203 results on '"J, Giovinazzo"'
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2. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry
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A. Vitéz-Sveiczer, A. Algora, A.I. Morales, B. Rubio, G.G. Kiss, P. Sarriguren, P. Van Isacker, G. de Angelis, F. Recchia, S. Nishimura, J. Agramunt, V. Guadilla, A. Montaner-Pizá, S.E.A. Orrigo, A. Horváth, D. Napoli, S. Lenzi, A. Boso, V.H. Phong, J. Wu, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, D.S. Ahn, H. Baba, P. Doornebal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono, H. Sakurai, Y. Shimizu, C. Sidong, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grévy, T. Kurtukián Nieto, C. Magron, W. Gelletly, Zs. Dombrádi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diel, D. Lubos, C. Borcea, E. Ganioglu, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I. Kojouharov, N. Kurz, H. Shaffner, and A. Petrovici
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Beta decay of 70Kr ,pn pairing ,GT strength distribution ,Pseudo-SU(4) symmetry ,QRPA calculations ,Physics ,QC1-999 - Abstract
The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.
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- 2022
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3. Mirror symmetry at mass A = 54: E4 effective charges near doubly magic 56Ni
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D. Rudolph, B. Blank, J. Giovinazzo, T. Roger, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, and M. Versteegen
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54Ni ,Nuclear shell model ,Isospin symmetry ,Electromagnetic decay ,E4 transition ,Effective charges ,Physics ,QC1-999 - Abstract
Proton-emission branches of the 10+ isomer in the Tz=−1 nucleus 54Ni have been imaged with the active target and time projection chamber (ACTAR TPC) in an experiment conducted at the Grand Accélérateur National d'Ions Lourds (GANIL). The completed decay scheme allows derivation of the reduced transition strengths, B(E2;10+→8+) and B(E4;10+→6+), for the two competing γ-ray transitions. By means of a comparison with their well-known ‘mirror transitions’ in Tz=+1 54Fe, and aided by a variety of shell-model calculations in the fp model space, effective charges for E4 transitions near N=Z 56Ni can be deduced: επ≈1.40 and εν≈0.30. Mirror-energy differences are explored with various shell-model interactions and isospin-symmetry breaking terms.
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- 2022
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4. Author Correction: 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC
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J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, B. A. Brown, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D. M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G. F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, and M. Versteegen
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Science - Published
- 2022
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5. Sizeable beta-strength in 31Ar (β3p) decay
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G.T. Koldste, B. Blank, M.J.G. Borge, J.A. Briz, M. Carmona-Gallardo, L.M. Fraile, H.O.U. Fynbo, J. Giovinazzo, J.G. Johansen, A. Jokinen, B. Jonson, T. Kurturkian-Nieto, T. Nilsson, A. Perea, V. Pesudo, E. Picado, K. Riisager, A. Saastamoinen, O. Tengblad, J.-C. Thomas, and J. Van de Walle
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Physics ,QC1-999 - Abstract
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.
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- 2014
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6. Experimental setup for Weak Interaction Studies with Radioactive ion-beams WISArD
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D. Atanasov, F. Cresto, L. Nies, M. Pomorski, M. Versteegen, P. Alfaurt, V. Araujo-Escalona, P. Ascher, B. Blank, L. Daudin, D. Guillet, X. Fléchard, J. Ha, A. Husson, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian-Nieto, L. Leterrier, R. Lica, E. Liénard, C. Mihai, C. Neacsu, A. Ortega-Moral, G. Pascovici, M. Roche, N. Severijns, S. Vanlangendonck, A. Welker, and D. Zákoucký
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Nuclear and High Energy Physics ,Detectors and Experimental Techniques ,Instrumentation - Abstract
The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The experiment aims to extend the present limits on scalar and tensor currents in the weak interaction and hence search for physics beyond the Standard Model. The evaluation of these limits relies on measuring the proton energy in beta-delayed proton emission, sensitive to both the beta-neutrino angular correlation coefficient aβν and the Fierz interference term b. The method tries to improve previous studies by considering the positron-proton coincidences when determining the kinematic shift in the energy of the emitted protons. Using this coincidence technique, the aβν and b coefficients will be measured at the per mil level. Simulations were employed to optimize the ion beam transport efficiency and validate proof-of-principle results obtained in November 2018 (Nov2018). Upgrades are ongoing, and we are looking into improvements to the overall performance of the setup.
