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18 results on '"Deloncle, I."'

1. Deformation of the very neutron-deficient rare-earth nuclei produced with the SPIRAL $^{76}$Kr radioactive beam and studied with EXOGAM + DIAMANT

Author

Redon, N., Prévost, A., Guinet, D., Lautesse, P., Meyer, M., Rossé, B., Stézowski, O., Nolan, P.J., Andreoiu, C., Boston, A.J., Descovich, M., Evans, A.O., Gros, S., Norman, J., Page, R.D., Paul, E.S., Rainovski, G., Sampson, J., de France, G., Casandjian, J.M., Theisen, Ch., Scheurer, J.N., Nyakó, B.M., Gál, J., Kalinka, G., Molnár, J., Dombrádi, Zs., Timár, J., Zolnai, L., Juhász, K., Astier, A., Deloncle, I., Porquet, M.G., Wadsworth, R., Raddon, P., Lee, Y., Wilkinson, A., Joshi, P., Simpson, J., Appelbe, D., Joss, D., Lemmon, R., Smith, J., Cullen, D., Brondi, A., La Rana, G., Moro, R., Vardacci, E., Girod, M., Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), A. Bracco, C.A. Kalfas, EXOGAM, SPIRAL, N., Redon, A., Prévost, D., Guinet, Lautesse, P. h., M., Meyer, B., Rossé, O., Stézowski, P. J., Nolan, C., Andreoiu, A. J., Boston, M., Descovich, A. O., Evan, S., Gro, J., Norman, R. D., Page, E. S., Paul, G., Rainovski, J., Sampson, G., de France, J. M., Casandjian, Theisen, C. h., J. N., Scheurer, B. M., Nyakó, J., Gál, G., Kalinka, J., Molnár, Dombrádi, Z. s., J., Timár, L., Zolnai, K., Juhász, A., Astier, I., Deloncle, M. G., Porquet, R., Wadsworth, P., Raddon, Y., Lee, A., Wilkinson, P., Joshi, J., Simpson, D., Appelbe, D., Jo, R., Lemmon, J., Smith, D., Cullen, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, M., Girod, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
nuclei with mass number 90 to 149, Praseodymium, Nuclear Theory, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Neodymium, Promethium, heavy ion fusion reaction, Nuclear physics, nickel, heavy ion-nucleus scattering, Neutron, Spin (physics), promethium, Nuclear Experiment, krypton, 25.70Jj, 27.40.+z, 27.60.+j, Isotope, Krypton, deformed nuclei, Charged particle, praseodymium, chemistry, Physics::Accelerator Physics, gamma-ray spectra, neodymium
Abstract

Exogam, Diamant, Matière Nucléaire; The structure of the very neutron-deficient rare-earth nuclei has been investigated in the first experiment with the EXOGAM gamma array coupled to the DIAMANT light charged particle detector using radioactive beam of $^{76}$Kr delivered by the SPIRAL facility. Very neutron-deficient Pr, Nd and Pm isotopes have been populated at rather high spin by the reaction $^{76}$Kr + $^{58}$Ni at a beam energy of 328 MeV. We report here the first results of this experiment.

Published
2003

2. Dipole bands and multi-particle excitations in $^{193}Pb$

Author

Ducroux, L, Astier, A, Duffait, R, Le Coz, Y L, Meyer, M R, Perriès, S, Redon, N, Sharpey-Schafer, J F, Wilson, A N, Lucas, R, Méot, V, Collatz, R, Deloncle, I, Hannachi, F, López-Martens, A, Porquet, M G, Schück, C, Azaiez, F, Bouneau, S, Bourgeois, C, Korichi, A, Poffé, N, Sergolle, H, Gall, B J P, Hibbert, I, and Wadsworth, R

Subjects
Nuclear Physics
Published
1996

3. Rotational high spin structures in doubly-odd $^{184}$Au

Author

Ibrahim, F., Hojman, D., Kreiner, A.J., Roussiere, B., Sauvage, J., Bourgeois, C., Korichi, A., Davidson, J., Davidson, M., Debray, M., Deloncle, I., Knipper, A., Le Blanc, F., Marguier, G., Oms, J., Perrin, N., Porquet, M.G., Sergolle, H., Somacal, H., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics
Published
1996

4. Magnetic properties of superdeformed $^{193}$Hg and $^{195}$Ti nuclei

Author

Azaiez, F, Sharpey-Schafer, J F, Duprat, J, Joyce, M J, Aïche, M, Bastin, G, Beausang, C W, Bourgeois, C, Clark, R M, Cullen, D M, Dagnall, P J, Deloncle, I, Fallon, P, Forsyth, P D, Fotiades, N, Gale, S J, Gall, B J P, Hannachi, F, Harissopoulos, S V, Hauschild, K, Hibbert, I, Jones, P M, Kalfas, C A, Kelly, W H, Korichi, A, Le Coz, Y L, Meyer, M R, Paul, E S, Perrin, N, Poffé, N, Porquet, M G, Redon, N, Riley, M A, Sergolle, H, Schück, C, Simpson, J, Twin, P J, Vlastou, R, and Wadworth, R

Subjects
Nuclear Physics
Published
1994

5. High-spin states in the neutron-rich N = 50 region: nuclear structure close to 78Ni.

Author

Astier, A., Porquet, M.-G., Venkova, Ts., Prévost, A., Deloncle, I., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Lucas, R., and Bogachev, A.

