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1. 4D-imaging of drip-line radioactivity by detecting proton emission from Ni-54m pictured with ACTAR TPC

Author

M. Versteegen, J. Giovinazzo, Dirk Rudolph, O. Sorlin, P. Ascher, T. Roger, A. Arokia Raj, B. Fernández-Domínguez, J. Piot, Daniel Cox, M. Caamaño-Fresco, H. Alvarez-Pol, O. Kamalou, J. C. Thomas, B. Mauss, J. Pancin, M. Gerbaux, L. Cáceres, C. Stodel, J. Lois-Fuentes, J. Pibernat, B. Blank, S. Grévy, A. Mentana, B. A. Brown, G. F. Grinyer, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), and 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)

Subjects
Proton, Physics::Instrumentation and Detectors, Science, Nuclear Theory, ACTIVE TARGET, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Techniques and instrumentation, Nuclear physics, Quantum state, 0103 physical sciences, Quantum system, Experimental nuclear physics, Proton emission, 010306 general physics, Wave function, Nuclear Experiment, Quantum tunnelling, Physics, Multidisciplinary, Science & Technology, 010308 nuclear & particles physics, Nuclear shell model, General Chemistry, NUCLEAR-PHYSICS, Multidisciplinary Sciences, Theoretical nuclear physics, Atomic nucleus, SHELL-MODEL, Physics::Accelerator Physics, Science & Technology - Other Topics, SYSTEM
Abstract

Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions., Proton radioactivity is useful for studying nuclear structure. Here the authors report two proton emission branches from the 10+ state isomer of 54mNi by using a time projection chamber.

Published
2021
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2. Detailed study of the decay of 32Ar

Author

M. J. G. Borge, F. de Oliveira Santos, B. Blank, A. Bey, N. Adimi, J. C. Thomas, K. Suemmerer, J. Giovinazzo, Ángel Perea, H. H. Knudsen, Carole Dossat, I. Matea, H. O. U. Fynbo, Olof Tengblad, M. Alcorta, M. Madurga, B. A. Brown, A. Magilligan, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), 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), 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), Région Nouvelle-Aquitaine, Consorcio de Universidades Mexicanas, and National Science Foundation (US)

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Silicon, 010308 nuclear & particles physics, Detector, Nuclear Theory, Gamma ray, chemistry.chemical_element, FOS: Physical sciences, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, chemistry, 0103 physical sciences, High Energy Physics::Experiment, Cube, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Fermi Gamma-ray Space Telescope
Abstract

16 pags., 9 figs., 7 tabs., In an experiment performed at the SPIRAL1 facility of GANIL, the β decay of Ar has been studied by means of the “Silicon Cube” device associated with germanium clover detectors from the EXOGAM array. Beta-delayed protons and γ rays have been observed and allowed the determination of all relevant decay branches. The Gamow–Teller strength distribution is compared to shell-model calculations and excellent agreement is found. The Fermi strength is inline with expectations. A quasi-complete decay scheme of Ar is established., This work was partly funded by the Conseil régional de la Nouvelle Aquitaine and the EU through the Human Capital and Mobility program. We acknowledge support from CICYT via contract FPA2007-62179. BAB is supported by NSF via Grant PHY1811855.

Published
2021
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3. Studying the Exotic Decay $^{70}Kr$ $\rightarrow$ $^{70}Br$

Author

Daiki Nishimura, G. de Angelis, Hiroyoshi Sakurai, Y. Shimizu, P. A. Söderström, Shunji Nishimura, S. Yagi, C. Magron, J. Agramunt, V. Guadilla, JJ Liu, H. Oikawa, S. M. Lenzi, Y. Takei, N. Kurz, W. Gelletly, S. Chen, A. I. Morales, F. Recchia, E. Ganioglu, J. Giovinazzo, H. Baba, Y. Fujita, V. H. Phong, Gabor Kiss, F. Diel, T. Goigoux, H. Suzuki, D. S. Ahn, Zs. Dombradi, T. Kurtukian Nieto, Jin Wu, P. Aguilera, J. Eberth, N. Fukuda, Jenny Lee, B. Rubio, F. Molina, T. Isobe, P. J. Davies, I. Kojouharov, P. Ascher, M. Tanaka, Alejandro Algora, Naohito Inabe, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, P. Doornebal, A. Montaner-Pizá, D. Lubos, C. Borcea, D. R. Napoli, M. Gerbaux, H. Shaffner, S. Grévy, W. Korten, A. Horvath, Toshiyuki Kubo, A. Boso, Shigeru Kubono, A. Vitez-Sveiczer, T. Lokotko, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), 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 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Nuclear physics, Physics, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences
Abstract

Acta physica Polonica / B 51(3), 587 (2020). doi:10.5506/APhysPolB.51.587, Published by Inst. of Physics, Jagellonian Univ., Cracow

Published
2020
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4. Branching ratio of the super-allowed $\beta$ decay of $^{10}$C

Author

J. Giovinazzo, B. Blank, P. Ascher, M. R. Dunlop, A. T. Laffoley, M. Gerbaux, S. Grévy, T. Kurtukian Nieto, R. Dunlop, P. Finlay, M. Aouadi, G. F. Grinyer, 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Order (ring theory), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Beta decay, Semiconductor detector, Nuclear physics, 0103 physical sciences, Nuclear fusion, Physics::Accelerator Physics, Beta (velocity), Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

In an experiment performed at the ISOLDE facility of CERN, the super-allowed $\beta $-decay branching ratio of $^{10}$C was determined with a high-precision single-crystal germanium detector. In order to evaluate the contribution of the pile-up of two 511 keV $\gamma $ quanta to one of the $\gamma $-ray peaks of interest at 1021.7 keV, data were not only taken with $^{10}$C, but also with a $^{19}$Ne beam. The final result for the super-allowed decay branch is 1.4638(50)%, in agreement with the average from literature. In an experiment performed at the ISOLDE facility of CERN, the super-allowed beta-decay branching ratio of 10C was determined with a high-precision single-crystal germanium detector. In order to evaluate the contribution of the pile-up of two 511 keV gamma quanta to one of the gamma-ray peaks of interest at 1021.7 keV, data were not only taken with 10C, but also with a 19Ne beam. The final result for the super-allowed decay branch is 1.4638(50)%, in agreement with the average from literature.

Published
2020
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5. Demonstrator Detection System for the Active Target and Time Projection Chamber (ACTAR TPC) project

Author

B. Osmond, B. Blank, G. Minier, J. Giovinazzo, A.T. Laffoley, T. Goigoux, Tommaso Marchi, H. Alvarez-Pol, P. Konczykowski, J.A. Swartz, Jiecheng Yang, C. Maugeais, J. L. Pedroza, M. Caamaño, P. Sénécal, D. Suzuki, G. Lebertre, F. Saillant, O. Poleshchuk, L. Legeard, B. Raine, Francesca Renzi, G. F. Grinyer, S. Ceruti, P. Rosier, B. Mauss, F. Flavigny, T. Roger, N. Lecesne, E. C. Pollacco, B. Fernández-Domínguez, J. Pancin, Riccardo Raabe, Mathieu Babo, C. Wouters, J. L. Henares, J. Pibernat, J. Daemen, B. Duclos, P. Sizun, G. Wittwer, S. Damoy, 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), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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), and 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)

Subjects
micromegas, Physics, Nuclear and High Energy Physics, Range (particle radiation), Time projection chamber, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Plane (geometry), Amplifier, Detector, Nuclear physics, MicroMegas detector, 01 natural sciences, Square (algebra), Optics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Active target, 010306 general physics, business, Instrumentation, Realization (systems)
Abstract

The design, realization and operation of a prototype or “demonstrator” version of an active target and time projection chamber (ACTAR TPC) for experiments in nuclear physics is presented in detail. The heart of the detection system features a micromegas gas amplifier coupled to a high-density pixelated pad plane with square pad sizes of 2 × 2 mm 2 . The detector has been thoroughly tested with several different gas mixtures over a wide range of pressures and using a variety of sources of ionizing radiation including laser light, an α -particle source and heavy-ion beams of 24Mg and 58Ni accelerated to energies of 4.0 MeV/u. Results from these tests and characterization of the detector response over a wide range of operating conditions will be described. These developments have served as the basis for the design of a larger detection system that is presently under construction.

Published
2018
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6. New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

Author

Toshiyuki Sumikama, J. Giovinazzo, Hiroyuki Takeda, Hiroyoshi Sakurai, D. Kameda, Hidetada Baba, T. Faestermann, Stephen Rice, Y. Shimizu, Shunji Nishimura, T. Isobe, I. Kojouharov, S. Ilieva, P. Doornenbal, L. Sinclair, Young-Ki Kim, F. Browne, Y. F. Fang, Giuseppe Lorusso, Younghun Kwon, Hiroshi Watanabe, Igor T. Čeliković, Z. Wang, N. Goel, P. Boutachkov, Jinguang Wu, Joochun Park, K. Steiger, Bertram Blank, D. Lubos, Z. Patel, Naohito Inabe, A. Jungclaus, I. Nishizuka, Zhengyu Xu, Toshiyuki Kubo, Roman Gernhäuser, Mustafa Rajabali, Hiroshi Suzuki, A. Blazhev, P. A. Söderström, D. S. Ahn, G. D. Kim, Daichi Murai, M. Lewitowicz, R. Krücken, H. Schaffner, K. Moschner, H. Grawe, N. Kurz, M. Górska, and Naoki Fukuda

Subjects
Physics, Spins, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Proton emission, Nuclear Experiment, 010306 general physics, Spectroscopy, Excitation
Abstract

A decay spectroscopy experiment on proton-rich nuclei in the vicinity of the doubly magic Sn100 was carried out at RIKEN Nishina Center. More than 20 nuclei with 43≤Z≤50 and N≤51, produced by fragmentation reactions were investigated via analyses of β-decay, βp-decay, and subsequent γ-ray data. Owing to higher statistics, the precision on the half-lives of many of the ground states and isomers was improved. β-decay endpoint energies of 11 states in 8 nuclei were measured for the first time, and the corresponding QEC and excitation energies were generally consistent with various mass models. Many β-delayed proton emission branching ratios were measured either for the first time or with higher precision compared to literature values, and some of them differed by more than 2σ. Many of the large discrepancies were associated with nuclei with long-lived isomeric states, highlighting large systematic uncertainties involved in these measurements. Twenty-five new γ rays were observed, and ten new states are proposed with unambiguous excitation energies, spins, and parities. Most of the energies of the excited states were consistent within 300 keV or 20%, whichever was greater, compared to shell model predictions in the proton/neutron (p1/2,g9/2) model space assuming a Sr76 core. A signature of a new (1/2-) isomer in Cd97 with T1/2=0.73(7) s was found, in good agreement with shell model predictions.

