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1. Tracking with the MINOS Time Projection Chamber

Author

Masaki Sasano, A. Giganon, C. S. Lee, D. Calvet, C. Santamaria, A. Gillibert, T. Motobayashi, Yuya Kubota, E. Takada, H. N. Liu, F. Château, E. C. Pollacco, Yosuke Kondo, P. Doornenbal, Hideaki Otsu, V. Lapoux, A. Obertelli, M. Kurata-Nishimura, D. Leboeuf, L. Audirac, Juzo Zenihiro, Hidetada Baba, Masafumi Matsushita, G. Prono, Shuichi Ota, Alan Peyaud, A. Corsi, C. Lahonde-Hamdoun, Megumi Niikura, Tomohiro Uesaka, A. Delbart, Hiroshi Tokieda, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, Vertex (computer graphics), Physics::Instrumentation and Detectors, vertex detector, Tracking software, Tracking (particle physics), 7. Clean energy, 01 natural sciences, programming, Nuclear physics, benchmark, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Spectroscopy, numerical calculations, Instrumentation, spatial resolution, Physics, MINOS, Time projection chamber, 010308 nuclear & particles physics, Scattering, track data analysis, time projection chamber, Full width at half maximum, Hough transform, efficiency, Spectroscopy of exotic nuclei, Physics::Accelerator Physics, Nucleon, performance
Abstract

We report on the performance of the MINOS Time Projection Chamber developed as a vertex tracker to study exotic nuclei produced from hydrogen-induced knockout via in-beam γ -ray and invariant-mass spectroscopy . In-beam measurements with 4 He and 20Ne beams at 200 and 350 MeV/nucleon, respectively, were performed at the HIMAC facility. The tracking algorithm for protons after quasi-free scattering is described. Realistic simulations and physics experiments are compared and show a good agreement. The vertex position resolution reaches 5 mm FWHM, mostly from re-scattering with the target and the Aluminum reaction chamber. The overall efficiency of vertex reconstruction is also benchmarked with the first experimental campaign data performed at the RIBF, confirming an overall efficiency better than 90% for physics experiments.

Published
2018
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2. High-precision efficiency calibration of a high-purity co-axial germanium detector

Author

T. Kurtukian Nieto, J. Giovinazzo, J. Souin, H. Guérin, B. Blank, J. C. Thomas, I. Matea, G. Canchel, G. F. Grinyer, M. Gerbaux, L. Audirac, S. Grévy, H. Bouzomita, P. Ascher, P. Delahaye, 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), 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)-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 and High Energy Physics, Physics - Instrumentation and Detectors, Monte Carlo method, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Crystal, Optics, Calibration, Gamma spectroscopy, Gamma-ray spectroscopy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Physics, Monte-Carlosimulations, business.industry, Detector, Germanium detector, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, Super-allowed beta transitions, High Energy Physics::Experiment, Coaxial, business, Energy (signal processing)
Abstract

Expérience GANIL; International audience; A high-purity co-axial germanium detector has been calibrated in efficiency to a precision of about 0.15% over a wide energy range. High-precision scans of the detector crystal and gamma-ray source measurements have been compared to Monte-Carlo simulations to adjust the dimensions of a detector model. For this purpose, standard calibration sources and short-lived on-line sources have been used. The resulting efficiency calibration reaches the precision needed e.g. for branching ratio measurements of super-allowed beta decays for tests of the weak-interaction standard model.

Published
2015
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3. 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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4. Intermediate-energy Coulomb excitation ofSn104: ModerateE2strength decrease approachingSn100

Author

K. Matsui, Andrea Corsi, V. Lapoux, D. Sohler, Yoshiaki Shiga, L. Audirac, Satoshi Takeuchi, Tadaaki Isobe, Jongmin Lee, A. Jungclaus, Hidetada Baba, S. Boissinot, Shuichi Ota, Hiroyoshi Sakurai, T. Motobayashi, Takenori Furumoto, Nori Aoi, Ryo Taniuchi, E. C. Pollacco, Hua-Lei Wang, M. Ciemala, Masafumi Matsushita, Daiki Nishimura, A. Obertelli, C. Santamaria, P. Bednarczyk, David Steppenbeck, and P. Doornenbal