Subjects
NEUTRONS, NUCLEAR physics, PARTICLES (Nuclear physics), NUCLEAR energy, PROTONS
Abstract

The spectroscopy of fission fragments, obtained by the 18O+208Pb fusion-fission reaction at 85 MeV bombarding energy, has been performed with the Euroball IV γ-array. High-spin states in many neutron-rich Se, Br, Kr and Rb of the 78Ni region nuclei have been identified for the first time. Several physical aspects which govern the nuclear structure in this mass region are underlined thanks to the new results. Among those, empirical values of the residual proton-neutron interactions have been extracted for the πf5/2xvd5/2 and πp3/2xvd5/2 configurations. [ABSTRACT FROM AUTHOR]

Published
2009
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6. In-Beam γ-Ray Spectroscopy of the N=50 Isotones on the Neutron-Rich Side.

Author

Prévost, A., Astier, A., Deloncle, I., Porquet, M.-G., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Ibrahim, F., Essabaa, S., Meyer, M., Redon, N., Stézowski, O., Venkova, Ts., and Lucas, R.

Subjects
HIGH spin physics, NUCLEAR fission, CONTROLLED fusion, NEUTRONS, NUCLEAR physics, DELAYED neutrons
Abstract

High-spin states of 84Se, produced as a fission fragment in the fusion-fission reaction 18O+208Pb and studied with the EUROBALL IV array, have been identified for the first time. Their interpretation gives new insights about the evolution of the N=50 shell gap at the vicinity of 78Ni. To characterize this evolution, it would be worth using a new device devoted to the high-spin studies of neutron-rich nuclei produced by asymetric fission modes. Such dedicated studies are reported in a second part. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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7. COULOMB EXCITATION OF NI AND ZN ISOTOPES AROUND THE N=40 SUBSHELL CLOSURE.

Author

Sorlin, O., Leenhardt, S., Donzaud, C., Azaiez, F., Amorini, F., Astier, A., Baiborodin, D., Belleguic, M., Bienczak, K., Bourgeois, C., Borcea, C., Brenning, H., Cullen, D. M., Deloncle, I., Dlouhy, Z., Dombrádi, Zs., Dragulescu, E., Duprat, J., Gorska, M., and Grawe, H.

Subjects
COULOMB excitation, ISOTOPES, NUCLEAR energy, NUCLEAR physics, PHOTONS
Published
2002

8. High-spin excitations of 81, 82, 83, 85Se : Competing single-particle and collective structures around N = 50.

Author

Porquet, M., Astier, A., Venkova, Ts., Prévost, A., Deloncle, I., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Lucas, R., and Bogachev, A.

Subjects
NUCLEAR physics, CONTROLLED fusion, SPIN excitations, NUCLEAR reactions, PROTON scattering, NUCLEAR excitation
Abstract

The 81, 82, 83, 85Se nuclei have been produced as fission fragments in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. Their high-spin level schemes have been built from the triple $ \gamma$ -ray coincidence data and $ \gamma$ - $ \gamma$ angular correlations have been analyzed in order to assign spin and parity values to many observed states. The lowest-spin states of the two-neutron and three-neutron configurations are strongly mixed with two-proton excitations among the fp orbits. On the other hand, the highest-spin states of these neutron configurations are found to remain almost pure. Neutron excitation across the N = 50 gap is observed both in 83Se49 and in 85Se51 . [ABSTRACT FROM AUTHOR]

Published
2009
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9. New high-spin states of 142 58Ce and 140 56Ba from fusion-fission reactions: Proton excitations in the N = 84 isotones.

Author

Venkova, Ts., Porquet, M.-G., Deloncle, I., Petkov, P., Astier, A., Prévost, A., Azaiez, F., Bogachev, A., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Durell, J., Gall, B. J. P., Houry, M., Khalfallah, F., Lucas, R., Meyer, M., Piqueras, I., and Redon, N.

