Low-lying neutron unbound states inBe12

Neutron radioactivity—Lifetime measurements of neutron-unbound states

A new technique to measure the lifetime � of a neutron-radioactive nucleus that decays in-flight via neutron emission is presented and demonstrated utilizing MonteCarlo simulations. The method is based on the production of the neutron-unbound nucleus in a target, which at the same time slows down the produced nucleus and the residual nucleus after (multi-) neutron emission. The spectrum of the ...

Low-lying 2 states in neutron-rich oxygen isotopes in quasiparticle random phase approximation

The properties of the low-lying, collective 2+1 states in neutron-rich oxygen isotopes are investigated in the framework of self-consistent microscopic models with effective Skyrme interactions. In RPA the excitation energies E 2 + 1 can be well described but the transition probabilities are much too small as compared to experiment. Pairing correlations are then accounted for by performing quas...

Low-lying negative-ion states of calcium.

Effects of phonon - phonon coupling on low - lying states in neutron - rich Sn isotopes

Starting from an effective Skyrme interaction we present a method to take into account the coupling between oneand two-phonon terms in the wave functions of excited states. The approach is a development of a finite rank separable approximation for the quasiparticle RPA calculations proposed in our previous work. The influence of the phonon-phonon coupling on energies and transition probabilitie...

Low-lying electronic states of cyclopentadienone.

We report a combined experimental and theoretical study of the low-lying electronic states of cyclopentadienone (C5H4O). The cyclopentadienone anion (C5H4O(-)) was generated in the gas phase via reaction of atomic oxygen radical anions (O(-)) with cyclopentanone (C5H8O). Photoelectron imaging was used to gain access to the first three electronic states of C5H4O, including the X (1)A1 ground sta...