Subjects
Physics, Nuclear and High Energy Physics, Intermediate energy, 010308 nuclear & particles physics, 0103 physical sciences, SHELL model, Coulomb excitation, Atomic physics, 010306 general physics, 01 natural sciences
Abstract

P. Doornenbal, et al. ; 6 pags. ; 4 figs. ; 1 tab. ; PACS number(s): 21.60.Cs, 23.20.Js, 25.70.De, 27.60.+j

Published
2014
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5. MINOS: A vertex tracker coupled to a thick liquid-hydrogen target for in-beam spectroscopy of exotic nuclei

Author

Hidetada Baba, C. Péron, G. Authelet, C. Lahonde-Hamdoun, J. M. Gheller, L. Audirac, Tomohiro Uesaka, D. Leboeuf, D. Calvet, Alan Peyaud, A. Mohamed, B. Bruyneel, J.-Y. Roussé, A. Giganon, C. Santamaria, A. Corsi, Alexandre Obertelli, F. Château, D. Loiseau, A. Delbart, E. C. Pollacco, Hideaki Otsu, S. Anvar, P. Doornenbal, J. Ph. Mols, G. Prono, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), and Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP)

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Luminosity (scattering theory), 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle detector, Nuclear physics, MINOS, 0103 physical sciences, Nuclear fusion, Gamma spectroscopy, Atomic physics, 010306 general physics, Nucleon, Spectroscopy
Abstract

International audience; MINOS is a new apparatus dedicated to in-beam nuclear structure experiments with lowintensityexotic beams in inverse kinematics at intermediate energies above 150MeV/nucleon. The deviceis composed of a thick liquid-hydrogen target coupled to a compact time projection chamber (TPC) servingas a vertex tracker. Either used for in-beam gamma spectroscopy of bound excited states or invariant-massspectroscopy of unbound states, MINOS aims at improving the luminosity by a very significant factorcompared to standard solid-target material experiments while improving experimental resolutions.

Published
2014
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6. Evaporation-cost dependence in heavy-ion fragmentation

Author

Tadaaki Isobe, A. Jungclaus, Sylvie Leray, L. Audirac, K. Matsui, David Steppenbeck, Ryo Taniuchi, Hidetada Baba, S. Boissinot, Davide Mancusi, Pieter Doornenbal, Nori Aoi, A. Gillibert, Yoshiaki Shiga, A. Corsi, He Wang, A. Boudard, Jenny Lee, C. Santamaria, Satoshi Takeuchi, E. C. Pollacco, D. Nishimura, Masafumi Matsushita, Dóra Sohler, Hiroyoshi Sakurai, A. Obertelli, Shinsuke Ota, Gregory Potel, V. Lapoux, and Tohru Motobayashi

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), [PACS] Interaction and reaction cross-sections, Nuclear Theory, Heavy ion, [PACS] Projectile and target fragmentation, Nuclear Experiment
Abstract

Inclusive multineutron and multiproton removal cross sections from 112Sn and 104Sn at relativistic energies have been measured. The data show two distinct regimes of the reaction process that depend on the nucleon evaporation cost of the final nucleus. This behavior is universal by regarding the mass or asymmetry of the initial system or target composition. A state-of-the-art cascade and deexcitation model reproduces the observed trend but systematically fails in reproducing cross sections for the removal of the more bound nucleon species. © 2013 American Physical Society., A. Jungclaus acknowledges support from the Spanish Ministerio de Ciencia e Innovacion under Contracts No. FPA2009-13377-C02-02 and No. FPA2011-29854-C04-01.

Published
2013

7. 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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8. Two-proton radioactivity, a new probe for structure at the proton drip-line

Author

G. Canchel, J. Pibernat, J. Giovinazzo, S. Leblanc, P. Ascher, L. Audirac, L. Serani, B. Blank, C. Borcea, F. De Oliveira-Santos, L. Perrot, J. C. Thomas, J.-L. Pedroza, C.-E. Demonchy, S. Grévy, C. Dossat, I. Matea, C. Stodel, 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, ELEC, 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 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), 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), 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 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, Decay scheme, Proton, Theoretical models, Nuclear structure, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, Nuclear Experiment, Decay correct, Line (formation)
Abstract

International audience; The two-proton radioactivity has been evidenced experimentally in 2002 in the ground-state decay of 45Fe, while this new decay mode was predicted since the 60's. The first observations have been done indirectly, from various global quantities measured in the decay process (half-file, Q-value, daughter decay,...). Since then, new devices have been developed in order to perform energy and angular measurements of the emitted particles. The comparison of full experimental observations with theoretical models opens a new access to nuclear structure a the drip-line.

