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28 results on '"A. Montaner-Pizá"'

1. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., Ministry of Innovation and Technology (Hungary), Agencia Nacional de Investigación y Desarrollo (Chile), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, 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 (UB)-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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, QRPA calculations, Kr, Pseudo-SU(4) symmetry, pn pairing, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay of, 70, GT strength distribution, Beta decay of Kr 70 | GT strength distribution | pn pairing | Pseudo-SU(4) symmetry | QRPA calculations
Abstract

8 pags., 4 figs., 1 tab., 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., This work was supported by the National Research, Development and Innovation Fund of the Ministry for Innovation and Technology, Hungary with project no. TKP2021-NKTA-42 under the TKP2021 funding scheme. FM acknowledges the support of ANID/FONDECYT Regular 1171467 and ANID/FONDECYT Regular 1221364 national projects. This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish MICINN grants FPA2014-52823-C2-1-P, FPA2017- 83946-C2-1-P (MCIU/AEI/FEDER); Ministerio de Ciencia e Innovación grant PID2019-104714GB-C21; Centro de Excelencia Severo Ochoa del IFIC SEV-2014-0398; Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE, by NKFIH (NN128072), the National Research, Development and Innovation Fund of Hungary Project No. K 128729 the STFC (UK) through Grant No. ST/P005314/, the PROMETEO/2019/007 project and by the ÚNKP-20-5-DE-02 New National Excellence Program of the Ministry of Human Capacities of Hungary and by the JSPS KAKENHI of Japan (Grant No. 25247045). G.G. Kiss acknowledges support from the János Bolyai research fellowship of the Hungarian Academy of Sciences. A. A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955) P. S. acknowledges support from MCI/AEI/FEDER,UE (Spain) under grant PGC2018-093636-B-I00.

Published
2022

2. $\beta$ decay of the very neutron-deficient $^{60}$Ge and $^{62}$Ge nuclei

Author

Orrigo, S.E.A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A.I., Agramunt, J., Ahn, D.S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R.B., Chiba, J., De Angelis, G., De France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioğlu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grévy, S., Guadilla, V., Inabe, N., Kiss, G.G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Pizá, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Shimizu, Y., Sidong, C., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Vi, P., Wu, J., Yagi, S., 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
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, Nuclear Experiment
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., Comment: 13 pages, 12 figures, 5 tables. Physical Review C 103, 014324 (2021)

Published
2021

3. Impact of shell evolution on Gamow-Teller β decay from a high-spin long-lived isomer in 127Ag

Author

Hirofumi Watanabe, Young-Ki Kim, Chang-Bum Moon, A. Jungclaus, Younghun Kwon, A. Montaner-Pizá, Anna Wendt, Shunji Nishimura, Hiroshi Suzuki, F. Naqvi, Megumi Niikura, K. Yoshinaga, Ayumi Yagi, Z. H. Li, G. J. Lane, Giuseppe Lorusso, Hyo Soon Jung, F. Browne, D. Kameda, Hiroki Nishibata, Gary Simpson, P. Doornenbal, K. Steiger, Guillaume Gey, T. Isobe, F. G. Kondev, I. Kojouharov, Toshiyuki Sumikama, Zs. Vajta, R. Orlandi, Toshiyuki Kubo, Hiroyuki Takeda, Naohito Inabe, Atsuko Odahara, Jin Wu, G. D. Kim, H.K. Wang, Jan Taprogge, Roman Gernhäuser, G. Benzoni, F. C. L. Crespi, H. Schaffner, K. Moschner, H. Baba, Naoki Fukuda, Zs. Podolyák, K. Y. Chae, N. Kurz, Zhengyu Xu, P. A. Söderström, Daiki Nishimura, Hiroyoshi Sakurai, Zena Patel, Cenxi Yuan, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Ministry of Science and Technology (South Korea), Department of Energy (US), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Federal Ministry of Education and Research (Germany), Japan Society for the Promotion of Science, National Natural Science Foundation of China, National Key Research and Development Program (China), and Science and Technology Facilities Council (UK)

