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

Author

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

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

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

Published
2014
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2. Observation of the 2+ isomer in Co52

Author

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

Subjects
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.

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

Author

B. Rubio, L. Kucuk, S. E. A. Orrigo, Y. Fujita, W. Gelletly, B. Blank, T. Adachi, P. Aguilera, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R. B. Cakirli, G. de France, F. de Oliveira Santos, H. Fujita, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grévy, O. Kamalou, H. C. Kozer, T. Kurtukian-Nieto, M. Marqués, F. Molina, D. Nishimura, H. Oikawa, Y. Oktem, L. Perrot, L. Popescu, R. Raabe, A. M. Rogers, P. C. Srivastava, G. Susoy, C. Stodel, T. Suzuki, A. Tamii, J. C. Thomas, Instituto de Fisica Corpuscular ( IFIC ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ) -Universitat de València ( UV ), Istanbul University, Research Center for Nuclear Physics ( RCNP ), Osaka University [Osaka], Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Istambul University, Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Physics, Tokyo University of Science, Noda, Chiba, Laboratoire de psychologie de Caen Normandie ( LPCN ), Normandie Université ( NU ) -Normandie Université ( NU ), Centre d'Etude de l'Energie Nucléaire ( SCK-CEN ), Argonne National Laboratory (ANL) - Physics Division (PHY), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Research Center for Nuclear Physics (RCNP), University of Surrey (UNIS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

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

Published
2016
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4. βdecay of the exoticTz=−2nucleiFe48,Ni52, andZn56

Author

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
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5. The 71Ga(3He, t) reaction and the low-energy neutrino response

Author

Pavel P. Povinec, Kichiji Hatanaka, T. Adachi, A. Okamoto, Fedor Šimkovic, G. Susoy, H. Okamura, R. G. T. Zegers, Hisanori Fujita, H. C. Kozer, B. A. Brown, M. Fujiwara, J. Van de Walle, P. Puppe, R. Hodak, J. H. Thies, Hidetoshi Akimune, M. Holl, Mohsen Harakeh, Takayoshi Suzuki, H. Ejiri, A. Lennarz, N. T. Khai, C. Iwamoto, V. N. Gavrin, Y. Fujita, E. Ganioglu, D. Frekers, E.-W. Grewe, Atsushi Tamii, B. Bilgier, Carol Guess, and B.T. Cleveland

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Electron capture, Solar neutrino, 01 natural sciences, 7. Clean energy, Nuclear physics, Neutrino detector, Excited state, 0103 physical sciences, GALLEX, Neutrino, 010306 general physics, Ground state, Charged current
Abstract

A 71Ga(3He, t)71Ge charge-exchange experiment was performed to extract with high precision the Gamow–Teller (GT) transition strengths to the three lowest-lying states in 71Ge, i.e., the ground state ( 1 / 2 − ) , the 175 keV ( 5 / 2 − ) and the 500 keV ( 3 / 2 − ) excited states. These are the relevant states, which are populated via a charged-current reaction induced by neutrinos from reactor-produced 51Cr and 37Ar sources. A precise measurement of the GT transition strengths is an important input into the calibration of the SAGE and GALLEX solar neutrino detectors and addresses a long-standing discrepancy between the measured and evaluated capture rates from the 51Cr and 37Ar neutrino calibration sources, which has recently spawned new ideas about unconventional neutrino properties.

Published
2011
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6. Competition of β-delayed protons and β-delayed γ rays in $^{56}$Zn and the exotic β-delayed γ-proton decay

Author

H. Fujita, S. Grévy, Takatoshi Suzuki, Atsushi Tamii, B. Bilgier, B. Rubio, J. C. Thomas, G. Susoy, Y. Fujita, C. Stodel, O. Kamalou, A. Algora, J. Giovinazzo, Jorge Agramunt, S. E. A. Orrigo, W. Gelletly, A. M. Rogers, M. Gerbaux, H. C. Kozer, B. Blank, P. Ascher, R. B. Cakirli, E. Ganioglu, Lucia Popescu, L. Kucuk, F. Molina, T. Kurtukian-Nieto, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), V. Greco, M. La Cognata, S. Pirrone, F. Rizzo, C. Spitaleri, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

