https://doi.org/10.1140/epja/s10050-024-01458-5
Regular Article - Experimental Physics
-Ray spectroscopy above the 9
isomeric state in the N = Z nucleus
As
1
Accelerator Laboratory, Department of Physics, University of Jyväskylä, 40014, Jyväskylä, Finland
2
Department of Physics, Indian Institute of Technology Roorkee, 247667, Roorkee, India
3
Grupo de Física Nuclear & CEI Moncloa, IPARCOS, Universidad Complutense de Madrid, 28040, Madrid, Spain
4
Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, 48824, East Lansing, MI, USA
Received:
12
June
2024
Accepted:
18
November
2024
Published online:
5
December
2024
Excited states above the isomer in the odd-odd N = Z nucleus
As were studied by employing the
Ca(
Si, pn) fusion-evaporation reaction at the Accelerator Laboratory of the University of Jyväskylä, Finland. A key method in this study was the use of conversion electrons emitted in the de-excitation of the isomeric state in
As as a tag for prompt
rays. Several new states have been added to the
As level scheme, which was extended up to a tentative spin of 23
. The previously reported even-spin yrast band has been reassigned to have odd spin values. The odd-spin states above the
isomer are compared with shell-model calculations using the jj44b and JUN45 interactions. Additionally, the recoil-
tagging efficiency of the recently developed scintillator detector named Tuike has been determined experimentally for the first time.
© The Author(s) 2024
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