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

Journal Article · Mon Feb 15 00:00:00 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, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevC.81.024313; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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