Published
2019
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7. Scalar current limit from the beta-neutrino correlation: the WISArD experiment

Author

E. Liénard, M. Gerbaux, P. Alfaurt, Nathal Severijns, D. Zakoucky, S. Vanlangendonck, X. Fléchard, Dinko Atanasov, V. Araujo-Escalona, J. Giovinazzo, M. Versteegen, M. Roche, S. Grévy, G. Quéméner, L. Nies, T. Kurtukian Nieto, B. Blank, L. Daudin, P. Ascher, P. Wagenknecht, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
History, CERN Lab, magnetic field: high, Physics::Instrumentation and Detectors, Physics beyond the Standard Model, Scalar (mathematics), Weak interaction, 01 natural sciences, Education, Nuclear physics, weak interaction, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, numerical calculations, neutrino: interaction, Physics, nucleus: semileptonic decay, 010308 nuclear & particles physics, new physics, sensitivity, Computer Science Applications, Magnetic field, current: scalar, Beta (plasma physics), radioactivity, Physics::Accelerator Physics, Neutrino, Ground state, Particle Physics - Experiment, Fermi Gamma-ray Space Telescope
Abstract

Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, a βν, is sensitive to the presence of scalar currents. The present limits were established by experimental studies of various nuclear systems with allowed Fermi transitions. A new experiment to improve the constraints on scalar currents is being developed, by the WISArD collaboration at ISOLDE/CERN, where the aim is to measure the energy shift of the β-delayed protons emitted from the isobaric analogue state of the 32Ar ground state. To enhance the sensitivity, protons and positrons are guided by a strong magnetic field and measured in coincidence between the two detection configurations located on both sides of a catcher foil in which the radioactive samples are implanted. Kinematic energy shifts of the protons in coincidence with positrons, in the same or opposite hemisphere of the catcher foil, will be more or less pronounced as a function of the possible scalar current component of the weak interaction. Details of the apparatus and preliminary results of the experiment are presented.

Published
2019
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8. Hybrid model for two-proton radioactivity

Author

J. Giovinazzo, B. Blank, B. A. Brown, 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, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Branching fraction, Nuclear structure, Nuclear Structure, 7. Clean energy, 01 natural sciences, Nuclear physics, Amplitude, 0103 physical sciences, 010306 general physics, Hybrid model
Abstract

International audience; A hybrid model is proposed which combines the nuclear structure part from configuration-interaction (CI) calculations and the emission dynamics from a three-body approach. By normalizing the partial half-lives from the three-body model with CI amplitudes, we can reasonably well reproduce all known experimental two-proton (2p) emission half-lives, except for Kr67. For the purpose of the present paper, the full body of experimental 2p radioactivity data for nuclei for which the half-life and the 2p emission branching ratio are experimentally known has been analyzed in our hybrid model.

Published
2019
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9. Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies

Author

N. Fukuda, Y. Fujita, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, P. A. Söderström, Toshiyuki Kubo, P. Ascher, Kathrin Wimmer, D. S. Ahn, S. Grévy, Shunji Nishimura, A. Boso, S. Yagi, R. B. Cakirli, Shintaro Go, W. Gelletly, C. Sidong, Shigeru Kubono, C. Borcea, Jin Wu, A. Algora, C. Magron, H. Suzuki, Gabor Kiss, J. Giovinazzo, H. Oikawa, J. Chiba, P. Doornenbal, Y. Takei, P. Aguilera, V. Guadilla, A. I. Morales, S.E.A. Orrigo, Daiki Nishimura, G. de Angelis, M. Gerbaux, Naohito Inabe, Hiroyoshi Sakurai, B. A. Brown, P. Vi, Y. Shimizu, F. Diel, D. R. Napoli, Berta Rubio, F. Molina, T. Kurtukian-Nieto, D. Lubos, Jorge Agramunt, M. Tanaka, E. Ganioglu, A. Montaner-Piza, T. Goigoux, 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), 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), 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Isotope, Proton, 010308 nuclear & particles physics, Nuclear Theory, Theoretical models, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; We report on the observation of 67Kr that has been produced in an experiment performed at the RIKEN/BigRIPS facility. The two-proton decay of 67Kr has been evidenced and this nucleus is thus the fourth observed long lived ground-state two-proton emitter, after 45Fe, 48Ni and 54Zn. In addition, the decay of several isotopes in the mass region has been investigated. While for previous cases of two-proton radioactivity, the theoretical models could reproduce the measured data, this is not the case anymore for 67Kr. Two interpretations have been proposed to explain this discrepancy: a transition between real two-proton and sequential decay or the influence of deformation. These hypotheses will be tested in future experiments by measuring the angular and energy correlations of the emitted protons.

Published
2020
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10. Beta decay of the Tz=-2 nucleus 64Se and its descendants

Author

B. Blank, H. Takeda, Toshiyuki Sumikama, E. Ganioglu, G. G. Kiss, A. Algora, P. Aguilera, DeukSoon Ahn, A. I. Morales, Shin-Ichiro Nishimura, A. Montaner-Pizá, F. Molina, Shigeru Kubono, Daiki Nishimura, G. de Angelis, J. Giovinazzo, F. Diel, R. B. Cakirli, J. Chiba, H. Oikawa, Yoshitaka Fujita, W. Gelletly, V. Guadilla, Jorge Agramunt, Berta Rubio, T. Kurtukian, Momoko Tanaka, C. Sidong, Yoshifumi R. Shimizu, Tomio Kubo, P. A. Söderström, P. Vi, N. Fukuda, Y. Takei, A. Boso, C. Borcea, Shintaro Go, Naohito Inabe, C. Magron, S. E. A. Orrigo, S. Grévy, D. Lubos, H. Suzuki, D. R. Napoli, M. Gerbaux, P. Doornenbal, S. Yang, P. Asher, Jinguang Wu, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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 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), and 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)

Subjects
Physics, Paper, History, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Computer Science Applications, Education, ddc, Nuclear physics, Proton radiation, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, Bound state, medicine, 010306 general physics, Nucleus
Abstract

International audience; The beta decay of the Tz=-2 nucleus 64Se has been studied in a fragmentation reaction at RIKEN-Nishina Center. 64Se is the heavies Tz=-2 nucleus that decays to bound states in the daughter nucleus and the heaviest case where the mirror reaction 64Zn(3He,t)64Ga on the Tz=+2 64Zn stable target exists and can be compared. Beta-delayed gamma and proton radiation is reported for the 64Se and 64As cases. New levels have been observed in 64As, 64Ge (N=Z), 63Ge and 63Ga. The associated T1/2 values have been obtained.

Published
2018
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11. $^{67}$Kr Two-proton Radioactivity: Results and Theoretical Interpretations

Author

P. Ascher, J. Giovinazzo, C. Borcea, Daiki Nishimura, G. de Angelis, A. I. Morales, Y. Fujita, Toshiyuki Kubo, W. Gelletly, Shunji Nishimura, D. S. Ahn, V. Guadilla, Gabor Kiss, P. A. Söderström, A. Boso, S. Yagi, H. Suzuki, D. Lubos, Jorge Agramunt, Hiroyoshi Sakurai, Shigeru Kubono, Shintaro Go, R. B. Cakirli, H. Oikawa, S.E.A. Orrigo, Y. Shimizu, C. Sidong, A. Algora, T. Kurtukian Nieto, C. Magron, S. Grévy, J. Chiba, Kathrin Wimmer, P. Doornenbal, P. Aguilera, B. A. Brown, M. Gerbaux, P. Vi, F. Diel, Jin Wu, T. Goigoux, Y. Takei, D. R. Napoli, Berta Rubio, F. Molina, Naohito Inabe, N. Fukuda, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, M. Tanaka, E. Ganioglu, A. Montaner-Piza, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), and 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)

Subjects
Physics, Nuclear physics, Proton, Decay energy, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Branching fraction, Nuclear structure, General Physics and Astronomy, Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy
Abstract

International audience; The two-proton radioactivity is a unique tool to study the nuclear structure beyond the proton drip-line. Since its discovery in 2002, the known emitters have been 19Mg, 45Fe, 48Ni, 54Zn and 67Kr. 67Kr was observed for the first time at the RIKEN Nishina Center in 2015. Its decay energy was measured at 1690(17) keV with a branching ratio of 37(14)%. The half-life, 7.4(30) ms, was found in contradiction with theoretical calculations, pointing out effects of decay dynamics and nuclear deformation.

