0+states inXe130,132: A search for E(5) behavior

Abstract

The level structures of 130,132 Xe were studied with the inelastic neutron scattering reaction followed by γ-ray detection. Level lifetimes were measured using the Doppler-shift attenuation method and low-lying excited states in these nuclei were characterized. With a focus on the decay properties of the 0 + states, these nuclei were examined as representations of the E(5) critical-point symmetry.

High-spin structures in Xe132 and Xe133 and evidence for isomers along the NVogt1, Siciliano2, Birkenbach3 et al. 2017Phys. Rev. C122120View full textAdd to dashboardCite

“…A decreasing trend in lifetimes is observed with increasing proton number Z [12,[16][17][18][19][20][21][22]. Compared to the other N = 78 isotones, the yrast 10 + 1 state in 132 Xe has an exceptionally long half-life of T 1/2 = 8.39 (11) ms [23] and decays predominantly via an 538-keV E3 γ ray to the (7 − 1 ) state, whereas the location of the 8 + 1 state in the level scheme is still unknown [8]. In fact, the long half-life suggests that the 10 + 1 state might be located very close to the 8 + 1 state.…”

“…The available data on low-spin states in both 132 Xe and 133 Xe originate from earlier work employing β decay, Coulomb excitation [8][9][10], and neutron scattering [11]. Intermediate-spin states were investigated via 130 Te(α,2nγ ) [12] and 130 Te(α,nγ ) [13] reactions, respectively.…”

Probing the structure of the stable Xe isotopes with inelastic neutron scattering

“…The complete details of these studies can be found in Ref. [3]. It was further determined that 134 Xe is not a good representation of a vibrational nucleus due to the lack of E2 strength when compared with the harmonic vibrator model [4].…”

“…With seemingly so much knowledge to gain, we chose to perform inelastic neutron scattering (INS) measurements at the University of Kentucky Accelerator Laboratory (UKAL) on 130,132,134,136 Xe. For each of these isotopes, highly enriched gases were converted to approximately 10 grams of solid XeF 2 and γ-ray spectroscopic measurements were performed following INS with nearly monoenergetic neutrons produced by the 3 H(p,n) 3 He reaction. Both angular distribution and excitation function measurements were performed, yielding γray thresholds, which aided in the placement of γ rays from the level of origin, spins and parities, multipole mixing ratios, and level lifetimes via the Doppler-shift attenuation method (DSAM).…”

Exploring the structure of Xe isotopes in A ~ 130 region: Single particle and collective excitations

“…The spectroscopic study on 128 Xe [11] has indicated that 130 Xe can possibly be a better candidate to look for such E(5) symmetry breaking. The structure of 130 Xe was studied using Coulomb excitation in inverse kinematics [11] and (n , n') reaction [12], which concluded that this nucleus may not be the candidate for E(5) symmetry. But to know the detail low lying structures, it is worth to re-investigate the non-yrast and yrast states of 130 Xe.…”