TY - JOUR
T1 - Low-lying [Formula Presented] strength in [Formula Presented]
AU - Tryggestad, E.
AU - Baumann, T.
AU - Heckman, P.
AU - Thoennessen, M.
AU - Aumann, T.
AU - Bazin, D.
AU - Blumenfeld, Y.
AU - Beene, J. R.
AU - Lewis, T. A.
AU - Radford, D. C.
AU - Shapira, D.
AU - Varner, R. L.
AU - Chartier, M.
AU - Halbert, M. L.
AU - Liang, J. F.
PY - 2003
Y1 - 2003
N2 - Intermediate energy Coulomb excitation at 100 MeV/nucleon was used to probe the low-lying level structure of both [Formula Presented] and [Formula Presented] in the region between 1 and 8 MeV. Discrete [Formula Presented] states with energies of 5.35(10) and 6.85(5) MeV were observed in [Formula Presented] The strong direct excitation and subsequent [Formula Presented]-ray decay of these states, along with [Formula Presented] predictions for [Formula Presented] levels in this energy region, established their dipole character. The extracted [Formula Presented] values of [Formula Presented] and [Formula Presented] for the 5.35- and 6.85-MeV states, respectively, are significantly larger than shell model calculations, though modification of the single-particle energies, in particular, the [Formula Presented] shell gap, improves the agreement. The summed [Formula Presented] value for these levels (in Weisskopf units) is consistent with that for other nuclei that have been discussed recently in the literature as potential Pygmy dipole resonance hosts.
AB - Intermediate energy Coulomb excitation at 100 MeV/nucleon was used to probe the low-lying level structure of both [Formula Presented] and [Formula Presented] in the region between 1 and 8 MeV. Discrete [Formula Presented] states with energies of 5.35(10) and 6.85(5) MeV were observed in [Formula Presented] The strong direct excitation and subsequent [Formula Presented]-ray decay of these states, along with [Formula Presented] predictions for [Formula Presented] levels in this energy region, established their dipole character. The extracted [Formula Presented] values of [Formula Presented] and [Formula Presented] for the 5.35- and 6.85-MeV states, respectively, are significantly larger than shell model calculations, though modification of the single-particle energies, in particular, the [Formula Presented] shell gap, improves the agreement. The summed [Formula Presented] value for these levels (in Weisskopf units) is consistent with that for other nuclei that have been discussed recently in the literature as potential Pygmy dipole resonance hosts.
UR - http://www.scopus.com/inward/record.url?scp=84873375351&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.67.064309
DO - 10.1103/PhysRevC.67.064309
M3 - Article
AN - SCOPUS:84873375351
SN - 0556-2813
VL - 67
SP - 14
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 6
ER -