Subjects
Nuclear and High Energy Physics, QC1-999, Nuclear Theory, Shell (structure), Shell evolution, Ag, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, decay, Gamow-Teller, 0103 physical sciences, medicine, Physics::Atomic and Molecular Clusters, Neutron, 010306 general physics, Spin (physics), Physics, 010308 nuclear & particles physics, Gamow-Teller β decay, Parity (physics), 127Ag, ddc, Isomer, medicine.anatomical_structure, 13. Climate action, Atomic nucleus, 127 Ag, Atomic physics, Radioactive isotope beam, Nucleus, Excitation
Abstract

6 pags., 4 figs., 2 tabs., The change of the shell structure in atomic nuclei, so-called “nuclear shell evolution”, occurs due to changes of major configurations through particle-hole excitations inside one nucleus, as well as due to variation of the number of constituent protons or neutrons. We have investigated how the shell evolution affects Gamow-Teller (GT) transitions that dominate the β decay in the region below 132Sn using the newly obtained experimental data on a long-lived isomer in 127Ag. The T1/2=67.5(9) ms isomer has been identified with a spin and parity of (27/2+) at an excitation energy of 1942−20+14 keV, and found to decay via an internal transition of an E3 character, which competes with the dominant β-decay branches towards the high-spin states in 127Cd. The underlying mechanism of a strong GT transition from the 127Ag isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach., Part of the WAS3ABi was supported by the Rare Isotope Science Project which is funded by MSIP and NRF of Korea. This work was supported by the Priority Centers Research Program in Korea (2009-0093817), OTKA contract number K100835, the U.S. DOE, Office of Nuclear Physics (Contract No. DE-AC02-06CH11357), NRF2016R1A5A1013277 and NRF-2013M7A1A1075764, the Spanish Ministerio de Economía y Competitividad under contract FPA2017- 84756-C4-2-P, the European Commission through the Marie Curie Actions call FP7-PEOPLE-2011-IEF (Contract No. 300096), German BMBF under Contract No: 05P12PKFNE, JSPS KAKENHI Grant No. 24740188 and 25247045, the National Natural Science Foundation of China (Nos. 11505302, 11575112, 11775316), the National Key Program for S&T Research and Development (No. 2016YFA0400501), and STFC (UK).

Published
2021

4. Evolution of proton single-particle states in neutron-rich Sb isotopes beyond N=82

Author

A. Jungclaus, Y. Shimizu, H. Schaffner, Hiroshi Suzuki, T. Isobe, I. Kojouharov, Hiroshi Watanabe, G. D. Kim, J. M. Daugas, Hiroki Nishibata, Jinguang Wu, Hiroyoshi Sakurai, D. Kameda, Toshiyuki Kubo, Shunji Nishimura, A. Gargano, Gary Simpson, P. Doornenbal, Atsuko Odahara, H. Baba, K. Moschner, Roman Gernhäuser, F. Browne, Z. H. Li, Z Vajta, Ayumi Yagi, Naohito Inabe, S. Bönig, Marcus Scheck, Guillaume Gey, T. Kröll, K. Yoshinaga, S. Ilieva, N. Kurz, Jan Taprogge, Naoki Fukuda, K. Steiger, Hyo Soon Jung, R. Orlandi, J. M. Keatings, Young-Ki Kim, P. A. Söderström, Younghun Kwon, A. Montaner-Pizá, Giuseppe Lorusso, Anna Wendt, D. Mücher, Toshiyuki Sumikama, Hiroyuki Takeda, H. Naïdja, Zhengyu Xu, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ILL, RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), and National Research, Development and Innovation Office (Hungary)

Subjects
Physics, Proton, Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, Neutron number, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Excitation
Abstract