Published
2018
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12. β decays of the heaviest N=Z−1 nuclei and proton instability of In97

Author

J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu

Subjects
Physics, Nuclear physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Beta (finance), 01 natural sciences, Instability
Published
2018
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13. Gamma-ray branching ratios in the decay of $^{49}$Cr

Author

J. Giovinazzo, B. Blank, P. Ascher, T. Kurtukian Nieto, A. de Roubin, Karl Johnston, T. Goigoux, M. Aouadi, M. Gerbaux, S. Grévy, C. Magron, 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, Nuclear and High Energy Physics, Decay scheme, Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Branching (polymer chemistry), 01 natural sciences, Semiconductor detector, Nuclear physics, 0103 physical sciences, Nuclear fusion, Experimental work, High Energy Physics::Experiment, 010306 general physics
Abstract

The $\gamma$ -decay branching ratios of 49V have been studied in the $\beta$ /EC decay of 49Cr. The $\gamma$ -ray spectrum has been measured with a 70% relative efficiency co-axial germanium detector calibrated in efficiency with a precision of about 0.5%. The primary result is the measurement of the relative branching ratios of the three main $\gamma$ rays in the decay of 49Cr. Large discrepancies were found with a previous experimental work. The 49Cr sample was produced by proton impact on a ZrO2 target and collected at the ISOLDE facility of CERN and enabled us to re-evaluate the decay scheme of 49Cr. The new data allow the use of this nucleus for future high-precision calibration work.

Published
2018
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14. Simultaneous investigation of the T=1(Jπ=0+) and T=0(Jπ=9+) β decays in Br70

Author

A. I. Morales, A. Algora, B. Rubio, K. Kaneko, S. Nishimura, P. Aguilera, S. E. A. Orrigo, F. Molina, G. de Angelis, F. Recchia, G. Kiss, V. H. Phong, J. Wu, D. Nishimura, H. Oikawa, T. Goigoux, J. Giovinazzo, P. Ascher, J. Agramunt, D. S. Ahn, H. Baba, B. Blank, C. Borcea, A. Boso, P. Davies, F. Diel, Zs. Dombrádi, P. Doornenbal, J. Eberth, G. de France, Y. Fujita, N. Fukuda, E. Ganioglu, W. Gelletly, M. Gerbaux, S. Grévy, V. Guadilla, N. Inabe, T. Isobe, I. Kojouharov, W. Korten, T. Kubo, S. Kubono, T. Kurtukián Nieto, N. Kurz, J. Lee, S. Lenzi, J. Liu, T. Lokotko, D. Lubos, C. Magron, A. Montaner-Pizá, D. R. Napoli, H. Sakurai, H. Schaffner, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, Y. Takei, M. Tanaka, and S. Yagi

Subjects
Physics, Spins, 010308 nuclear & particles physics, Branching fraction, Time decay, Prolate spheroid, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Pi, Atomic physics, 010306 general physics, Ground state, Excitation
Abstract

The $\beta$ decay of the odd-odd nucleus $^{70}$Br has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The $T=0$ ($J^{\pi}=9^+$) and $T=1$ ($J^{\pi}=0^+$) isomers have both been produced in in-flight fragmentation of $^{78}$Kr with ratios of 41.6(8)\% and 58.4(8)\%, respectively. A half-life of $t_{1/2}=2157^{+53}_{-49}$ ms has been measured for the $J^{\pi}=9^+$ isomer from $\gamma$-ray time decay analysis. Based on this result, we provide a new value of the half-life for the $J^{\pi}=0^+$ ground state of $^{70}$Br, $t_{1/2}=78.42\pm0.51$ ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the $2^+_1$ state in the daughter nucleus $^{70}$Se, $R(2^+_1)=1.3\pm1.1\%$. We also report four new low-intensity $\gamma$-ray transitions at 661, 1103, 1561, and 1749 keV following the $\beta$ decay of the $J^{\pi}=9^+$ isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in $^{70}$Se with most probable spins and parities of $J^{\pi}=(6^+)$ and $(8^+)$, respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.

Published
2017
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15. Beta Decay Study of the Tz=−2 56Zn Nucleus and the Determination of the Half-Lives of a Few fp-shell Nuclei

Author

B. Rubio, S.E.A. Orrigo, L. Kucuk, A. Montaner-Pizá, Y. Fujita, H. Fujita, B. Blank, W. Gelletly, T. Adachi, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R.B. Cakirli, G. de France, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grevy, O. Kamalou, H.C. Kozer, T. Kurtukian-Nieto, F.M. Marqués, F. Molina, Y. Oktem, F. de Oliveira Santos, L. Perrot, L. Popescu, R. Raabe, A.M. Rogers, P.C. Srivastava, G. Susoy, T. Suzuki, A. Tamii, and J.C. Thomas

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Nuclear Theory, Nuclear data, Half-life, Beta decay, Nuclear physics, medicine.anatomical_structure, Fragmentation (mass spectrometry), Double beta decay, medicine, Mirror nuclei, Atomic physics, Nuclear Experiment, Nucleus
Abstract

This paper concerns the experimental study of the β decay properties of few proton-rich fp -shell nuclei. The nuclei were produced at GANIL in fragmentation reactions, separated with the LISE spectrometer and stopped in an implantation detector surrounded by Ge detectors. The β -delayed gammas, β -delayed protons and the exotic β -delayed gamma-proton emission have been studied. Preliminary results are presented. The decay of the T z = − 2 nucleus 56 Zn has been studied in detail. Information from the β -delayed protons and β -delayed gammas has been used to deduce the decay scheme. The exotic beta-delayed gamma-proton decay has been observed for the first time in the fp -shell. The interpretation of the data was made possible thanks to the detailed knowledge of the mirror Charge Exchange (CE) process and the gamma de-excitation of the states in 56 Co, the mirror nucleus of 56 Cu.

Published
2014
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16. Upgrade of the SPIRAL identification station for high-precision measurements of nuclear β decay

Author

P. Delahaye, H. Bouzomita, D. Pérez-Loureiro, R. A. E. Austin, F Bucaille, Julien Gibelin, J. C. Thomas, T. Kurtukian-Nieto, B. Blank, G. C. Ball, G. Frémont, A. Lefevre, F. Legruel, K. G. Leach, J. Giovinazzo, A. T Laffoley, G. F. Grinyer, G Lescalie, P. Finlay, J Grinyer, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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)-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), Department of Astronomy and Physics [Halifax], Saint Mary's University [Halifax], TRIUMF [Vancouver], Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Department of Physics [Guelph], University of Guelph, 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), 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)-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), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Tape transport system, Nuclear and High Energy Physics, Particle physics, Branching ratios, Electroweak interaction, Superallowed Fermi β decay, Q3 Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Half-lives, Nuclear physics, Upgrade, Isospin, Mirror β decay, Geant4 simulations, Design study, Physics::Accelerator Physics, High Energy Physics::Experiment, Ion trap, Instrumentation, Spiral, Fermi Gamma-ray Space Telescope
Abstract

The low-energy identification station at SPIRAL (Systeme de Production d'Ions Radioactifs Acceleres en Ligne) has been upgraded for studying the β decays of short-lived radioactive isotopes and to perform high-precision half-life and branching-ratio measurements for superallowed Fermi and isospin T= 1 / 2 mirror β decays. These new capabilities, combined with an existing Paul trap setup for measurements of β–ν angular-correlation coefficients, provide a powerful facility for investigating fundamental properties of the electroweak interaction through nuclear β decays. A detailed description of the design study, construction, and first results obtained from an in-beam commissioning experiment on the β+ decays 14 O and 17F are presented.

Published
2014
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17. Two-Proton Radioactivity ofKr67

Author

C. Magron, R. B. Cakirli, Daiki Nishimura, G. de Angelis, Toshiyuki Kubo, V. H. Phong, Shunji Nishimura, D. S. Ahn, D. Lubos, P. Ascher, S. Yagi, Hiroyoshi Sakurai, A. Boso, J. Agramunt, V. Guadilla, W. Gelletly, J. Chiba, Y. Shimizu, Shigeru Kubono, B. A. Brown, J. Giovinazzo, F. Diel, H. Oikawa, Y. Fujita, A. Montaner-Pizá, Gabor Kiss, T. Goigoux, C. Borcea, P. Aguilera, Shintaro Go, F. Molina, A. I. Morales, P. A. Söderström, T. Kurtukian Nieto, P. Doornenbal, Momoko Tanaka, Naohito Inabe, M. Gerbaux, S. Grévy, D. R. Napoli, B. Rubio, Kathrin Wimmer, N. Fukuda, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, Jin Wu, Y. Takei, E. Ganioglu, H. Suzuki, and Alejandro Algora

Subjects
Physics, Proton, 010308 nuclear & particles physics, Branching fraction, Q value, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Decay energy, 0103 physical sciences, Atomic physics, 010306 general physics, Common emitter, Line (formation)
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from 67Kr. At the same time, no evidence for 2p emission of 59Ge and 63Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to 67Kr as being the best new candidate among the three for two-proton radioactivity. 67Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of 67Kr is 7.4(30) ms.

