THE DISINTEGRATION OF NITROGEN BY FAST NEUTRONS

Journal Article · Tue Dec 01 04:00:00 EST 1959 · Nuclear Phys.

DOI:https://doi.org/10.1016/0029-5582(59)90013-6· OSTI ID:4171840

Gabbard, F; Bichsel, H; Bonner, T W

The disintegration of nitrogen by fast neutrons was studied using a grid- type ionization chamber filled with nitrogen or a nitrogen-argon mixture. Monoenergetic neutrons for studying the reactions from a neutron energy of 1.3 to 8.2 Mev were produced by the T/sup 3/(p,n)He/sup 3/ and D(d.n)He/sup 3/ reactions. One group of protons. three alpha particle groups, and a group of tritons were observed as disintegration products of the neutron reactions in nitrogen. The N/ sup 14/(n,p)C/sup 14/ reaction leaving C/sup 14/ in its ground state was studied from 1.3 to 4.3 Mev and the maximum cross section observed was 230 mb. Four groups of alpha -particles leading to the ground, 2.14, 4.46, and 5.03 Mev levels in B/sup 11/ were observed in the experiment. The cross section for the 4aa-particle group leading to the ground state of B/sup 11/ varied from 5 mb at a neutron energy of 1.3 Mev to 390 mb at 4.2 Mev and decreased for higher neutron energies. Triton emission leading to the ground state of C/sup 12/ was observed above a neutron energy of 5.6 Mev. Above 7 Mev, the cross sections for distntegration by emission of each of the alpha groups and by triton emission were about equal and were approximately 40 mb. The cross sections show many narrow resonances in the neutron energy range studied. The data show that alpha emission relative to proton and neutron emission from these highly excited states of N/sup 15/ is much more probable than expected on shell model considerations. (auth)

• Research Organization: Rice Inst., Houston, Tex.
• NSA Number: NSA-14-008102
• OSTI ID: 4171840
• Journal Information: Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 14
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
BORON 11
CARBON 12
CARBON 14
CROSS SECTIONS
DEUTERIUM
DEUTERON BEAMS
EMISSION
ENERGY
ENERGY LEVELS
ENERGY RANGE
FAST NEUTRONS
GASES
HELIUM 3
IONIZATION CHAMBERS
MEASURED VALUES
MIXING
NEUTRON SOURCES
NEUTRONS
NITROGEN
NITROGEN 14
NITROGEN 15
NUCLEAR MODELS
NUCLEAR REACTIONS
PHYSICS
PROTON BEAMS
PROTONS
RESONANCE
SHELL MODELS
TRITIUM
TRITONS