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39 results on '"Deloncle, I."'

1. Simultaneous impacts of nuclear shell structure and collectivity on $\beta$-decay: evidence from $^{80}$Ga$_{49}$

Author

Li, R., Verney, D., De Gregorio, G., Mancino, R., Matea, I., Coraggio, L., Itaco., N., Harakeh, M. N., Delafosse, C., Didierjean, F., Ayoubi, L. A., Falou, H. Al, Benzoni, G., Blanc, F. Le, Bozkurt, V., Ciemała, M., Deloncle, I., Fallot, M., Gaulard, C., Gottardo, A., Guadilla, V., Guillot, J., Hadyńska-Klęk, K., Ibrahim, F., Jovancevic, N., Kankainen, A., Lebois, M., Martínez, T., Napiorkowski, P., Roussiere, B., Sobolev, Yu. G., Stefan, I., Stukalov, S., Thisse, D., and Tocabens, G.

Subjects
Nuclear Experiment
Abstract

The Gamow-Teller strength distribution covering the entire $\beta$-decay window, up to 10.312(4) MeV, of $^{80g+m}$Ga was measured for the first time in photo-fission of UC$_x$ induced by 50 MeV electron beam. The new data show significant enhancement in the high-energy region with a jump-structure. Simultaneously, the $\gamma$ de-exciting behavior of $\beta$-populated states presents a competition between de-excitation to 2$_1^+$ [$\beta_2$ = 0.155(9)] and to 2$_2^+$ [$\beta_2$ = 0.053$_{0.009}^{0.008}$)] in $^{80}$Ge. Based on these facts and combined with a realistic shell model calculation and systematic analysis of logft ratio between precursor $\beta$-decay to 2$_2^+$ and to 2$_1^+$ of Ga isotopes, we conclude that these phenomena evidence simultaneous impacts of nuclear shell structure and collectivity on B(GT) and its distribution and, therefore, the half-life of the precursor. These data prove that the nucleus as a multi-nucleon correlated quantum system reacts as a whole when $\beta$-decay occurs in contrast to simple single-particle excitation. Additionally, the comparison with the theoretical results evidence how challenging is the description of the experimental data obtained, and render this experimental outcome a sound test for the theoretical models.

Published
2024

2. High-resolution spectroscopy of neutron-rich Br isotopes and signatures for a prolate-to-oblate shape transition at N=56

Author

Dudouet, J., Colombi, G., Tello, D. Reygadas, Michelagnoli, C., Dao, D. D., Nowacki, F., Abushawish, M., Clément, E., Costache, C., Duchêne, G., Kandzia, F., Lemasson, A., Marginean, N., Marginean, R., Mihai, C., Pascu, S., Rejmund, M., Rezynkina, K., Stezowski, O., Turturica, A., Ujeniuc, S., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Gadea, A., Gottardo, A., Jones, P., Konstantinopoulos, T., Kuti, I., Blanc, F. Le, Lenzi, S. M., Lozeva, R., Million, B., Pérez-Vidal, R. M., Petrache, C. M., Ralet, D., Redon, N., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The first systematic experimental study of the neutron-rich Br isotopes with two complementary state-of-the-art techniques is presented. These isotopes have been populated in the fission process at two different facilities, GANIL and ILL. New spectroscopic information has been obtained for odd-even $^{87-93}$Br isotopes and the experimental results have been compared with state-of-the-art Large-Scale Shell-Model and DNO Shell-Model calculations. As a result of such theoretical approaches, a transition from prolate ($^{87,89}$Br) to oblate ($^{91,93}$Br) shapes is obtained from the subtle balance between proton and neutron quadrupole deformations, as a clear signature of pseudo-SU3 quadrupole regime., Comment: 17 pages, 24 figures, 5 tables

Published
2024

3. Gamma-ray emission in proton-induced nuclear reactions on natC and Mylar targets over the incident energy range of Ep = 30-200 MeV. Astrophysical implications

Author

Rahma, Y., Ouichaoui, S., Kiener, J., Lawrie, E. A., Lawrie, J. J., Tatischeff, V., Belhout, A., Moussa, D., Yahia-Cherif, W., Benhabiles-Mezhoud, H., Bucher, T. D., Dinoko, T. R. S., Chafa, A., Conradie, J. L., Damache, S., Debabi, M., Deloncle, I., Easton, J. L., Fouka, M., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N. A., Lamula, T., Majola, S. N. T., Ndayishimye, J., Negi, D., Noncolela, S. P., Ouziane, S., Papka, P., Peterson, S, Raju, M. Kumar, Ramanathan, V., Rebeiro, B. M., de Séréville, N., Sharpey-Schafer, J. F., Shirinda, O., Wiedeking, M., and Wyngaardt, S.

Subjects
Nuclear Experiment
Abstract

We have measured the gamma-ray line production cross sections in proton-induced nuclear reactions on various target nuclei abundant in astrophysical sites over the incident energy range of Ep = 30 - 200 MeV. We carried out experimental campaigns in joint collaboration at the K = 200 cyclotron of iThemba LABS using a high-energy resolution, high-efficiency detection array composed of 8 Compton-suppressed clover detectors comprising 32 HP-Ge crystals for recording the gamma-ray spectra. In the current paper, we focus on de-excitation lines produced in proton irradiations of natC and Mylar targets. In particular, on the prominent 4.439 and 6.129 MeV lines of $^{12}$C and $^{16}$O which are among the strongest lines emitted in solar flares and in interactions of low-energy cosmic rays with the gas and dust of the inner galaxy. We report new gamma-ray production experimental cross section data for ten nuclear lines that we compare to previous low-energy data sets from the literature, to the predictions of the TALYS code of modern nuclear reactions and to a semi-empirical compilation. In first approach, performing calculations with default input parameters of TALYS we observed substantial deviations between the predicted cross sections and experimental data. Then, using modified optical model potential and nuclear level deformation parameters as input data we generated theoretical excitation functions for the above two main lines fully consistent with experimental data. In contrast, the experimental data sets for the other eight analyzed lines from the two proton-irradiated targets exhibit significant deviations with the predicted cross section values. We also report line-shape experimental data for the line complex observed at $E_g$ = 4.44 MeV in irradiations of the two targets. Finally, we emphasize the astrophysical implications of our results., Comment: 44 pages, 7 tables, 13 figures

Published
2022
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4. Structure of $^{83}$As, $^{85}$As and $^{87}$As: from semi-magicity to $\gamma$-softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Blanc, F. Le, Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Nuclear Experiment
Abstract

The structure of $^{83}$As, $^{85}$As and $^{87}$As have been studied in fusion-fission reaction $^{238}$U+$^9$Be. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident $\gamma$-rays were detected in the $\gamma$-ray tracking array AGATA. New transitions in $^{83}$As and $^{85}$As are reported and placed in the level schemes. A level scheme of the excited states in $^{87}$As is proposed for the first time. The data are interpreted in frame of Large-Scale Shell-Model calculations, SU3 symmetries and Beyond Mean-Field frameworks. A spherical regime at magic number $N$=50 is predicted and the location of the proton $g_{9/2}$ orbital is proposed for the first time. Development of collectivity in a prolate deformed, $\gamma$-soft regime in the open shell cases $^{85}$As and $^{87}$As, most neutron-rich isotopes beyond $N$=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the $9/2^+$ state in $^{79}$Cu, one proton above $^{78}$Ni.

