Dependence of x-ray emission following Pb(. cap alpha. ,xn)Po reactions on the neutron number of the residual nucleus

Journal Article · Tue Feb 01 04:00:00 EST 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.27.833· OSTI ID:6050428

Terwagne, G; Deconninck, G

In order to enable the measurement of nuclear structure effects on the emission of x rays following (..cap alpha..,xn) reactions, thin samples of Pb isotopes have been irradiated with ..cap alpha.. particles in 2-MeV steps between 30 and 110 MeV. X-ray excitation-yield curves have been measured on /sup 206/Pb, /sup 207/Pb, /sup 208/Pb, and /sup nat/Pb and show large variations with energy and the presence of maxima and minima. For each separated target isotope it is observed that the cross-section maxima and minima are correlated with the formation of a residual nucleus with odd and even neutron numbers, respectively. This effect is attributed to the level density in the residual nucleus which affects the transition energies and the conversion coefficients. In the case of /sup 206/Pb and /sup 208/Pb the nuclear cross sections are available and it is then possible to calculate the average number n-bar/sub K/ of K ionizations per nuclear reaction; this parameter is found to increase with bombarding energy as it is also correlated with the neutron number. These results clearly show that the x-ray emission yield is strongly dependent on the neutron number of the residual nucleus.

• Research Organization: Facultes Universitaires de Namur 5000, Belgium
• OSTI ID: 6050428
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 27:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

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Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
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A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALPHA REACTIONS
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
CORRELATIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
HADRONS
IONIZATION
IRRADIATION
ISOTOPES
LEAD ISOTOPES
METALS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NEUTRONS
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEONS
POLONIUM
SPECTRA
X-RAY EMISSION ANALYSIS
X-RAY SPECTRA