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Title: Resonance extractions in the {alpha}+{sup 8}He slow scattering

Abstract

The {alpha}+{sup 8}He low-energy reactions and the exotic structures of {sup 12}Be={alpha}+{alpha}+4N are studied by the application of the generalized two-center cluster model. In the two-neutron transfer reactions, {alpha}+{sup 8}He{sub g.s.}{yields}{sup 6}He{sub g.s.}+{sup 6}He{sub g.s.}, resonant structures with a sharp width of {Gamma}<1 MeV appear in the central collision (J{sup {pi}=}0{sup +}). The reaction mechanism is analyzed, and we confirmed that the transfer coupling plays essential roles in the resonance formation with sharp width. Angular distributions for the scattered {sup 6}He are analyzed to extract resonant structures for individual partial waves. We found that, for the low-spin resonances, the angular selection around 90 deg. in the center-of-mass system, which is usually employed in the high-spin resonances of light-ion systems, is not necessarily appropriate to separate the resonance contribution with a definite spin. The validity of the selection angle around 90 deg. is discussed in the higher partial waves.

Authors:
 [1];  [2];  [3];  [4]
  1. Pure and Applied Physics, Kansai University, Yamate-cho 3-3-35, Suita 564-8680 (Japan)
  2. (RCNP), Osaka University, Mihogaoka 10-1, Suita 567-0047 (Japan)
  3. (Japan)
  4. National Superconducting Cyclotron Laboratory, Michigan State University, 1 Cyclotron, East Lansing, Michigan 48824-1321 (United States)
Publication Date:
OSTI Identifier:
21596588
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.84.014608; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA REACTIONS; ANGULAR DISTRIBUTION; BERYLLIUM 12; CENTER-OF-MASS SYSTEM; CLUSTER MODEL; COLLISIONS; COUPLING; EXTRACTION; HELIUM 6; HELIUM 8; LIGHT IONS; NEUTRON TRANSFER; PARTIAL WAVES; REACTION KINETICS; RESONANCE; SCATTERING; SPIN; TRANSFER REACTIONS; ALKALINE EARTH ISOTOPES; ANGULAR MOMENTUM; BERYLLIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHARGED PARTICLES; CHARGED-PARTICLE REACTIONS; DIRECT REACTIONS; DISTRIBUTION; EVEN-EVEN NUCLEI; HELIUM ISOTOPES; IONS; ISOTOPES; KINETICS; LIGHT NUCLEI; MATHEMATICAL MODELS; MILLISECONDS LIVING RADIOISOTOPES; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; PARTICLE PROPERTIES; RADIOISOTOPES; SEPARATION PROCESSES

Citation Formats

Ito, Makoto, Research Center for Nuclear Physics, RIKEN Nishina Center for Accelerator-based Science, RIKEN, Wako, 351-0198, Saitama, and Suzuki, Daisuke. Resonance extractions in the {alpha}+{sup 8}He slow scattering. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.014608.
Ito, Makoto, Research Center for Nuclear Physics, RIKEN Nishina Center for Accelerator-based Science, RIKEN, Wako, 351-0198, Saitama, & Suzuki, Daisuke. Resonance extractions in the {alpha}+{sup 8}He slow scattering. United States. doi:10.1103/PHYSREVC.84.014608.
Ito, Makoto, Research Center for Nuclear Physics, RIKEN Nishina Center for Accelerator-based Science, RIKEN, Wako, 351-0198, Saitama, and Suzuki, Daisuke. Fri . "Resonance extractions in the {alpha}+{sup 8}He slow scattering". United States. doi:10.1103/PHYSREVC.84.014608.
@article{osti_21596588,
title = {Resonance extractions in the {alpha}+{sup 8}He slow scattering},
author = {Ito, Makoto and Research Center for Nuclear Physics and RIKEN Nishina Center for Accelerator-based Science, RIKEN, Wako, 351-0198, Saitama and Suzuki, Daisuke},
abstractNote = {The {alpha}+{sup 8}He low-energy reactions and the exotic structures of {sup 12}Be={alpha}+{alpha}+4N are studied by the application of the generalized two-center cluster model. In the two-neutron transfer reactions, {alpha}+{sup 8}He{sub g.s.}{yields}{sup 6}He{sub g.s.}+{sup 6}He{sub g.s.}, resonant structures with a sharp width of {Gamma}<1 MeV appear in the central collision (J{sup {pi}=}0{sup +}). The reaction mechanism is analyzed, and we confirmed that the transfer coupling plays essential roles in the resonance formation with sharp width. Angular distributions for the scattered {sup 6}He are analyzed to extract resonant structures for individual partial waves. We found that, for the low-spin resonances, the angular selection around 90 deg. in the center-of-mass system, which is usually employed in the high-spin resonances of light-ion systems, is not necessarily appropriate to separate the resonance contribution with a definite spin. The validity of the selection angle around 90 deg. is discussed in the higher partial waves.},
doi = {10.1103/PHYSREVC.84.014608},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}