Published
2022
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5. Reexamination of $^{6}$Li scattering as a Probe to Investigate the Isoscalar Giant Resonances in Nuclei

Author

Zamora, J. C., Sullivan, C., Zegers, R. G. T., Aoi, N., Batail, L., Bazin, D., Carpenter, M., Carroll, J. J., Deloncle, I., Fang, Y. D., Fujita, H., Garg, U., Gey, G., Guess, C. J., Harakeh, M. N., Hoang, T. H., Hudson, E., Ichige, N., Ideguchi, E., Inoue, A., Isaak, J., Iwamoto, C., Kacir, C., Kobayashi, N., Koike, T., Raju, M. Kumar, Lipschutz, S., Liu, M., von Neumann-Cosel, P., Noji, S., Ong, H. J., Péru, S., Pereira, J., Schmitt, J., Tamii, A., Titus, R., Werner, V., Yamamoto, Y., Zhou, X., and Zhu, S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Inelastic ${}^{6}$Li scattering at 100 MeV/u on ${}^{12}$C and ${}^{93}$Nb have been measured with the high-resolution magnetic spectrometer Grand Raiden. The magnetic-rigidity settings of the spectrometer covered excitation energies from 10 to 40 MeV and scattering angles in the range $0^\circ < \theta_{\text{lab.}}< 2^\circ$. The isoscalar giant monopole resonance was selectively excited in the present data. Measurements free of instrumental background and the very favorable resonance-to-continuum ratio of ${}^{6}$Li scattering allowed for precise determination of the $E0$ strengths in ${}^{12}$C and ${}^{93}$Nb. It was found that the monopole strength in ${}^{12}$C exhausts $52 \pm 3^\text{(stat.)} \pm 8 ^\text{(sys.)}$\% of the energy-weighted sum rule (EWSR), which is considerably higher than results from previous $\alpha$-scattering experiments. The monopole strength in ${}^{93}$Nb exhausts $92 \pm 4^\text{(stat.)} \pm 10 ^\text{(sys.)}$\% of the EWSR, and it is consistent with measurements of nuclei with mass number of $A\approx90$. Such comparison indicates that the isoscalar giant monopole resonance distributions in these nuclei are very similar, and no influence due to nuclear structure was observed., Comment: 6 Figures

Published
2020
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6. Shape coexistence in the neutron-deficient $^{188}$Hg investigated via lifetime measurements

Author

Siciliano, M., Zanon, I., Goasduff, A., John, P. R., Rodríguez, T. R., Péru, S., Deloncle, I., Libert, J., Zielińska, M., Ashad, D., Bazzacco, D., Benzoni, G., Birkenbach, B., Boso, A., Braunroth, T., Cicerchia, M., Cieplicka-Oryńczak, N., Colucci, G., Davide, F., de Angelis, G., de Canditiis, B., Gadea, A., Gaffney, L. P., Galtarossa, F., Gozzelino, A., Hadyńska-Klȩk, K., Jaworski, G., Koseoglou, P., Lenzi, S. M., Melon, B., Menegazzo, R., Mengoni, D., Nannini, A., Napoli, D. R., Pakarinen, J., Quero, D., Rath, P., Recchia, F., Rocchini, M., Testov, D., Valiente-Dobón, J. J., Vogt, A., Wiederhold, J., and Witt, W.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Shape coexistence in the $Z \approx 82$ region has been established in mercury, lead and polonium isotopes. Even-even mercury isotopes with $100 \leq N \leq 106$ present multiple fingerprints of this phenomenon, which seems to be no longer present for $N \geq 110$. According to a number of theoretical calculations, shape coexistence is predicted in the $^{188}$Hg isotope. The $^{188}$Hg nucleus was populated using two different fusion-evaporation reactions with two targets, $^{158}$Gd and $^{160}$Gd, and a beam of $^{34}$S, provided by the Tandem-ALPI accelerators complex at the Laboratori Nazionali di Legnaro. The channels of interest were selected using the information from the Neutron Wall array, while the $\gamma$ rays were detected using the GALILEO $\gamma$-ray array. The lifetimes of the excited states were determined using the Recoil Distance Doppler-Shift method, employing the dedicated GALILEO plunger device. Using the two-bands mixing and rotational models, the deformation of the pure configurations was obtained from the experimental results. The extracted transition strengths were compared with those calculated with the state-of-the-art symmetry-conserving configuration-mixing (SCCM) and five-dimentional collective Hamiltonian (5DCH) approaches in order to shed light on the nature of the observed structures in the $^{188}$Hg nucleus. An oblate, a normal- and a super-deformed prolate bands were predicted and their underlying shell structure was also discussed., Comment: v1: 13 pages, 10 figures, comparison between IBM-CM and SCCM calculations; v2: 16 pages, 13 figures, discussion on the mixing amplitudes from the experimental B(E2) values, comparison between SCCM and 5DCH calculations

Published
2020
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7. Measurement and analysis of nuclear $\gamma$-ray production cross sections in proton interactions with Mg, Si and Fe nuclei abundant in astrophysical sites over the incident energy range $E=30-66$ MeV

Author

Yahia-Cherif, W., Ouichaoui, S., Kiener, J., Lawrie, E. A., Lawrie, J. J., Tatischeff, V., Belhout, A., Moussa, D., Papka, P., Benhabiles, H., Bucher, T. D., Chafa, A., Conradie, J. L., Damache, S., Debabi, M., Deloncle, I., Easton, J. L., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N. A., Lamula, T., Majola, S. N. T., Ndayishimye, J., Negi, D., Noncolela, S. P., de Séréville, N., Sharpey-Schafer, J. F., Shirinda, O., Wiedeking, M., and Wyngaardt, S.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract

Gamma-ray production cross section excitation functions have been measured for $30$, $42$, $54$ and $66$ MeV proton beams accelerated onto targets of astrophysical interest, $^{nat}$C, C + O (Mylar), $^{nat}$Mg, $^{nat}$Si and $^{56}$Fe, at the Sector Separated Cyclotron (SSC) of iThemba LABS (near Cape Town, South Africa). The AFRODITE array equipped with 8 Compton suppressed HPGe clover detectors was used to record $\gamma$-ray data. For known, intense $\gamma$-ray lines the previously reported experimental data measured up to $E_{p}\simeq$ $25$ MeV at the Washington and Orsay tandem accelerators were extended to higher proton energies. Our experimental data for the last 3 targets are reported here and discussed with respect to previous data and the Murphy \textit{et al.} compilation [ApJS 183, 142 (2009)], as well as to predictions of the nuclear reaction code TALYS. The overall agreement between theory and experiment obtained in first-approach calculations using default input parameters of TALYS has been appreciably improved by using modified optical model potential (OMP), deformation, and level density parameters. The OMP parameters have been extracted from theoretical fits to available experimental elastic/inelastic nucleon scattering angular distribution data by means of the coupled-channels reaction code OPTMAN. Experimental data for several new $\gamma$-ray lines are also reported and discussed. The astrophysical implications of our results are emphasised., Comment: 22 pages, 10 figures, five tables; regular article submitted to Phys Rev C

Published
2020
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8. Gamma-ray emission in alpha-particle reactions with C, Mg, Si, Fe

Author

Kiener, J., Bundesmann, J., Deloncle, I., Denker, A., Tatischeff, V., Gostojic, A., Hamadache, C., Röhrich, J., Benhabiles, H., Bougaoub, I., Coc, A., Hammache, F., and Peyré, J.

Subjects
Nuclear Experiment, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Cross sections for the strongest gamma-ray emission lines produced in alpha-particle reactions with C, Mg, Si, Fe have been measured in the range E_alpha = 50 - 90 MeV at the center for proton therapy at the Helmholtz-Zentrum Berlin. Data for more than 60 different gamma-ray lines were determined, with particular efforts for lines that are in cross section compilations/evaluations with astrophysical purpose, and where data exist at lower projectile energies. The data are compared with predictions of a modern nuclear reaction code and cross-section curves of the latest evaluation for gamma-ray line emission in accelerated-particle interactions in solar flares., Comment: 5 pages, 5 figures, contribution to the XXIII International School on Nuclear Physics, Neutron Physics and Applications, Varna, Bulgaria, September 22-28, 2019

Published
2020
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9. Fast-neutron induced background in LaBr3:Ce detectors

Author

Kiener, J., Tatischeff, V., Deloncle, I., de Séréville, N., Laurent, P., Blondel, C., Chabot, M., Chipaux, R., Coc, A., Dubos, S., Gostojic, A., Goutev, N., Hamadache, C., Hammache, F., Horeau, B., Limousin, O., Ouichaoui, S., Prévot, G., Rodríguez-Gasén, R., and Yavahchova, M. S.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, Nuclear Experiment
Abstract

The response of a scintillation detector with a cylindrical 1.5-inch LaBr3:Ce crystal to incident neutrons has been measured in the energy range En = 2-12 MeV. Neutrons were produced by proton irradiation of a Li target at Ep = 5-14.6 MeV with pulsed proton beams. Using the time-of-flight information between target and detector, energy spectra of the LaBr3:Ce detector resulting from fast neutron interactions have been obtained at 4 different neutron energies. Neutron-induced gamma rays emitted by the LaBr3:Ce crystal were also measured in a nearby Ge detector at the lowest proton beam energy. In addition, we obtained data for neutron irradiation of a large-volume high-purity Ge detector and of a NE-213 liquid scintillator detector, both serving as monitor detectors in the experiment. Monte-Carlo type simulations for neutron interactions in the liquid scintillator, the Ge and LaBr3:Ce crystals have been performed and compared with measured data. Good agreement being obtained with the data, we present the results of simulations to predict the response of LaBr3:Ce detectors for a range of crystal sizes to neutron irradiation in the energy range En = 0.5-10 MeV, Comment: 28 pages, 10 figures, 4 Tables

Published
2015
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10. Gamma ray production cross sections in proton induced reactions on natural Mg, Si and Fe targets over the proton energy range 30 up to 66 MeV

Author

Yahia-Chérif, W., Ouichaoui, S., Kiener, J., Tatischeff, V., Lawrie, E., Lawrie, J. J., Belhout, A., Benhabiles, H., Bucher, T. D., Chafa, A., Damache, S., Debabi, M., Deloncle, I., Easton, J. L., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N., Lamula, T., Majola, S. T. H., Negi, D., Ndayishimye, J., Noncolela, S. P., Moussa, D., Nchodu, R., Papka, P., de Sereville, N., Sharpey-Schafer, J. F., Shirinda, O., Wiedeking, M., and Wyngaardt, S.

Subjects
Nuclear Experiment
Abstract

Gamma-ray excitation functions have been measured for 30, 42, 54 and 66 MeV proton beams accelerated onto C + O (Mylar), Mg, Si, and Fe targets of astrophysical interest at the separate-sector cyclotron of iThemba LABS in Somerset West (Cape Town, South Africa). A large solid angle, high energy resolution detection system of the Eurogam type was used to record Gamma-ray energy spectra. Derived preliminary results of Gamma-ray line production cross sections for the Mg, Si and Fe target nuclei are reported and discussed. The current cross section data for known, intense Gamma-ray lines from these nuclei consistently extend to higher proton energies previous experimental data measured up to Ep ~ 25 MeV at the Orsay and Washington tandem accelerators. Data for new Gamma-ray lines observed for the first time in this work are also reported., Comment: 11 pages, 6 figures. IOP Institute of Physics Conference Nuclear Physics in Astrophysics VII, 28th EPF Nuclear Physics Divisional Conference, May 18-22 2015, York, UK

Published
2015

11. Nuclear structure studies in mirror nuclei

Author

Tonev, D., primary, de Angelis, G., additional, Deloncle, I., additional, Goutev, N., additional, De Gregorio, G., additional, Pantaleev, I. L., additional, Demerdjiev, A., additional, Geleva, E., additional, Dimitrov, D. T., additional, Genchev, S. G., additional, Lakov, N., additional, Lalev, V. L., additional, and Yavahchova, M.S., additional

Published
2023
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12. Experimental observation of the M1 scissors mode in 254No

Author

Bello Garrote, F.L., primary, Lopez-Martens, A., additional, Larsen, A.C., additional, Deloncle, I., additional, Péru, S., additional, Zeiser, F., additional, Greenlees, P.T., additional, Kheswa, B.V., additional, Auranen, K., additional, Bleuel, D.L., additional, Cox, D.M., additional, Crespo Campo, L., additional, Giacoppo, F., additional, Görgen, A., additional, Grahn, T., additional, Guttormsen, M., additional, Hagen, T.W., additional, Harkness-Brennan, L., additional, Hauschild, K., additional, Henning, G., additional, Herzberg, R.-D., additional, Julin, R., additional, Juutinen, S., additional, Laplace, T.A., additional, Leino, M., additional, Midtbø, J.E., additional, Modamio, V., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Renstrøm, T., additional, Rezynkina, K., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Siem, S., additional, Sorri, J., additional, Stolze, S., additional, and Uusitalo, J., additional

Published
2022
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13. Experimental observation of the 1 Scissors Mode in No

Author

Bello Garrote, F.L., Lopez-Martens, A., Larsen, A.C., Deloncle, I., Péru, S., Zeiser, F., Greenlees, P.T., Kheswa, B.V., Auranen, K., Bleuel, D.L., Cox, D.M., Crespo Campo, L., Giacoppo, F., Görgen, A., Grahn, T., Guttormsen, M., Hagen, T.W., Harkness-Brennan, L., Hauschild, K., Henning, G., Herzberg, R.D., Julin, R., Juutinen, S., Laplace, T.A., Leino, M., Midtbø, J.E., Modamio, V., Pakarinen, J., Papadakis, P., Partanen, J., Renstrøm, T., Rezynkina, K., Sandzelius, M., Sarén, J., Scholey, C., Siem, S., Sorri, J., Stolze, S., and Uusitalo, J.