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

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

Author

B. Bilgier, S. E. A. Orrigo, O. Kamalou, L. Kucuk, Yoshitaka Fujita, B. Blank, P. Ascher, B. Rubio, G. Susoy, S. Grévy, Atsushi Tamii, T. Suzuki, L. Popescu, J. Giovinazzo, W. Gelletly, J. Agramunt, T. Kurtukian-Nieto, H. C. Kozer, F. Molina, M. Gerbaux, A. M. Rogers, E. Ganioglu, R. B. Cakirli, J. C. Thomas, H. Fujita, C. Stodel, L. Cáceres, A. Algora, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), GANILEXP, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
2015
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8. $\beta $-delayed $\gamma $-proton Decay in $^{56}$Zn: Analysis of the Charged-particle Spectrum

Author

H. C. Kozer, Lucia Popescu, Toshio Suzuki, L. Caceres, L. Kucuk, J. C. Thomas, R. B. Cakirli, P. Ascher, A. M. Rogers, Ch. Stodel, J. Agramunt, Berta Rubio, Yoshitaka Fujita, F. Molina, G. Susoy, S. E. A. Orrigo, M. Gerbaux, J. Giovinazzo, Alejandro Algora, O. Kamalou, H. Fujita, T. Kurtukian-Nieto, E. Ganioglu, B. Blank, Atsushi Tamii, B. Bilgier, S. Grévy, W. Gelletly, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), GANILEXP, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

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

Author

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

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

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

Published
2014
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10. Observation of the β-delayed γ-proton decay of (56)Zn and its impact on the Gamow-Teller strength evaluation

Author

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

Abstract

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

Published
2014

11. Beta decay of the exotic Tz = - 2, $^{56}$Zn nucleus and half-life of various proton-rich Tz = -1 nuclei

Author

B. Rubio, E. Ganioglu, W. Gelletly, H. C. Kozer, Lucia Popescu, F. Molina, L. Kucuk, T. Kurtukian-Nieto, B. Blank, A. M. Rogers, J. C. Thomas, S. E.A. Orrigo, Takashi Suzuki, G. Susoy, O. Kamalou, J. Giovinazzo, M. Gerbaux, Y. Fujita, Alejandro Algora, Hisanori Fujita, Atsushi Tamii, B. Bilgier, S. Grévy, P. Ascher, C. Stodel, R. B. Cakirli, J. Agramunt, L. Caceres, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, University of Surrey, University of Surrey (UNIS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, SKC CEN, Belgique, Physics Division, Argonne National Laboratory, Argonne National Laboratory [Lemont] (ANL), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

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

Published
2014
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12. Pygmy dipole resonance and dipole polarizability in 90Zr

Author

Makoto Sakuda, T. Izumi, Y. Shimbara, C. Iwamoto, Hiroaki Utsunomiya, Atsushi Tamii, Hidetoshi Akimune, Hisanori Fujita, A. Okamoto, Hitoshi Nakada, Tamio Yamagata, Takaaki Mori, T. Hashimoto, Takeo Kondo, T.-W. Lui, B. Bilgier, M. Nagashima, Tatsushi Shima, Hiroshi Matsubara, Yoshitaka Fujita, H. C. Kozer, Kichiji Hatanaka, Takeo Kawabata, and Takashi Suzuki

Subjects
Physics, Electric dipole moment, Bond dipole moment, Dipole, Polarizability, Transition dipole moment, Physics::Atomic Physics, Atomic physics, Electric dipole transition, Multipole expansion, Magnetic dipole
Abstract

Electric dipole (E1) reduced transition probability B(E1) of 90Zr was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El Coulomb excitation, and the E1 strength of the pygmy dipole resonance was found in the vicinity of the neutron threshold in the low-energy tail of the giant dipole resonance. Using the data, we plan to determine the precise dipole polarizability αD which is defined as an inversely energy-weighted sum value of the elecrric dipole strength. The dipole polarizability is expected to constrain the symmetry energy term of the neutron matter equation of state. Thus systematical measurement of the dipole polarizability is important.

Published
2014
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13. Separation of Pygmy Dipole andM1Resonances inZr90by a High-Resolution Inelastic Proton Scattering Near 0°

Author

Takaaki Mori, Takayoshi Suzuki, Kichiji Hatanaka, M. Nagashima, Hiroshi Matsubara, H. C. Kozer, Y. Fujita, Tatsushi Shima, Makoto Sakuda, Hitoshi Nakada, Takeo Kondo, Hiroaki Utsunomiya, A. Okamoto, T. Izumi, Tamio Yamagata, Takeo Kawabata, Y. Shimbara, Hidetoshi Akimune, Y.-W. Lui, C. Iwamoto, Atsushi Tamii, B. Bilgier, and Hisanori Fujita

