2019 Impact factor 2.176
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

muehelga@uni-freiburg.de

(Received 21 December 2001 Communicated by D. Schwalm)

Abstract
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.

PACS
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