Abstract

We present the first experimental evidence of the scissors mode in the superheavy nucleus $^{254}$No produced in the $^{208}$Pb($^{48}$Ca, 2nγ))$^{254}$No reaction. The spectrum of γ rays emitted by the excited $^{254}$No nuclei shows an enhanced γ-ray yield for transition energies of ≈2.5 MeV. By measuring the linear polarization properties of the emitted γ rays, we confirm that the transitions in the enhancement region are predominantly of magnetic-dipole character, characteristic for the scissors mode. To further characterize the enhanced γ-ray yield, simulations of the electromagnetic decay of $^{254}$No were performed. The observed enhancement is reproduced by including an M1 component in the γ strength function with total strength B(M1↑)=11.8(19)μN2. This is in good agreement with the integrated M1 strength from sum-rule estimates and new calculations within the quasi-particle random-phase approximation presented here. Our results provide a stringent test of phenomenological formulae for the scissors mode currently used in stellar nucleosynthesis calculations. We find that those formulae are not satisfactory, and we recommend using sum-rule estimates assuming a rigid-body moment of inertia instead for describing the scissors mode in superheavy nuclei.

Published
2022

14. Transition probabilities in P and S: A test for isospin symmetry

Author

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., Penttilä, H., Recchia, F., Sahin, E., Singh, R.P., Stoyanova, M., Ur, C.A., and Wirth, H.F.

Abstract

Excited states in the mirror nuclei $^{31}$P and $^{31}$S were populated in the 1p and 1n exit channels of the reaction $^{20}$Ne + $^{12}$C, at a beam energy of 33 MeV. The $^{20}$Ne 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

15. Symmetries in mirror nuclei 31S and 31P

Author

Tonev D., de Angelis G., Goutev N., Iliev S., Orlandi R., Deloncle I., Demerdjiev A., Gadea A., Geleva E., He C., Laftchiev H., Lunardi S., Marginean N., Nikolov A., Pavlov P., Pantaleev I.L., Penttilä H., Recchia F., Sahin E., Singh R.P., Slavchev B., Wirth H.–F., and Yavahchova M.S.

Subjects
Physics, QC1-999
Abstract

Excited states in mirror nuclei 31S and 31P were populated in the 1n and 1p exit channels, respectively, of the reaction 20Ne + 12C. The beam of 20Ne, with an energy of 33 MeV, was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident pairs and Doppler-shift attenuation lifetime measurements in 31S and 31P were performed using the multidetector array GASP in conjunction with the EUCLIDES charged particle detector. A comparison of the determined B(E1) strengths of the analog mirror 7/2- → 5/2+ transitions indicates the presence of a violation of isospin symmetry.

Published
2018
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16. Transition probabilities in 31P and 31S: A test for isospin symmetry

Author

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., Penttilä, H., Recchia, F., Sahin, E., Singh, R.P., Stoyanova, M., Ur, C.A., and Wirth, H.-F.

Published
2021
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17. Reexamination of isoscalar giant resonances in C 12 and Nb 93 through Li 6 scattering

Author

Zamora, J. C., Sullivan, C., Zegers, R. G.T., Aoi, N., Batail, L., Bazin, D., Carpenter, M., Carroll, J. J., Deloncle, I., Fang, Y. D., Fujita, H., Garg, U., Gey, G., Guess, C. J., Harakeh, M. N., Hoang, T. H., Hudson, E., Ichige, N., Ideguchi, E., Inoue, A., Isaak, J., Iwamoto, C., Kacir, C., Kobayashi, N., Koike, T., Kumar Raju, M., Lipschutz, S., Liu, M., Von Neumann-Cosel, P., Noji, S., Ong, H. J., Péru, S., Pereira, J., Schmitt, J., Tamii, A., Titus, R., Werner, V., Yamamoto, Y., Zhou, X., Zhu, S., and Research unit Nuclear & Hadron Physics

Abstract

Inelastic Li6 scattering at 100 MeV/u on C12 and Nb93 has been measured with the high-resolution magnetic spectrometer Grand Raiden. The magnetic-rigidity settings of the spectrometer covered excitation energies from 10 to 40 MeV and scattering angles in the range 0°