Published
2012
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9. 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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10. Precision half-life determination of a mirror β transition: The decay of 31S

Author

Jani Hakala, J. Giovinazzo, L. Audirac, B. Blank, Juha Äystö, Saidur Rahaman, P. Ascher, M. Reponen, V.-V. Elomaa, Juho Rissanen, Tommi Eronen, Iain Moore, Anu Kankainen, Veli Kolhinen, A. Bacquias, Antti Saastamoinen, Pasi Karvonen, J. Souin, T. Kurtukian-Nieto, Ari Jokinen, Noyaux exotiques (NEX), 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)-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, 0103 physical sciences, Hadron, Half-life, Beta (velocity), Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

The half-life of the mirror \(\beta\) decay of 31S has been measured at the IGISOL facility at the University of Jyvaskyla. The value obtained is \(T_{1/2}(^{31}S)=(2553.4\pm 1.8)\) ms, in agreement with previous measurements, but with a precision that is better by a factor of ten than the literature value previously adopted. When the new result is combined with the QEC value measured recently at JYFLTRAP, a precision of better than \(10^{-3}\) is obtained for the ft value.

Published
2012
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11. 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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12. Two-Proton Radioactivity as a Tool for Nuclear Structure

Author

S. Leblanc, F. de Oliveira Santos, I. Matea, T. Kurtukian-Nieto, L. Perrot, B. Blank, Carole Dossat, G. Canchel, L. V. Grigorenko, P. Ascher, I. Companis, L. Serani, F. Delalee, L. Audirac, C. Borcea, C. Stodel, Praveen C. Srivastava, J. Huikari, S. Grévy, J. Pibernat, J. C. Thomas, B. A. Brown, C. E. Demonchy, N. Adimi, J. L. Pedroza, L. Hay, 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), MECA, 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, ELEC, 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), H. Otsu, T. Motobayashi, P. Roussel-Chomaz, T. Otsuka, 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 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
Materials science, Time projection chamber, Proton, Radiochemistry, Nuclear structure, two-proton radioactivity, time-projection chamber, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS, Exotic nuclei
Abstract

International audience

Published
2011
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13. 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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14. Direct observation of two protons in the decay of $^{54}$Zn

Author

F. Delalee, N. Adimi, J. L. Pedroza, L. V. Grigorenko, B. A. Brown, P. Ascher, F. de Oliveira Santos, B. Blank, L. Serani, C. Borcea, J. Pibernat, S. Leblanc, J. C. Thomas, S. Grévy, J. Giovinazzo, C. E. Demonchy, T. Kurtukian-Nieto, Praveen C. Srivastava, L. Perrot, I. Companis, L. Audirac, 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, 23.50.+z, 27.40.+z, 29.40.Cs, 29.40.Gx, 010308 nuclear & particles physics, Branching fraction, Hadron, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Baryon, Decay energy, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Nucleon, Nuclear Experiment, Energy (signal processing), Radioactive decay
Abstract

Accepted for publication in Physical Review Letters, Expérience au GANIL E457b (juillet 2008), LISE3 Commune au CENBG avec ACEN, MECA, INSTRU et ELEC; The two protons emitted in the decay of 54Zn have been individually observed for the rst time in a Time Projection Chamber. The total decay energy and the half-life measured in this work agree with the results obtained in a previous experiment. Angular and energy correlations between the two protons are determined and compared to theoretical distributions of a three-body model. Within the shell model framework, the relative decay probabilities show a strong contribution of the p2 con guration for the two-proton emission. After 45Fe, the present result on 54Zn constitutes only the second case of a direct observation of the ground state two-proton decay of a long-lived isotope.

