Level structure of $^{69}\mathrm{Se}$

Level structure of ${}^{69}{Se}$

I. Stefanescu, J. Eberth, G. de Angelis, N. Warr, G. Gersch, T. Steinhardt, O. Thelen, D. Weisshaar, T. Martinez, A. Jungclaus, R. Schwengner, K. P. Lieb, E. A. Stefanova, D. Curien, and A. Gelberg

Phys. Rev. C 69, 034333 – Published 29 March 2004

Abstract

Excited levels in ${}^{69}{Se}$ have been studied using the ${}^{40}{Ca} ({}^{32}S, 2 p n) {}^{69}{Se}$ reaction at 95- and $105 − MeV$ beam energy. $γ$ rays have been detected with the EUROBALL spectrometer operated in conjunction with the neutron wall and the charged-particle detector array EUCLIDES. New level sequences with positive and negative parities have been identified from $n − γ γ$ and $n − γ γ γ$ coincidences. Spins have been assigned to many of the levels on the basis of angular distribution and directional correlation measurements. Excitation energies of the positive-parity yrast band and the branching ratios of its decay are compared with the predictions of the rigid triaxial rotor plus particle model.

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Received 11 September 2003

DOI:https://doi.org/10.1103/PhysRevC.69.034333

Authors & Affiliations

I. Stefanescu^1,2, J. Eberth¹, G. de Angelis³, N. Warr¹, G. Gersch¹, T. Steinhardt¹, O. Thelen¹, D. Weisshaar¹, T. Martinez³, A. Jungclaus⁴, R. Schwengner⁵, K. P. Lieb⁶, E. A. Stefanova⁶, D. Curien⁷, and A. Gelberg¹

¹Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
²Horia-Hulubei National Institute for Physics and Nuclear Engineering, P. O. Box MG-6, Bucharest, Romania
³Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali de Legnaro, via Romea 4, I-35020 Legnaro, Italy
⁴Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, E-28006 Madrid, Spain and Departamento de Fisica Teórica, Univ. Autonoma de Madrid, E-28049 Madrid, Spain
⁵Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
⁶II Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
⁷Institut de Recherches Subatomiques, CNRS-IN2P3, F-67037 Strasbourg, France

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Vol. 69, Iss. 3 — March 2004

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Physical Review C

covering nuclear physics

Level structure of ${}^{69}{Se}$

I. Stefanescu, J. Eberth, G. de Angelis, N. Warr, G. Gersch, T. Steinhardt, O. Thelen, D. Weisshaar, T. Martinez, A. Jungclaus, R. Schwengner, K. P. Lieb, E. A. Stefanova, D. Curien, and A. Gelberg

Phys. Rev. C 69, 034333 – Published 29 March 2004

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Level structure of Se69

I. Stefanescu, J. Eberth, G. de Angelis, N. Warr, G. Gersch, T. Steinhardt, O. Thelen, D. Weisshaar, T. Martinez, A. Jungclaus, R. Schwengner, K. P. Lieb, E. A. Stefanova, D. Curien, and A. Gelberg

Phys. Rev. C 69, 034333 – Published 29 March 2004

Abstract

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Level structure of ${}^{69}{Se}$