Published
2020

18. High-spin states and lifetimes in S-33 and shell-model interpretation in the sd-fp space

Author

Aydin, S., Ionescu-Bujor, M., Gavrilov, G. Tz., Dimitrov, B. I., Lenzi, S. M., Recchia, F., Tonev, D., Bouhelal, M., Kavillioglu, F., Pavlov, P., Bazzacco, D., Bizzeti, P. G., Bizzeti-Sona, A. M., de Angelis, G., Deloncle, I., Farnea, E., Gadea, A., Gottardo, A., Goutev, N., Haas, F., Huyuk, T., Laftchiev, H., Lunardi, S., Marinov, Tz. K., Mengoni, D., Menegazzo, R., Michelagnoli, C., Napoli, D. R., Petkov, P., Sahin, E., Singh, P. P., Stefanova, E. A., Ur, C. A., Valiente-Dobon, J. J., Yavahchova, M. S., Sabire Yazıcı Fen Edebiyat Fakültesi, Gadea, Andres -- 0000-0002-4233-1970, Menegazzo, Roberto -- 0000-0002-3060-5276, Huyuk, Tayfun -- 0000-0003-0597-9767, Singh, Pushpendra P -- 0000-0003-3813-4322, Napoli, Daniel R. -- 0000-0002-8154-6958, GOTTARDO, Andrea -- 0000-0002-0390-5767, Sahin, Eda -- 0000-0003-0683-5140, and [Aydin, S. -- Kavillioglu, F.] Aksaray Univ, Dept Phys, TR-68100 Aksaray, Turkey -- [Ionescu-Bujor, M.] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania -- [Gavrilov, G. Tz. -- Dimitrov, B. I. -- Tonev, D. -- Pavlov, P. -- Goutev, N. -- Laftchiev, H. -- Marinov, Tz. K. -- Petkov, P. -- Stefanova, E. A. -- Yavahchova, M. S.] BAS, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria -- [Lenzi, S. M. -- Recchia, F. -- Bazzacco, D. -- Farnea, E. -- Gottardo, A. -- Lunardi, S. -- Mengoni, D. -- Menegazzo, R. -- Michelagnoli, C. -- Ur, C. A.] Univ Padua, Dipartimento Fis & Astron, Padua, Italy -- [Lenzi, S. M. -- Recchia, F. -- Bazzacco, D. -- Farnea, E. -- Gottardo, A. -- Lunardi, S. -- Mengoni, D. -- Menegazzo, R. -- Michelagnoli, C. -- Ur, C. A.] INFN, Sezione Padova 1, Padua, Italy -- [Bouhelal, M.] Univ Tebessa, Lab Phys Appl & Theor, Tebessa, Algeria -- [Bizzeti, P. G. -- Bizzeti-Sona, A. M.] Univ Florence, Dipartimento Fis, Florence, Italy -- [Bizzeti, P. G. -- Bizzeti-Sona, A. M.] INFN, Sezione Firenze, Florence, Italy -- [de Angelis, G. -- Gadea, A. -- Gottardo, A. -- Napoli, D. R. -- Sahin, E. -- Valiente-Dobon, J. J.] INFN, Lab Nazionali Legnaro, I-46020 Legnaro, Italy -- [Deloncle, I.] CNRS, IN2P3, IPNO, Orsay, France -- [Deloncle, I.] Univ Paris 11, Orsay, France -- [Gadea, A. -- Huyuk, T.] Univ Valencia, CSIC, Inst Fis Corpuscular, Valencia, Spain -- [Haas, F.] Univ Strasbourg, CNRS, IN2P3, IPHC, Strasbourg, France -- [Singh, P. P.] Indian Inst Technol Ropar, Dept Phys, Punjab 140001, India

Subjects
Nuclear and High Energy Physics
Abstract

WOS: 000407994600003, The structure of the S-33 nucleus was investigated in the Mg-24(N-14, alpha p) fusion-evaporation reaction using a 40-MeV N-14 beam. The level scheme was extended up to an excitation energy of 11.7 MeV and spin 19/2+. Lifetimes of the intermediate-and high-spin states have been investigated by the Doppler shift attenuation method. Data were compared with different shell-model calculations where effective interactions involving two main shells, the sd and the fp, are used., Bulgarian Science Fund [DN08/6]; program for support of young scientists, Bulgarian Academy of Sciences [DFNP 48], Authors are thankful to the XTU Tandem staff of Laboratori Nazionali di Legnaro for the good quality delivered beam. This research was supported by Bulgarian Science Fund under Contract No. DN08/6 and by the program for support of young scientists, Bulgarian Academy of Sciences under Contract No. DFNP 48.

Published
2017

19. Gamma-ray emission in alpha-particle reactions with C, Mg, Si, Fe

Author

Kiener, J., primary, Bundesmann, J., additional, Deloncle, I., additional, Denker, A., additional, Tatischeff, V., additional, Gostojic, A., additional, Hamadache, C., additional, Röhrich, J., additional, Benhabiles, H., additional, Bourgaoub, I., additional, Coc, A., additional, Hammache, F., additional, Mezhoud, R., additional, and Peyré, J., additional

Published
2020
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20. Excitations of the magic N=50 neutron-core revealed in Ga 81

Author

Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombrádi, Zs., Ducoin, C., Gadea, Andrés, Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, Silvia M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R. M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019

21. Unexpected high-energy γ emission from decaying exotic nuclei

Author

Gottardo, A., Verney, D., Deloncle, I., Péru, S., Delafosse, C., Roccia, S., Matea, I., Sotty, C., Andreoiu, C., Costache, C., Delattre, M.-C., Etilé, A., Franchoo, S., Gaulard, C., Guillot, J., Ibrahim, F., Lebois, M., MacCormick, M., Marginean, N., Marginean, R., Martini, M., Mihai, C., Mitu, I., Olivier, L., Portail, C., Qi, L., Roussière, B., Stan, L., Testov, D., Wilson, J., and Yordanov, D.T.

Published
2017
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22. Influence of octupole vibration on the low-lying structure of $^{251}\mathrm{Fm}$ and other heavy $N=151$ isotones

Author

Rezynkina, K, Lopez-Martens, A, Hauschild, K, Deloncle, I, Péru, S, Brionnet, P, Chelnokov, ML, Chepigin, VI, Dorvaux, O, Déchery, F, Faure, H, Gall, B, Isaev, AV, Izosimov, IN, Katrasev, DE, Kuznetsov, AN, Kuznetsova, AA, Malyshev, ON, Popeko, AG, Popov, YA, Sokol, EA, Svirikhin, AI, and Yeremin, AV

Abstract

© 2018 American Physical Society. The structure of low-lying excited states in Fm251, populated by the α decay of No255, has been investigated by means of combined γ and internal conversion electron spectroscopy. The values for the internal conversion coefficients for the 1/2+→5/2+ and 5/2+→9/2- transitions have been measured. The determined M2/E3 mixing ratio and lifetime for the 5/2+ decay to the ground state allowed to determine the corresponding reduced transitions strengths of B(E3)=18(6) W.u. and B(M2)=3.0(6)×10-3 W.u. These results, as well as the results of previous studies in N=151 isotopes, are compared to theoretical calculations beyond the mean-field approach, including the first QRPA calculations using the Gogny D1M parametrization for such heavy odd-N nuclei. The comparison points to the importance of accounting for the octupole vibrations for a proper understanding of the low-lying nuclear structure of some of the heaviest elements. ispartof: Physical Review C vol:97 issue:5 pages:054332-054332 status: Published online

Published
2018

23. Kr 3696 60 -Low- Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., Lemasson, A., Duchêne, G., Rejmund, M., {Clément}, E, {Michelagnoli}, C, Didierjean, F., {Korichi}, A, Maquart, G., {Stezowski}, O, Lizarazo, C., Pérez-Vidal, R. M., Andreoiu, C, {de Angelis}, G, {Astier}, A, Delafosse, C., Deloncle, I., Dombradi, Z., {de France}, G, Gadea, A, {Gottardo}, A, {Jacquot}, B, Jones, P., {Konstantinopoulos}, T, Kuti, I., Le Blanc, F., {Lenzi}, S M, Li, G., Lozeva, R, Million, B., {Napoli}, D R, Navin, A., {Petrache}, C M, Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., {Sohler}, D, Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., Collado-Vides, Julio, Cullen, D. M., Désesquelles, P., Domingo-Pardo, C, González, V., Harkness-Brennan, L., Hess, H., Judson, D. S., Karolak, M., {Korten}, W, Labiche, M, Ljungvall, J., {Menegazzo}, R, Mengoni, D., {Pullia}, A, {Recchia}, F, Reiter, P., {Salsac}, M -D, Sanchis, E., Theisen, Ch, {Valiente-Dobón}, J J, and Zielińska, M.