Subjects
Physics, Dipole, General Physics and Astronomy, Resonance, Sum rule in quantum mechanics, Coulomb excitation, Born approximation, Inelastic scattering, Atomic physics, Multipole expansion, Energy (signal processing)
Abstract

A high-resolution measurement of inelastic proton scattering off $^{90}\mathrm{Zr}$ near 0\ifmmode^\circ\else\textdegree\fi{} was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7--12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of $E1$ and $M1$ transition densities and inclusion of $E1$ Coulomb excitation. The analysis separated pygmy dipole and $M1$ resonances in the forest at ${E}_{\mathrm{PDR}}=9.15\ifmmode\pm\else\textpm\fi{}0.18\text{ }\text{ }\mathrm{MeV}$ with ${\ensuremath{\Gamma}}_{\mathrm{PDR}}=2.91\ifmmode\pm\else\textpm\fi{}0.64\text{ }\text{ }\mathrm{MeV}$ and at ${E}_{M1}=9.53\ifmmode\pm\else\textpm\fi{}0.06\text{ }\text{ }\mathrm{MeV}$ with ${\ensuremath{\Gamma}}_{M1}=2.70\ifmmode\pm\else\textpm\fi{}0.17\text{ }\text{ }\mathrm{MeV}$ in the Lorentzian function, respectively. The $B(E1)\ensuremath{\uparrow}$ value for pygmy dipole resonance over 7--11 MeV is $0.75\ifmmode\pm\else\textpm\fi{}0.08\text{ }\text{ }{e}^{2}\text{ }{\mathrm{fm}}^{2}$, which corresponds to $2.1\ifmmode\pm\else\textpm\fi{}0.2%$ of the Thomas-Reiche-Kuhn sum rule.

Published
2012
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14. Separation of pygmy dipole and M1 resonances in 90Zr by a high-resolution inelastic proton scattering near 0°

Author

C, Iwamoto, H, Utsunomiya, A, Tamii, H, Akimune, H, Nakada, T, Shima, T, Yamagata, T, Kawabata, Y, Fujita, H, Matsubara, Y, Shimbara, M, Nagashima, T, Suzuki, H, Fujita, M, Sakuda, T, Mori, T, Izumi, A, Okamoto, T, Kondo, B, Bilgier, H C, Kozer, Y-W, Lui, and K, Hatanaka

Abstract

A high-resolution measurement of inelastic proton scattering off (90)Zr near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E(PDR)=9.15±0.18 MeV with Γ(PDR)=2.91±0.64 MeV and at E(M1)=9.53±0.06 MeV with Γ(M1)=2.70±0.17 MeV in the Lorentzian function, respectively. The B(E1)↑ value for pygmy dipole resonance over 7-11 MeV is 0.75±0.08 e(2)fm(2), which corresponds to 2.1±0.2% of the Thomas-Reiche-Kuhn sum rule.

Published
2012

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

Author

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

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

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

Published
2012
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16. High-resolution (3He,t) reaction on the double-βdecaying nucleus136Xe

Author

H. C. Kozer, Hiroaki Matsubara, A. Lennarz, K. Miki, H. Ejiri, Hidetoshi Akimune, Y. Fujita, E. Ganioglu, M. Holl, Takashi Suzuki, T. Adachi, J. H. Lee, M. Fujiwara, Nori Aoi, J. H. Thies, Hisanori Fujita, S. E.A. Orrigo, D. Frekers, Mohsen Harakeh, P. Puppe, Atsushi Tamii, B. Bilgier, and Kichiji Hatanaka

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Scattering, Resolution (electron density), Nuclear physics, medicine.anatomical_structure, medicine, Beta (velocity), Atomic physics, Polyethylene naphthalate, Nucleus, Beam (structure), Energy (signal processing)
Abstract

A (${}^{3}\text{He},t$) charge-exchange reaction experiment on the double-beta decaying nucleus ${}^{136}$Xe has been performed at an incident energy of 420 MeV with the objective to measure the Gamow-Teller (GT) strength distribution in ${}^{136}$Cs. The measurements have been carried out at the dispersion-matched WS beam line and the Grand Raiden spectrometer of the Research Center for Nuclear Physics in Osaka, where an energy resolution of 42 keV was achieved. A new gas cell with thin windows made of polyethylene naphthalate has been employed as a target. The extracted GT strength distribution is confronted with the rather long $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay half-life of ${}^{136}$Xe.

