Possible Observation of the 1/2^+[880] Orbital in ^249Cm.
Abstract
Shell corrections, which are responsible for the stability of very heavy elements, depend on the location of single-particle states near the Fermi level. A state which has a crucial influence on the magnitude of the shell correction is the k_17/2 single-particle state. This high-j state is very weakly populated in (d,p) reactions and hence has not been identified in previous studies. It is, however, expected to be populated with large cross sections in (^4He,^3He) reactions. We have performed the (^4He,^3He) reaction on a ^248Cm target at the Indiana University Cyclotron Facility using 100 MeV α-particles. Spectra of the emerging ^3He ions were meaured with the K600 magnetic spectrometer at several angles. The three strongest peaks are observed at 0.60, 1.57 and 1.90 MeV. The 0.60 MeV state is assigned to the 15/2 member of the 11/2^-[725] band and the peak at 1.57 MeV is tentatively assigned to the I=17/2 member of the 1/2^+[880] band. Details of the experiment will be presented. Work supported by the US DOE under contract No. W-31-109-ENG-38 and the NSF Grant PHY 48-308-44.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1996
- Bibcode:
- 1996APS..DNP..BE11A