Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Kernphysik / Spektroskopie III

HK 22.5: Talk

Thursday, March 23, 2000, 15:15–15:30, B 68

Signature inversion in the odd-odd ⁷²Br nucleus ^* — •C. Borcan¹, H. Schnare¹, R. Schwengner¹, L. Käubler¹, F. Dönau¹, I. Ragnarsson², A.V. Afanasjev², J. Eberth³, T. Steinhardt³, O. Thelen³, M. Hausmann⁴, A. Jungclaus⁴, K.P. Lieb⁴, A. Algora⁵, G. deAngelis⁵, A. Gadea⁵, D.R. Napoli⁵, D. Jenkins⁶, R. Wadsworth⁶, and A. Wilson⁶ — ¹Inst. f. Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — ²Lund Institute of Technology, S-221 00 Lund, Sweden — ³IKP, Inst. f. Kernphysik, Uni zu Köln, 50937 Köln — ⁴II. Physikalisches Institut, Uni Göttingen, 37073 Göttingen — ⁵INFN, I-35020 Legnaro, Italy — ⁶York University, Y01 5DD York, United Kingdom

The phenomenon of signature inversion was found within the π g_9/2 ν g_9/2 bands in ^74,76,78Br below spin I ≈ 10ℏ. We have studied the next lighter odd-odd isotope ⁷²Br nucleus. Excited states in ⁷²Br were populated using the reaction ⁴⁰Ca(⁴⁰Ca,1α3p1n) at a beam energy of 185 MeV. Coincidences of γ rays, charged particles and neutrons have been measured using the EUROBALL III array.
The level scheme has been substantially expanded up to spin 26⁻ and 13 MeV excitation energy. The negative-parity signature partners display a very clear effect of signature inversion around spin I ≈ 15 ℏ. This phenomenon is discussed in terms of the configuration-dependent shell-correction cranking model.
^*Supported by the BMBF under the contract 06 DR 827.