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Title: Coulomb dissociation and momentum distributions for [sup 11]Li [yields] [sup 9]Li + n + n breakup reactions

Abstract

Momentum distributions for the [sup 11]Li [yields] [sup 9]Li+n+n breakup reaction, generated by Coulomb dipole excitations, axe calculated in a 3-body model for [sup 11]Li. The relative momentum distribution of the two neutrons is in good agreement with recent 3-body coincidence measurements but the momentum distribution for the [sup 9]Li recoil and the decay energy spectrum are much narrower than observed. These discrepancies may be due to higher order dynamical effects which have been ignored.

Authors:
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
DOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6643328
Report Number(s):
ANL/PHY/CP-78842; CONF-930275--1
ON: DE93008651
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: RIKEN international workshop on heavy-ion fusion reactors with neutron-rich beams, Saitama (Japan), 18-20 Feb 1993
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; LITHIUM 11 REACTIONS; BREAKUP REACTIONS; CROSS SECTIONS; DISSOCIATION; DISTRIBUTION; EXCITATION; GREEN FUNCTION; GROUND STATES; HAMILTONIANS; MATRIX ELEMENTS; NEUTRON EMISSION; CHARGED-PARTICLE REACTIONS; EMISSION; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; FUNCTIONS; HEAVY ION REACTIONS; MATHEMATICAL OPERATORS; NUCLEAR REACTIONS; QUANTUM OPERATORS 663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-); 663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)

Citation Formats

Esbensen, H. Coulomb dissociation and momentum distributions for [sup 11]Li [yields] [sup 9]Li + n + n breakup reactions. United States: N. p., 1993. Web.
Esbensen, H. Coulomb dissociation and momentum distributions for [sup 11]Li [yields] [sup 9]Li + n + n breakup reactions. United States.
Esbensen, H. 1993. "Coulomb dissociation and momentum distributions for [sup 11]Li [yields] [sup 9]Li + n + n breakup reactions". United States. doi:. https://www.osti.gov/servlets/purl/6643328.
@article{osti_6643328,
title = {Coulomb dissociation and momentum distributions for [sup 11]Li [yields] [sup 9]Li + n + n breakup reactions},
author = {Esbensen, H.},
abstractNote = {Momentum distributions for the [sup 11]Li [yields] [sup 9]Li+n+n breakup reaction, generated by Coulomb dipole excitations, axe calculated in a 3-body model for [sup 11]Li. The relative momentum distribution of the two neutrons is in good agreement with recent 3-body coincidence measurements but the momentum distribution for the [sup 9]Li recoil and the decay energy spectrum are much narrower than observed. These discrepancies may be due to higher order dynamical effects which have been ignored.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 1
}

Conference:
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  • Momentum distributions for the {sup 11}Li {yields} {sup 9}Li+n+n breakup reaction, generated by Coulomb dipole excitations, axe calculated in a 3-body model for {sup 11}Li. The relative momentum distribution of the two neutrons is in good agreement with recent 3-body coincidence measurements but the momentum distribution for the {sup 9}Li recoil and the decay energy spectrum are much narrower than observed. These discrepancies may be due to higher order dynamical effects which have been ignored.
  • Measurements of the breakup reactions: {sup 11}Be {yields} {sup 10}Be+n and{sup 8} {yields} {sup 7}Be+p are analyzed in a single-particle description. The signature of various structure properties associated with the valence nucleon axe discussed, as well as the significance of the different reaction mechanisms, namely Coulomb dissociation, stripping and nuclear induced diffraction.
  • The experiment was performed at GANIL and the secondary beams of the halo nuclei {sup 11}Be and {sup 11}Li impinged onto a Be target with energies of 38.5 MeV/u and 29.9 MeV/u, respectively. The distribution of neutrons in coincidence with fragments from the core-breakup reactions were studied. This reaction is interesting as the halo neutrons are expected to be released without any major distortion due to the reaction.
  • The Coulomb interaction between two protons is included in the calculation of proton-deuteron breakup and of three-body electromagnetic disintegration of {sup 3}He. The hadron dynamics is based on the purely nucleonic charge-dependent (CD) Bonn potential and its realistic extension, CD Bonn + {delta}, to a coupled-channel two-baryon potential, allowing for single virtual {delta}-isobar excitation. Calculations are done using integral equations in momentum space. The screening and renormalization approach is employed for including the Coulomb interaction. Convergence of the procedure is found at moderate screening radii. The reliability of the method is demonstrated. The Coulomb effect on breakup observables is seenmore » at all energies in particular kinematic regimes.« less
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