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1. Transition probabilities in 31P and 31S: A test for isospin symmetry

Author

D. Tonev, G. de Angelis, I. Deloncle, N. Goutev, G. De Gregorio, P. Pavlov, I.L. Pantaleev, S. Iliev, M.S. Yavahchova, P.G. Bizzeti, A. Demerdjiev, D.T. Dimitrov, E. Farnea, A. Gadea, E. Geleva, C.Y. He, H. Laftchiev, S.M. Lenzi, S. Lunardi, N. Marginean, R. Menegazzo, D.R. Napoli, F. Nowacki, R. Orlandi, H. Penttilä, F. Recchia, E. Sahin, R.P. Singh, M. Stoyanova, C.A. Ur, and H.-F. Wirth

Subjects
Mirror nuclei, Lifetime measurements, Transition probabilities, Isospin symmetry, Microscopic multiphonon model, Physics, QC1-999
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 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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2. 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

3. Symmetries in mirror nuclei $^{31}$S and $^{31}$P

Author

E. Geleva, R. Orlandi, B. Slavchev, P. Pavlov, S. Iliev, Dimitar Tonev, I. Deloncle, A. Demerdjiev, F. Recchia, E. Sahin, Heikki Penttilä, I.L. Pantaleev, N. Goutev, A. Nikolov, H. Laftchiev, G. de Angelis, S. Lunardi, H.-F. Wirth, N. Marginean, A. Gadea, M. S. Yavahchova, He Chunhong Chelsie, R. P. Singh, 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), Arsenyev, N., Bezbakh, A., Rogov, I., Shneidman, T., and Vdovin, A.

Subjects
Physics, ta114, 010308 nuclear & particles physics, Attenuation, QC1-999, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Nuclear physics, Physics and Astronomy (all), Coincident, nuclear physics, Isospin, Excited state, 0103 physical sciences, Mirror nuclei, 010306 general physics, ydinfysiikka, Beam (structure)
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

4. High-spin states and lifetimes in S33 and shell-model interpretation in the sd−fp space

Author

N. Goutev, S. Lunardi, Tz K Marinov, D. Mengoni, R. Menegazzo, P. Petkov, E. Farnea, Pushpendra Singh, F. Kavillioglu, E. A. Stefanova, I. Deloncle, M. Ionescu-Bujor, T. Hüyük, D. Bazzacco, S. M. Lenzi, A. Gottardo, F. Haas, A. M. Bizzeti-Sona, M. S. Yavahchova, G. Tz. Gavrilov, P. G. Bizzeti, P. Pavlov, Dimitar Tonev, C. Michelagnoli, E. Sahin, H. Laftchiev, F. Recchia, G. de Angelis, J. J. Valiente-Dobón, D. R. Napoli, M. Bouhelal, B. I. Dimitrov, C. A. Ur, Sibel Zehra Aydin, and A. Gadea

Subjects
Physics, Spin states, 010308 nuclear & particles physics, Attenuation, Nuclear Theory, Space (mathematics), 7. Clean energy, 01 natural sciences, symbols.namesake, medicine.anatomical_structure, 0103 physical sciences, medicine, symbols, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Doppler effect, Beam (structure), Excitation, Spin-½
Abstract

The structure of the S33 nucleus was investigated in the Mg24(N14,αp) fusion-evaporation reaction using a 40-MeV N14 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.

Published
2017

5. 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

6. Pairing correlations in high spin states

Author

H. Laftchiev, D. Samsoen, P. Quentin, I.N. Mikhailov, 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), and Robert, Suzanne

Subjects
Physics, Nuclear and High Energy Physics, Spin states, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Routhian, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Quantum electrodynamics, Pairing, Quantum mechanics, 0103 physical sciences, 010306 general physics
Abstract

The topics covered by this talk could be boldly summarized in another way by asking the question: to describe accurately intrinsic vortical currents due to pairing correlations, do we need Routhian Hartree-Fock-Bogoliubov calculations?

