New Levels in 162Gd DOLL Brayton M. (NBPHS, Vanderbilt University) BREWER, N.T. (Vanderbilt University) HAMILTON, J. H. (Vanderbilt University) RAMAYYA,

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Presentation transcript:

New Levels in 162Gd DOLL Brayton M. (NBPHS, Vanderbilt University) BREWER, N.T. (Vanderbilt University) HAMILTON, J. H. (Vanderbilt University) RAMAYYA, A. V. (Vanderbilt University) HWANG, J.K. (Vanderbilt University) LUO, Y. X. (Vanderbilt University, LBNL) RASMUSSEN, J. O. (LBNL) ZHU, S. J. (Vanderbilt University, Tsinghua University) TER-AKOPIAN, G. M. (JINR) Braytondoll@nbphs.net

Experimental Details Lawrence Berkeley National Laboratory Gammasphere Detector Array with 101 Compton-suppressed Ge Detectors 252Cf Source of 62 μCi Total of 5.7∗1011 triple and higher – fold γ-γ-γ coincidence events (in cube) Radware software package to analyze data

Results 162Gd 64 New levels in red Yrast states known from J. Phys. G: Nucl. Part. Phys. 30 (2004) 2+ state at 863.8 assigned in Physica Scripta. Vol. 34, 691-696, (1986) Other assignments based on systematics of other Gd nuclei.

704.5- partner transition from 86Se Proof of 753.8 Gate on 165 and 254 336.3, 411.9, 480.5 From yrast band 753.8- New transition 704.5- partner transition from 86Se

162Gd 64 New levels in red

Proof of 753.8 Gate on 253 and 753

162Gd 64 New levels in red

Physics of Deformed Nuclei Nuclei near midpoints between spherical shells are known to be well deformed Elevel = A∗I (I+1) Small First Exited State Presence of vibrational bands

Members of a gamma vibrational band Band Structure Rotational Band 162Gd 64 Members of a gamma vibrational band

Conclusion From our study of the spontaneous fission Californium-252 we found, for the first time: Six levels and nine gammas in 162Gd. We see nuclear structure consistent with that of a quadrupole deformed nucleus.

References and Acknowledgements J.H. Hamilton et.al., Prog. Part. Nucl. Phys., 35,635-704, (1995) D.C. Radford, Nucl. Instr. Meth. A, 361, 295-305, (1995) Wahl, A, At. Data Nucl. Data Tables 39, 1, (1988) E.F. Jones et.al., J. Phys. G: Nucl. Part. Phys. 30 (2004) G. Løvhøiden, T.F. Thorsteinsen, D.G. Burke, Physica Scripta. Vol. 34, 691-696, (1986)