11 pags., 8 figs., 2 tabs., The β decay of the semimagic Sn isotopes Sn136,137,138 has been studied at the Radioactive Isotope Beam Factory at the RIKEN Nishina Center. The first experimental information on excited states was obtained for Sb137 while, in the case of Sb136, the established excitation scheme could be extended by ten previously unidentified levels. In the decay of the most-neutron-rich isotope Sn138, two γ rays were observed for the first time. The new experimental results, in combination with state-of-the-art shell-model calculations, provide the first information with respect to the evolution of the 0g7/2 and 1d5/2 proton single-particle states with increasing neutron number beyond N=84., We thank the staff of the RIKEN Nishina Center accelerator complex for providing high-intensity beams to the experiment. This work was supported by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2014-57196-C5-4-P and FPA2017-84756-C4-2-P and the UK Science and Technology Facilities Council under Grant No. ST/P005101/1. Zs.V. was supported by the European Regional Development Fund (Contract No. GINOP-2.3.3- 15-2016-00034), the National Research Development and Innovation Fund of Hungary (Grant No. K128947), and by RIKEN as short-term International Program Associate.

Published
2020

5. Studying the Exotic Decay $^{70}Kr$ $\rightarrow$ $^{70}Br$

Author

Daiki Nishimura, G. de Angelis, Hiroyoshi Sakurai, Y. Shimizu, P. A. Söderström, Shunji Nishimura, S. Yagi, C. Magron, J. Agramunt, V. Guadilla, JJ Liu, H. Oikawa, S. M. Lenzi, Y. Takei, N. Kurz, W. Gelletly, S. Chen, A. I. Morales, F. Recchia, E. Ganioglu, J. Giovinazzo, H. Baba, Y. Fujita, V. H. Phong, Gabor Kiss, F. Diel, T. Goigoux, H. Suzuki, D. S. Ahn, Zs. Dombradi, T. Kurtukian Nieto, Jin Wu, P. Aguilera, J. Eberth, N. Fukuda, Jenny Lee, B. Rubio, F. Molina, T. Isobe, P. J. Davies, I. Kojouharov, P. Ascher, M. Tanaka, Alejandro Algora, Naohito Inabe, B. Blank, Toshiyuki Sumikama, Hiroyuki Takeda, S. E.A. Orrigo, P. Doornebal, A. Montaner-Pizá, D. Lubos, C. Borcea, D. R. Napoli, M. Gerbaux, H. Shaffner, S. Grévy, W. Korten, A. Horvath, Toshiyuki Kubo, A. Boso, Shigeru Kubono, A. Vitez-Sveiczer, T. Lokotko, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
2020

6. Determination of β -decay ground state feeding of nuclei of importance for reactor applications

Author

V. Vedia, Sami Rinta-Antila, Volker Sonnenschein, D. Jordan, T. Martinez, Muriel Fallot, V. Guadilla, W. Gelletly, Amanda Porta, A. A. Sonzogni, Dmitry Gorelov, L. M. Fraile, A. Montaner-Pizá, Ari Jokinen, L. Le Meur, José Antonio Briz, Juha Äystö, T. Shiba, A. Cucoanes, A.-A. Zakari-Issoufou, K. Rytkönen, Jukka Koponen, Heikki Penttilä, Iain Moore, Anu Kankainen, S. E. A. Orrigo, Enrique Nácher, Veli Kolhinen, Annika Voss, Ilkka Pohjalainen, Tommi Eronen, E. Valencia, Berta Rubio, Jani Hakala, M. Lebois, Juuso Reinikainen, J. N. Wilson, M. Reponen, M. Monserrate, E. Ganioglu, M. Estienne, Jorge Agramunt, J. L. Tain, Alejandro Algora, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Generalitat Valenciana, Consejo Superior de Investigaciones Científicas (España), Science and Technology Facilities Council (UK), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Work (thermodynamics), Fission products, 010308 nuclear & particles physics, Nuclear structure, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, 7. Clean energy, 01 natural sciences, Synthetic data, Nuclear physics, 13. Climate action, Robustness (computer science), 0103 physical sciences, Neutron, High Energy Physics::Experiment, Decay heat, Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, Nuclear Experiment
Abstract

