Recent Results from the Excitation of Dipole States at the HI{gamma}S Facility

Journal Article · Wed Jan 28 00:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3087126· OSTI ID:21255520

Tonchev, A P; Hutcheson, A; Kwan, E; Rusev, G; Tornow, W ^[1]; Angell, C; Hammond, S; Karwowski, H J ^[2]; Kelley, J H; Tsoneva, N ^[3]

---

1. Duke University and TUNL, Department of Physics, Box 90308, Durham, NC 27708-0308 (United States)
2. University of North Carolina and TUNL, Department of Physics and Astronomy, Chapel Hill, NC 27599-3255 (United States)
3. North Carolina State University and TUNL, Department of Physics, Box 8202, Raleigh, NC 27695-8202 (United States)

High-sensitivity studies of E1 and M1 excitations observed in the {sup 138}Ba({gamma},{gamma}') reaction at energies below the neutron emission threshold have been performed. The electric dipole character of the so-called 'pygmy' mode was experimentally verified for excitations from 4.0-8.6 MeV. The fine structure of the M1 'spin-flip' mode was observed for the first time in N = 82 nuclei.

• OSTI ID: 21255520
• Journal Information: AIP Conference Proceedings, Vol. 1090, Issue 1; Conference: 13. international symposium on capture gamma-ray spectroscopy and related topics, Cologne (Germany), 25-29 Aug 2008; Other Information: DOI: 10.1063/1.3087126; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARIUM 138
E1-TRANSITIONS
ELECTRIC DIPOLES
EXCITATION
FINE STRUCTURE
M1-TRANSITIONS
MEV RANGE 01-10
NEUTRON EMISSION
PARITY
SENSITIVITY ANALYSIS
SPIN FLIP