Near-yrast structure of N=93 neutron-rich lanthanide nuclei

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.024313· OSTI ID:21388868

Simpson, G S; Pinston, J A; Angelique, J C; Genevey, J ^[1]; Urban, W ^[2]; Deloncle, I ^[3]; Faust, H R; Koester, U; Materna, T ^[4]; Orlandi, R ^[5]; Scherillo, A ^[6]; Smith, A G; Smith, J F ^[7]; RzaPca-Urban, T ^[2]; Ahmad, I; Greene, J P ^[8]

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1. LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex (France)
2. Faculty of Physics, University of Warsaw, ul.Hoza 69, PL-00-681 Warsaw (Poland)
3. CSNSM, Universite Paris-XI, CNRS/IN2P3, F-91405 Orsay Cedex (France)
4. Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9 (France)
5. INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Italy)
6. Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)
7. Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL (United Kingdom)
8. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Two neutron-rich N=93 isotones, {sup 155}Sm and {sup 153}Nd, have been studied by delayed gamma-ray and conversion-electron spectroscopy at the Lohengrin mass spectrometer. A half-life of 2.9(5) mus has been measured for the nu5/2{sup +}[642] state at 16.5 keV in {sup 155}Sm. The decay of a 1.17(7)-mus isomer in {sup 153}Nd, at 191.7 keV, has been remeasured and its spin has been reassigned as (5/2){sup +}. This state contains a strong component of the nu5/2{sup +}[642] Nilsson orbital. In addition, a new 1.00(8)-mus isomeric state at 538.6 keV, with a probable nu11/2{sup -}[505] Nilsson configuration, has been observed in {sup 155}Sm. Triple gamma-ray coincidence data from the spontaneous fission of a {sup 252}Cf source placed inside the Gammasphere array were used to extend the collective band on top of the (5/2{sup +}) isomeric state of {sup 153}Nd, and a new band with the same bandhead spin has been observed in {sup 151}Ce. The observation of this new band and an additional new transition in the ground-state band has led us to change the ground-state spin of {sup 151}Ce to (3/2{sup -}). Calculations using the quasiparticle-rotor model successfully reproduce the majority of the features of the gamma decays of these nuclei, including branching ratios and isomeric half-lives. Because this model uses a reflection-symmetric core, we conclude that the polarizing effect of the odd particle is responsible for the dipole moment present in the nu5/2{sup +}[642] states of the three nuclei studied and the nu11/2{sup -}[505] level of {sup 155}Sm.

• OSTI ID: 21388868
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BRANCHING RATIO
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CERIUM 151
CERIUM ISOTOPES
CONVERSION
DECAY
DIMENSIONLESS NUMBERS
DIPOLE MOMENTS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
FISSION
GAMMA DECAY
GAMMA RADIATION
GROUND STATES
HADRONS
HALF-LIFE
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERS
ISOTONIC NUCLEI
ISOTOPES
KEV RANGE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
METALS
MINUTES LIVING RADIOISOTOPES
NEODYMIUM 153
NEODYMIUM ISOTOPES
NEUTRONS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
RARE EARTH NUCLEI
RARE EARTHS
REFLECTION
SAMARIUM 155
SAMARIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTROMETERS
SPECTROSCOPY
SPIN
SPONTANEOUS FISSION
SPONTANEOUS FISSION RADIOISOTOPES
SYMMETRY
YEARS LIVING RADIOISOTOPES
YRAST STATES