Published
2011
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15. Experimental studies of an exotic decay mode at the proton drip‐line: the two‐proton radioactivity

Author

L. Audirac, N. Adimi, P. Ascher, B. Blank, B. A. Brown, C. Borcea, G. Canchel, I. Companis, F. Delalee, C. E. Demonchy, F. de Oliveira Santos, C. Dossat, J. Giovinazzo, S. Grévy, L. V. Grigorenko, L. Hay, J. Huikari, T. Kurtukian-Nieto, S. Leblanc, I. Matea, J.-L. Pedroza, L. Perrot, J. Pibernat, L. Serani, C. Stodel, P. Strivastava, J.-C. Thomas, Paraskevi Demetriou, Rauno Julin, Sotirios Harissopulos, 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), P. Demetriou, R. Julin, S. Harissopulos, 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, Isotope, Proton, Nuclear Theory, Hadron, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Particle detector, Nuclear physics, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, 020201 artificial intelligence & image processing, Atomic physics, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

Two‐proton radioactivity is an exotic decay mode for very proton‐rich nuclei. It was observed experimentally for the first time in 2002 for the nucleus 45Fe but the two protons could not be directly detected. So a new detector has been developed, a Time Projection Chamber, to individually observe the two protons emitted. It was used successfully during two experiments for the study of 45Fe and 54Zn. Energy correlations have been studied and the relative angle between the two protons is calculated.

Published
2010
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16. A time projection chamber for the three-dimensional reconstruction of two-proton radioactivity events

Author

J. Giovinazzo, R. De Oliveira, P. Hellmuth, J. L. Pedroza, J. C. Thomas, I. Matea, S. List, C. Borcea, G. Canchel, L. Hay, P. Ascher, L. Serani, C. E. Demonchy, S. Leblanc, J. Huikari, C. Dossat, B. Blank, C. Marchand, A. Rebii, L. Audirac, F. Delalee, J. Pibernat, 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), National Institute for Physics and Nuclear Engineering (NIPNE), National Institute for Physics and Nuclear Engineering, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), European Organization for Nuclear Research (CERN), 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), 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 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, Time projection chamber, Proton, 010308 nuclear & particles physics, Nuclear Theory, Context (language use), Two-proton radioactivity, 01 natural sciences, Nuclear physics, 0103 physical sciences, 29.40.Cs, 29.30.Ep, 29.90.+r, Physics::Accelerator Physics, ASIC electronics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

Publication commune avec MECA, INSTRU et ELEC (CENBG), Expérience GANIL LISE2000 et LISE-D6 : E457a; Two-proton radioactivity was observed in 2002 in the decay of 45Fe. However, the experiments performed at that time did not allow the observation of the two protons directly. We present here a new setup based on the principle of a time-projection chamber that enabled us for the first time to identify directly the two protons. The new setup permits the observation and reconstruction in three dimensions of the traces of the protons and to determine thus their individual energies and their relative angle. We will discuss the setup in all necessary details and describe its performances in the context of two-proton radioactivity and β-delayed two-proton emission studies.

Published
2010
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17. Half-life, branching-ratio, andQ-value measurement for the superallowed0+→0+β+emitterTi42

Author

Antti Saastamoinen, T. Kessler, Pasi Karvonen, Ulrike Hager, Heikki Penttilä, Juha Äystö, Sami Rinta-Antila, B. Blank, Saidur Rahaman, T. Sonoda, Juho Rissanen, J. Giovinazzo, Tommi Eronen, L. Audirac, V.-V. Elomaa, Ari Jokinen, M. Reponen, Iain Moore, Anu Kankainen, J. Souin, T. Kurtukian Nieto, Jani Hakala, and Christine Weber

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Q value, Branching fraction, 0103 physical sciences, Half-life, Atomic physics, 010306 general physics, 01 natural sciences, Common emitter
Abstract

The half-life, the branching ratio, and the decay $Q$ value of the superallowed $\ensuremath{\beta}$ emitter $^{42}\mathrm{Ti}$ were measured in an experiment performed at the JYFLTRAP facility of the Accelerator Laboratory of the University of Jyv\"askyl\"a. $^{42}\mathrm{Ti}$ is the heaviest ${T}_{z}=\ensuremath{-}1$ nucleus for which high-precision measurements of these quantities have been tried. The half-life (${T}_{1/2}=208.14\ifmmode\pm\else\textpm\fi{}0.45$ ms) and the $Q$ value [${Q}_{\mathrm{EC}}=7016.83(25)$ keV] are close to or reach the required precision of about 0.1%. The branching ratio for the superallowed decay branch [$\mathrm{BR}=47.7(12)%$], a by-product of the half-life measurement, does not reach the necessary precision yet. Nonetheless, these results allow one to determine the experimental $\mathit{ft}$ value and the corrected $\mathcal{F}t$ value to be 3114(79) and 3122(79) s, respectively.