Subjects
HADRONS, NUCLEAR fission, NUCLEAR reactions, PARTICLES (Nuclear physics), NUCLEAR physics
Abstract

High-spin states in the 142Ce and 140Ba nuclei have been populated in the 12C + 238U and 18O + 208Pb fusion-fission reactions at 90MeV and 85MeV bombarding energy, respectively. The emitted γ -radiation was detected using the Euroball III and IV arrays. The high-spin yrast and near-to-yrast structures of 142Ce have been considerably extended. The level scheme of 140Ba has been extended by six new levels. The newly observed structures in these N = 84 isotones are discussed by analogy with the neighbouring nuclei. [ABSTRACT FROM AUTHOR]

Published
2007
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10. Fission fragment properties obtained in the γ - γ - γ coincidence method in the reaction 208Pb(18O, f ).

Author

Bogachev, A., Krupa, L., Dorvaux, O., Kozulin, E., Itkis, M., Porquet, M.-G., Astier, A., Curien, D., Deloncle, I., Duchene, G., Gall, B. J. P., Hanappe, F., Khalfallah, F., Rousseau, M., Stuttge, L., Redon, N., and Stezowski, O.

Subjects
NUCLEAR fission, NEUTRON beams, NEUTRON multiplicity, NUCLEAR physics, NUCLEAR reactions
Abstract

Independent fission fragment yields have been obtained for the six fragment pairs ( Z L/ Z H = 44/46 , 42/48, 40/50, 38/52, 36/54 and 34/56) in 208Pb(18O, f ) at the beam energy E = 85 MeV. γ -ray spectroscopy technique was applied to analyze the experimental data. With use of these data the mass distribution of fission fragments was restored. Data on average fragment spin distribution and total neutron multiplicity are presented. The agreement of the obtained results with other experimental data proves the validity of the applied method to solve this kind of problems. [ABSTRACT FROM AUTHOR]

Published
2007
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11. Beyond the N = 50 shell closure: High-spin excitations of 87Kr and ground-state spin of 87Br.

Author

Porquet, M., Venkova, Ts., Astier, A., Deloncle, I., Prévost, A., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Lucas, R., and Bogachev, A.

Subjects
NUCLEAR shell theory, NUCLEAR fission, KRYPTON isotopes, NUCLEAR physics, FISSION gases
Abstract

The 87Kr nucleus has been produced as fission fragment in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. High-spin states of this neutron-rich isotope have been identified for the first time. Its level scheme has been obtained up to 6.3MeV excitation energy and spin I ∼ 23/2ℏ. Its structure is interpreted by analogy with those of the heavier isotones. The proposed configurations involve both proton and neutron excitations from several sub-shells located close to the Fermi levels, particularly ν d 5/2, π p 3/2 f 5/2 and π g 9/2. Moreover, a revised spin value of 5/2- for the 87Br ground state is proposed. [ABSTRACT FROM AUTHOR]

Published
2006
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12. Medium-spin excitations of the neutron-rich84Se isotope: Possible decrease in energy of the N = 50 neutron-core excitation.

Author

A. Prévost, Porquet, M. G., Astier, A., Deloncle, I., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Venkova, Ts., Lucas, R., and Bogachev, A.

Subjects
NUCLEAR shell theory, PARTICLES (Nuclear physics), NEUTRONS, SPIN excitations, NUCLEAR excitation, NUCLEAR physics
Abstract

The84Se nucleus has been produced as fission fragment in the fusion reaction18O +208Pb at 85MeV bombarding energy and studied with the Euroball IV array. Medium-spin states of this neutron-rich isotope have been identified for the first time. Its level scheme has been obtained up to 4.9MeV excitation energy and spinI~ 7?. Its structure is interpreted by analogy with those of the stable heavier isotones. The evolution of the energy of theN= 50 neutron-core excitation is discussed as a function of the proton number. [ABSTRACT FROM AUTHOR]

Published
2004
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13. Evolution of the ... configuration in the neutron-rich ... and ... isotopes.

Author

Porquet, M.-G., Venkova, Ts., Astier, A., Bauchet, A., Deloncle, I., Buforn, N., Donadille, L., Dorvaux, O., Gall, B. J. P., Lalkovski, S., R. Lucas, Meyer, M., Minkova, A., Prévost, A., Redon, N., Schulz, N., and Stézowski, O.

Subjects
PARTICLES (Nuclear physics), NUCLEAR physics, NUCLEAR fission, NUCLEAR reactions, RHODIUM isotopes, SILVER isotopes
Abstract

The 110,112 Rh and 114',16Ag nuclei have been produced as fission fragments in the fusion reaction 18 + 208Pb at 85 MeV. Their level schemes have been built from gamma-rays detected using the Euroball IV array. High-spin states of these neutron-rich nuclei have been identified for the first time. The yrast structures consist of rotational bands in which the odd proton occupies the πg9/2 sub-shell and the odd neutron the vh11/2 sub-shell. The evolution of the πg9/2 ® vh11/2 band structure is analyzed as a function of the neutron number. [ABSTRACT FROM AUTHOR]

Published
2003
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14. B(E2: 01+→21+) behavior around 68Ni : seniority and p-n interaction.