Published
2011
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17. Gamow-Teller Transitions in Proton Rich Nuclei Deduced from the Combined Study of β-Decay and Charge-Exchange Reactions

Author

T. Adachi, R. B. Cakirli, T. Suzuki, C. Stodel, L. Cáceres, J. C. Thomas, H. C. Kozer, S. E. A. Orrigo, T. Kurtukian-Nieto, F. Molina, J. Giovinazzo, M. Gerbaux, B. Rubio, A. Algora, L. Kucuk, L. Popescu, W. Gelletly, Yoshitaka Fujita, G. Susoy, A. M. Rogers, Atsushi Tamii, B. Bilgier, H. Fujita, B. Blank, E. Ganioglu, P. Ascher, S. Grévy, J. Agramunt, O. Kamalou, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H. Otsu, T. Motobayashi, P. Roussel-Chomaz, T. Otsuka, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Proton, β decay, charge-exchange reaction, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Gamow-Teller transition, ComputingMilieux_MISCELLANEOUS, Charge exchange
Abstract

International audience

Published
2011
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18. Beta decay of exoticTZ= -1, -2 nuclei: the interesting case of56Zn

Author

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

Subjects
Physics, Silicon, Isotope, 010308 nuclear & particles physics, QC1-999, Gamma ray, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Beta decay, Ion, chemistry, Fragmentation (mass spectrometry), 0103 physical sciences, Proton emission, Atomic physics, Nuclear Experiment, 010306 general physics, Fermi Gamma-ray Space Telescope
Abstract

The β decay properties of the Tz = -2, 56 Zn isotope and other proton-rich nuclei in the fp-shell have been investigated in an experiment performed at GANIL. The ions were produced in fragmentation reactions and implanted in a double-sided silicon strip detector surrounded by Ge EXOGAM clovers. Preliminary results for 56 Zn are presented. The 56 Zn decay proceeds mainly by β delayed proton emission, but β delayed gamma rays were also detected. Moreover, the exotic β delayed gamma-proton decay was observed for the first time. The 56 Zn half-life and the energy levels populated in the 56 Cu daughter have been determined. Knowledge of the gamma de-excitation of the mirror states in 56 Co and the comparison with the results of the mirror charge exchange process, the 56 Fe( 3 He,t) reaction (where 56 Fe has Tz = +2), were important in the interpretation of the 56 Zn decay data. The absolute Fermi and Gamow-Teller strengths have been deduced.

Published
2014
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19. Observation of the β-delayed γ-proton decay of (56)Zn and its impact on the Gamow-Teller strength evaluation.

Author

Orrigo SE, Rubio B, Fujita Y, Blank B, Gelletly W, Agramunt J, Algora A, Ascher P, Bilgier B, Cáceres L, Cakirli RB, Fujita H, Ganioğlu E, Gerbaux M, Giovinazzo J, Grévy S, Kamalou O, Kozer HC, Kucuk L, Kurtukian-Nieto T, Molina F, Popescu L, Rogers AM, Susoy G, Stodel C, Suzuki T, Tamii A, and Thomas JC

Abstract

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

Published
2014
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20. Separation of pygmy dipole and M1 resonances in 90Zr by a high-resolution inelastic proton scattering near 0°.

Author

Iwamoto C, Utsunomiya H, Tamii A, Akimune H, Nakada H, Shima T, Yamagata T, Kawabata T, Fujita Y, Matsubara H, Shimbara Y, Nagashima M, Suzuki T, Fujita H, Sakuda M, Mori T, Izumi T, Okamoto A, Kondo T, Bilgier B, Kozer HC, Lui YW, and Hatanaka K

Abstract

A high-resolution measurement of inelastic proton scattering off (90)Zr near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7-12 MeV. A multipole decomposition analysis of the angular distribution for the forest was carried out using the ECIS95 distorted-wave Born approximation code with the Hartree-Fock plus random-phase approximation model of E1 and M1 transition densities and inclusion of E1 Coulomb excitation. The analysis separated pygmy dipole and M1 resonances in the forest at E(PDR)=9.15±0.18 MeV with Γ(PDR)=2.91±0.64 MeV and at E(M1)=9.53±0.06 MeV with Γ(M1)=2.70±0.17 MeV in the Lorentzian function, respectively. The B(E1)↑ value for pygmy dipole resonance over 7-11 MeV is 0.75±0.08 e(2)fm(2), which corresponds to 2.1±0.2% of the Thomas-Reiche-Kuhn sum rule.

Published
2012
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