Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570r.884f&link_type=abstract
The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 884-884 (2001).
Physics
Deuteron-Nucleus Scattering, Carbon, Polarisation In Nuclear Reactions And Scattering, Helium, Boron, Nuclear Spin, Nuclear Parity, Nuclear Energy Level Transitions
Scientific paper
The 12C(dvec,2He)12B measurement by Okamura et al. has shown that the spin-dipole resonance bump at Ex~=7.5 MeV in 12B is most probably due mainly to the 2- states. This fact disagrees with the widely accepted assignment as 1-. Motivated by this work we studied the spin-parity of the mirror state located at Ex~=7 MeV in 12N by measuring a complete set of polarization transfer (PT) coefficients for the 12C(pvec,nvec)12N reaction at 0°. We employed a 300 MeV polarized proton beam and the NTOF facility at the Research Center for Nuclear Physics. The PT coefficients enable us to disentangle the bump into spin-parity components as 1ΔS=0-: 1ΔS=1-: 2ΔS=1-=0.08+/-0.02: 0.17+/-0.04: 0.75+/-0.04 in a plane-wave impulse approximation neglecting the contribution of the 0- states. This result clearly indicates that the dominant component of the bump is due to the 2- states and strongly supports the conclusion of Okamura et al. .
Fukusaka S.
Hatanaka K.
Ohnishi Takafumi
Okamura Hidekzu
Sakai Hajime
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