Detailed angular correlation analysis with 4{pi} spectrometers: Spin determinations and multipolarity mixing measurements in {sup 128}Ba

Journal Article · Sat Aug 01 00:00:00 EDT 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.58.721· OSTI ID:639183

Wiedenhoever, I; Vogel, O; Klein, H; Dewald, A; von Brentano, P; Gableske, J; Nicolay, N; Gelberg, A ^[1]; Wiedenhoever, I; Janssens, R V; Carpenter, M P ^[2]; Kruecken, R ^[3]; Petkov, P ^[4]; Gizon, A; Gizon, J ^[5]; Bazzacco, D; Rossi Alvarez, C; Pavan, P ^[6]; de Angelis, G; Lunardi, S ; Napoli, D R ^[7]; Frauendorf, S; Doenau, F ^[8]

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1. Institut fuer Kernphysik der Universitaet zu Koeln, 50937 Koeln (Germany)
2. Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
3. W. A. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
4. Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, 1784 Sofia (Bulgaria)
5. Institut des Sciences Nucleaires, Universite J. Fourier, F-38036 Grenoble Cedex (France)
6. Dipartimento di Fisica and INFN, Sezione di Padova, Padova (Italy)
7. INFN, Laboratori Nazionali di Legnaro, Legnaro (Italy)
8. Forschungszentrum Rossendorf, D-01219 Dresden (Germany)

We analyze for the first time the full {gamma}{gamma} directional correlations from oriented states (DCO) in an experiment performed with the GASP detector array. Our analysis is based on a transformation of the directional information into expansion coefficients of an orthogonal basis. With this method, which we call SpeeDCO (spectral expansion of DCO), the complete DCO information is concentrated in 12 {gamma}{gamma} coincidence spectra. The analysis is applicable to all detector arrays which uniformly cover the solid angle. We show that the complete DCO information can be used for a reliable and unique determination of spins and multipolarity mixing ratios in weakly populated bands. We were able to establish the spins and the positive parity of the {Delta}I=1 {open_quotes}M1 band{close_quotes} in {sup 128}Ba and multipolarity mixing ratios of nine M1/E2 in-band transitions were derived as well. The measured values are in good agreement with those expected for a high-K rotational band. thinsp thinsp thinsp {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 639183
• Journal Information: Physical Review, C, Vol. 58, Issue 2; Other Information: PBD: Aug 1998
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM 128
SPIN
MIXING RATIO
COINCIDENCE METHODS
GAMMA SPECTRA
MULTIPOLARITY
M1-TRANSITIONS
E2-TRANSITIONS
ROTATIONAL STATES
ANGULAR CORRELATION