skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Low-energy transfer cross section for Borromean halo nuclei

Abstract

We describe a schematic coupled-channels transfer calculation for the reaction {sup 6}He+{sup 238}U at near-barrier energies. We also present a simple semiclassical DWBA calculation of the two-neutron transfer. Both calculations are meant to supply the conditions under which the transfer cross section becomes much larger than the complete fusion one at subbarrier energies. It seems that a feasible mechanism is the incoherent contributions of two or more processes with quite different Q values.

Authors:
;  [1];  [2]
  1. Universidade de Sao Paulo, C.P. 66318, 05389-970 Sao Paulo (Brazil)
  2. Instituto de Fisica, Universidade Federal do Rio de Janeiro, C.P. 68528, 21945-970 Rio de Janeiro (Brazil)
Publication Date:
OSTI Identifier:
20771506
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.047603; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COUPLED CHANNEL THEORY; CROSS SECTIONS; DWBA; ENERGY TRANSFER; HELIUM 6; HELIUM 6 REACTIONS; NEUTRON TRANSFER; NUCLEAR HALOS; SEMICLASSICAL APPROXIMATION; URANIUM 238; URANIUM 238 TARGET

Citation Formats

Cardenas, W.H.Z., Hussein, M.S., and Canto, L.F.. Low-energy transfer cross section for Borromean halo nuclei. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.047603.
Cardenas, W.H.Z., Hussein, M.S., & Canto, L.F.. Low-energy transfer cross section for Borromean halo nuclei. United States. doi:10.1103/PhysRevC.73.047603.
Cardenas, W.H.Z., Hussein, M.S., and Canto, L.F.. Sat . "Low-energy transfer cross section for Borromean halo nuclei". United States. doi:10.1103/PhysRevC.73.047603.
@article{osti_20771506,
title = {Low-energy transfer cross section for Borromean halo nuclei},
author = {Cardenas, W.H.Z. and Hussein, M.S. and Canto, L.F.},
abstractNote = {We describe a schematic coupled-channels transfer calculation for the reaction {sup 6}He+{sup 238}U at near-barrier energies. We also present a simple semiclassical DWBA calculation of the two-neutron transfer. Both calculations are meant to supply the conditions under which the transfer cross section becomes much larger than the complete fusion one at subbarrier energies. It seems that a feasible mechanism is the incoherent contributions of two or more processes with quite different Q values.},
doi = {10.1103/PhysRevC.73.047603},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
  • We describe a schematic coupled channels transfer calculation for the reaction 6He + 238U at near-barrier energies. We also present a simple semiclassical DWBA calculation of the 2n-transfer. Both calculations are meant to supply the conditions under which the transfer cross section becomes much larger than the complete fusion one at sub-barrier energies. It seems that a feasible mechanism is the incoherent contribution of two or more processes with quite different Q-values. We also discuss the operation of the dispersion relation in low-energy collisions of loosely bound nuclei.
  • Energy correlations in transitions from the bound state to the three-body continuum of Borromean halo nuclei are considered. A core+n+n three-body cluster model which reproduces experimentally known properties of {sup 6}He and {sup 11}Li has been used to study low-lying resonances and soft modes. The analysis of the correlated responses in {sup 6}He shows that in the case of the narrow three-body 2{sub 1}{sup +} resonance the transition energy correlations are the same as in the intrinsic correlated structure in 3 {yields} 3 scattering. They differ significantly for wide 2{sub 2}{sup +}, 1{sub 1}{sup +} resonances, and also for themore » soft dipole and monopole modes, where, due to the transition operators, the intertwining of the ground state and the three-body continuum plays a significant role.« less
  • The general properties of intrinsic energy correlations in the three-body continuum of Borromean halo nuclei are considered. A model that describes the system as a three-body {alpha}+n+n cluster structure and reproduces the experimentally known properties of {sup 6}He and {sup 6}Li is used to study low-lying resonances and soft modes. The intrinsic correlated structure of the {sup 6}He continuum reveals a unique structure for three-body 2{sub 1}{sup +},2{sub 2}{sup +}, and 1{sub 1}{sup +} resonances and a lack of resonant structure in soft dipole and monopole modes.
  • Energy correlations in transitions from the bound state to the three-body continuum of Borromean halo nuclei are considered. A core+n+n three-body cluster model which reproduces the experimentally known properties of {sup 6}He and {sup 11}Li has been used to study the low-lying resonances and soft modes. An analysis of the correlated responses in {sup 6}He shows that in the case of the narrow three-body 2{sub 1}{sup +} resonance the transition energy correlations are the same as in the intrinsic correlated structure in 3{yields}3 scattering. They differ significantly for wide 2{sub 2}{sup +},1{sub 1}{sup +} resonances, and also for the softmore » dipole and monopole modes, where, due to the transition operators, the intertwining of the ground state and the three-body continuum plays a significant role.« less
  • A semianalytic connection between matter and charge radii for Borromean halo nuclei is derived. It is based on the three-body core +N+N cluster structure of those halo nuclei and knowledge of corresponding radii for the constituents. The charge form factor of {sup 6}He is predicted.