6533b7d8fe1ef96bd126acb8

RESEARCH PRODUCT

Measurement of the Dipole Polarizability of the Unstable Neutron-Rich NucleusNi68

A. ChatillonMatthias HeilAndreas WagnerStefanos PaschalisK. SümmererA. KlimkiewiczD. RossiK. BoretzkyThomas NilssonR. KrückenA. Kelic-heilYu. A. LitvinovRalf PlagJ. BenlliureU. Datta PramanikW. WaluśN. KurzM. GórskaMarielle ChartierO. ErshovaP. MaierbeckJ. V. KratzEnrique CasarejosH. EmlingO. KiselevArnd R. JunghansM. WinklerH. Alvarez-polM. LabicheHerbert A. SimonRoy Crawford LemmonThomas AumannHeiko ScheitT. Le BleisA. MovsesyanM. BöhmerD. Cortina-gilRene ReifarthHans GeisselK. MahataHelmut WeickHåkan T JohanssonF. AksouhB. Fernández-domínguezDeniz SavranR. PalitC. NociforoP. Adrich

subject

PhysicsDipolePolarizabilityNuclear TheoryTransition dipole momentGeneral Physics and AstronomyResonanceNeutronCoulomb excitationAtomic physicsElectric dipole transitionNuclear ExperimentRandom phase approximation

description

The E1 strength distribution in Ni68 has been investigated using Coulomb excitation in inverse kinematics at the RB3-LAND setup and by measuring the invariant mass in the one- and two-neutron decay channels. The giant dipole resonance and a low-lying peak (pygmy dipole resonance) have been observed at 17.1(2) and 9.55(17) MeV, respectively. The measured dipole polarizability is compared to relativistic random phase approximation calculations yielding a neutron-skin thickness of 0.17(2) fm. A method and analysis applicable to neutron-rich nuclei has been developed, allowing for a precise determination of neutron skins in nuclei as a function of neutron excess.

yearjournalcountryeditionlanguage
2013-12-10Physical Review Letters
https://doi.org/10.1103/physrevlett.111.242503