Author

Deloncle, I. and Roussière, B.

Subjects
*NEUTRONS, *PARTICLES (Nuclear physics), *NUCLEAR physics, *PHYSICS, *NICKEL
Abstract

The B(E2: 01+ → 21+) (B(E2)↑) transition probability of even-even nuclei from 56Ni up to 82Se are confronted with curves obtained in a approximation to the generalized seniority and shown to fit in with a neutron sub-shell closure at N=38 and a scenario involving p-n interaction. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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15. Experimental Sign of a Weakening of the N=50 Spherical Shell Gap.

Author

Prévost, A., Astier, A., Deloncle, I., Porquet, M.-G., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Venkova, Ts., Lucas, R., and Bogachev, A.

Subjects
PARTICLES (Nuclear physics), NUCLEAR physics, NUCLEAR fusion, NUCLEAR fission, NUCLEAR reactions
Abstract

High-spin states of 84Se, produced as a fission fragment in the fusion-fission reaction 18O+208Pb, have been identified for the first time thanks to the EUROBALL IV array. The excitation energies of three of these states, interpreted as being due to the (νg9/2-1 νd5/2+1) neutron-core excitation, give new insights about the evolution of the N=50 shell gap at the vicinity of 78Ni. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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16. Configurations of superdeformed bands in $^{193}$Pb

Author

Ducroux, L., Astier, A., Duffait, R., Le Coz, Y., Meyer, M., Perriès, S., Redon, N., Sharpey-Schafer, J. F., Wilson, A. N., Gall, B. J. P., Collatz, R., Deloncle, I., Hannachi, F., Araceli Lopez-Martens, Porquet, M. G., Schuck, C., Azaiez, F., Bouneau, S., Bourgeois, C., Korichi, A., Poffe, N., Sergolle, H., Lucas, R., Meot, V., Hibbert, I., Wadsworth, R., Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics

17. Superdeformed nuclear matter in nuclei with Z ≥ 82 : Magnetic properties and neutron shell gap.

Author

Redon, N., Buforn, N., Duffait, R., Lautesse, P., Meyer, M., Pr&eacue;vost, A., Stézowski, O., Astier, A., Bauchet, A., Deloncle, I., Porquet, M. G., Domscheit, J., Goergen, A., Hübel, H., Mergel, E., Neumann, S., Rossbach, D., Nenoff, N., Schoenwasser, G., and Wilson, A. N.

Subjects
NUCLEAR physics, PHYSICS, NEUTRONS, CONSTITUTION of matter, PARTICLES (Nuclear physics), SPECTROMETERS
Abstract

We report the results of an experiment, realized with the EUROBALL IV spectrometer, in which superdeformed (SD) states have been populated in 197,198Pb nuclei. Crosstalk transitions between two signature partner SD bands in 197Pb have been observed with an established Mi character, giving access to the magnetic properties of the v[752]5/2 intruder orbital. Six new SD bands have been identified in 197,198Pb. The results are interpreted in the framework of cranked Hartree-Fock calculations. A mixing between quasi-particle excitations and an octupole vibration is suggested in the two SD isotopes. [ABSTRACT FROM AUTHOR]

Published
2004
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18. Transition probabilities in 31P and 31S : A test for isospin symmetry

Author

E. Sahin, S. Iliev, S. M. Lenzi, Dimitar Tonev, S. Lunardi, H.-F. Wirth, M. S. Yavahchova, N. Marginean, P. Pavlov, H. Laftchiev, R. Menegazzo, C. A. Ur, E. Farnea, R. P. Singh, G. de Angelis, F. Recchia, E. Geleva, A. Gadea, P. G. Bizzeti, C. Y. He, I.L. Pantaleev, D. R. Napoli, I. Deloncle, M. Stoyanova, Heikki Penttilä, G. De Gregorio, F. Nowacki, D.T. Dimitrov, N. Goutev, A. Demerdjiev, R. Orlandi, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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., Marginean, N., Menegazzo, R., Napoli, D. R., Nowacki, F., Orlandi, R., Penttila, H., Recchia, F., Sahin, E., Singh, R. P., Stoyanova, M., Ur, C. A., and Wirth, H. -F.

Subjects
Nuclear and High Energy Physics, Lifetime measurement, Isoscalar, QC1-999, Lifetime measurements, lifetime measurements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), Isospin symmetry, transition probabilities, Nuclear physics, Microscopic multiphonon model, Mirror nuclei, mirror nuclei, 0103 physical sciences, Transition probabilities, 010306 general physics, mirror, Physics, Isovector, 010308 nuclear & particles physics, 31S, Charge (physics), 31P, Symmetry (physics), Charged particle, isospin symmetry, Isospin, microscopic multiphonon model, nuclei, ydinfysiikka
Abstract

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.

Published
2021

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