12 pags., 6 figs., 3 tabs., In β-decay studies the determination of the decay probability to the ground state (g.s.) of the daughter nucleus often suffers from large systematic errors. The difficulty of the measurement is related to the absence of associated delayed γ -ray emission. In this work we revisit the 4π γ − β method proposed by Greenwood and collaborators in the 1990s, which has the potential to overcome some of the experimental difficulties. Our interest is driven by the need to determine accurately the β-intensity distributions of fission products that contribute significantly to the reactor decay heat and to the antineutrinos emitted by reactors. A number of such decays have large g.s. branches. The method is relevant for nuclear structure studies as well. Pertinent formulas are revised and extended to the special case of β-delayed neutron emitters, and the robustness of the method is demonstrated with synthetic data. We apply it to a number of measured decays that serve as test cases and discuss the features of the method. Finally, we obtain g.s. feeding intensities with reduced uncertainty for four relevant decays that will allow future improvements in antineutrino spectrum and decay heat calculations using the summation method., This work has been supported by the Spanish Ministerio de Economía y Competitividad under Grants No. FPA2011- 24553, No. AIC-A-2011-0696, No. FPA2014-52823-C2- 1-P, No. FPA2015-65035-P, No. FPI/BES-2014-068222, No. FPA2017-83946-C2-1-P, and No. RTI2018-098868-BI00 and the program Severo Ochoa (SEV-2014-0398); by the Spanish Ministerio de Educación under Grant No. FPU12/01527; by the Spanish Ministerio de Ciencia e Innovación under Grant No. PID2019-104714GB-C21; by the European Commission under CHANDA project funded under FP7-EURATOM-FISSION Grant No. 605203; the FP7/ENSAR Contract No. 262010; the SANDA project funded under H2020-EURATOM-1.1 Grant No. 847552; the Horizon 2020 research and innovation programme under Grant No. 771036 (ERC CoG MAIDEN); by the Generalitat Valenciana regional funds PROMETEO/2019/007/; and by the Junta para la Ampliacion de Estudios ´ Programme (CSIC JAE-Doc contract) co-financed by ESF. We acknowledge the support of the UK Science and Technology Facilities Council (STFC) Grant No. ST/P005314/1; of the Polish National Agency for Academic Exchange (NAWA) under Grant No. PPN/ULM/2019/1/00220; and of the National Science Center, Poland, under Contract No. 2019/35/D/ST2/02081. This work was also supported by the Academy of Finland under the Finnish Centre of Excellence Programme (Project No. 213503, Nuclear and Accelerator-Based Physics Research at JYFL). A.K. and T.E. acknowledge support from the Academy of Finland under Projects No. 275389 and No. 295207, respectively. This work has also been supported by the CNRS challenge NEEDS and the associated NACRE project, the CNRS/in2p3 PICS TAGS between Subatech and IFIC, and the CNRS/in2p3 Master projects Jyvaskyla and OPALE.

Published
2020

7. Determination of beta-delayed neutron emission probability limits of rhodium isotopes by gamma-ray spectroscopy

Author

Shunji Nishimura, Naohito Inabe, Roman Gernhäuser, A. Boso, Z. H. Li, T. Isobe, Toshiyuki Kubo, H. Baba, F. G. Kondev, H. Schaffner, Megumi Niikura, Gary Simpson, G. Benzoni, F. C. L. Crespi, Hirofumi Watanabe, Zs. Vajta, Anna Wendt, Y. Shimizu, Atsuko Odahara, Jinguang Wu, A. Jungclaus, Hiroyoshi Sakurai, Hiroshi Suzuki, R. Orlandi, I. Kajouharov, Hyo Soon Jung, Zhengyu Xu, F. Browne, K. Yoshinaga, Jan Taprogge, Toshiyuki Sumikama, Guillaume Gey, Hiroyuki Takeda, P. H. Regan, G. J. Lane, Giuseppe Lorusso, Zena Patel, G. D. Kim, K. Moschner, S. Shibagaki, Bradley S. Meyer, R. Shearman, F. Naqvi, D. Kameda, Ayumi Yagi, P. Doornenbal, P. Schury, K. Steiger, Toshitaka Kajino, Young-Ki Kim, P. A. Söderström, Younghun Kwon, A. Montaner-Pizá, K. Y. Chae, N. Kurz, Naoki Fukuda, Zs. Podolyák, Hiroki Nishibata, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Science and Technology Facilities Council (UK), Department for Business, Energy and Industrial Strategy (UK), National Measurement System (UK), and Department of Energy (US)

