Nuclear resonance fluorescence in /sup 136/Ba

Journal Article · Wed Nov 01 04:00:00 EST 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.18.2138· OSTI ID:6876516

Metzger, F R

The resonant scattering of electron bremsstrahlung by an enriched sample of /sup 136/Ba has been studied for photon energies of up to 5 MeV. It provided estimates of the radiative widths for 10 levels. Based on the relative yields at scattering angles of 96/sup 0/ and 126/sup 0/, unambiguous spin assignments were made to 5 of these levels. Where feasible, the yield measurements were supplemented by self-absorption data and by linear polarization studies. For the strongest excitation in /sup 136/Ba, at 3.436 MeV, the resonance fluorescence experiments led to a 1/sup -/ assignment and a value GAMMA/sub 0/ = 88 +- 22 meV for the partial width of the ground state transition. The corresponding E1 strength is approximately 1/3 of the E1 strengths observed for the strongest low-lying E1 transitions in the even-even N = 82 nuclei. When combined with previous observations for N > 82, the result obtained for /sup 136/Ba (N = 80) indicates that the strengths of the ground state transitions from the lowest 1/sup -/ states peak at N = 82. Yield information on a few levels in /sup 137/Ba and /sup 138/Ba was also obtained.

• Research Organization: Bartol Research Foundation of The Franklin Institute, University of Delaware, Newark, Delaware 19711
• OSTI ID: 6876516
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 18:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARIUM 136
BARIUM 136 TARGET
BARIUM 137 TARGET
BARIUM 138 TARGET
BARIUM ISOTOPES
BREMSSTRAHLUNG
CROSS SECTIONS
DISTRIBUTION
E1-TRANSITIONS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FLUORESCENCE
GAMMA SPECTRA
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEVEL WIDTHS
LUMINESCENCE
MEV RANGE
MEV RANGE 01-10
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
PARITY
PARTICLE PROPERTIES
PHOTONUCLEAR REACTIONS
RADIATIONS
RESONANCE SCATTERING
SCATTERING
SPECTRA
SPIN
STABLE ISOTOPES
TARGETS