Subjects
Nuclear Experiment
Abstract

Prompt γ-ray spectroscopy of the neutron-rich Kr96, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to Jπ=4+, is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R4/2=E(4+)/E(2+)=2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N=60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z=36, of similar amplitude to that observed at N=60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g9/2, d5/2, and s1/2 orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R4/2 as a function of the neutron number up to N=60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N=60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N=60 and Z=36.

Published
2017

24. Kr-96(36)60-Low-Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., Lemasson, A., Duchêne, G., Rejmund, M., Clément, E., Michelagnoli, C., Didierjean, F., Korichi, A., Sanchis Peris, Enrique, González Millán, Vicente, Domingo Pardo, César, Pérez-Vidal, R. M., Collado, J., De Angelis, G., Astier, A., Delafosse, C., Deloncle, I., Dombradi, Z., de France, G., Gadea Raga, Andrés, Gottardo, A., Jacquot, B., Menegazzo, R., Konstantinopoulos, T., Valiente Dobón, J. J., Recchia, F., Lenzi, S. M., Barrientos, D., Lozeva, R., Million, B., Napoli, D. R., Navin, A., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Física nuclear, Nuclear Experiment, Espectroscòpia de ressonància magnètica nuclear
Abstract

Prompt.-ray spectroscopy of the neutron-rich Kr-96, produced in transfer-and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS + +spectrometer. A second excited state, assigned to J pi = 4(+), is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R-4/2 = E(4(+))/E(2(+)) = 2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N = 60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z = 36, of similar amplitude to that observed at N = 60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g(9/2), d(5/2), and s(1/2) orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R-4/2 as a function of the neutron number up to N = 60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N = 60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N = 60 and Z = 36.

Published
2017

25. 96Kr-Low-Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J, Lemasson, A, Duchêne, G, Rejmund, M, Clément, E, Michelagnoli, Caterina, Didierjean, F, Korichi, A, Maquart, G, Stezowski, O, Lizarazo, C, Pérez Vidal, R. M, Andreoiu, C, de Angelis, G, Astier, A, Delafosse, C, Deloncle, I, Dombradi, Z, de France, G, Gadea, A, Gottardo, Andrea, Jacquot, B, Jones, P, Konstantinopoulos, T, Kuti, I, Le Blanc, F, Lenzi, SILVIA MONICA, Li, G, Lozeva, R, Million, B, Napoli, D. R, Navin, A, Petrache, C. M, Pietralla, N, Ralet, D, Ramdhane, M, Redon, N, Schmitt, C, Sohler, D, Verney, D, Barrientos, D, Birkenbach, B, Burrows, I, Charles, L, Collado, J, Cullen, D. M, Désesquelles, P, Domingo Pardo, C, González, V, Harkness Brennan, L, Hess, H, Judson, D. S, Karolak, M, Korten, W, Labiche, M, Ljungvall, J, Menegazzo, R, Mengoni, Daniele, Pullia, A, Recchia, Francesco, Reiter, P, Salsac, M. D, Sanchis, E, Theisen, Ch, Valiente Dobón, J. J, and Zielińska, M.

Published
2017

26. Symmetries in mirror nuclei 31S and 31P.

Author

Arsenyev, N., Bezbakh, A., Rogov, I., Shneidman, T., Vdovin, A., Tonev, D., de Angelis, G., Goutev, N., Iliev, S., Orlandi, R., Deloncle, I., Demerdjiev, A., Gadea, A., Geleva, E., He, C., Laftchiev, H., Lunardi, S., Marginean, N., Nikolov, A., and Pavlov, P.

Subjects
SYMMETRY (Physics), MIRROR nuclei, EXCITED states, NUCLEAR reactions, ISOBARIC spin
Abstract

Excited states in mirror nuclei 31S and 31P were populated in the 1n and 1p exit channels, respectively, of the reaction 20Ne + 12C. The beam of 20Ne, with an energy of 33 MeV, was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident pairs and Doppler-shift attenuation lifetime measurements in 31S and 31P were performed using the multidetector array GASP in conjunction with the EUCLIDES charged particle detector. A comparison of the determined B(E1) strengths of the analog mirror 7/2- → 5/2+ transitions indicates the presence of a violation of isospin symmetry. [ABSTRACT FROM AUTHOR]

Published
2018

27. First Evidence of Shape Coexistence in the Ni-78 Region: Intruder 0(2)(+) State in Ge-80

Author

Gottardo, A., Verney, D., Delafosse, C., Ibrahim, F., Roussiere, B., Sotty, C., Roccia, S., Andreoiu, C., Costache, C., Delattre , M., Deloncle, I., Etile, A., Franchoo, S., Gaulard, C., Guillot, J., Lebois, M., MacCormick, M., Marginean, N., Marginean, R., Matea, I., Mihai, C., Mitu, I., Olivier, L., Portail, C., Qi, L., Stan, L., Testov, D., Wilson, J., Yordanov D., T., Institut de Physique Nucléaire d'Orsay (IPNO), 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), CSNSM SNO, 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), 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 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 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 Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Department of Chemistry

Subjects
[PHYS]Physics [physics], NUCLEI, 116 Chemical sciences, SHELL-MODEL DESCRIPTION, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FIRST EXCITED-STATE, 114 Physical sciences
Abstract

International audience; The N = 48 Ge-80 nucleus is studied by means of beta-delayed electron-conversion spectroscopy at ALTO. The radioactive Ga-80 beam is produced through the isotope separation on line photofission technique and collected on a movable tape for the measurement of gamma and e(-) emission following beta decay. An electric monopole E0 transition, which points to a 639(1) keV intruder 0(2)(+) state, is observed for the first time. This new state is lower than the 2(1)(+) level in Ge-80, and provides evidence of shape coexistence close to one of the most neutron-rich doubly magic nuclei discovered so far, Ni-78. This result is compared with theoretical estimates, helping to explain the role of monopole and quadrupole forces in the weakening of the N = 50 gap at Z = 32. The evolution of intruder 0(2)(+) states towards Ni-78 is discussed.

Published
2016

28. Study of the 26Al(n,p)26Mg and 26Al(n,α)23Na reactions using the 27Al(p,p')27Al inelastic scattering reaction

Author

Benamara, S., De Séréville, N., Adsley, P., Laird, A. M., Hammache, F., Stefan, I., Roussel, P., Ancelin, S., Assié, M., Barton, C., Coc, A., Diget, C., Deloncle, I., Fox, S., Guillot, J., Hamadache, C., Kiener, J., Le Crom, B., Lefebvre, L., Lefebfre-Schuhl, A., Marquinez Duran, G., Mavilla, G., Morfouace, P., Mutschler, A., Nsangu, C. T., Perrot, L., Oulebsir, N., Sánchez-Benítez, M., Suzuki, D., Tatischeff, V., and Vandebrouck, M.