Subjects
Paper, History, Fission, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Education, Nuclear physics, 0103 physical sciences, Gamma spectroscopy, Nuclear drip line, Nuclide, 010306 general physics, Nuclear Experiment, Physics, Isotope, 010308 nuclear & particles physics, 3. Good health, Computer Science Applications, ddc, chemistry, Physics::Accelerator Physics, Beryllium, Delayed neutron
Abstract

9 pags., 5 figs., 5 tabs. -- 27th International Nuclear Physics Conference (INPC2019) 29 July - 2 August 2019, Glasgow, UK, The decay of five neutron-heavy rhodium isotopes were studied at the Radioactive Isotope Beam Factory (RIBF) Facility at the RIKEN Nishina Center after relativistic fission of 238U beam on a thick beryllium target. Previously unknown associated gamma-ray decay energies are reported for each nuclide, and through evaluating the intensity of the 2+ → 0+ E2 transition in the even-even palladium daughter nuclei, 120,122,124Pd, from the beta-tagged gamma-ray spectra an upper or lower limit of beta-delayed neutron emission is deduced for each nuclei. A general, expected trend of increasing Pn is observed in the direction of the neutron drip line., This work was partially supported by the STFC UK (grant numbers ST/L005743/1 and ST/P005314) and UK Department of Business, Energy and Industrial Strategy (BEIS) via the National Measurement System. RS thanks the Nuclear Decommissioning Authority (NDA) for the award of an NDA Bursary. FGK acknowledges funding by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.

Published
2019

8. New isomers in $^{125}$Pd$_{79}$ and $^{127}$Pd$_{81}$: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the $N = 82$ shell closure

Author

Gary Simpson, Naohito Inabe, Hirofumi Watanabe, G. D. Kim, Chang-Bum Moon, A. Jungclaus, Ayumi Yagi, Megumi Niikura, Toshiyuki Sumikama, T. Isobe, Hiroshi Suzuki, Toshiyuki Kubo, Hyo Soon Jung, Shunji Nishimura, Hiroyuki Takeda, Atsuko Odahara, Jan Taprogge, G. Benzoni, F. C. L. Crespi, K. Yoshinaga, H. Baba, G. J. Lane, Giuseppe Lorusso, F. Browne, F. G. Kondev, I. Kojouharov, Guillaume Gey, H.K. Wang, Roman Gernhäuser, R. Orlandi, Z. H. Li, Hiroki Nishibata, Anna Wendt, H. Schaffner, Zs. Vajta, Zhengyu Xu, Young-Ki Kim, Younghun Kwon, A. Montaner-Pizá, Hiroyoshi Sakurai, Zena Patel, Daiki Nishimura, Yang Sun, Jin Wu, K. Moschner, K. Steiger, Naoki Fukuda, D. Kameda, Zs. Podolyák, P. A. Söderström, P. Doornenbal, F. Naqvi, K. Y. Chae, N. Kurz, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Proton, 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, lcsh:QC1-999, chemistry, Nucleosynthesis, Excited state, 0103 physical sciences, Neutron, Nuclide, Atomic physics, 010306 general physics, Nuclear Experiment, lcsh:Physics, Palladium
Abstract

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in Pd and Pd studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2 ) and (19/2 ) in Pd and Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus Sn.

