Direct proof of the two-phonon character of the dipole excitations in {sup 142}Nd and {sup 144}Sm around 3.5 MeV

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.R449· OSTI ID:286839

Wilhelm, M; Radermacher, E; Zilges, A; von Brentano, P ^[1]

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1. Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strae 77, D-50937 Koeln, Germany Physics Department--WNSL, Yale University, New Haven, Connecticut 06520 (United States)

Resonant inelastic proton scattering experiments were carried out to investigate the {gamma} decay of the 1{sup {minus}} state at an excitation energy of around 3.5 MeV in the {ital N}=82 nuclei {sup 142}Nd and {sup 144}Sm. {gamma}-ray branching ratios were determined from {gamma}-proton coincidences in both nuclei. The newly observed {gamma} decay of the dipole excitation at 3225 keV in {sup 144}Sm to the one-phonon states, in particular the (1{sup {minus}}{r_arrow}3{sub 1}{sup {minus}}) {ital E}2 transition to the octupole phonon state, is the first direct proof of the two-phonon character of the 1{sup {minus}} state in any {ital N}=82 nucleus. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Yale University
• DOE Contract Number: FG02-91ER40609
• OSTI ID: 286839
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIPOLES
E2-TRANSITIONS
ENERGY
EXCITATION
GAMMA DECAY
INELASTIC SCATTERING
MEV RANGE 01-10
NEODYMIUM 142
OCTUPOLES
PROTON REACTIONS
SAMARIUM 144