The heaviest bound isotope of boron ^{19}B has been investigated using exclusive measurements of its Coulomb dissociation, into ^{17}B and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold with an integrated E1 strength of B(E1)=1.64±0.06(stat)±0.12(sys) e^{2} fm^{2} for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that ^{19}B has a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant s-wave configuration and exhibit a dineutronlike correlation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.124.212503 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Slab-Specific Projection-Resolved Optical Coherence Tomography Angiography for Enhancing En Face Polyp Detection in Polypoidal Choroidal Vasculopathy.
Invest Ophthalmol Vis Sci
January 2025
Department of Ophthalmology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Purpose: A projection-resolved optical coherence tomography angiography (PR-OCTA) algorithm with slab-specific strategy was applied in polypoidal choroidal vasculopathy (PCV) to differentiate between polyp and branching vascular network (BVN) and improve polyp detection by en face OCTA.
Methods: Twenty-nine participants diagnosed with PCV by indocyanine green angiography (ICGA) and 30 participants diagnosed with typical neovascular age-related macular degeneration (nAMD) were enrolled. Polyps were classified into three categories after using the slab-specific PR algorithm.
The GD-1 Stellar Stream Perturber as a Core-collapsed Self-interacting Dark Matter Halo.
Astrophys J Lett
January 2025
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA;
The GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (CDM) model. In self-interacting dark matter (SIDM), however, a halo could evolve into a phase of gravothermal collapse, resulting in a higher central density than its CDM counterpart.
View Article and Find Full Text PDFDiatom biosilica for liquid chromatography.
J Chromatogr A
December 2024
Nicolaus Copernicus University in Toruń, Interdisciplinary Centre of Modern Technologies, Wileńska 4, 87-100, Toruń, Poland; Nicolaus Copernicus University in Toruń, Faculty of Chemistry, Department of Environmental Chemistry and Bioanalytics, Gagarina 7, PL-87-100 Toruń, Poland; Prof. Jan Czochralski Kuyavian-Pomeranian Research & Development Centre, Krasińskiego Str. 4, 87-100 Toruń, Poland. Electronic address:
This work presents, for the first time, the preparation method and subsequent use of biosilica in column liquid chromatography in reverse-phase mode. Diatom biosilica consists of the siliceous exoskeletons (frustules) of unicellular algae. Controlled cultivation of Pseudostaurosira trainorii diatoms resulted in frustules with an average diameter of approximately 4 µm, sidewall thickness of 1 µm, and a bottom thickness of 110-150 nm.
View Article and Find Full Text PDFPotential of a newly isolated lytic bacteriophage to control Pseudomonas coronafaciens pv. garcae in coffee plants: Molecular characterization with in vitro and ex vivo experiments.
Enzyme Microb Technol
December 2024
VBlab - Laboratory of Bacterial Viruses, University of Sorocaba, Sorocaba, SP 18023-000, Brazil; Department of Biology and CESAM, University of Aveiro, Campus Universitário de Santiago, Aveiro P-3810-193, Portugal. Electronic address:
Traditionally, control of coffee plant bacterial halo blight (BHB) caused by the phytopathogen Pseudomonas coronafaciens pv. garcae (Pcg) involves frequent spraying of coffee plantations with non-environmentally friendly and potentially bacterial resistance-promoting copper products or with kasugamycin hydrochloride. In this study we report a leap forward in the quest for a new ecofriendly approach, characterizing (both physicochemically and biologically) and testing both in vitro and ex vivo a new lytic phage for Pcg.
View Article and Find Full Text PDF3-Halo-3-nitro-aza/thioflavanones: DNMT inhibitors with a two-site binding mode in the hDNMT3A catalytic pocket.
Bioorg Med Chem
November 2024
Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS-Université de Montpellier-ENSCM, 1919 route de Mende, 34296 Montpellier cedex 5, France. Electronic address:
Flavonoid derivatives are natural product analogues that have shown great interest for therapeutic applications as modulators of DNA methylation. In this article we report new synthesis pathways to access ten novel flavonoid derivatives (i.e.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!