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 -