Published
2004

7. High-spin level structure of35S

Author

F. Recchia, M. Bouhelal, C. Michelagnoli, T. Hüyük, D. Bazzacco, Pushpendra Singh, A. Gottardo, I. Deloncle, Sibel Zehra Aydin, E. Farnea, M. Ionescu-Bujor, A. M. Bizzeti-Sona, P. G. Bizzeti, A. Poves, E. Sahin, D. Mengoni, F. Haas, D. R. Napoli, R. Menegazzo, Dimitar Tonev, H. Laftchiev, G. de Angelis, S. M. Lenzi, J. J. Valiente-Dobón, S. Lunardi, C. A. Ur, A. Gadea, 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), 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), and Sabire Yazıcı Fen Edebiyat Fakültesi

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Attenuation, SHELL model, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, symbols.namesake, Excited state, 0103 physical sciences, symbols, Level structure, Atomic physics, 010306 general physics, Spin (physics), Spectroscopy, Doppler effect
Abstract

The nucleus 35S has been studied by in-beam ?-ray spectroscopy using the 24Mg(14N,3p) fusion-evaporation reaction at Elab=40 MeV. A level scheme extended up to J?=17/2+ at 8023 keV and J?=13/2- at 6352 keV has been established. Lifetimes of six excited states have been determined by applying the Doppler shift attenuation method. The experimental data have been compared with the results of large-scale shell model calculations performed using different effective interactions and model spaces allowing particle-hole excitations across the N=Z=20 shell gap. © 2014 American Physical Society.

Published
2014

8. Level-scheme investigation of 33S

Author

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

Subjects
Nuclear reaction, Physics, History, Angular momentum, Nuclear structure, Electromagnetic radiation, Computer Science Applications, Education, Physics and Astronomy (all), Angular correlation, Detector array, Atomic physics, Spin (physics), Beam energy
Abstract

An angular correlation experiment was carried out for 33 S at Laboratori Nazionali di Legnaro with the gamma-ray detector array GASP. The reaction used was 24Mg(14N,α p)33S at a beam energy of 40MeV. An analysis of DCO ratios and triple gamma coincidences was performed. So far, a new level depopulated by 3 γ -ray transitions has been found and its spin was determined. The work for further extension of the level scheme is in progress.

Published
2014

9. High-spin structure and intruder excitations in ^{36}Cl

Author

D. Bazzacco, P. G. Bizzeti, S. Lunardi, F. Haas, Sibel Zehra Aydin, R. Menegazzo, D. R. Napoli, D. Mengoni, F. Recchia, A. Gottardo, M. Ionescu-Bujor, M. Bouhelal, E. Sahin, H. Laftchiev, G. de Angelis, C. Michelagnoli, T. Hüyük, Pushpendra Singh, I. Deloncle, A. M. Bizzeti-Sona, Dimitar Tonev, E. Farnea, J. J. Valiente-Dobón, C. A. Ur, A. Gadea, S. M. Lenzi, Sabire Yazıcı Fen Edebiyat Fakültesi, Gadea, Andres -- 0000-0002-4233-1970, Huyuk, Tayfun -- 0000-0003-0597-9767, Singh, Pushpendra P -- 0000-0003-3813-4322, Tonev, Dimitar -- 0000-0003-4431-6157, Menegazzo, Roberto -- 0000-0002-3060-5276, 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, CSNSM SNO, 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)-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), 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 Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Attenuation, SHELL model, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Spin structure, 01 natural sciences, symbols.namesake, medicine.anatomical_structure, Excited state, 0103 physical sciences, symbols, medicine, Atomic physics, 010306 general physics, Doppler effect, Nucleus
Abstract

WOS: 000308129400006, Excited states up to J(pi) = 11(-) at 10 296 keV and J(pi) = 10(+) at 10 707 keV have been populated in the odd-odd Cl-36 nucleus using the Mg-24(N-14,2p) fusion-evaporation reaction at E-lab = 31 MeV. Twenty new states and 62 new gamma transitions have been identified by employing gamma-gamma and gamma-gamma-gamma coincidences. Lifetimes have been investigated by the Doppler shift attenuation method. The experimental data have been compared with the results of large-scale shell-model calculations performed using different effective interactions and model spaces allowing particle-hole excitations across the N = Z = 20 shell gap., MICINN, Spain; INFN, Italy [ACI2009-1070]; Spanish MINECO [AIC-D-2011-0746, AIC10-D-000568, FPA2011-29854]; Generalitat Valenciana [PROMETEO/2010/101], This work was carried out at the INFN Laboratori Nazionali di Legnaro (LNL), Italy. Authors are thankful to the XTU Tandem staff of LNL for delivering good-quality beam. S. Aydin thanks Sudeb Bhattacharya for very useful discussions during the preparation of the manuscript. A. Gadea and E. Farnea acknowledge the support of MICINN, Spain, and INFN, Italy, through the ACI2009-1070 bilateral action. A. Gadea activity has been partially supported by the Spanish MINECO under Grants No. AIC-D-2011-0746, No. AIC10-D-000568, and No. FPA2011-29854 and the Generalitat Valenciana under Grant No. PROMETEO/2010/101.