Abstract

26Al was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26Al(n,p)26Mg and 26 Al(n,α)23Na reactions. We report on a single and coincidence measurement of the 27Al(p,p')27Al(p)26Mg and 27Al(p,p')27Al(α)23Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27Al above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26Al+n threshold.

Published
2016

30. Study of the26Al(n,p)26Mg and26Al(n,α)23Na reactions using the27Al(p,p')27Al inelastic scattering reaction

Author

Benamara, S, primary, de Séréville, N, additional, Adsley, P, additional, Laird, A M, additional, Hammache, F, additional, Stefan, I, additional, Roussel, P, additional, Ancelin, S, additional, Assié, M, additional, Barton, C, additional, Coc, A, additional, Diget, C, additional, Deloncle, I, additional, Fox, S, additional, Guillot, J, additional, Hamadache, C, additional, Kiener, J, additional, Le Crom, B, additional, Lefebvre, L, additional, Lefebfre-Schuhl, A, additional, Marquinez Duran, G, additional, Mavilla, G, additional, Morfouace, P, additional, Mutschler, A, additional, Nsangu, C T, additional, Perrot, L, additional, Oulebsir, N, additional, Sánchez-Benítez, Á-M, additional, Suzuki, D, additional, Tatischeff, V, additional, and Vandebrouck, M, additional

Published
2016
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31. Lifetime measurements and the high-spin structure of 36Cl

Author

Aydin, S, primary, Ionescu-Bujor, M, additional, Recchia, F, additional, Gadea, A, additional, Lenzi, S M, additional, Lunardi, S, additional, Ur, C A, additional, Bazzacco, D, additional, Bizzeti, P G, additional, Bizzeti-Sona, A M, additional, Bouhelal, M, additional, de Angelis, G, additional, Deloncle, I, additional, Farnea, E, additional, Gottardo, A, additional, Haas, F, additional, Huyuk, T, additional, Laftchiev, H, additional, Mengoni, D, additional, Menegazzo, R, additional, Michelagnoli, C, additional, Napoli, D R, additional, Sahin, D, additional, Singh, P P, additional, Tonev, D, additional, and Valiente-Dobón, J J, additional

Published
2015
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33. Level-scheme investigation of33S

Author

Gavrilov, G Tz, primary, Goutev, N, additional, Dimitrov, B I, additional, Tonev, D, additional, Petkov, P, additional, Angelis, G de, additional, Recchia, F, additional, Farnea, E, additional, Ur, C A, additional, Aydin, S, additional, Bizzeti, P G, additional, Bizzeti-Sona, A M, additional, Deloncle, I, additional, Gottardo, A, additional, Laftchiev, H, additional, Lunardi, S, additional, Mengoni, D, additional, Michelangoli, C, additional, Napoli, D R, additional, Orlandi, R, additional, Sahin, E, additional, Stefanova, E A, additional, Valente-Dobon, J J, additional, Marinov, Tz K, additional, and Yavahchova, M S, additional

Published
2014
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34. Electromagnetic transition strengths in33S

Author

Dimitrov, B I, primary, Goutev, N, additional, Gavrilov, G Tz, additional, Tonev, D, additional, Petkov, P, additional, de Angelis, G, additional, Recchia, F, additional, Farnea, E, additional, Ur, C A, additional, Aydin, S, additional, Bizzeti, P G, additional, Bizzeti-Sona, A M, additional, Deloncle, I, additional, Gottardo, A, additional, Laftchiev, H, additional, Lunardi, S, additional, Mengoni, D, additional, Michelangoli, C, additional, Napoli, D R, additional, Orlandi, R, additional, Sahin, E, additional, Stefanova, E A, additional, Valente-Dobon, J J, additional, Marinov, Tz K, additional, and Yavahchova, M S, additional

Published
2014
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36. Lifetime measurements and the high-spin structure of 36Cl

Author

J. J. Valiente-Dobón, D. R. Napoli, D. Mengoni, P. G. Bizzeti, D. Bazzacco, D Sahin, C. A. Ur, F. Recchia, E. Farnea, H. Laftchiev, G. de Angelis, M. Bouhelal, A. M. Bizzeti-Sona, F. Haas, S. Aydin, Pushpendra Singh, Dimitar Tonev, C. Michelagnoli, I. Deloncle, S. Lunardi, A. Gadea, T. Hüyük, R. Menegazzo, M. Ionescu-Bujor, S. M. Lenzi, A. Gottardo, [Aydin, S.] Aksaray Univ, Dept Phys, TR-68100 Aksaray, Turkey -- [Aydin, S. -- Recchia, F. -- Lenzi, S. M. -- Lunardi, S. -- Ur, C. A. -- Bazzacco, D. -- Farnea, E. -- Gottardo, A. -- Mengoni, D. -- Menegazzo, R. -- Michelagnoli, C.] Univ Padua, Dipartimento Fis & Astron, Padua, Italy -- [Aydin, S. -- Recchia, F. -- Lenzi, S. M. -- Lunardi, S. -- Ur, C. A. -- Bazzacco, D. -- Farnea, E. -- Gottardo, A. -- Mengoni, D. -- Menegazzo, R. -- Michelagnoli, C.] Ist Nazl Fis Nucl, Padua, Italy -- [Ionescu-Bujor, M.] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest 077125, Romania -- [Gadea, A. -- de Angelis, G. -- Gottardo, A. -- Napoli, D. R. -- Sahin, E. -- Singh, P. P. -- Valiente-Dobon, J. J.] INFN Lab Nazl Legnaro, I-46020 Legnaro, Italy -- [Gadea, A. -- Huyuk, T.] CSIC Univ Valencia, Inst Fis Corpuscular, Valencia, Spain -- [Bizzeti, P. G. -- Bizzeti-Sona, A. M.] Univ Florence, Dipartimento Fis, Florence, Italy -- [Bizzeti, P. G. -- Bizzeti-Sona, A. M.] INFN Sez Firenze, Florence, Italy -- [Bouhelal, M.] Univ Tebessa, Lab Phys Appl & Theor, Tebessa, Algeria -- [Deloncle, I.] IN2P3 CNRS, IPNO, Orsay, France -- [Deloncle, I.] Univ Paris 11, Orsay, France -- [Haas, F.] Univ Strasbourg, CNRS IN2P3, IPHC, Strasbourg, France -- [Laftchiev, H. -- Tonev, D.] BAS, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria -- [Mengoni, D.] Univ West Scotland, Paisley, Renfrew, Scotland, Napoli, Daniel Ricardo -- 0000-0002-8154-6958, Singh, Pushpendra P -- 0000-0003-3813-4322, Huyuk, Tayfun -- 0000-0003-0597-9767, Menegazzo, Roberto -- 0000-0002-3060-5276, Gadea, Andres -- 0000-0002-4233-1970, Tonev, Dimitar -- 0000-0003-4431-6157, Recchia, Francesco -- 0000-0002-8428-0112, GOTTARDO, Andrea -- 0000-0002-0390-5767, and Fen-Edebiyat Fakültesi