Published
2016
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18. High-precision Half-life And Branching Ratio Measurements For Superallowed $\beta^+$ Emitters At TRIUMF-ISAC

Author

Steffen Ketelhut, J. R. Leslie, C. E. Svensson, A. Diaz Varela, P. Voss, B. Blank, A. Valencik, P. C. Bender, A. J. Radich, J. P. Thomas, Joochun Park, J. Giovinazzo, Aaron Chester, S. Triambak, J. Wong, I. S. Towner, G. C. Ball, Corina Andreoiu, D. W. Miller, C. Unsworth, A. B. Garnsworthy, R. Dunlop, K. Starosta, D. S. Jamieson, B. Jigmeddorj, J. Grinyer, H. Bidaman, W. J. Mills, Mustafa Rajabali, E. R. Tardiff, E. F. Zganjar, G. Hackman, A. T. Laffoley, A. D. MacLean, P. Finlay, M. Moukaddam, E. T. Rand, D. S. Cross, S. Chagnon-Lessard, R. A. E. Austin, Z. M. Wang, S. W. Yates, G. F. Grinyer, J. Glister, K. G. Leach, J. Turko, D. Kisliuk, G. Deng, V. Bildstein, S. J. Williams, H. Bouzomita, Baharak Hadinia, Michelle Dunlop, P. E. Garrett, T. Ballast, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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 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), and 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)

Subjects
Nuclear physics, Physics, Spectrometer, Branching fraction, Electroweak interaction, Half-life, Weak interaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Fermi Gamma-ray Space Telescope
Abstract

High precision measurements of the $ft$ values for superallowed Fermi $\beta$ transitions between $J^\pi~=~0^+$ isobaric analogue states allow for stringent tests of the electroweak interaction described by the Standard Model. These transitions provide an experimental probe of the Conserved-Vector-Current hypothesis, enable the most precise determination of the up-down ($V_{ud}$) element of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix, and allow one to set stringent limits on the existence of scalar currents in the weak interaction. An extensive program of superallowed branching-ratio and half-life measurements at TRIUMF's Isotope Separator and Accelerator (ISAC) facility has covered the full range of superallowed emitters, from the lightest case, $^{10}$C, to the heaviest case for which precision data are currently available, $^{74}$Rb. These experiments have been performed using a 4$\pi$ continuous-flow gas proportional $\beta$ counter, the 8$\pi$ $\gamma$-ray spectrometer, and, most recently, the new high-efficiency GRIFFIN $\gamma$-ray spectrometer. In this paper, recent highlights from the superallowed Fermi $\beta$ decay program at TRIUMF will be summarized, including high-precision half-life measurements for all three of the lightest superallowed emitters, $^{10}$C, $^{14}$O, and $^{18}$Ne, with the greatest sensitivity to a potential weak scalar current contribution, as well as high-precision branching-ratio measurements for the heavy superallowed emitters $^{62}$Ga and $^{74}$Rb.

Published
2016
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19. Beta Decay Studies of Proton Rich Nuclei, an Important Ingredient for rp-Process Calculations

Author

B. Rubio, L. Kucuk, S. E. A. Orrigo, Y. Fujita, W. Gelletly, B. Blank, T. Adachi, P. Aguilera, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R. B. Cakirli, G. de France, F. de Oliveira Santos, H. Fujita, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grévy, O. Kamalou, H. C. Kozer, T. Kurtukian-Nieto, M. Marqués, F. Molina, D. Nishimura, H. Oikawa, Y. Oktem, L. Perrot, L. Popescu, R. Raabe, A. M. Rogers, P. C. Srivastava, G. Susoy, C. Stodel, T. Suzuki, A. Tamii, J. C. Thomas, Instituto de Fisica Corpuscular ( IFIC ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ) -Universitat de València ( UV ), Istanbul University, Research Center for Nuclear Physics ( RCNP ), Osaka University [Osaka], Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), 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 ), Istambul University, 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 ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Physics, Tokyo University of Science, Noda, Chiba, Laboratoire de psychologie de Caen Normandie ( LPCN ), Normandie Université ( NU ) -Normandie Université ( NU ), Centre d'Etude de l'Energie Nucléaire ( SCK-CEN ), Argonne National Laboratory (ANL) - Physics Division (PHY), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Research Center for Nuclear Physics (RCNP), University of Surrey (UNIS), 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), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), 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), 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), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Proton, 010308 nuclear & particles physics, Chemistry, Radiochemistry, rp-process, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, Ingredient, 0103 physical sciences, beta decay experiments, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, fragmentation facilities
Abstract

International audience; We have performed a series of beta-decay experiments at fragmentation facilities on T$_z$ = −1/2, T$_z$ = −1, and T$_z$ = −2 nuclei. Most of these nuclei lie on the rp-process path and therefore some of the quantities we have measured such as T$_{1/2}$ values are important ingredients in performing reaction flow calculations for light curve estimates and testing astrophysical models of X-ray bursters. At this conference we have presented the results of measurements of T$_{1/2}$ values for 25 nuclei and compared with previous values.

Published
2016
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20. New neutron-deficient isotopes from $^{78}$Kr fragmentation

Author

Shigeru Kubono, Daiki Nishimura, G. de Angelis, Y. Fujita, M. Gerbaux, Hiroyoshi Sakurai, C. Borcea, D. S. Ahn, J. Chiba, Shunji Nishimura, D. Lubos, C. Magron, D. R. Napoli, S. Yagi, H. Suzuki, B. Rubio, J. Agramunt, V. Guadilla, P. A. Söderström, P. Ascher, Toshiyuki Kubo, Naohito Inabe, Jin Wu, Y. Shimizu, H. Oikawa, J. Giovinazzo, Shintaro Go, A. Boso, W. Gelletly, Alejandro Algora, Kathrin Wimmer, F. Diel, Gabor Kiss, F. Molina, R. B. Cakirli, V. H. Phong, T. Kurtukian Nieto, Y. Takei, E. Ganioglu, S. Grévy, N. Fukuda, B. Blank, Toshiyuki Sumikama, P. Doornenbal, Hiroyuki Takeda, S. E.A. Orrigo, T. Goigoux, M. Tanaka, P. Aguilera, A. I. Morales, A. Montaner-Pizá, 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), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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), 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a $^{78}$Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and $^{63}$Se, $^{67}$Kr, and $^{68}$Kr were identified for the first time. In addition, $^{59}$Ge was also observed. Three of these isotopes, $^{59}$Ge, $^{63}$Se, and $^{67}$Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes $^{58}$Ge, $^{62}$Se, and $^{66}$Kr were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parameterization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region., accepted as Rapid Communication in PRC

Published
2016
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21. High-precision half-life measurements of atomic nuclei

Author

J. Giovinazzo, I. Matea, B. Blank, G. Canchel, T. Kurtukian Nieto, A. Bacquias, and J. Souin

Subjects
Nuclear physics, Physics, Coupling constant, Nuclear and High Energy Physics, Series (mathematics), Atomic nucleus, Physical and Theoretical Chemistry, Atomic physics, Weak interaction, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Standard Model
Abstract

In a series of measurements performed at the IGISOL facility at the Accelerator Laboratory of the University of Jyvaskyla, the half-lives of 26Si, 29P, 30,31S, 42Ti and 62Ga were measured with high precision. These half-lives are important ingredients for tests of the weak-interaction standard model and allow, together with other experimental inputs and theoretical correction terms, the determination of the vector coupling constant of the weak interaction. The IGISOL method used in Jyvakyla is an ideal tool for these measurements as it allows to access all elements without distinction of their chemical properties.

Published
2012
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22. The decay of proton-rich nuclei in the mass region

Author

S. Czajkowski, A. Bey, A. J. Boston, F. Becker, M. Caamaño, F. de Oliveira Santos, Robert Grzywacz, S. Grévy, P. Mayet, Margareta Hellström, C. Dossat, F. Aksouh, Marielle Chartier, V. A. Maslov, C. Moore, M. Stanoiu, Georgi P. Georgiev, D. Cortina, A Fleury, J. Giovinazzo, M. Pfützner, J. C. Thomas, C. Mazzocchi, M. J. Lopez Jimenez, B. Blank, D. Karamanis, I. Matea, C. Borcea, Michio Honma, Z. Janas, J. Kurcewicz, M. Lewitowicz, G. Canchel, N. Adimi, I. Stefan, R. Borcea, and M.S. Pravikoff

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Half-life, 01 natural sciences, 7. Clean energy, Mass formula, Nuclear physics, 0103 physical sciences, Isobaric process, Atomic physics, Proton emission, Nuclear Experiment, 010306 general physics, Multiplet
Abstract

In a series of experiments at the SISSI/LISE3 facility of GANIL conducted between 1999 and 2004, we have collected decay information for proton-rich nuclei between {sup 36}Ca and {sup 56}Zn. The data allowed us to study the decay properties of 26 nuclei. The main experimental information obtained for all nuclei is their {beta}-decay half-life and their total {beta}-delayed proton emission branching ratio. For many nuclei, individual proton groups and {gamma} rays were identified and allowed us to establish first partial decay schemes for some of the nuclei studied. In addition, mass-excess values have been determined for some of the nuclei by means of the isobaric multiplet mass equation. For {sup 50}Ni, the decay via {beta}-delayed two-proton emission could be tentatively identified. The decay of {sup 49}Ni allowed for the first time to identify the first 2{sup +} state in {sup 48}Fe. The experimental data are confronted to model predictions for the half-life and the mass-excess values.

Published
2007
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23. Competition of β-delayed protons and β-delayed γ rays in $^{56}$Zn and the exotic β-delayed γ-proton decay

Author

H. Fujita, S. Grévy, Takatoshi Suzuki, Atsushi Tamii, B. Bilgier, B. Rubio, J. C. Thomas, G. Susoy, Y. Fujita, C. Stodel, O. Kamalou, A. Algora, J. Giovinazzo, Jorge Agramunt, S. E. A. Orrigo, W. Gelletly, A. M. Rogers, M. Gerbaux, H. C. Kozer, B. Blank, P. Ascher, R. B. Cakirli, E. Ganioglu, Lucia Popescu, L. Kucuk, F. Molina, T. Kurtukian-Nieto, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), 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), 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), V. Greco, M. La Cognata, S. Pirrone, F. Rizzo, C. Spitaleri, 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 010308 nuclear & particles physics, Proton decay, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, I. Heavy and Superheavy Elements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Beta (velocity), Nuclear Experiment, 010306 general physics
Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.ISBN: 978-88-7438-101-2, Expérience GANIL/LISE3/EXOGAM; International audience; Remarkable results have been published recently on the β decay of 56Zn. In particular, the rare and exotic β-delayed γ-proton emission has been detected for the first time in the fp shell. Here we focus the discussion on this exotic decay mode and on the observed competition between β-delayed protons and β-delayed γ rays from the Isobaric Analogue State.

