Abstract
The38Ar levels at Ex=5350, 7289 and 9341 keV have been investigated using the35Cl(α,pγ) reaction at Eα=l4 and 14.5 MeV. From particle-γ-ray angular correlations the spin assignments J(5350)=4, J(7289)=6,4 and J(9341)=8,6,4 have been obtained. Life-time measurements using the Doppler-shift attenuation method yielded τ(9341)=106±25 fs and τ(7289)=77±30 fs, while the lifetime τ(5350)=200±50 fs was known previously. All levels have positive parity and decay by enhanced E2 transitions. Hence we propose that they are the Jπ=4+, 6+ and 8+ members, respectively, of a Kπ=0+ rotational band which has the Ex=3377keV, Jπ=0+ and the 3937 keV, Jπ=2+ levels as further members. The enhancement of inband E2 transitions is 30 +10−6 W.u. (4→2), 35 +30−14 W.u. (6→4) and 20–36 W.u. (8 → 6), respectively, yielding an average intrinsic quadrupole moment Q0=850 +200−125 mb. The moment of inertia is given by h22θ=92 keV. The present data are in good agreement with the predictions of a deformed state in38Ar that coexists with the spherical states.
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Gerace, W.J., Green, A.M.: Nucl. Phys. A113, 641 (1968)
Federman, P., Pittel, S.: Nucl. Phys. A155, 161 (1970)
Skouras, L.D.: Phys. Lett.31B, 439 (1970)
Dolan, K.W., McDaniels, D.K.: Phys. Rev.175, 1446 (1968)
Hartman, R., Grawe, H.: Nucl. Phys. A164, 209 (1971)
Alderliesten, C., Van Loon, C.A.L.: Nucl. Phys. A220, 317 (1974)
Röpke, H., Glattes, V., Brundiers, H.J., Hammel, G.: Z. Physik200, 67 (1973)
Litherland, A.E., Ferguson, J.A.: Can. J. Phys.39, 788 (1961)
Rose, H.J., Brink, D.M.: Rev. Mod. Phys.39, 306 (1967)
Röpke, H., Lieb, K.P., Brundiers, H.J.: Nucl. Phys. A104, 529 (1967)
Schmid, G.: Diplomarbeit Freiburg (1973) unpublished
Grawe, H., Lieb, K.P.: Nucl. Phys.A127, 13 (1969)
Metag, V., Repnow, R., Von Brentano, P., Dickmann, F., Dietrich, K.: Phys. Lett.34B, 257 (1971)
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Work supported by Deutsche Forschungsgemeinschaft.
The authors gratefully acknowledge the support of the technical staff of the accelerator.
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Betz, P., Röpke, H., Glatz, F. et al. Evidence for the coexistence of spherical and deformed states in38Ar. Z. Physik 271, 195–199 (1974). https://doi.org/10.1007/BF01676390
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DOI: https://doi.org/10.1007/BF01676390