Subjects
History, symbols.namesake, Chemistry, Attenuation, SHELL model, symbols, Parity (physics), Atomic physics, Spin structure, Doppler effect, Computer Science Applications, Education
Abstract

1st NUBA International Conference on Nuclear Physics and Astrophysics -- SEP 14-21, 2014 -- Akdeniz Univ, Antalya, TURKEY, WOS: 000354773900036, High-spin states in Cl-36 were populated through the Mg-24(N-14,2p)Cl-36 reaction at E(N-14)=31 MeV. Lifetimes have been determined for fifteen states by applying the Doppler shift attenuation method. The results indicated the onset of collectivity in the high spin negative parity states. Large basis shell model calculations have been performed to understand the underlying structure of these states.

Published
2015

37. 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

38. High-spin spectroscopy of Ce139

Author

T. Konstantinopoulos, I. Deloncle, A. Gargano, B. Melon, C. M. Petrache, D. Guinet, A. Nannini, S. Kaim, T. Zerrouki, T. Bhattacharjee, C. Ducoin, R. Leguillon, D. Wilmsen, A. Astier, Nunzio Itaco, J.-M. Régis, Centre de Sciences Nucléaires et de Sciences de la Matière (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 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), Kaim, S., Petrache, C. M., Gargano, A., Itaco, Nunzio, Zerrouki, T., Leguillon, R., Astier, A., Deloncle, I., Konstantinopoulos, T., Regis, J. M., Wilmsen, D., Melon, B., Nannini, A., Ducoin, C., Guinet, D., Bhattacharjee, T., S., Kaim, C. M., Petrache, A., Gargano, T., Zerrouki, R., Leguillon, A., Astier, I., Deloncle, T., Konstantinopoulo, J. M., Régi, D., Wilmsen, B., Melon, A., Nannini, C., Ducoin, D., Guinet, and T., Bhattacharjee

Subjects
Physics, Nuclear and High Energy Physics, Spins, 010308 nuclear & particles physics, Magnetic rotation, Halo nucleus, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Dipole, 0103 physical sciences, Level structure, Atomic physics, 010306 general physics, Spectroscopy
Abstract

High-spin states in $^{139}\mathrm{Ce}$ have been populated using the $^{130}\mathrm{Te}(^{14}\mathrm{C},5n)$ reaction. The level scheme has been extended to higher spins, including a new band of dipole transitions. The parity of several states has been changed from negative to positive, mainly based on the comparison with the level structure of the core nucleus $^{140}\mathrm{Ce}$ and the results of a realistic shell-model calculation. The dipole band is interpreted as a magnetic rotation band with $\ensuremath{\pi}{h}_{11/2}^{2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}^{\ensuremath{-}1}$ configuration built on small deformation axial shape with $({\ensuremath{\varepsilon}}_{2}=0.12,\ensuremath{\gamma}={0}^{\ensuremath{\circ}})$.

Published
2015

39. Electromagnetic transition strengths in33S

Author

D. Mengoni, E. A. Stefanova, A. M. Bizzeti-Sona, P. G. Bizzeti, G. Tz. Gavrilov, I. Deloncle, Dimitar Tonev, A. Gottardo, B. I. Dimitrov, C. A. Ur, M. S. Yavahchova, F. Recchia, H. Laftchiev, S. Aydin, G. de Angelis, Tz K Marinov, R. Orlandi, N. Goutev, D. R. Napoli, E. Farnea, J J Valente-Dobon, S. Lunardi, P. Petkov, C Michelangoli, E. Sahin, [Dimitrov, B. I. -- Goutev, N. -- Gavrilov, G. Tz. -- Tonev, D. -- Petkov, P. -- Laftchiev, H. -- Stefanova, E. A. -- Marinov, Tz. K. -- Yavahchova, M. S.] BAS, Inst Nucl Res & Nucl Energy, BG-1784 Sofia, Bulgaria -- [de Angelis, G. -- Recchia, F. -- Aydin, S. -- Gottardo, A. -- Mengoni, D. -- Michelangoli, C. -- Napoli, D. R. -- Orlandi, R. -- Sahin, E. -- Valente-Dobon, J. J.] INFN, Lab Nazl Legnaro, I-35020 Legnaro, Italy -- [Farnea, E. -- Ur, C. A. -- Lunardi, S.] INFN, Dipartimento Fis, Padua, Italy -- [Aydin, S.] Aksaray Univ, Dept Phys, TR-68100 Aksaray, Turkey -- [Bizzeti, P. G. -- Bizzeti-Sona, A. M.] INFN, Dipartimento Fis Universita, Florence, Italy -- [Deloncle, I.] Univ Paris 11, CSNSM, IN2P3 CNRS, Orsay, France, Tonev, Dimitar -- 0000-0003-4431-6157, Napoli, Daniel Ricardo -- 0000-0002-8154-6958, GOTTARDO, Andrea -- 0000-0002-0390-5767, Sahin, Eda -- 0000-0003-0683-5140, Recchia, Francesco -- 0000-0002-8428-0112, and Sabire Yazıcı Fen Edebiyat Fakültesi

Subjects
Nuclear reaction, History, Mathematical model, Chemistry, Attenuation, Computer Science Applications, Education, symbols.namesake, Nuclear magnetic resonance, Excited state, symbols, Alpha decay, Atomic physics, Isotopes of magnesium, Doppler effect, Radioactive decay
Abstract

20th International School on Nuclear Physics, Neutron Physics and Applications -- SEP 16-22, 2013 -- Varna, BULGARIA, WOS: 000346180900049, An experiment using the Doppler Shift Attenuation Method was performed for S-33 at Laboratori Nazionali di Legnaro using the multi-detector array GASP. Excited states were populated in the fusion-evaporation reaction Mg-24(N-14, alpha p)(33) S. The data were analyzed using the Differential Decay Curve Method with gates set on the shifted component of a directly feeding transition thus eliminating the problem of the unobserved feeding. Reliable and precise lifetimes were determined and the data derived for the reduced transition probabilities are going to be compared to the predictions of shell model calculations., Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Bulgarian Nucl Regulatory Agcy, Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Bulgarian Minist Educ Youth & Sci, Bulgarian Science Fund [DFNI-E 01/2]; Bulgarian Ministry of Education and Science., This research has been supported by Bulgarian Science Fund under contract DFNI-E 01/2 and by a NUPNET - NEDENSAA project funded by the Bulgarian Ministry of Education and Science.

Published
2014

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