Published
2015
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24. Half-life and branching ratios for the $\beta$ decay of $^{38}$Ca

Author

F. Munoz, I. Matea, L. Audirac, L. Caceres, B. Blank, G. Canchel, J. Giovinazzo, N. A. Smirnova, M. Gerbaux, P. Ascher, F. Didierjean, J. Souin, L. Serani, J. C. Thomas, A. Bacquias, F. de Oliveira Santos, T. Kurtukian Nieto, L. Daudin, M. Roche, S. Grévy, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), 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), GANILEXP, 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), 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), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Hadron, Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Branching (polymer chemistry), 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Distribution (mathematics), 0103 physical sciences, medicine, Nuclear fusion, Nuclide, 010306 general physics, Nucleus
Abstract

In an experiment at the LISE3 facility of GANIL, we have studied with high precision the $0^{+}\rightarrow 0^{+}$ $ \beta$ decay of 38Ca. The LISE3 facility allowed to produce close to pure samples of the nuclide of interest. We measured the half-life of this nucleus to be 443.63(35)ms, whereas the super-allowed branching ratio was determined to be 77.14(35)%. Both data are in nice agreement with previous high-precision measurements and thus improve the overall precision of the experimental inputs to determine the corrected $F t$ value for this nucleus. We also compare the experimental Gamow-Teller strength distribution with theoretical shell-model predictions. Finally, future opportunities at LISE3 are discussed.

Published
2015
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25. Competition between $β$-delayed proton and $β$-delayed $γ$ decay of the exotic $T_z$ = -2 nucleus $^{56}$Zn and fragmentation of the IAS

Author

B. Bilgier, S. E. A. Orrigo, O. Kamalou, L. Kucuk, Yoshitaka Fujita, B. Blank, P. Ascher, B. Rubio, G. Susoy, S. Grévy, Atsushi Tamii, T. Suzuki, L. Popescu, J. Giovinazzo, W. Gelletly, J. Agramunt, T. Kurtukian-Nieto, H. C. Kozer, F. Molina, M. Gerbaux, A. M. Rogers, E. Ganioglu, R. B. Cakirli, J. C. Thomas, H. Fujita, C. Stodel, L. Cáceres, A. Algora, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), GANILEXP, 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), and 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)

Subjects
Isospin mixing, Nuclear Theory, proton-rich nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Isospin symmetry, Nuclear physics, symbols.namesake, Fragmentation (mass spectrometry), 56Zn, 0103 physical sciences, medicine, Matrix element, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Charge-exchange reactions, Nuclear structure, delayed -proton decay, fragmentation of the IAS, medicine.anatomical_structure, symbols, Atomic physics, Gamow-Teller transitions, Hamiltonian (quantum mechanics), Nucleus, Excitation, Fermi Gamma-ray Space Telescope
Abstract

Proceedings of the 2nd Conference on Advances in Radioactive Isotope Science ARIS2014. 6 pages, 4 figures; International audience; A very exotic decay mode at the proton drip-line, $\beta$-delayed $\gamma$-proton decay, has been observed in the $\beta$ decay of the $T_z$ = -2 nucleus $^{56}$Zn. Three $\gamma$-proton sequences have been observed following the $\beta$ decay. The fragmentation of the IAS in $^{56}$Cu has also been observed for the first time. The results were reported in a recent publication. At the time of publication the authors were puzzled by the competition between proton and $\gamma$ decays from the main component of the IAS. Here we outline a possible explanation based on the nuclear structure properties of the three nuclei involved, namely $^{56}$Zn, $^{56}$Cu and $^{55}$Ni, close to the doubly magic nucleus $^{56}$Ni. From the fragmentation of the Fermi strength and the excitation energy of the two populated 0$^{+}$ states we could deduce the off-diagonal matrix element of the charge-dependent part of the Hamiltonian responsible for the mixing. These results are compared with the decay of $^{55}$Cu with one proton less than $^{56}$Zn. For completeness we summarise the results already published.

Published
2015
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26. The β-decay of 22Al

Author

B. Blank, C. Longour, Alison Laird, J. Giovinazzo, S. Czajkowski, Ari Jokinen, K. Peräjärvi, F. de Oliveira Santos, M. Lewitowicz, Peter Dendooven, Juha Äystö, N. L. Achouri, A. Emsallem, G. Canchel, J. C. Thomas, M. Stanoiu, N. Guillet, and N. Smirnova

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Branching fraction, Half-life, Alpha particle, 01 natural sciences, Beta decay, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Radioactive decay
Abstract

In an experiment performed at the LISE3 facility of GANIL, we studied the decay of 22Al produced by the fragmentation of a 36Ar primary beam. A β-decay half-life of T1/2 = 91.1±0.5ms was measured. The β-delayed one- and two-proton emission as well as β-α and β-delayed γ-decays were measured and allowed us to establish a partial decay scheme for this nucleus. New levels were determined in the daughter nucleus 22Mg. The comparison with model calculations strongly favours a spin-parity of Iπ = 4+ for the ground state of 22Al.

Published
2006
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27. The two-proton radioactivity in the A ∼ 50 mass region

Author

J Giovinazzo, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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 P. Regan, P. Stevenson

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Proton decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Nucleus
Abstract

International audience; After $^{45}$Fe, another precursor nucleus for two-proton radioactivity has been observed: $^{54}$Zn. It has been produced and identified in an experiment performed at the GANIL/LISE3 facility. In addition to this first observation of $^{54}$Zn and its two-proton decay, the experiment allowed for a confirmation of previous results on the two-proton decay of $^{45}$Fe and of the existence of $^{48}$Ni, and gave first indications about its decay.

Published
2005
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28. Two-proton decay of 45Fe: a new type of radioactivity

Author

M. Lewitowicz, B. Blank, C. Borcea, F. de Oliveira Santos, M.S. Pravikoff, V. A. Maslov, A. Fleury, M. Pfützner, J. Giovinazzo, S. Czajkowski, M. J. Lopez Jimenez, Robert Grzywacz, J. C. Thomas, Marielle Chartier, M. Stanoiu, and B. A. Brown

Subjects
Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Detector, Coincidence, Nuclear physics, Decay energy, Beta particle, Physics::Accelerator Physics, High Energy Physics::Experiment, Proton emission, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip-line nucleus Fe45 has been studied after projectile fragmentation of a Ni58 primary beam at 75 MeV/nucleon impinging on a natural nickel target. Fragment-implantation events have been correlated with radioactive decay events in a 16x16 pixel silicon strip detector on an event-by-event basis. The decay-energy spectrum of Fe45 implants shows a distinct peak at (1.06+/-0.04)MeV with a half-life of T1/2 = (4.7+3.4-1.4)ms. None of the events in this peak is in coincidence with beta particles which were searched for in a detector next to the implantation detector. For a longer correlation interval, daughter decays of the two-proton daughter Cr43 can be observed after Fe45 implantation. The decay energy for Fe45 agrees nicely with several theoretical predictions for two-proton emission. Barrier-penetration calculations slightly favour a di-proton emission picture over an emission of two individual protons and point thus to a He2 emission mode.

Published
2003
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29. First observation of two-proton radioactivity from an atomic nucleus

Author

M. Pfützner, Bertram Blank, and J. Giovinazzo

Subjects
Physics, Range (particle radiation), Proton, Nuclear Theory, General Engineering, Nuclear structure, Energy Engineering and Power Technology, Nuclear physics, Nuclear fission, Excited state, Atomic nucleus, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, Spontaneous fission
Abstract

Nature uses radioactivity to gain stability for an unstable atomic nucleus. The discovery of radioactivity is considered the starting point of nuclear physics. The classical types of radioactivity, α, β, γ decay and nuclear fission, have allowed for many detailed studies of nuclear structure and have found a wide range of applications in other fields of science. According to theoretical predictions, other types of nuclear transformation should occur for very short lived atomic nuclei. In recent experiments at the GANIL and GSI laboratories, two-proton radioactivity was observed for the first time in the decay of proton-rich 45Fe. To cite this article: B. Blank et al., C. R. Physique 4 (2003).

Published
2003
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30. Beta-decay of the N = Z nucleus 72Kr

Author

V. Rauch, A. Knipper, A. Huck, Ph. Dessagne, Olof Tengblad, J. Giovinazzo, A. Jokinen, Ch. Miehé, M. Ramdhane, María José García Borge, Inmaculada Piqueras, G. Marguier, G. Walter, and C. Longour

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Decay scheme, Branching fraction, Hadron, Quasiparticle, Atomic physics, Random phase approximation, Ground state, Wave function, Beta decay
Abstract

The beta-decay of the N = Z, even-even nucleus 72Kr has been studied at the ISOLDE PSB facility at CERN. Measurements of βγ and βγγ coincidences have enriched the decay scheme of the daughter nucleus 72Br with 27 new low spin levels. A more precise half-life of T1/2 = 17.1(2) s has been determined. Strong feeding to the 72Br ground state is established yielding an unambiguous Jπ = 1+ assignment for this state. Candidates for the 72Br g.s. wave function are discussed in the framework of a self-consistent deformed mean-field calculation with SG2 Skyrme force and pairing correlations. A search for beta-delayed particle emission was made and an upper limit of 10-6 for this decay branch obtained. The cumulated experimental level density of 1+ states has been fitted with the constant temperature formula. The comparison indicates that most likely all 1+ levels up to 1.2 MeV have been observed in this investigation. The corresponding nearest-neighbour level spacing does not follow a Poisson distribution. The Gamow-Teller strength distribution is compared, in terms of nuclear deformation, with different calculations made in the framework of the quasiparticle random phase approximation.

