Analysis of experimental data on doublet neutron-deuteron scattering at energies below the deuteron-breakup threshold on the basis of the pole approximation of the effective-range function

Journal Article · Tue Jan 15 00:00:00 EST 2008 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1007/S11450-008-1005-Z· OSTI ID:21077572

Babenko, V A

On the basis of the Bargmann representation of the S matrix, the pole approximation is obtained for the effective-range function k cot {delta}. This approximation is optimal for describing the neutron-deuteron system in the doublet spin state. The values of r{sub 0} = 412.469 fm and v{sub 2} = -35 495.62 fm{sup 3} for the doublet low-energy parameters of neutron-deuteron scattering and the value of D = 172.678 fm{sup 2} for the respective pole parameter are deduced by using experimental results for the triton binding energy E{sub T}, the doublet neutron-deuteron scattering length a{sub 2}, and van Oers-Seagrave phase shifts at energies below the deuteron-breakup threshold. With these parameters, the pole approximation of the effective-range function provides a highly precise description (the relative error does not exceed 1%) of the doublet phase shift for neutron-deuteron scattering at energies below the deuteron-breakup threshold. Physical properties of the triton in the ground (T) and virtual (v) states are calculated. The results are B{sub v} = 0.608 MeV for the virtuallevel position and C{sub T}{sup 2} = 2.866 and C{sub v}{sup 2} = 0.0586 for the dimensionless asymptotic normalization constants. It is shown that, in the Whiting-Fuda approximation, the values of physical quantities characterizing the triton virtual state are determined to a high precision by one parameter, the doublet neutron-deuteron scattering length a{sub 2}. The effective triton radii in the ground ({rho}{sub T} = 1.711 fm) and virtual ({rho}{sub v} = 74.184 fm) states are calculated for the first time.

• OSTI ID: 21077572
• Journal Information: Physics of Atomic Nuclei, Vol. 71, Issue 1; Other Information: DOI: 10.1007/s11450-008-1005-z; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7788
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
ASYMPTOTIC SOLUTIONS
BINDING ENERGY
DEUTERONS
FUNCTIONS
MEV RANGE
NEUTRONS
OXYGEN ENHANCEMENT RATIO
PHASE SHIFT
PHYSICAL PROPERTIES
PROTON-NEUTRON INTERACTIONS
S MATRIX
SCATTERING
SCATTERING LENGTHS
SPIN
THRESHOLD ENERGY
UNITARY POLE APPROXIMATION
VIRTUAL STATES