6533b7d1fe1ef96bd125ce1f
RESEARCH PRODUCT
Transition probabilities in 31P and 31S : A test for isospin symmetry
E. SahinS. IlievS. M. LenziDimitar TonevS. LunardiH.-f. WirthM. S. YavahchovaN. MargineanP. PavlovH. LaftchievR. MenegazzoC. A. UrE. FarneaR. P. SinghG. De AngelisF. RecchiaE. GelevaA. GadeaP. G. BizzetiC. Y. HeI.l. PantaleevD. R. NapoliI. DeloncleM. StoyanovaHeikki PenttiläG. De GregorioF. NowackiD.t. DimitrovN. GoutevA. DemerdjievR. Orlandisubject
Nuclear and High Energy PhysicsLifetime measurementIsoscalarQC1-999Lifetime measurementslifetime measurements[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesResonance (particle physics)Isospin symmetrytransition probabilitiesNuclear physicsMicroscopic multiphonon modelMirror nucleimirror nuclei0103 physical sciencesMirror nucleiIsospin symmetry; Lifetime measurements; Microscopic multiphonon model; Mirror nuclei; Transition probabilities010306 general physicsmirrorTransition probabilitiesPhysicsIsovector010308 nuclear & particles physicsPhysics31SCharge (physics)31PSymmetry (physics)Charged particleisospin symmetryIsospinmicroscopic multiphonon modelnucleiydinfysiikkadescription
International audience; Excited states in the mirror nuclei 31P and 31S were populated in the 1p and 1n exit channels of the reaction 20Ne + 12C, at a beam energy of 33 MeV. The 20Ne beam was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident γ-rays and Doppler-shift attenuation lifetime measurements were performed using the multi-detector array GASP in conjunction with the EUCLIDES charged particle detector. In the observed B(E1) strengths, the isoscalar component, amounting to 24% of the isovector one, provides strong evidence for breaking of the isospin symmetry in the A=31 mass region. Self-consistent beyond mean field calculations using Equation of Motion method based on a chiral potential and including two- and three-body forces reproduce well the experimental B(E1) strengths, reinforcing our conclusion. Coherent mixing from higher-lying states involving the Giant Isovector Monopole Resonance accounts well for the effect observed. The breaking of the isospin symmetry originates from the violation of the charge symmetry of the two- and three-body parts of the potential, only related to the Coulomb interaction.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-10-01 |