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- 2023
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7. WISArD : Weak Interaction Studies with 32Ar Decay
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Maud Versteegen, P. Alfaurt, P. Ascher, D. Atanasov, B. Blank, F. Cresto, L. Daudin, X. Fléchard, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian-Nieto, E. Liénard, M. Pomorski, N. Severijns, S. Vanlangendonck, and D. Zakoucky
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- 2022
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8. Indirect measurements of neutron-induced reaction cross sections at heavy-ion storage rings
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M. Sguazzin, B. Jurado, J. Pibernat, J. A. Swartz, M. Grieser, J. Glorius, Yu. A. Litvinov, R. Reifarth, K. Blaum, P. Alfaurt, P. Ascher, L. Audouin, C. Berthelot, B. Blank, B. Bruckner, S. Dellmann, I. Dillmann, C. Domingo-Pardo, M. Dupuis, P. Erbacher, M. Flayol, O. Forstner, D. Freire-Fernández, M. Gerbaux, J. Giovinazzo, S. Grévy, C. J. Griffin, A. Gumberidze, S. Heil, A. Heinz, D. Kurtulgil, G. Leckenby, S. Litvinov, B. Lorentz, V. Méot, J. Michaud, S. Perard, N. Petridis, U. Popp, D. Ramos, M. Roche, M.S. Sanjari, R.S. Sidhu, U. Spillmann, M. Steck, Th. Stöhlker, B. Thomas, L. Thulliez, and M. Versteegen
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General Medicine - Abstract
Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars and for applications in nuclear technology. However, their measurement is very complicated due to the radioactivity of the targets involved. We propose to circumvent this problem by using the surrogate reaction method in inverse kinematics, where the nucleus formed in the neutron- induced reaction of interest is produced by a reaction involving a radioactive heavy-ion beam and a stable, light target nucleus. The probabilities as a function of the compound-nucleus excitation energy for γ-ray emission, neutron emission and fission, which can be measured with the surrogate reaction, are particularly useful to constrain model parameters and to obtain more accurate predictions of the neutron-induced reaction cross sections of interest. Yet, the full development of the surrogate method is hampered by numerous long- standing target issues, which can be solved by combining surrogate reactions with the unique and largely unexplored possibilities at heavy-ion storage rings. In this contribution, we describe the developments we are carrying out to measure for the first time simultaneously γ-ray emission, neutron emission and fission probabilities at the storage rings of the GSI/FAIR facility. In particular, we will present the first results of the proof of principle experiment, which we performed in June 2022 at the Experimental Storage Ring (ESR) of GSI/FAIR.
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- 2023
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9. Proton 3D tracking and emission time from a short-lived isomer with ACTAR TPC
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J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, H. Alvarez-Pol, A. Arokiaraj, P. Ascher, M. Camaaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, A. Ortega Moral, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, M. Versteegen, Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), Université de Bordeaux (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), 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)
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p: tracks ,data analysis method ,Nuclear and High Energy Physics ,track data analysis ,Short-lived decays ,ACTAR TPC ,Proton radioactivity ,tracks: length ,Track reconstruction ,time projection chamber ,nickel: nuclide ,efficiency ,radioactivity ,decay: time ,branching ratio ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Instrumentation - Abstract
International audience; An experiment was conducted at the GANIL/LISE3 facility to produce the 10+ isomer of 54Ni and measure its proton radioactivity decay branches. The proton detection was achieved with the ACTAR TPC device that enabled the separation of the small signal of the emitted proton from the large signal of the implanted ion, while the decay half-life is of the order of 150 ns. From the measured data, the emitted proton track length and the decay time of the ion can be extracted simultaneously. The full proton radioactivity pattern could be established, with two emission branches and their relative branching ratio. Data processing and analysis that allowed to identify and separate the ion and the proton signals in order to reconstruct the particles trajectories and decay time are detailed. The evaluation of the detection efficiency for the proton radioactivity branches based on a full simulation is described.
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- 2022
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10. 4D-imaging of drip-line radioactivity by detecting proton emission from Ni-54m pictured with ACTAR TPC
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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)
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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.
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- 2021
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11. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]
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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
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Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Atomic physics ,010306 general physics ,01 natural sciences - Published
- 2021
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12. β decay of the very neutron-deficient Ge60 and Ge62 nuclei
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Momoko Tanaka, E. Ganioǧlu, Gabor Kiss, F. Diel, Daiki Nishimura, G. de Angelis, F. Molina, Naohito Inabe, Toshiyuki Kubo, T. Kurtukian-Nieto, D. R. Napoli, A. Montaner-Pizá, P. A. Söderström, A. Boso, P. Ascher, S. Grévy, A. I. Morales, V. H. Phong, Shunji Nishimura, J. Giovinazzo, P. Aguilera, C. Sidong, Shigeru Kubono, J. Chiba, R. B. Cakirli, Y. Fujita, Hiroyoshi Sakurai, S. Yagi, C. Magron, J. Agramunt, V. Guadilla, B. Rubio, Y. Shimizu, M. Gerbaux, H. Oikawa, D. Lubos, D. S. Ahn, P. Doornenbal, C. Borcea, Shintaro Go, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, N. Fukuda, Jin Wu, Y. Takei, H. Suzuki, Alejandro Algora, T. Goigoux, and W. Gelletly
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Physics ,Isotope ,010308 nuclear & particles physics ,Branching fraction ,Excited state ,0103 physical sciences ,Neutron ,Atomic physics ,010306 general physics ,Ground state ,7. Clean energy ,01 natural sciences ,Fermi Gamma-ray Space Telescope - Abstract
We report here the results of a study of the $\beta$ decay of the proton-rich Ge isotopes, $^{60}$Ge and $^{62}$Ge, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of $^{62}$Ge (73.5(1) ms), $^{60}$Ge (25.0(3) ms) and its daughter nucleus, $^{60}$Ga (69.4(2) ms). We measured individual $\beta$-delayed proton and $\gamma$ emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total $\beta$-delayed proton-emission branching ratio of 67(3)% has been obtained for $^{60}$Ge. New information has been obtained on the energy levels populated in $^{60}$Ga and on the 1/2$^-$ excited state in the $\beta p$ daughter $^{59}$Zn. We extracted a ground state to ground state feeding of 85.3(3)% for the decay of $^{62}$Ge. Eight new $\gamma$ lines have been added to the de-excitation of levels populated in the $^{62}$Ga daughter.
