Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 16: Spectroscopy: 17 ≤ A ≤ 70

HK 16.6: Talk

Monday, March 16, 1998, 18:15–18:30, D

Gamma-Spectroscopy of ⁶⁴Mn₃₉ and ⁶⁶Mn₄₁ Decays ^∗ — •A. Wöhr^1,2, W.B. Walters³, M. Hannawald¹, T. Kautzsch¹, W. Böhmer¹, K.-L. Kratz¹, B. Pfeiffer¹, V.N. Fedoseyev⁴, V.I. Mishin⁴, and and the ISOLDE Colaboration² — ¹Kernchemie Mainz, Germany — ²CERN, Switzerland — ³University of Maryland, USA — ⁴Russian Acad. of Sciences, Troitzk, Russia

Gamma-spectroscopic studies of laser-ionized Mn isotopes were performed at the CERN-ISOLDE facility. The new results on ⁶⁴Mn and ⁶⁶Mn decays extend the level-systematics of the even-even ₂₆Fe nuclides up to N=40. When compared to the 2⁺ and 4⁺ energies of the isotonic Ni and Zn nuclides sharp differences are revealed beyond N=36. The proton-magic ₂₈Ni isotopes, as expected, show the effect of the spherical N=40 subshell, whereas the ₃₀Zn level energies rise only through N=38 and than begin to show collectivity effects from occupancy of the ν-g_9/2 orbitals. The 2⁺ energies of the Fe isotones, however, start to drop already after N=36 indicating quenching of the N=40 subshell at Z=26. ^∗ work supported by BMBF (06MZ476) and DFG (436RUS/17/40/97)