Gamma-ray induced Doppler broadening and the determination of lifetimes of excited nuclear states

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6422071

Boerner, H G; Jolie, J; Robinson, S J ^[1]; Kessler, E G; Dewey, S M; Greene, G; Deslattes, R ^[2]; Ulbig, S; Lieb, K P ^[3]; Casten, R F ^[4]; Krusche, B ^[5]; Cizewski, J A ^[6]

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1. Institut Laue-Langevin, 38 - Grenoble (France)
2. National Inst. of Standards and Technology, Gaithersburg, MD (USA)
3. Goettingen Univ. (Germany, F.R.)
4. Brookhaven National Lab., Upton, NY (USA)
5. Giessen Univ. (Germany, F.R.)
6. Rutgers--the

Measurements of lifetimes of excited states in nuclei yield crucial information for sensitive tests of nuclear models. Here a novel method will be discussed which involves the GRID (Gamma Ray Induced Doppler broadening) technique, in which Doppler broadening is observed in a transition from a nucleus recoiling from the emission of a previous gamma ray. As the recoil energy is extremely small, ultra-high energy resolving power has to be used. To date all such experiments have been carried out at ILL using the GAMS4 double flat crystal spectrometer which is operated in a NIST-ILL collaboration. The method can be used for all lifetimes below a few picoseconds. The wide range of applicability, together with the very exhaustive set of data often obtained, is an advantage with respect to many other methods. The characteristic features of GRID will be discussed using some selected examples. 21 refs., 8 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6422071
• Report Number(s): BNL-45286; CONF-901057--16; ON: DE91004002
• Country of Publication: United States
• Language: English

Related Subjects

651100* -- Nuclear Physics-- Experimental Techniques-- (1980-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CAPTURE
DOPPLER BROADENING
ENERGY LEVELS
EXCITED STATES
GAMMA SPECTRA
GAMMA SPECTROSCOPY
HADRON REACTIONS
LIFETIME
LINE BROADENING
MATHEMATICAL MODELS
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
SPECTRA
SPECTROSCOPY