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- 2021
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13. Detailed study of the decay of 32Ar
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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)
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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.
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- 2021
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14. 4D-imaging of drip-line radioactivity by detecting proton emission from
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J, Giovinazzo, T, Roger, B, Blank, D, Rudolph, B A, Brown, H, Alvarez-Pol, A, Arokia Raj, P, Ascher, M, Caamaño-Fresco, L, Caceres, D M, Cox, B, Fernández-Domínguez, J, Lois-Fuentes, M, Gerbaux, S, Grévy, G F, Grinyer, O, Kamalou, B, Mauss, A, Mentana, J, Pancin, J, Pibernat, J, Piot, O, Sorlin, C, Stodel, J-C, Thomas, and M, Versteegen
- 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
- Published
- 2020
15. Spectroscopy of Cd99 and In101 from β decays of In99 and Sn101
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F. Browne, Zhengyu Xu, I. Kojouharov, Y. F. Fang, A. Blazhev, Jinguang Wu, D. S. Ahn, Roman Gernhäuser, P. A. Söderström, D. Kameda, B. Blank, Igor T. Čeliković, T. Isobe, Shunji Nishimura, R. Krücken, H. Schaffner, M. Górska, P. Doornenbal, Z. Wang, I. Nishizuka, Toshiyuki Kubo, Stephen Rice, D. Lubos, K. Steiger, S. Ilieva, M. M. Rajabali, Naohito Inabe, Joochun Park, Young-Ki Kim, Younghun Kwon, A. Jungclaus, Hiroshi Suzuki, Hirofumi Watanabe, Y. Shimizu, T. Faestermann, H. Grawe, N. Kurz, P. Boutachkov, Naoki Fukuda, L. Sinclair, Giuseppe Lorusso, H. Baba, N. Goel, Hiroyoshi Sakurai, Toshiyuki Sumikama, K. Moschner, J. Giovinazzo, Hiroyuki Takeda, G. D. Kim, Daichi Murai, M. Lewitowicz, and Zena Patel
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Physics ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Excited state ,0103 physical sciences ,SHELL model ,Atomic physics ,010306 general physics ,Spectroscopy ,Branching (polymer chemistry) ,01 natural sciences ,Coincidence ,Spectral line - Abstract
We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions.
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- 2020
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16. Simultaneous measurements of the β -neutrino angular correlation in Ar32 pure Fermi and pure Gamow-Teller transitions using β -proton coincidences
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V. Araujo-Escalona, D. Zákoucký, E. Liénard, P. Ascher, P. Alfaurt, Nathal Severijns, Xavier Flechard, J. Giovinazzo, T. Kurtukian-Nieto, M. Gerbaux, G. Quéméner, M. Versteegen, Dinko Atanasov, S. Grévy, L. Daudin, B. Blank, and S. Vanlangendonck
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Semileptonic decay ,Physics ,Proton ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Weak interaction ,Kinetic energy ,01 natural sciences ,7. Clean energy ,Beta decay ,Standard Model ,0103 physical sciences ,High Energy Physics::Experiment ,Atomic physics ,Neutrino ,Proton emission ,Nuclear Experiment ,010306 general physics - Abstract
We report first time measurements of the beta-neutrino angular correlation based on the kinetic energy shift of protons emitted in parallel or anti-parallel directions with respect to the positron in the beta decay of $^{32}$Ar. This proof of principle experiment provided simultaneous measurements for the superallowed 0$^+$~$\rightarrow$~0$^+$ transition followed by a 3356~keV proton emission and for a Gamow-Teller transition followed by a 2123~keV proton emission. The results, respectively ${\tilde a_{\beta\nu}}=1.01(3)_{(stat)}(2)_{(syst)}$ and ${\tilde a_{\beta\nu}}=-0.22(9)_{(stat)}(2)_{(syst)}$, are found in agreement with the Standard Model. A careful analysis of the data shows that future measurements can reach a precision level of 10$^{-3}$ for both pure Fermi and pure Gamow-Teller decay channels, providing new constraints on both scalar and tensor weak interactions.