Published
2012

10. Equivalence of pairing correlations and intrinsic vortical currents in rotating nuclei

Author

D. Samsœn, P. Quentin, H. Laftchiev, I. N. Mikhailov, Chambon, Pascale, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and 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)

Subjects
Physics, Coupling, Nuclear and High Energy Physics, Current (mathematics), Nuclear Theory, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], FOS: Physical sciences, Expectation value, Moment of inertia, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Rotation formalisms in three dimensions, Nuclear Theory (nucl-th), Classical mechanics, Pairing, Quantum mechanics, 0103 physical sciences, 010306 general physics, Chandrasekhar limit, Spin-½
Abstract

The present paper establishes a link between pairing correlations in rotating nuclei and collective vortical modes in the intrinsic frame. We show that the latter can be embodied by a simple S-type coupling a la Chandrasekhar between rotational and intrinsic vortical collective modes. This results from a comparison between the solutions of microscopic calculations within the HFB and the HF Routhian formalisms. The HF Routhian solutions are constrained to have the same Kelvin circulation expectation value as the HFB ones. It is shown in several mass regions, pairing regimes, and for various spin values that this procedure yields moments of inertia, angular velocities, and current distributions which are very similar within both formalisms. We finally present perspectives for further studies., 8 pages, 4 figures, submitted to Phys. Rev. C

Published
2003

11. 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

12. Lifetime measurements in mirror nuclei31S and31P: A test for isospin mixing

Author

He Chunhong Chelsie, A. Iordachescu, C. A. Ur, P. Petkov, P. G. Bizzeti, D. Mengoni, R. P. Singh, M. Ionescu-Bujor, G. Lo Bianco, A. M. Bizzeti-Sona, R. Menegazzo, S. Lunardi, H.-F. Wirth, N. Marginean, Heikki Penttilä, D. Bucurescu, A. Gadea, D. Bazzacco, J. J. Valiente-Dobón, Q. Zhong, R. Orlandi, Slobodan Brant, S. Iliev, Dimitar Tonev, I. Deloncle, A. Saltarelli, H. Laftchiev, G. de Angelis, F. Della Vedova, N. Goutev, E. Sahin, D. R. Napoli, M. S. Yavahchova, R. Mărginean, E. Farnea, F. Recchia, and S. M. Lenzi

Subjects
Physics, History, Carbon-12, Symmetry (physics), Charged particle, Computer Science Applications, Education, Nuclear physics, Isotopes of neon, Coincident, Isospin, Phosphorus-31 NMR spectroscopy, Mirror nuclei, Atomic physics
Abstract

Using the 20Ne + 12C fusion-evaporation reaction at E20Ne = 33 MeV and the multidetector array GASP in conjuction with the EUCLIDES charged particle detector, angular correlations of coincident pairs of γ transitions and lifetimes in mirror nuclei 31S and 31P have been measured at the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. 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
2011

13. Higher Tamm-Dankoff approximation for rotational nuclear states

Author

H. Laftchiev, J. Libert, P Quentin, and Ha Thuy Long

Subjects
Physics, History, Spins, 010308 nuclear & particles physics, SHELL model, 7. Clean energy, 01 natural sciences, Computer Science Applications, Education, Mean field theory, Atomic orbital, T-symmetry, 0103 physical sciences, Configuration space, Atomic physics, 010306 general physics, Ground state, Physical quantity
Abstract

Within the Higher Tamm Dancoff Approximation (HTDA), single particle states associated with a mean field of the Hartree-Fock type are used into shell model like calculations. Recently, this approach has been used for ground state calculations in magic nuclei and in the N = Z mass region, as well as to study properties of some important isomeric states. The Cranking version of this formalism (Cr. HTDA) represents an attempt to reproduce rotational bands up to high spins in heavy nuclei. In this context, through the use of the mean field part of HTDA, many deformation and rotation effects (as intruder orbitals and effects of the time reversal symmetry breaking) are included in the configuration space. This work discusses the Cr. HTDA results obtained for two Pb isotopes (in order to test the approach), when using up to 2 particles – 2 holes excitations and provides tests for enlargement of the configuration space by 4 particle – 4 holes excitations. It is focused on the configuration space properties, improvement of truncation schemes, computational problems and saturation behavior of some physical quantities.

Published
2010

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