Excited nuclear levels in doubly even Xe isotopes populated in (α, 2n) reactions

Abstract

Using in-beam technique, gamma radiation from excited levels in the even Xe isotopes A = 124, 126, 128, 130 and 132 has been studied. The nuclei are produced in (α, 2n) reactions on enriched Te targets at a bombarding energy of about 28 MeV. From intensity and angular distribution measurements, members of the collective bands having spin and parity of up to 8⁺ or 10⁺ are assigned. On the basis of their angular distributions, a few dipole transitions are classified. These are tentatively interpreted as depopulating odd-parity two-quasi-particle neutron states. Indications of a new isomeric state in ¹³⁰Xe are found. Because of the gamma intensities observed, the transition order is changed in the decay of the earlier known 8.4 ms isomeric state in ¹³²Xe. Preliminary results from similar experiments on Te isotopes using Sn (α, 2n)Te reactions are also reported.