TY - JOUR
T1 - Spin-parity assignments in [Formula Presented] by a new method
T2 - [Formula Presented]-delayed spectroscopy for a spin-polarized nucleus
AU - Miyatake, H.
AU - Ueno, H.
AU - Yamamoto, Y.
AU - Aoi, N.
AU - Asahi, K.
AU - Ideguchi, E.
AU - Ishihara, M.
AU - Izumi, H.
AU - Kishida, T.
AU - Kubo, T.
AU - Mitsuoka, S.
AU - Mizoi, Y.
AU - Notani, M.
AU - Ogawa, H.
AU - Ozawa, A.
AU - Sasaki, M.
AU - Shimoda, T.
AU - Shirakura, T.
AU - Takahashi, N.
AU - Tanimoto, S.
AU - Yoneda, K.
PY - 2003
Y1 - 2003
N2 - We propose a method of spin-parity assignments in decay spectroscopy. Its feasibility was tested for the [Formula Presented]-delayed neutron decay of spin-polarized [Formula Presented] The [Formula Presented]-decay asymmetries were measured in coincidence with the delayed neutrons, and the [Formula Presented] values were evaluated for five allowed transitions leading to the excited states in [Formula Presented] 4.220, 4.657, 5.866, and 6.426 MeV). The spin parities of the former three states were uniquely assigned as [Formula Presented] and [Formula Presented] respectively. These assignments are consistent with the previous assignments. Because of insufficient statistics for the 5.866-MeV state [Formula Presented] an incorrect assignment [Formula Presented] could not be excluded within the [Formula Presented] deviation. The spin-parity of the 6.417-MeV state is suggested to be [Formula Presented] The peak analysis with detector response in the neutron time of flight spectra enabled precise determinations of the level energies and widths. The level widths were determined for the first time. The present method is also applicable for [Formula Presented]-delayed proton, [Formula Presented] and [Formula Presented] decays, and it can be a powerful tool for spectroscopic studies of nuclei far from the stability.
AB - We propose a method of spin-parity assignments in decay spectroscopy. Its feasibility was tested for the [Formula Presented]-delayed neutron decay of spin-polarized [Formula Presented] The [Formula Presented]-decay asymmetries were measured in coincidence with the delayed neutrons, and the [Formula Presented] values were evaluated for five allowed transitions leading to the excited states in [Formula Presented] 4.220, 4.657, 5.866, and 6.426 MeV). The spin parities of the former three states were uniquely assigned as [Formula Presented] and [Formula Presented] respectively. These assignments are consistent with the previous assignments. Because of insufficient statistics for the 5.866-MeV state [Formula Presented] an incorrect assignment [Formula Presented] could not be excluded within the [Formula Presented] deviation. The spin-parity of the 6.417-MeV state is suggested to be [Formula Presented] The peak analysis with detector response in the neutron time of flight spectra enabled precise determinations of the level energies and widths. The level widths were determined for the first time. The present method is also applicable for [Formula Presented]-delayed proton, [Formula Presented] and [Formula Presented] decays, and it can be a powerful tool for spectroscopic studies of nuclei far from the stability.
UR - http://www.scopus.com/inward/record.url?scp=85035263398&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.67.014306
DO - 10.1103/PhysRevC.67.014306
M3 - Article
AN - SCOPUS:85035263398
SN - 0556-2813
VL - 67
SP - 9
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 1
ER -