Published
2003
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31. Beta-decay half-lives of new neutron-rich isotopes of Re, Os and Ir approaching the r-process path near N = 126

Author

F. Becker, Enrique Casarejos, B. Jurado, F. Farget, O. Yordanov, Karlheinz Langanke, K.-H. Schmidt, B. Blank, Daniela Henzlova, L. Audouin, J. Benlliure, J. Giovinazzo, Gabriel Martínez-Pinedo, M. Fernandez-Ordoñez, Ivan Borzov, J. Pereira, T. Kurtukian-Nieto, 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), Noyaux exotiques (NEX), 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)-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), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), 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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nuclear physics, Fragmentation (mass spectrometry), r-process, Nuclear fusion, Neutron, Nuclide, Atomic physics
Abstract

Expérience à GSI/FRS; Heavy neutron-rich nuclei close to N = 126 were produced by fragmentation of a 1A GeV 208Pb beam at the FRS at GSI. The β-decay half-lives of 7 nuclides have been determined using a novel numerical analysis method. The half-lives of 202,199Ir, 200,199Os and 196Re are reported for the first time. The comparison of the data with model calculations provides indications on the importance of first-forbidden transitions on the β-decay of nuclei around N = 126 and Z < 82.

Published
2014
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32. $\beta $-delayed $\gamma $-proton Decay in $^{56}$Zn: Analysis of the Charged-particle Spectrum

Author

H. C. Kozer, Lucia Popescu, Toshio Suzuki, L. Caceres, L. Kucuk, J. C. Thomas, R. B. Cakirli, P. Ascher, A. M. Rogers, Ch. Stodel, J. Agramunt, Berta Rubio, Yoshitaka Fujita, F. Molina, G. Susoy, S. E. A. Orrigo, M. Gerbaux, J. Giovinazzo, Alejandro Algora, O. Kamalou, H. Fujita, T. Kurtukian-Nieto, E. Ganioglu, B. Blank, Atsushi Tamii, B. Bilgier, S. Grévy, W. Gelletly, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), GANILEXP, 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), and 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)

Subjects
Physics, 010308 nuclear & particles physics, Proton decay, Spectrum (functional analysis), Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, 23.40.–s, 23.50.+z, 21.10.–k, 27.40.+z, Nuclear physics, medicine.anatomical_structure, Beta (plasma physics), 0103 physical sciences, medicine, High Energy Physics::Experiment, Física nuclear, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleus
Abstract

A study of the $\beta$ decay of the proton-rich $T_{z}$ = -2 nucleus $^{56}$Zn has been reported in a recent publication. A rare and exotic decay mode, $\beta$-delayed $\gamma$-proton decay, has been observed there for the first time in the $fp$ shell. Here we expand on some of the details of the data analysis, focussing on the charged particle spectrum., Comment: Proceedings of the Zakopane Conference on Nuclear Physics 2014 "Extremes of the Nuclear Landscape". 4 pages, 4 figures

Published
2014
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33. Multiparticle emission in the decay ofAr31

Author

Antti Saastamoinen, J. C. Thomas, M. J. G. Borge, G. T. Koldste, Ángel Perea, J. H. Kusk, B. Blank, E. Picado, José Antonio Briz, J. Giovinazzo, M. Carmona-Gallardo, Thomas Nilsson, T. Kurturkian-Nieto, J. Van de Walle, K. Riisager, L. M. Fraile, Ari Jokinen, H. O. U. Fynbo, Olof Tengblad, Björn Jonson, V. Pesudo, B. D. Grann, and J. G. Johansen

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Branching fraction, Gamma ray, 7. Clean energy, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Isobaric process, Beta (velocity), Atomic physics, 010306 general physics, Nucleus, Spin-½, Fermi Gamma-ray Space Telescope
Abstract

A multihit capacity setup was used to study the decay of the dripline nucleus Ar-31, produced at the ISOLDE facility at CERN. A spectroscopic analysis of the beta-delayed three-proton decay of Ar-31 is presented for the first time together with a quantitative analysis of the beta-delayed 2p gamma decay. A new method for determination of the spin of low-lying levels in the beta p daughter 30S using proton-proton angular correlations is presented and used to determine that the spin of the 5.2-MeV level is most likely 3(+) with 4(+) also possible. The half-life of Ar-31 is found to be 15.1(3) ms. An improved analysis of the Fermi beta strength including the beta 3p-decay mode gives a total measured branching ratio of 3.60(44)%, which is lower than the theoretical value found to be 4.24(43)%. Finally, a previously unidentified. transition from the isobaric analog state in the decay of Ar-33 has been found.

Published
2014
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34. Observation of theβ-Delayedγ-Proton Decay ofZn56and its Impact on the Gamow-Teller Strength Evaluation

Author

B. Bilgier, E. Ganioǧlu, S. Grévy, J. Giovinazzo, B. Rubio, P. Ascher, A. M. Rogers, J. C. Thomas, W. Gelletly, Atsushi Tamii, Hisanori Fujita, H. C. Kozer, Lucia Popescu, Y. Fujita, L. Kucuk, F. Molina, B. Blank, M. Gerbaux, T. Kurtukian-Nieto, S. E.A. Orrigo, O. Kamalou, C. Stodel, Takashi Suzuki, Alejandro Algora, J. Agramunt, L. Caceres, G. Susoy, and R. B. Cakirli

Subjects
Nuclear physics, Physics, Proton decay, Isospin, Double beta decay, Nuclear Theory, General Physics and Astronomy, High Energy Physics::Experiment, Nuclear Experiment, Nuclear theory, Beta decay, Fermi Gamma-ray Space Telescope
Abstract

We report the observation of a very exotic decay mode at the proton drip line, the $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-proton decay, clearly seen in the $\ensuremath{\beta}$ decay of the ${T}_{z}=\ensuremath{-}2$ nucleus $^{56}\mathrm{Zn}$. Three $\ensuremath{\gamma}$-proton sequences have been observed after the $\ensuremath{\beta}$ decay. Here this decay mode, already observed in the $sd$ shell, is seen for the first time in the $fp$ shell. Both $\ensuremath{\gamma}$ and proton decays have been taken into account in the estimation of the Fermi and Gamow-Teller strengths. Evidence for fragmentation of the Fermi strength due to strong isospin mixing is found.

Published
2014
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35. High-Precision Half-Life Measurements for the Superallowed Fermi $\beta$+ Emitters $^{14}$O and $^{18}$Ne

Author

B. Hadinia, A. J. Radich, G. Deng, K. G. Leach, Corina Andreoiu, J. C. Thomas, A. B. Garnsworthy, D. S. Jamieson, E. R. Tardiff, D.W. Miller, H. Bouzomita, G. F. Grinyer, G. C. Ball, A. D. MacLean, Bertram Blank, Steffen Ketelhut, P. C. Bender, D. S. Cross, Rae Austin, M. Moukaddam, P. Voss, Mustafa Rajabali, H. Bidaman, E. T. Rand, J. Giovinazzo, B. Mills, M. R. Dunlop, A. T. Laffoley, A. Diaz Varela, P. Finlay, V. Bildstein, R. Dunlop, C. Unsworth, D. Kisliuk, P. E. Garrett, B. Jigmeddorj, J. Turko, J Grinyer, J. R. Leslie, C. E. Svensson, 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), 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), 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear physics, Physics, Oxygen-14, half-life, Neon-18, Half-life, Superallowed beta decay, Beta (velocity), Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS, Fermi Gamma-ray Space Telescope
Abstract

International audience

Published
2014
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36. Production cross sections of heavy neutron-rich nuclei approaching the nucleosynthesis r-process path around A = 195

Author

F. Becker, J. Pereira, M. Fernandez-Ordoñez, K.-H. Schmidt, B. Blank, T. Kurtukian-Nieto, Enrique Casarejos, Daniela Henzlova, J. Giovinazzo, L. Audouin, F. Farget, O. Yordanov, J. Benlliure, B. Jurado, 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), Noyaux exotiques (NEX), 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)-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), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), 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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 26.30.Hj, 25.70.Mn, 27.80.+w, Nucleosynthesis, Path (graph theory), r-process, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2014
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37. Beta decay of the exotic Tz = - 2, $^{56}$Zn nucleus and half-life of various proton-rich Tz = -1 nuclei

Author

B. Rubio, E. Ganioglu, W. Gelletly, H. C. Kozer, Lucia Popescu, F. Molina, L. Kucuk, T. Kurtukian-Nieto, B. Blank, A. M. Rogers, J. C. Thomas, S. E.A. Orrigo, Takashi Suzuki, G. Susoy, O. Kamalou, J. Giovinazzo, M. Gerbaux, Y. Fujita, Alejandro Algora, Hisanori Fujita, Atsushi Tamii, B. Bilgier, S. Grévy, P. Ascher, C. Stodel, R. B. Cakirli, J. Agramunt, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Noyaux exotiques (NEX), 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)-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), Department of Physics, University of Surrey, University of Surrey (UNIS), 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), Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, SKC CEN, Belgique, Physics Division, Argonne National Laboratory, Argonne National Laboratory [Lemont] (ANL), 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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear physics, 23.40.-s, 23.50.+z, 21.10.-k, 27.40.+z, medicine.anatomical_structure, Proton, medicine, General Physics and Astronomy, Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nucleus
Abstract

Expérience GANIL/LISE3/EXOGAM; International audience; Preliminary results of an experimental study of the beta -decay of the exotic T$_z$ = - 2, $^{56}$Zn nucleus and other proton-rich T$_z$ = -1 nuclei are presented. The ions were produced at GANIL using fragmentation reactions, separated by the LISE3 spectrometer and implanted in a double-sided silicon strip detector surrounded by Ge detectors. The half-lives of $^{56}$Zn and four T$_z$ = -1 nuclei in the fp-shell have been measured. While the decay of the T$_z$ = -1 nuclei proceeds essentially by -delayed gamma emission, in the case of $^{56}$Zn -delayed proton emission is also observed. Moreover, the exotic -delayed gamma-proton decay is seen for the first time. The information from the decay study has been used to determine the absolute Fermi and Gamow-Teller transition strengths. The results for $^{56}$Zn have been compared with the mirror Charge Exchange process, the ($^3$He,t) reaction on the T$_z$ = +2, $^{56}$Fe target nucleus. This comparison is important for understanding the $^{56}$Zn decay data.

