English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

15Be is expected to have low-lying 3/2+ and 5/2+ states. A first search didnot observe the 3/2+ [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)],however, a resonance in 15Be was populated in a second attempt and determinedto be unbound with respect to 14Be by 1.8(1) MeV with a tentative spin-parityassignment of 5/2+ [J. Snyder et al., Phys. Rev. C 88, 031303(R) (2013)].Search for the predicted 15Be 3/2+ state in the three-neutron decay channel. Atwo-proton removal reaction from a 55 MeV/u 17C beam was used to populateneutron-unbound states in 15Be. The two-, three-, and four-body decay energiesof the 12Be + neutron(s) detected in coincidence were reconstructed usinginvariant mass spectroscopy. Monte Carlo simulations were performed to extractthe resonance and decay properties from the observed spectra. The low-energyregions of the decay energy spectra can be described with the first excitedunbound state of 14Be (E_x=1.54 MeV, E_r=0.28 MeV). Including a state in 15Bethat decays through the first excited 14Be state slightly improves the fit athigher energies though the cross section is small. A 15Be component is notneeded to describe the data. If the 3/2+ state in 15Be is populated, the decayby three-neutron emission through 14Be is weak, less than or equal to 11% up to4 MeV. In the best fit, 15Be is unbound with respect to 12Be by 1.4 MeV(unbound with respect to $14Be by 2.66 MeV) with a strength of 7%.

Search for unbound 15Be states in the 3n+12Be channel