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- 2020
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17. ACTAR TPC performance with GET electronics
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T. Roger, J. Pancin, J. Giovinazzo, J. Pibernat, 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)
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Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Physics::Instrumentation and Detectors ,Resolution (electron density) ,Detector ,ACTAR TPC ,Charge density ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Tracking (particle physics) ,01 natural sciences ,7. Clean energy ,Track reconstruction ,Reduced size ,0103 physical sciences ,Electronic engineering ,Particle ,Electronics ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,010306 general physics ,Instrumentation ,Energy (signal processing) ,GET electronics ,ComputingMilieux_MISCELLANEOUS ,Detector performance - Abstract
International audience; The ACTAR TPC detector has been designed as a state-of-art detector for the tracking of ions in nuclear physics experiments. We performed various sets of test measurements with an alpha source, using a reduced size demonstrator of this device, in order to estimate the performances that can be expected from the tracks analysis. The parameters from the detector, from the electronics and from the analysis have been studied, with their influence on the energy resolution and the tracking precision. An effective full 3D charge distribution reconstruction method is also presented in order to analyze particle trajectories in any direction.
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- 2020
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18. Studying the Exotic Decay $^{70}Kr$ $\rightarrow$ $^{70}Br$
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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)
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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
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- 2020
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19. Branching ratio of the super-allowed $\beta$ decay of $^{10}$C
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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)
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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.
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- 2020
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20. Precision efficiency calibration of a high-purity co-axial germanium detector at low energies
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B. Blank, P. Ascher, J. C. Thomas, M. Gerbaux, T. Kurtukian Nieto, S. Grévy, M. Versteegen, 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), 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)
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Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Photon ,Period (periodic table) ,Physics::Instrumentation and Detectors ,Astrophysics::High Energy Astrophysical Phenomena ,Monte Carlo method ,FOS: Physical sciences ,chemistry.chemical_element ,Germanium ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,0103 physical sciences ,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) ,010306 general physics ,gamma ray: irradiation ,Nuclear Experiment ,Instrumentation ,semiconductor detector: germanium ,Physics ,Range (particle radiation) ,010308 nuclear & particles physics ,Germanium detector ,Instrumentation and Detectors (physics.ins-det) ,Monte-Carlo simulations ,stability ,calibration ,Computational physics ,Semiconductor detector ,chemistry ,efficiency ,High Energy Physics::Experiment ,numerical calculations: Monte Carlo - Abstract
International audience; Following work done in the energy region above 100 keV, the high-precision calibration of a co-axial high-purity germanium detector has been continued in the energy region below 100 keV. Some of the previous measurements and Monte-Carlo simulations have been repeated with higher statistics and a new source measurement with 169 Yb has been added. For the energy range from 40 keV to 100 keV, an absolute precision for the detection efficiency of ± 0.2% has been reached, as previously obtained for energies above 100 keV. The low-energy behaviour of the germanium detector was further scrutinised by studying the germanium X-ray escape probability for the detection of low-energy photons. In addition, one experimental point, a γ ray at 2168 keV from the decay of 38 K, has been included for the total-to-peak ratios agreeing well with simulations. The same γ ray was also added for the single- and double-escape probabilities. Finally, the long term stability of the efficiency of the germanium detector was investigated by regularly measuring the full-energy peak efficiency with a precisely calibrated 60 Co source and found to be perfectly stable over a period of 10 years.
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- 2020
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21. Demonstrator Detection System for the Active Target and Time Projection Chamber (ACTAR TPC) project
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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)
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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.
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- 2018
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22. GET electronics samples data analysis
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P. Baron, P. Sizun, J. Pancin, J. Pibernat, S. Anvar, T. Roger, A. Rebii, G. F. Grinyer, E. C. Pollacco, T. Goigoux, Eric Delagnes, J. Giovinazzo, J. L. Pedroza, B. Blank, 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, 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)
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Physics ,Nuclear and High Energy Physics ,Time projection chamber ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Detector ,Data analysis ,Time distribution ,Function (mathematics) ,01 natural sciences ,Signal ,0103 physical sciences ,Range (statistics) ,Electronic engineering ,TPC ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Electronics ,010306 general physics ,Raw data ,Instrumentation ,GET electronics - Abstract
International audience; The General Electronics for TPCs (GET) has been developed to equip a generation of time projection chamber detectors for nuclear physics, and may also be used for a wider range of detector types. The goal of this paper is to propose first analysis procedures to be applied on raw data samples from the GET system, in order to correct for systematic effects observed on test measurements. We also present a method to estimate the response function of the GET system channels. The response function is required in analysis where the input signal needs to be reconstructed, in terms of time distribution, from the registered output samples.
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- 2016
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23. Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay
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H. Baba, N. Goel, I. Kojouharov, T. Faestermann, N. Kurz, M. Górska, Young-Ki Kim, Stephen Rice, S. Ilieva, Younghun Kwon, Naoki Fukuda, P. Boutachkov, Shunji Nishimura, Z. Wang, Mustafa Rajabali, B. Blank, A. Blazhev, T. Isobe, K. Moschner, Zhi-Fang Xu, I. Nishizuka, K. Steiger, D. S. Ahn, Igor T. Čeliković, Daichi Murai, Toshiyuki Sumikama, M. Lewitowicz, Joochun Park, J. Giovinazzo, N. Warr, Hiroyuki Takeda, Y. F. Fang, A. Jungclaus, Roman Gernhäuser, Hirofumi Watanabe, Y. Shimizu, Hiroshi Suzuki, D. Kameda, Zena Patel, L. Sinclair, P. Doornenbal, Jinguang Wu, Giuseppe Lorusso, Toshiyuki Kubo, P. A. Söderström, Naohito Inabe, R. Krücken, F. Browne, Hiroyoshi Sakurai, H. Schaffner, and D. Lubos
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Physics ,End point ,Proton ,0103 physical sciences ,Center (category theory) ,General Physics and Astronomy ,Value (computer science) ,Atomic physics ,010306 general physics ,Spectroscopy ,01 natural sciences ,Beta decay ,Energy (signal processing) - Abstract
A record number of ^{100}Sn nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of ^{100}Sn were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0^{+}→1^{+} Gamow-Teller decay was improved to B_{GT}=4.4_{-0.7}^{+0.9}. A discrimination between different model calculations was possible for the first time, and the level scheme of ^{100}In is investigated further.
