A1 Journal article (refereed)
Transition probabilities in 31P and 31S : A test for isospin symmetry (2021)


Tonev, D., de Angelis, G., Deloncle, I., Goutev, N., De Gregorio, G., Pavlov, P., Pantaleev, I.L., Iliev, S., Yavahchova, M.S., Bizzeti, P.G., Demerdjiev, A., Dimitrov, D.T., Farnea, E., Gadea, A., Geleva, E., He, C.Y., Laftchiev, H., Lenzi, S.M., Lunardi, S., . . . Wirth, H.-F. (2021). Transition probabilities in 31P and 31S : A test for isospin symmetry. Physics Letters B, 821, Article 136603. https://doi.org/10.1016/j.physletb.2021.136603


JYU authors or editors


Publication details

All authors or editorsTonev, D.; de Angelis, G.; Deloncle, I.; Goutev, N.; De Gregorio, G.; Pavlov, P.; Pantaleev, I.L.; Iliev, S.; Yavahchova, M.S.; Bizzeti, P.G.; et al.

Journal or seriesPhysics Letters B

ISSN0370-2693

eISSN1873-2445

Publication year2021

Volume821

Article number136603

PublisherElsevier

Publication countryNetherlands

Publication languageEnglish

DOIhttps://doi.org/10.1016/j.physletb.2021.136603

Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/77833


Abstract

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 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.


Keywordsnuclear physics

Free keywordsmirror nuclei; lifetime measurements; transition probabilities; isospin symmetry; microscopic multiphonon model


Contributing organizations


Ministry reportingYes

Reporting Year2021

JUFO rating2


Last updated on 2024-26-03 at 09:20