Published
2014
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38. Sizeable beta-strength in $^{31}$Ar (β3p) decay

Author

J. A. Briz, G. T. Koldste, K. Riisager, H. O. U. Fynbo, Olof Tengblad, M. J. G. Borge, Thomas Nilsson, T. Kurturkian-Nieto, J. Giovinazzo, E. Picado, M. Carmona-Gallardo, J. Van de Walle, Antti Saastamoinen, Ari Jokinen, B. Blank, L. M. Fraile, Ángel Perea, J. C. Thomas, J. G. Johansen, Björn Jonson, V. Pesudo, Noyaux exotiques (NEX), 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)-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), 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), 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)-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), 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), and SCOAP

Subjects
Nuclear and High Energy Physics, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Nuclear physics, ESPECTROSCOPÍA, 0103 physical sciences, Nuclear Physics - Experiment, Beta (velocity), Nuclear Experiment (nucl-ex), 010306 general physics, FÍSICA NUCLEAR, Nuclear Experiment, Physics, ta114, Isotope, 010308 nuclear & particles physics, Isotopes of chlorine, Isotopes of argon, SPECTROSCOPIC, Beta decay, lcsh:QC1-999, DESINTEGRATION, 3. Good health, Física nuclear, High Energy Physics::Experiment, Atomic physics, EMISSION, lcsh:Physics, FÍSICA, Energy (signal processing), Excitation, Radioactive decay
Abstract

5 pags. ; 7 figs. ; Open Access funded by SCOAP3 - Sponsoring Consortium for Open Access Publishing in Particle Physics, © 2014 The Authors. We present for the first time precise spectroscopic information on the recently discovered decay mode β-delayed 3p-emission. The detection of the 3p events gives an increased sensitivity to the high energy part of the Gamow-Teller strength distribution from the decay of 31Ar revealing that as much as 30% of the strength resides in the β3p-decay mode. A simplified description of how the main decay modes evolve as the excitation energy increases in 31Cl is provided., This work was supported by the European Union Seventh Framework through ENSAR (Contract No. 262010), it was partly supported by the Spanish Funding Agency under Projects No. FPA2012-32443, No. FPA2010-17142, CPAN ConsoliderCSD-2007-00042, and No. AIC-D-2011-0684.

Published
2014
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39. The delayed proton emission in the –77 mass region, statistical aspects and structure effects

Author

Ph. Dessagne, J. Giovinazzo, and Ch. Miehé

Subjects
Physics, Nuclear and High Energy Physics, Series (mathematics), Proton, Nuclear Theory, Structure (category theory), Nuclear structure, Statistical model, Stability (probability), Nuclear physics, Statistical analysis, Atomic physics, Proton emission, Nuclear Experiment
Abstract

In the decay of the series of T Z =1/2 nuclei, 65 Ge, 69 Se, 73 Kr and 77 Sr, a statistical analysis was applied to the β delayed proton emission to obtain nuclear structure information. New results emerge from this study, in the light of improvements in the experimental techniques and developments of the analysis method. Experimental results are analysed by comparison with a statistical model, in order to extract information on level densities and partial transition widths of the proton emitting nuclei. Limitations of the existing descriptions of processes for nuclei far from stability are pointed out.

Published
2000
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40. Observation of Fermi Superallowedβ+Decays in Heavy Odd-Odd,N=ZNuclei: Evidence for0+Ground States inY78,N82b, andT86c

Author

Ph. Dessagne, L. Frankland, J. Giovinazzo, Robert Grzywacz, Leif Axelsson, R. M. Clark, C. Longour, A. Fleury, B. Blank, W. Gelletly, P. H. Regan, M. Lewitowicz, C. J. Pearson, D. M. Cullen, R. Wadsworth, W. N. Catford, J. M. Daugas, K. L. Jones, O. Sorlin, D. Applebe, Ch. Miehé, B. J. Greenhalgh, J. Garcés Narro, C. Chandler, R. D. Page, Marie K. Harder, A.T. Reed, Alison Bruce, S. Czajkowski, N. S. Kelsall, and T. Kszczot

Subjects
Physics, Nuclear physics, Particle physics, General Physics and Astronomy, Beta (velocity), Fermi Gamma-ray Space Telescope
Published
1998
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41. High-precision half-life and branching-ratio measurements for superallowed Fermi + emitters at TRIUMF - ISAC

Author

S. Triambak, A. B. Garnsworthy, Chandana Sumithrarachchi, J. Giovinazzo, Steffen Ketelhut, B. Blank, S. Chagnon-Lessard, D. Bandyopadhyay, G. Hackman, J. Wong, A. A. Phillips, A. Diaz Varela, Corina Andreoiu, E. T. Rand, I. S. Towner, D. S. Jamieson, G. C. Ball, S. J. Williams, G. F. Grinyer, G. A. Demand, M. Djongolov, C. J. Pearson, K. G. Leach, J. R. Leslie, E. F. Zganjar, D. S. Cross, C. E. Svensson, R. Dunlop, A. T. Laffoley, H. Bouzomita, C. Unsworth, K. L. Green, R. A. E. Austin, J. C. Thomas, J. Glister, A. Chester, S. W. Yates, S. Ettenauer, Baharak Hadinia, P. E. Garrett, K. Starosta, E. R. Tardiff, P. Finlay, Department of Physics [Guelph], University of Guelph, Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Department of Astronomy and Physics [Halifax], Saint Mary's University [Halifax], TRIUMF [Vancouver], Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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)-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), 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), and 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)-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)

Subjects
Physics, Ion beam, Isotope, half-life, Branching fraction, QC1-999, Half-life, Superallowed Fermi β decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Standard Model, Nuclear physics, Isospin, Physics::Accelerator Physics, Symmetry breaking, branching ratio, Nuclear Experiment, 26Alm, Fermi Gamma-ray Space Telescope
Abstract

International audience; A program of high-precision half-life and branching-ratio measurements for superallowed Fermi emitters is being carried out at TRIUMF's Isotope Separator and Accelerator (ISAC) radioactive ion beam facility. Recent half-life measurements for the superallowed decays of 14O, 18Ne, and 26Alm, as well as branching-ratio measurements for 26Alm and 74Rb are reported. These results provide demanding tests of the Standard Model and the theoretical isospin symmetry breaking (ISB) corrections in superallowed Fermi decays.

Published
2013
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42. β Decay in the Region of Neutron-deficient $^{69,70,71}$Kr

Author

Jason A. Clark, S. Gros, G. Canchel, S. Grévy, E. A. McCutchan, C. J. Lister, J. C. Thomas, Guy Savard, A. M. Rogers, D. Seweryniak, F. de Oliveira Santos, J. Giovinazzo, B. Blank, I. Stefan, Noyaux exotiques (NEX), 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)-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), 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), 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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Krypton, chemistry.chemical_element, Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, chemistry, Isospin, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Ground state, Spectroscopy
Abstract

Expérience GANIL/LISE3; International audience; Decay spectroscopy was performed for neutron-deficient nuclei ranging from zinc to krypton with isospin View the MathML source−32≤Tz≤0. Measurements of correlated β -delayed protons allowed us to determine the isobaric analog states fed from the decay of 65Se and 69Kr, constraining the spin of the 69Kr ground state. Preliminary results regarding the half lives for the Tz=−1Tz=−1 systems, relevant to the rapid proton capture (rp) process, are discussed.

Published
2013
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43. Two-proton radioactivity: 10 years of experimental progresses

Author

G. Canchel, J. Pibernat, L. Perrot, C. Dossat, L. Serani, J.-L. Pedroza, S. Leblanc, C. Stodel, L. Audirac, C.-E. Demonchy, C. Borcea, B. Blank, P. Ascher, S Grvy, F. De Oliveira-Santos, J. C. Thomas, I Matea, J. Giovinazzo, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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)-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), INSTRU, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), ELEC, 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)-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), 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 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)

Subjects
Physics, History, Proton, Field (physics), 010308 nuclear & particles physics, Direct observation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Tracking (particle physics), 01 natural sciences, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, Silicon detector, Physics::Accelerator Physics, 010306 general physics, Nuclear Experiment, Projectile fragmentation
Abstract

International audience; The two-proton radioactivity has been observed experimentally in 2002, at projectile fragmentation facilities, more than 40 years after the rst theoretical prediction of this process. First observations were indirect measurements, using standard silicon detector devices. Since then, a new generation of experiments allowed for a direct observation, and opened the eld of more detailed studies, using tracking devices for the detection of the emitted protons.

Published
2013
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44. Direct and β-delayed multi-proton emission from atomic nuclei with a time projection chamber: the cases of $^{43}$Cr, $^{45} $Fe, and $^{51}$Ni

Author

J. Pibernat, J. Giovinazzo, I. Matea, L. Perrot, S. Grévy, J. L. Pedroza, F. de Oliveira Santos, S. Leblanc, L. Audirac, J. Huikari, B. Blank, P. Ascher, L. Serani, L. Hay, C. Borcea, C. Stodel, B. A. Brown, J. C. Thomas, G. Canchel, C. Dossat, C. E. Demonchy, Noyaux exotiques (NEX), 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)-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), RAEN, INSTRU, 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), 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), ELEC, 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)-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), 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), 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
Physics, Nuclear and High Energy Physics, Time projection chamber, Proton, 010308 nuclear & particles physics, Hadron, Theoretical models, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Atomic nucleus, Physics::Accelerator Physics, Nuclear fusion, Atomic physics, Proton emission, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

Expérience GANIL/LISE3; The two-proton radioactivity of 45Fe was studied experimentally with a time projection chamber. The aim of the experiment was the reconstruction of the proton tracks in three dimensions. Energy and angular correlations have been determined and the data are compared with theoretical models, in particular with a three-body model. Moreover, the decay of 43Cr was studied and β-delayed one-, two- and threeproton emission could be established. The correlations observed for β-delayed two-proton emission favour a sequential emission. Finally, β-delayed two-proton emission was observed for the first time for 51Ni.