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- 2019
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24. New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100
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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
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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.
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- 2019
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25. Scalar current limit from the beta-neutrino correlation: the WISArD experiment
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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)
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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.
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- 2019
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26. Commissioning of the ACtive TARget and Time Projection Chamber (ACTAR TPC)
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B. Mauss, C. Borcea, G. Wittwer, J. Pibernat, M. Caamaño, A. Revel, J. Pancin, G. Mantovani, O. Poleshchuk, A. Arokiaraj, F. Saillant, T. Roger, B. Fernández-Domínguez, Jiecheng Yang, J. Refsgaard, B. Bastin, M. Babo, J. Giovinazzo, P. Gangnant, E. Foulon-Moret, V. Alcindor, B. Monteagudo, P. Morfouace, S. Ceruti, T. Marchi, H. Alvarez-Pol, A. T. Laffoley, Riccardo Raabe, S. Giraud, G. F. Grinyer, M. Stanoiu, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-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), 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 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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)
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Physics ,micromegas ,[PHYS]Physics [physics] ,Nuclear and High Energy Physics ,Resonant scattering ,Time projection chamber ,Proton ,010308 nuclear & particles physics ,business.industry ,Physics::Instrumentation and Detectors ,Detector ,MicroMegas detector ,Tracking (particle physics) ,01 natural sciences ,Charged particle ,Recoil ,Optics ,0103 physical sciences ,Time Projection Chamber ,010306 general physics ,business ,Nuclear Experiment ,Instrumentation ,Beam (structure) ,ACtive TARget - Abstract
The ACtive TARget and Time Projection Chamber (ACTAR TPC) is a novel gas-filled detector that has recently been constructed at GANIL. This versatile detector is a gaseous thick target that allows the tracking of charged particles in three dimensions and provides a precise reaction energy reconstruction from the vertex position. A commissioning experiment using resonant scattering of a 3.2MeV/nucleon 18O beam on an isobutane gas (proton) target was performed. The beam and the heavy scattered ions were stopped in the gas volume, while the light recoil left the active volume and were stopped in auxiliary silicon detectors. A dedicated tracking algorithm was applied to determine the angle of emission and the length of the trajectory of the ions, to reconstruct the reaction kinematics used to built the excitation functions of the 1H(18O, 18O)1H and 1H(18O, 15N)4He reactions. In this article, we describe the design of the detector and the data analysis, that resulted in center of mass reaction energy resolutions of 38(4)keV FWHM and 54(9)keV FWHM for the proton and alpha channels, respectively. The ACtive TARget and Time Projection Chamber (ACTAR TPC) is a novel gas-filled detector that has recently been constructed at GANIL. This versatile detector is a gaseous thick target that allows the tracking of charged particles in three dimensions and provides a precise reaction energy reconstruction from the vertex position. A commissioning experiment using resonant scattering of a 3.2MeV/nucleon 18O beam on an isobutane gas (proton) target was performed. The beam and the heavy scattered ions were stopped in the gas volume, while the light recoil left the active volume and were stopped in auxiliary silicon detectors. A dedicated tracking algorithm was applied to determine the angle of emission and the length of the trajectory of the ions, to reconstruct the reaction kinematics used to built the excitation functions of the 1H(18O, 18O)1H and 1H(18O, 15N)4He reactions. In this article, we describe the design of the detector and the data analysis, that resulted in center of mass reaction energy resolutions of 38(4)keV FWHM and 54(9)keV FWHM for the proton and alpha channels, respectively. ispartof: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment vol:940 pages:498-504 status: published
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- 2019
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27. Hybrid model for two-proton radioactivity
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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)
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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.
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- 2019
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28. Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies
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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)
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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.
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- 2020
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29. Beta decay of the Tz=-2 nucleus 64Se and its descendants
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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)
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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.
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- 2018
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30. $^{67}$Kr Two-proton Radioactivity: Results and Theoretical Interpretations
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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)
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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.
