Magnetic rotation in the A=80 region: M1 bands in heavy Rb isotopes

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Journal of Research of the National Institute of Standards and Technology

DOI:https://doi.org/10.6028/jres.105.017· OSTI ID:20085588

Schwengner, R; Schnare, H; Frauendorf, S ^[1]

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1. and others

The authors have studied the isotopes {sup 82}Rb{sub 45}, {sup 83}Rb{sub 46}, and {sup 84}Rb{sub 47} to search for magnetic rotation which is predicted in the tilted-axis cranking model for a certain mass region around A = 80. Excited states in these nuclei were populated via the reaction {sup 11}B + {sup 76}Ge with E = 50 MeV at the XTU tandem accelerator of the LNL Legnaro. Based on a {gamma}-coincidence experiment using the spectrometer GASP they have found magnetic dipole bands in each studied nuclide. The regular M1 bands observed in the odd-odd nuclei {sup 82}Rb and {sup 84}Rb include B(M1)/B(E2) ratios decreasing smoothly with increasing spin in a range of 13{sup {minus}} {le} J{sup {pi}} {le} 16{sup {minus}}. These bands are interpreted in the tilted-axis cranking model on the basis of four-quasiparticle configurations of the type {pi}(fp) {pi}g{sub 9/2}{sup 2} {nu}g{sub 9/2}. This is the first evidence of magnetic rotation in the A {approx} 80 region. In contrast, the M1 sequences in the odd-even nucleus {sup 83}Rb are not regular, and the B(M1)/B(E2) ratios show a pronounced staggering.

• Research Organization: Inst. fuer Kern- unde Hadronenphysik, Dresden (DE)
• OSTI ID: 20085588
• Journal Information: Journal of Research of the National Institute of Standards and Technology, Journal Name: Journal of Research of the National Institute of Standards and Technology Journal Issue: 1 Vol. 105; ISSN 1044-677X; ISSN JRITEF
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CRANKING MODEL
EXCITED STATES
GAMMA SPECTROSCOPY
M1-TRANSITIONS
NUCLEAR MAGNETIC MOMENTS
RUBIDIUM 82
RUBIDIUM 83
RUBIDIUM 84