Published
2009
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18. A time projection chamber to study two-proton radioactivity

Author

J. Huikari, J. L. Pedroza, L. Perrot, C. E. Demonchy, F. de Oliveira Santos, J. Giovinazzo, P. Hellmuth, A. Rebii, G. Canchel, R. De Oliveira, L. Audirac, B. Blank, S. Leblanc, C. Borcea, Carole Dossat, C. Stodel, S. Grévy, C. Marchand, J. C. Thomas, I. Matea, F. Delalee, L. Serani, J. Pibernat, L. Hay, S. List, 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), 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), M. Lion, W. Mittig, O. Navilliat-Cuncic, P. Roussel-Chomaz, A.C.C. Villari, 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 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, Time projection chamber, Proton, 010308 nuclear & particles physics, Two-proton radioactivity, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, 29.40.Cs, 29.30.Ep, 29.90.+r, Physics::Accelerator Physics, ASIC electronics, Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

Commune avec MECA, INSTRU et ELEC; International audience; Two-proton radioactivity was observed in two experiments in 2002 in the decay of 45Fe. However, these experiments did not allow the observation of the two protons directly. In the present paper, we present a new setup based on the principle of a time projection chamber which enabled us for the first time to identify directly the two protons. The new setup permits the observation and reconstruction in three dimensions of the traces of the protons. We will discuss the setup and describe its performances.

Published
2007
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19. Observation of individual particles in the two-proton radioactivity with a time projection chamber

Author

J. Giovinazzo, B. Blank, L. Audirac, C. Borcea, G. Canchel, C. E. Demonchy, F. de Oliveira Santos, C. Dossat, S. Grévy, L. Hay, J. Huikari, S. Leblanc, I. Matea, J.-L. Pedroza, L. Perrot, J. Pibernat, L. Serani, C. Stodel, J.-C. Thomas, Lídia S. Ferreira, Paramasivan Arumugan, 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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, Time projection chamber, Proton, Nuclear Theory, Nuclear structure, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, Angular correlation, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, Particle, 020201 artificial intelligence & image processing, Atomic physics, Nuclear Experiment, Projectile fragmentation, Energy (signal processing)
Abstract

Commune avec INSTRU et ELEC; International audience; Two decay modes were predicted for nuclei at the proton drip-line by Goldanskii[ in the early 60's: the 1-proton radioactivity for odd-Z nuclei and the 2-proton radioactivity for even-Z nuclei. The first one was discovered experimentally in the 80's, while the 2-proton decay was observedfor the first time in 2002 in the decay of 45Fe at GANIL and GSI. This was confirmed by a recent GANIL experiment, that also stated 54Zn as a precursor of this decay model. This new radioactivity may provide many experimental pieces of information about masses for nuclei beyond the drip-line, single particle levels sequence, tunnelling processes or the pairing interaction. The challenging goal for experimental two-proton studies is then to perform a more extensive analysis of the decay process by measuring energy and angular correlations between the two emitted particles. This should allow for a comparison with models taking into account the structure of involved nuclei and the decay mechanism. For this purpose, a Time Projection Chamber detector has been developed at CENBG. It has been used successfully in an experiment performed at GANIL in September 2006, leading to the first direct observation of individual protons emitted in the decay of 45Fe. The experimental set-up and the first results of this experiment will be presented.

Published
2007
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20. Direct observation of two protons in the decay of 54Zn.

Author

Ascher P, Audirac L, Adimi N, Blank B, Borcea C, Brown BA, Companis I, Delalee F, Demonchy CE, de Oliveira Santos F, Giovinazzo J, Grévy S, Grigorenko LV, Kurtukian-Nieto T, Leblanc S, Pedroza JL, Perrot L, Pibernat J, Serani L, Srivastava PC, and Thomas JC

Abstract

The two protons emitted in the decay of 54Zn have been individually observed for the first time in a time projection chamber. The total decay energy and the half-life measured in this work agree with the results obtained in a previous experiment. Angular and energy correlations between the two protons are determined and compared to theoretical distributions of a three-body model. Within the shell model framework, the relative decay probabilities show a strong contribution of the p2 configuration for the two-proton emission. After 45Fe, the present result on 54Zn constitutes only the second case of a direct observation of the ground state two-proton decay of a long-lived isotope.

Published
2011
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