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- 2018
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31. β decays of the heaviest N=Z−1 nuclei and proton instability of In97
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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
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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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32. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]
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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
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0103 physical sciences ,010306 general physics ,01 natural sciences - Published
- 2018
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33. Metal-core pad-plane development for ACTAR TPC
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G. F. Grinyer, J. Giovinazzo, B. Mauss, P. Rosier, J. L. Pedroza, C. Huss, J. Pancin, T. Goigoux, F. Saillant, T. Roger, G. Wittwer, J. Pibernat, R. De Oliveira, A. Rebii, 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), 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 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)
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Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Plane (geometry) ,business.industry ,Physics::Instrumentation and Detectors ,Detector ,Pad-plane ,MicroMegas detector ,Alpha particle ,01 natural sciences ,7. Clean energy ,Signal ,Charged particle ,Optics ,0103 physical sciences ,Active targets ,TPC ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Routing (electronic design automation) ,010306 general physics ,business ,Instrumentation ,Energy (signal processing) - Abstract
With the recent development of active targets and time projection chambers (ACTAR TPC) as detectors for fundamental nuclear physics experiments, the need arose for charge collection planes with a high density of readout channels. In order to fulfill the mechanical constraints for the ACTAR TPC device, we designed a pad-plane based on a metal-core circuit with an conceptually simple design and routing for signal readout, named FAKIR (in reference to a fakir bed of nails). A test circuit has been equipped with a micro mesh gaseous structure (micromegas) for signal amplification and a dedicated readout electronics. Test measurements have been performed with an 55 Fe X-ray source giving an intrinsic energy resolution (FWHM) of 22 ± 1 % at 5 . 9 keV , and with a 3-alpha source for which a resolution of about 130 ± 20 keV at 4 . 8 MeV has been estimated. The pad-plane has been mounted into a reduced size demonstrator version of the ACTAR TPC detector, in order to illustrate charged particle track reconstruction. The tests preformed with the X-ray and the 3-alpha sources shows that results obtained from pads signals are comparable to the intrinsic result from the micro-mesh signal. In addition, a simple alpha particle tracks analysis is performed to demonstrate that the pad plane allows a precise reconstruction of the direction and length of the trajectories.
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- 2018
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34. Gamma-ray branching ratios in the decay of $^{49}$Cr
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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.
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- 2018
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35. High-precision efficiency calibration of a high-purity co-axial germanium detector
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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)
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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.
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- 2015
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36. Publisher's Note: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]
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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
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Physics ,Crystallography - Abstract
J. Park et al. -- 1 pag. -- Original Article: Properties of γ-decaying isomers and isomeric ratios in the 100 Sn region. Phys. Rev. C 96, 044311 (2017)
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- 2017
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37. Properties of γ -decaying isomers and isomeric ratios in the Sn100 region
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Joochun Park, A. Jungclaus, Hiroshi Suzuki, G. D. Kim, Daichi Murai, Igor T. Čeliković, M. Lewitowicz, F. Browne, P. A. Söderström, L. Sinclair, Naoki Fukuda, Shunji Nishimura, Y. F. Fang, Toshiyuki Kubo, A. Blazhev, Stephen Rice, R. Krücken, Roman Gernhäuser, S. Ilieva, M. M. Rajabali, M. Górska, Hidetada Baba, Toshiyuki Sumikama, Zena Patel, Zhengyu Xu, T. Isobe, D. S. Ahn, J. Giovinazzo, Hiroyuki Takeda, Young-Ki Kim, T. Faestermann, D. Kameda, H. Grawe, N. Kurz, I. Nishizuka, P. Doornenbal, K. Steiger, Bertram Blank, D. Lubos, Naohito Inabe, Hiroyoshi Sakurai, Hirofumi Watanabe, Y. Shimizu, K. Moschner, Jin Wu, H. Schaffner, P. Boutachkov, Z. Wang, N. Goel, Giuseppe Lorusso, and I. Kojouharov
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Physics ,Internal conversion ,Chemical research ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,0103 physical sciences ,Center (category theory) ,Atomic physics ,010306 general physics ,Spectroscopy ,7. Clean energy ,01 natural sciences ,Energy (signal processing) - Abstract
Half-lives and energies of $\ensuremath{\gamma}$ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic $^{100}\mathrm{Sn}$ were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from a new $({4}^{+})$ isomer with ${T}_{1/2}=0.23(6)\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$ in $^{92}\mathrm{Rh}$, a 44-keV $E2\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ ray from the $({15}^{+})$ isomer in $^{96}\mathrm{Ag}$, and ${T}_{1/2}({6}^{+})=13(2)$ ns in $^{98}\mathrm{Cd}$. Shell-model calculations of electromagnetic transition strengths in the $({p}_{1/2},{g}_{9/2})$ model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed $\ensuremath{\gamma}$ rays in $^{100}\mathrm{Sn}$, new constraints on the ${T}_{1/2}$, $\ensuremath{\gamma}$-ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in $^{100}\mathrm{Sn}$.
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- 2017
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38. Simultaneous investigation of the T=1(Jπ=0+) and T=0(Jπ=9+) β decays in Br70
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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
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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.
