; Papadakis, P. ^[2]; Partanen, J. ^[2]; Rahkila, P. ^[2] more »

Univ. of Jyvaskyla (Finland); Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Jyvaskyla (Finland)
Univ. of Jyvaskyla (Finland); Univ. of Liverpool, Liverpool (United Kingdom)
Royal Institute of Technology, Stockholm (Sweden); Univ. of Helsinki (Finland)
The Univ. of Manchester, Manchester (United Kingdom)

A newly observed isomeric intruder ½⁺ state [T_½=3.5(6)ms] is identified in ²⁰³At using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E3 and mixed M1/E2 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 ²⁰³At and ¹⁹⁷At are studied using in-beam γ-ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. As a result, the ½⁺ state is fed from 3/2⁺ and 5/2⁺ states, and the origin of these states are discussed.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Academy of Finland, Centre of Excellence; European Commission, Community Research and Development Information Service (CORDIS), Seventh Framework Programme (FP7); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1368565

Alternate ID(s):: OSTI ID: 1351042

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Prompt and delayed spectroscopy of At 203 : Observation of a shears band and a 29 / 2 + isomeric state Auranen, K.; Uusitalo, J.; Juutinen, S. Physical Review C, Vol. 97, Issue 2 https://doi.org/10.1103/physrevc.97.024301	journal	February 2018
Charge radii and electromagnetic moments of At 195 – 211 Cubiss, J. G.; Barzakh, A. E.; Seliverstov, M. D. Physical Review C, Vol. 97, Issue 5 https://doi.org/10.1103/physrevc.97.054327	journal	May 2018