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Reorientation measurements on tungsten isotopes

Journal Article:

Abstract

In a particle-..gamma.. coincidence experiment, a thick tungsten target, of natural isotopic abundance, was bombarded with ..cap alpha.. and /sup 16/O beams. From analysis of the deexcitation ..gamma..-rays following Coulomb excitation, the spectroscopic quadrupole moment of the second 2/sup +/ state (the 2/sup +/' state) was determined for /sup 186/W and /sup 184/W. In a separate Coulomb excitation experiment a thin, isotopically enriched /sup 186/W target was bombarded with /sup 16/O ions. From analysis of projectiles scattered elastically and inelastically the quadrupole moment of the 2/sup +/' state of /sup 186/W was extracted. The results of the two experiments are in good agreement. The quadrupole moment of the 2/sup +/' state is found to be opposite in sign to that of the first 2/sup +/ state for both isotopes studied. However, its magnitude decreases rapidly in going from /sup 186/W to /sup 184/W, in contrast to the predictions of the rotation-vibration of asymmetric rotor models. The microscopic theory of Kumar and Baranger does predict the experimental trend, qualitatively. Thus the present results are interpreted as being evidence of strong coupling between ..beta.. and ..gamma.. degrees of freedom in the tungsten isotopes, which, according to the theory of Kumar and Baranger,  More>>
Authors:
O'Brien, J J; Saladin, J X; Baktash, C; Alessi, J G [1] 
  1. Pittsburgh Univ., Pa. (USA)
Publication Date:
Nov 14, 1977
Product Type:
Journal Article
Reference Number:
AIX-09-366999; EDB-78-076851
Resource Relation:
Journal Name: Nucl. Phys., A; (Netherlands); Journal Volume: 291:2
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHARGED PARTICLES; CHARGED-PARTICLE REACTIONS; COMPUTER CODES; COUNTING TECHNIQUES; CROSS SECTIONS; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ENERGY LEVELS; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EVEN-EVEN NUCLEI; EXCITATION; HEAVY ION REACTIONS; HEAVY NUCLEI; IONIZING RADIATIONS; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MEV RANGE; NUCLEAR REACTIONS; NUCLEI; OXYGEN ISOTOPES; RADIATIONS; SCATTERING; SPECTRA; STABLE ISOTOPES; TARGETS; TUNGSTEN ISOTOPES; 651824* - Nuclear Properties & Reactions, A=150-189, Experimental- Moments & Spin- (-1987); 651825 - Nuclear Properties & Reactions, A=150-189, Experimental- Nuclear Reactions & Scattering- (-1987)
OSTI ID:
5085953
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NUPAB
Submitting Site:
INIS
Size:
Pages: 510-526
Announcement Date:

Journal Article:

Citation Formats

O'Brien, J J, Saladin, J X, Baktash, C, and Alessi, J G. Reorientation measurements on tungsten isotopes. Netherlands: N. p., 1977. Web.
O'Brien, J J, Saladin, J X, Baktash, C, & Alessi, J G. Reorientation measurements on tungsten isotopes. Netherlands.
O'Brien, J J, Saladin, J X, Baktash, C, and Alessi, J G. 1977. "Reorientation measurements on tungsten isotopes." Netherlands.
@misc{etde_5085953,
title = {Reorientation measurements on tungsten isotopes}
author = {O'Brien, J J, Saladin, J X, Baktash, C, and Alessi, J G}
abstractNote = {In a particle-..gamma.. coincidence experiment, a thick tungsten target, of natural isotopic abundance, was bombarded with ..cap alpha.. and /sup 16/O beams. From analysis of the deexcitation ..gamma..-rays following Coulomb excitation, the spectroscopic quadrupole moment of the second 2/sup +/ state (the 2/sup +/' state) was determined for /sup 186/W and /sup 184/W. In a separate Coulomb excitation experiment a thin, isotopically enriched /sup 186/W target was bombarded with /sup 16/O ions. From analysis of projectiles scattered elastically and inelastically the quadrupole moment of the 2/sup +/' state of /sup 186/W was extracted. The results of the two experiments are in good agreement. The quadrupole moment of the 2/sup +/' state is found to be opposite in sign to that of the first 2/sup +/ state for both isotopes studied. However, its magnitude decreases rapidly in going from /sup 186/W to /sup 184/W, in contrast to the predictions of the rotation-vibration of asymmetric rotor models. The microscopic theory of Kumar and Baranger does predict the experimental trend, qualitatively. Thus the present results are interpreted as being evidence of strong coupling between ..beta.. and ..gamma.. degrees of freedom in the tungsten isotopes, which, according to the theory of Kumar and Baranger, is the source of the reduced value of the quadrupole moment.}
journal = {Nucl. Phys., A; (Netherlands)}
volume = {291:2}
journal type = {AC}
place = {Netherlands}
year = {1977}
month = {Nov}
}