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- 2017
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39. Half-life determination of Tz = -1 and Tz = - $ {\frac{{1}}{{2}}}$ 1 2 proton-rich nuclei and the $ \beta$ β decay of 58Zn
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W. Gelletly, Y. Fujita, B. Blank, P. Ascher, L. Kucuk, Riccardo Raabe, F. de Oliveira Santos, L. Perrot, G. Susoy, T. Adachi, F. Molina, E. Ganioglu, J. C. Thomas, F. M. Marqués, J. Giovinazzo, A. Montaner-Pizá, Y. Oktem, Berta Rubio, P. C. Srivastava, S. E. A. Orrigo, Alejandro Algora, Hisanori Fujita, R. B. Cakirli, Atsushi Tamii, and S. Grévy
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Physics ,Nuclear and High Energy Physics ,Decay scheme ,Isotopes of germanium ,Proton ,010308 nuclear & particles physics ,Isotopes of copper ,Hadron ,Analytical chemistry ,Half-life ,7. Clean energy ,01 natural sciences ,Beta decay ,0103 physical sciences ,Atomic physics ,010306 general physics ,Radioactive decay - Abstract
We have measured the $ \beta$ -decay half-lives of 16 neutron-deficient nuclei with $ T_{z} = -1/2$ and -1 , ranging from chromium to germanium. They were produced in an experiment carried out at GANIL and optimized for the production of$^{58}$Zn , for which in addition we present the decay scheme and absolute Fermi and Gamow-Teller transition strengths. Since all of these nuclei lie on the rp -process pathway, the $ T_{1/2}$ values are important ingredients for the rp -process reaction flow calculations and for models of X-ray bursters.
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- 2017
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40. Precise measurements of half-lives and branching ratios for the $ \beta$ β mirror transitions in the decay of 23Mg and 27Si
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T. Kurtukian Nieto, P. Alfaurt, Ilkka Pohjalainen, Sami Rinta-Antila, B. Blank, Heikki Penttilä, Jukka Koponen, Tommi Eronen, L. Daudin, Juuso Reinikainen, S. Grévy, M. Roche, N. A. Smirnova, Annika Voss, J. Giovinazzo, M. Gerbaux, Jani Hakala, C. Magron, Iain Moore, Mikael Reponen, B. Thomas, Veli Kolhinen, Dmitry Gorelov, A. de Roubin, L. Xayavong, and H. Guérin
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Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Branching fraction ,Electron capture ,Hadron ,01 natural sciences ,Isospin ,0103 physical sciences ,Isotopes of silicon ,Atomic physics ,010306 general physics ,Isotopes of magnesium ,Radioactive decay ,Dimensionless quantity - Abstract
Half-lives and branching ratios for the two mirror $ \beta$ decays of$^{23}$Mg and$^{27}$Si have been measured at the University of Jyvaskyla with the IGISOL facility. The results obtained, $ T_{1/2}=11.303(3)$ s and $ T_{1/2}= 4.112(2)$ s for the half-lives of$^{23}$Mg and$^{27}$Si , respectively, are 7 and 8 times more precise than the averages of previous measurements. The values obtained for the super-allowed branching ratios of$^{23}$Mg and$^{27}$Si are $ B.R.=92.18(8)\%$ and $ B.R.=99.74(2)\%$ , respectively. The result for$^{23}$Mg is three times more precise than the average of the previous measurements, while for$^{27}$Si the precision has not been improved, the average of the previous measurements being already very precise. Isospin-symmetry-breaking corrections have been calculated for the two nuclei to determine the corrected $ {F}t$ value.
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- 2017
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41. Beta Decay Study of the Tz=−2 56Zn Nucleus and the Determination of the Half-Lives of a Few fp-shell Nuclei
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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
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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.
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- 2014
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42. Upgrade of the SPIRAL identification station for high-precision measurements of nuclear β decay
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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)
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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.
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- 2014
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43. Observation of the 2+ isomer in Co52
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J. C. Thomas, J. Giovinazzo, B. Rubio, P. Ascher, M. Gerbaux, L. Popescu, A. M. Rogers, W. Gelletly, F. Molina, H. C. Kozer, J. Agramunt, L. Kucuk, Y. Fujita, E. Ganioǧlu, G. Susoy, L. Caceres, Takashi Suzuki, C. Stodel, Alejandro Algora, R. B. Cakirli, B. Bilgier, S. Grévy, Atsushi Tamii, T. Kurtukian-Nieto, B. Blank, O. Kamalou, and S. E.A. Orrigo
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Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Atomic physics ,010306 general physics ,Ground state ,01 natural sciences - Abstract
We report the first observation of the ${2}^{+}$ isomer in $^{52}\mathrm{Co}$, produced in the $\ensuremath{\beta}$ decay of the ${0}^{+}$, $^{52}\mathrm{Ni}$ ground state. We have observed three $\ensuremath{\gamma}$ rays at 849, 1910, and 5185 keV characterizing the $\ensuremath{\beta}$ de-excitation of the isomer. We have measured a half-life of 102(6) ms for the isomeric state. The Fermi and Gamow-Teller transition strengths for the $\ensuremath{\beta}$ decay of $^{52m}\mathrm{Co}$ to $^{52}\mathrm{Fe}$ have been determined. We also add new information on the $\ensuremath{\beta}$ decay of the ${6}^{+}$, $^{52}\mathrm{Co}$ ground state, for which we have measured a half-life of 112(3) ms.
