Spectral structure of the pygmy dipole resonance

High-sensitivity studies of E1 and M1 transitions observed in the reaction 138Ba(gamma,gamma{'}) at energies below the one-neutron separation energy have been performed using the nearly monoenergetic and 100% linearly polarized photon beams of the HIgammaS facility. The electric dipole characte...

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Veröffentlicht in:	Physical review letters 2010-02, Vol.104 (7), p.072501-072501, Article 072501
Hauptverfasser:	Tonchev, A P, Hammond, S L, Kelley, J H, Kwan, E, Lenske, H, Rusev, G, Tornow, W, Tsoneva, N
Format:	Artikel
Sprache:	eng
Schlagworte:	ALKALINE EARTH ISOTOPES BARIUM 138 BARIUM ISOTOPES BEAMS BINDING ENERGY DIPOLES ELECTRIC DIPOLES ENERGY ENERGY RANGE ENERGY-LEVEL TRANSITIONS EVEN-EVEN NUCLEI EXCITATION FINE STRUCTURE INTERMEDIATE MASS NUCLEI ISOMERIC TRANSITION ISOTOPES ISOTOPES M1-TRANSITIONS MEV RANGE MULTIPOLE TRANSITIONS MULTIPOLES NANOSECONDS LIVING RADIOISOTOPES NEUTRON SEPARATION ENERGY NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEI PHOTON BEAMS RADIOISOTOPES RESONANCE SENSITIVITY ANALYSIS SPIN FLIP STABLE ISOTOPES
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Beschreibung
Zusammenfassung:	High-sensitivity studies of E1 and M1 transitions observed in the reaction 138Ba(gamma,gamma{'}) at energies below the one-neutron separation energy have been performed using the nearly monoenergetic and 100% linearly polarized photon beams of the HIgammaS facility. The electric dipole character of the so-called "pygmy" dipole resonance was experimentally verified for excitations from 4.0 to 8.6 MeV. The fine structure of the M1 "spin-flip" mode was observed for the first time in N=82 nuclei.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.104.072501