Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 16: Spectroscopy: 17 ≤ A ≤ 70

HK 16.7: Talk

Monday, March 16, 1998, 18:30–18:45, D

Fast Gamow-Teller Decay of Neutron-Rich Mn Isotopes ^∗ — •M. Hannawald¹, T. Kautzsch¹, W. Böhmer¹, B. Pfeiffer¹, K.-L. Kratz¹, W.B. Walters², A. W"ohr³, V.N. Fedoseyev⁴, V.I. Mishin⁴, Y. Jading⁵, and and the ISOLDE Colaboration⁵ — ¹Kernchemie Mainz, Germany — ²University of Maryland, USA — ³KU Leuven, Belgium — ⁴Russian Acad. of Sciences, Troitzk, Russia — ⁵CERN, Switzerland

Neutron-rich Mn isotopes up to A=69 have been identified at CERN-ISOLDE using Z-selective laser ionization. Delayed-neutron and γ-ray spectra have been collected. The short half-lives reflect the strong νf_5/2 to πf_7/2 GT-transitions dominating their β-decay. The 2⁺-level systematics of the ee-Fe daughters indicates the onset of collectivity already near N=40. ^∗ work supported by BMBF (06MZ476) and DFG (436RUS/17/40/97)