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- 2016
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44. Two-Proton Radioactivity ofKr67
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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
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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.
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- 2016
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45. Two-Proton Radioactivity of $^{67}$Kr
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T, Goigoux, P, Ascher, B, Blank, M, Gerbaux, J, Giovinazzo, S, Grévy, T, Kurtukian Nieto, C, Magron, P, Doornenbal, G G, Kiss, S, Nishimura, P-A, Söderström, V H, Phong, J, Wu, D S, Ahn, N, Fukuda, N, Inabe, T, Kubo, S, Kubono, H, Sakurai, Y, Shimizu, T, Sumikama, H, Suzuki, H, Takeda, J, Agramunt, A, Algora, V, Guadilla, A, Montaner-Piza, A I, Morales, S E A, Orrigo, B, Rubio, Y, Fujita, M, Tanaka, W, Gelletly, P, Aguilera, F, Molina, F, Diel, D, Lubos, G, de Angelis, D, Napoli, C, Borcea, A, Boso, R B, Cakirli, E, Ganioglu, J, Chiba, D, Nishimura, H, Oikawa, Y, Takei, S, Yagi, K, Wimmer, G, de France, S, Go, B A, Brown, 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from ^{67}Kr. At the same time, no evidence for 2p emission of ^{59}Ge and ^{63}Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to ^{67}Kr as being the best new candidate among the three for two-proton radioactivity. ^{67}Kr 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 ^{67}Kr is 7.4(30) ms.
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- 2016
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46. High-precision Half-life And Branching Ratio Measurements For Superallowed $\beta^+$ Emitters At TRIUMF-ISAC
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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.
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- 2016
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47. Two-proton radioactivity of $^{67}$Kr
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T. Goigoux, P. Ascher, B. Blank, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian Nieto, C. Magron, J. Agramunt, A. Algora, V. Guadilla, A. Montaner-Piza, A. I. Morales, S. E. A. Orrigo, B. Rubio, D. S. Ahn, P. Doornenbal, N. Fukuda, N. Inabe, G. G. Kiss, T. Kubo, S. Kubono, S. Nishimura, H. Sakurai, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, P. Vi, J. Wu, Y. Fujita, M. Tanaka, W. Gelletly, P. Aguilera, F. Molina, F. Diel, D. Lubos, G. de Angelis, D. Napoli, C. Borcea, A. Boso, R. B. Cakirli, E. Ganioglu, J. Chiba, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, K. Wimmer, G. de France, S. Go, B. A. Brown, 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), Yu. E. Penionzhkevich, Yu.G. Sobolev, 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 ,RIKEN ,Proton ,010308 nuclear & particles physics ,Radiochemistry ,EURICA ,Two-proton ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,WAS3ABi ,Radioactivity ,0103 physical sciences ,010306 general physics ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2016
- Full Text
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48. Beta Decay Studies of Proton Rich Nuclei, an Important Ingredient for rp-Process Calculations
- Author
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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.
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- 2016
- Full Text
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49. New neutron-deficient isotopes from $^{78}$Kr fragmentation
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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)
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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
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- 2016
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50. βdecay of the exoticTz=−2nucleiFe48,Ni52, andZn56
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B. Blank, W. Gelletly, Y. Fujita, H. C. Kozer, R. B. Cakirli, P. Ascher, J. Giovinazzo, G. Susoy, F. Molina, L. Kucuk, L. Popescu, A. Algora, B. Rubio, C. Stodel, Takatoshi Suzuki, L. Caceres, T. Kurtukian-Nieto, E. Ganioglu, S. E. A. Orrigo, A. M. Rogers, S. Grévy, O. Kamalou, J. C. Thomas, M. Gerbaux, Atsushi Tamii, B. Bilgier, and Jorge Agramunt
- Subjects
Physics ,010308 nuclear & particles physics ,Nuclear Theory ,0103 physical sciences ,New energy ,Proton emission ,Atomic physics ,Nuclear Experiment ,010306 general physics ,01 natural sciences ,Fermi Gamma-ray Space Telescope - Abstract
The results of a study of the $\ensuremath{\beta}$ decays of three proton-rich nuclei with ${T}_{z}=\ensuremath{-}2$, namely $^{48}\mathrm{Fe},^{52}\mathrm{Ni}$, and $^{56}\mathrm{Zn}$, produced in an experiment carried out at GANIL, are reported. In all three cases we have extracted the half-lives and the total $\ensuremath{\beta}$-delayed proton emission branching ratios. We have measured the individual $\ensuremath{\beta}$-delayed protons and $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays and the branching ratios of the corresponding levels. Decay schemes have been determined for the three nuclei, and new energy levels are identified in the daughter nuclei. Competition between $\ensuremath{\beta}$-delayed protons and $\ensuremath{\gamma}$ rays is observed in the de-excitation of the $T=2$ isobaric analog states in all three cases. Absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. In addition, we discuss in detail the data analysis taking as a test case $^{56}\mathrm{Zn}$, where the exotic $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-proton decay has been observed.
- Published
- 2016
- Full Text
- View/download PDF
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