Published
2012
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45. Beta decay of exotic T[sub Z] = −1 and T[sub Z] = −2 nuclei

Author

B. Bilgier, B. Blank, B. Rubio, H. Fujita, R. B. Cakirli, Yoshitaka Fujita, A. Algora, E. Ganioglu, G. Susoy, J. C. Thomas, J. Giovinazzo, F. Molina, C. Stodel, Lucia Popescu, L. Kucuk, A. M. Rogers, Atsushi Tamii, S. Grévy, T. Kurtukian-Nieto, M. Gerbaux, S. E. A. Orrigo, O. Kamalou, P. Ascher, W. Gelletly, H. C. Kozer, L. Caceres, Jorge Agramunt, and Toshio Suzuki

Subjects
Physics, Nuclear physics, Isotope, 010308 nuclear & particles physics, 0103 physical sciences, Beta (velocity), 010306 general physics, 7. Clean energy, 01 natural sciences, Beta decay, Charge exchange
Abstract

The half-lives of the Tz = -2, 56Zn and Tz = -1, 58Zn isotopes and other nuclei were measured in a {\beta}-decay experiment at GANIL. The energy levels populated by the 56Zn {\beta} decay were determined. The 56Zn results are compared with the results of the mirror process, the charge exchange reaction 56Fe(3He,t)56Co.

Published
2012
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46. β-decay measurements forN>40Mn nuclei and inference of collectivity for neutron-rich Fe isotopes

Author

C. R. Bingham, F. Becker, F. de Oliveira Santos, Georgi P. Georgiev, I. Matea, O. Roig, Ch. Stodel, H. Grawe, Robert Grzywacz, M. Lewitowicz, M. Sawicka, J. Giovinazzo, G. Belier, E. Bouchez, E. Dragulescu, D. Verney, F. Ibrahim, J. Libert, M. Pfützner, M. Stanoiu, K. P. Rykaczewski, P. Mayet, J. P. Delaroche, O. Perru, F. Hammache, V. Méot, A. Buta, J. E. Sauvestre, Ch. Theisen, J. Żylicz, Michel Girod, R. Borcea, O. Sorlin, I. Stefan, F. Negoita, M. G. Saint-Laurent, and J. M. Daugas

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Branching fraction, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutron number, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Delayed neutron, Radioactive decay
Abstract

A decay spectroscopic study of the neutron-rich isotopes has been performed using fragmentation of a 86Kr primary beam. Fragments from this reaction have been selected by the LISE2000 spectrometer at the Grand Acc el erateur National d Ions Lourds (GANIL). Half-lives of 29 isotopes, including the first ones identified for 61Ti (15 4 ms), 64V (19 8 ms), and 71Fe (28 5 ms), have been determined and compared with model predictions. 67,68Mn -delayed rays were observed for the first time. The branching for the -delayed neutron emission was measured to be greater than 10(5)% in the 67Mn decay. The 67Fe isomeric level is firmly determined at higher energy than assigned in previous works. The excitation energies of the first (2+) and (4+) states of 68Fe are suggested to lie at 522(1) and 1389(1) keV, respectively, thus bringing confirmation of assignments based on in-beam -ray spectroscopy. Beyond-mean-field calculations with the Gogny D1S force have been performed for even-mass nuclei through the Fe isotopic chain. Not only 68Fe but most of the neutron-rich Fe isotopes with neutron numbers below N = 50 are interpreted as soft rotors. The calculated mean occupancy of the neutron g9/2 and d5/2 orbitals in correlated ground statesmore » is steadily growing with increasing neutron number throughout the isotopic chain. Interpretation of 67Fe data is based upon the present calculations for the 66Fe and 68Fe even cores.« less

Published
2011
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47. Precision half-life and Q -value measurement of the super-allowed b emitter 30S

Author

J. Giovinazzo, S. Rahaman, J. Souin, B. Blank, Antti Saastamoinen, Iain Moore, Juha Äystö, Veli Kolhinen, P. Ascher, Juho Rissanen, V.-V. Elomaa, Tommi Eronen, Pasi Karvonen, Ari Jokinen, L. Audirac, Jani Hakala, J. C. Thomas, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Q value, Hadron, Value (computer science), Half-life, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, 0103 physical sciences, Nuclear fusion, Relative precision, Atomic physics, 010306 general physics
Abstract

The b \beta -decay half-life and the ground-state-to-ground-state Q EC -value of 30S were measured with a relative precision of 14 and 2 parts in 104, respectively. The half-life measurement yields a value of 1175.9(17)ms which is in agreement with previous measurements but has a precision that is better by a factor of three. The new super-allowed Q EC -value 5464.32(20)keV is 20 times more precise and slightly larger than the previously adopted value. The experiment was performed at the IGISOL facility at the Accelerator Laboratory of the University of Jyväskylä., This work was supported in part by the Conseil Regional d’Aquitaine. We also acknowledge support from the Academy of Finland under the Finnish Center of Excellence Programme 2006-2011 (Project No. 213503, Nuclear and Accelerator Based Physics Programme at JYFL).

Published
2011
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48. β-delayed emission of protons at the proton drip-line: the cases of [sup 43]Cr and [sup 51]Ni

Author

L. Audirac, N. Adimi, P. Ascher, B. Blank, C. Borcea, G. Canchel, C. E. Demonchy, I. Companis, F. Delalee, F. de Oliveira Santos, C. Dossat, J. Giovinazzo, S. Grévy, L. Hay, J. Huikari, T. Kurtukian-Nieto, S. Leblanc, I. Matea, J.-L. Pedroza, L. Perrot, J. Pibernat, L. Serani, C. Stodel, P. Strivatava, J.-C. Thomas, Bertram Blank, 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), 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), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, B. Blank, 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), 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), 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
Physics, Time projection chamber, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, 23.40.-s, 23.50.+z, 27.40.+z, 29.40.Cs, 29.40.Gx, beta-delayed emission of protons, Ionization, Time Projection Chamber, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, 020201 artificial intelligence & image processing, Atomic physics, Nuclear Experiment, Exotic nuclei, Line (formation)
Abstract

International audience; Studies of -delayed emission of protons for 43Cr and 51Ni were performed with a Time Projection Chamber. This detection setup allows to reconstruct in the three-dimensional space the tracks of the protons emitted. For the first time, -delayed emission of two protons is directly observed for 43Cr and 51Ni. The question about correlations between protons can be accessed. Finally, we show that 43Cr can emit up to three delayed protons.

Published
2011
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49. Approaching r-process nuclei at N=126

Author

B. Jurado, K.-H. Schmidt, A. I. Morales, B. Blank, Enrique Casarejos, J. Giovinazzo, F. Rejmund, L Langanke, L. Audouin, F. Becker, Daniela Henzlova, O. Yordanov, J. Pereira, Ivan Borzov, J. Benlliure, H. Alvarez-Pol, P. Napolitani, B. Fernández, D. Cortina-Gil, T. Kurtukian-Nieto, Gabriel Martínez-Pinedo, 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), Noyaux exotiques (NEX), 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)-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), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), 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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, History, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, 25.75.-q, 27.90.+b, 95.30.Cq, 25.70.Mn, 27.60.+j, r-process, Nuclide, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

International audience; The production of heavy neutron-rich nuclei approaching the r-process waiting point at N$\approx$126 has been investigated in fragmentation reactions of relativistic 238U and 208Pb projectiles. Using this technique we were able to identify 73 new heavy neutron-rich nuclei expanding considerably the north-west frontier of the chart of nuclide. Moreover, we were able to determine the half lives of 13 of those nuclides. The measured values are significantly shorter than the predictions used for r-process model calculations. These shorter half lives are understood as due to the role of first-forbidden transitions in the decays of these nuclei. The confirmation of these results for r-process nuclei at N$\approx$126 would indicate that the r-process at this point is faster than expected, leading to a larger production of the heaviest nuclei.

Published
2011
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50. The Spectroscopic study of [sup 33]Ar

Author

N. Adimi, R. Dominguez-Reyes, M. Alcorta, A. Bey, B. Blank, M. J. G. Borge, F. de Oliveira Santos, C. Dossat, H. O. U. Fynbo, J. Giovinazzo, H. H. Knudsen, M. Madurga, I. Matea, A. Perea, K. Sümmerer, O. Tengblad, J. C. Thomas, Paraskevi Demetriou, Rauno Julin, and Sotirios Harissopulos

Subjects
Physics, Decay scheme, Proton, Nuclear Theory, Nuclear structure, 020206 networking & telecommunications, 02 engineering and technology, 7. Clean energy, Beta decay, Spectral line, Nuclear physics, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Gamma spectroscopy, Atomic physics, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

The proton‐rich nucleus 33Ar has been produced at the low‐energy facility SPIRAL at GANIL. Spectroscopic studies of gamma and p emission of this nucleus were performed with the “Silicon Cube” detection system. The analysis of proton and gamma singles and coincidence spectra allowed us to establish a complete decay scheme of this nucleus. The comparison of the Gamow‐Teller strength distribution deduced from our experiment and the theoretical one obtained with the Shell Model permitted the determination of a quenching factor for the Gamow‐Teller strength.

Published
2011
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