2022 Impact factor 2.7
Hadrons and Nuclei

Eur. Phys. J. A 14, 159-167 (2002)
DOI: 10.1140/epja/i2001-10201-5

High-spin states in $\chem{^{36}Ar}$ and their underlying shell model configurations

H. Röpke, J. Brenneisen and M. Lickert

Fakultät für Physik der Universität Freiburg, Freiburg i.Br., Germany


(Received 21 December 2001 Communicated by D. Schwalm)

Eight high-spin states in $\chem{^{36}Ar}$ below 10 MeV excitation energy, among them a prospective $J^{\pi} =
8^{-}$ state at 9408 keV and the $J \leq 8$ levels of the recently discovered superdeformed rotational band, have been observed by n- $\gamma$ coincidence measurements with the $\chem{{}^{33}S(\alpha,n\gamma)}$ reaction at $E_\alpha = 14.4$ and 13.4 MeV. High-spin assignments of, respectively, $J^{\pi}=6^+$ and 5- were obtained for the $E_\ab{p}= 1209$ and 1462 keV ( Ex=9682 and 9927 keV) resonances of the $\chem{{}^{35}Cl(p,\gamma)}$ reaction by a measurement of $\gamma$-ray angular distributions. The spectrum of the high-spin and of the $E_x\leq 7.4$ MeV levels is decomposed according to the underlying shell model configurations with n=0,1,2,4 particles excited from the N = 2 into the N = 3 major shell. The role of four-particle excitations, all connected with large prolate distortions, is elucidated for the entire A=36-40 mass region.

27.30.+t - $20 \leq A \leq 38$ .
21.60.Cs - Shell model.
21.10.Re - Collective levels.

© Società Italiana di Fisica, Springer-Verlag 2002