Electroexcitation of levels in /sup 14/N between 12 and 21 MeV

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.29.1168· OSTI ID:6874734

Bergstrom, J C; Neuhausen, R; Lahm, G

Four M4 transitions based on the stretched particle-hole excitation (1d/sub 5/2/1p/sup -1//sub 3/2/)/sub 4/- have been observed in /sup 14/N by inelastic electron scattering, and their form factors have been measured over the range q = 0.8--2.8 fm/sup -1/. The states are at 15.01 (3/sup -/,4/sup -/), 16.91 (5/sup -/), 18.48 (5/sup -/), and 20.11 MeV (3/sup -/,4/sup -/) and all have Troughly-equal1. The 16.91 and 18.48 MeV states together exhaust 61--84 % of the possible M4 strength for J/sup ..pi../ = 5/sup -/, the higher percentage obtaining for a phenomenological ground-state wave function which fits the static electromagnetic moments. The 15.01 and 20.11 MeV transitions exhaust over 60% of the M4 strength allowed for J/sup ..pi../ = 3/sup -/, but the spins are still uncertain. Combined with recent /sup 14/N(..pi..,..pi..') results, a triplet of 5/sup -/ states with T = 0,1,0 is apparent at 14.66, 16.91, and 17.46 MeV and a three-state isospin-mixing scheme is invoked to describe the ..pi../sup +//..pi../sup -/ asymmetries. Using the (e,e') data as a calibration, and assuming a simplified ground-state wave function, the joint analysis indicates the 5/sup -/ triplet exhausts roughly 60% of the isovector 5/sup -/ strength but only about 35% of the isoscalar strength. Significant C3 strength is found in a triplet of levels at 12.82 (4/sup -/), 11.24 (3/sup -/), and 13.17 MeV (2/sup -/.). The form factors are interpreted in terms of a weak coupling of the valence nucleons to a K = 3 rotational excitation of a deformed core. Finally, an isovector M2 transition is found at 14.72 MeV (2/sup -/.) and is analyzed in terms of a phenomenological shell-model configuration.

• Research Organization: Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N0W0
• OSTI ID: 6874734
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 29:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEFORMED NUCLEI
ELECTRON REACTIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FORM FACTORS
FUNCTIONS
HADRON REACTIONS
INELASTIC SCATTERING
ISOTOPES
LEPTON REACTIONS
LIGHT NUCLEI
M2-TRANSITIONS
M4-TRANSITIONS
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
MULTIPOLE TRANSITIONS
NITROGEN 14
NITROGEN 14 TARGET
NITROGEN ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
PARTICLE-HOLE MODEL
PION REACTIONS
ROTATIONAL STATES
SCATTERING
SHELL MODELS
SPIN
STABLE ISOTOPES
TARGETS
WAVE FUNCTIONS