Published
2019

9. Total absorption $\gamma$-ray spectroscopy of the $\beta$-delayed neutron emitters $^{137}$I and $^{95}$Rb

Author

Guadilla, V., Tain, J. L., Algora, A., Agramunt, J., Jordan, D., Monserrate, M., Montaner-Pizá, A., Nácher, E., Orrigo, S. E. A., Rubio, B., Valencia, E., Estienne, M., Fallot, M., Meur, L. Le, Briz, J. A., Cucoanes, A., Porta, A., Shiba, T., Zakari-Issoufou, A. -A., Sonzogni, A. A., Äystö, J., Eronen, T., Gorelov, D., Hakala, J., Jokinen, A., Kankainen, A., Kolhinen, V. S., Koponen, J., Moore, I. D., Penttilä, H., Pohjalainen, I., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rytkönen, K., Sonnenschein, V., Voss, A., Fraile, L. M., Vedia, V., Ganioğlu, E., Gelletly, W., Lebois, M., Wilson, J. N., Martinez, T., Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

The decays of the $\beta$-delayed neutron emitters $^{137}$I and $^{95}$Rb have been studied with the total absorption $\gamma$-ray spectroscopy technique. The purity of the beams provided by the JYFLTRAP Penning trap at the ion guide isotope separator on-line facility in Jyv\"askyl\"a allowed us to carry out a campaign of isotopically pure measurements with the decay total absorption $\gamma$-ray spectrometer, a segmented detector composed of eighteen NaI(Tl) modules. The contamination coming from the interaction of neutrons with the spectrometer has been carefully studied, and we have tested the use of time differences between prompt $\gamma$-rays and delayed neutron interactions to eliminate this source of contamination. Due to the sensitivity of our spectrometer, we have found a significant amount of $\beta$-intensity to states above the neutron separation energy that de-excite by $\gamma$-rays, comparable to the neutron emission probability. The competition between $\gamma$ de-excitation and neutron emission has been compared with Hauser-Feshbach calculations, and it can be understood as a nuclear structure effect. In addition, we have studied the impact of the $\beta$-intensity distributions determined in this work on reactor decay heat and reactor antineutrino spectrum summation calculations. The robustness of our results is demonstrated by a thorough study of uncertainties, and with the reproduction of the spectra of the individual modules and the module-multiplicity gated spectra. This work represents the state-of-the-art of our analysis methodology for segmented total absorption spectrometers.

Published
2019

10. Total absorption γ -ray spectroscopy of niobium isomers

Author

Ilkka Pohjalainen, A. Montaner-Pizá, Tommi Eronen, Dmitry Gorelov, E. Valencia, M. Monserrate, José Antonio Briz, B. Rubio, V. Vedia, Iain Moore, Sami Rinta-Antila, Anu Kankainen, S. E. A. Orrigo, V. Guadilla, Jani Hakala, Muriel Fallot, W. Gelletly, Juha Äystö, D. Jordan, Mikael Reponen, A.-A. Zakari-Issoufou, Heikki Penttilä, L. M. Fraile, J. L. Tain, A. A. Sonzogni, Pedro Sarriguren, Annika Voss, Volker Sonnenschein, Jorge Agramunt, A. Cucoanes, Jukka Koponen, E. Ganioglu, Enrique Nácher, M. Estienne, T. Martinez, M. Lebois, Amanda Porta, J. N. Wilson, T. Shiba, K. Rytkönen, V. Kolhinen, Ari Jokinen, L. Le Meur, A. Algora, Juuso Reinikainen, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Consejo Superior de Investigaciones Científicas (España), European Science Foundation, Science and Technology Facilities Council (UK), Academy of Finland, International Atomic Energy Agency, Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
spektroskopia, Niobium, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Decay heat, 010306 general physics, Spectroscopy, Absorption (electromagnetic radiation), Nuclear Experiment, Physics, Zirconium, Spectrometer, 010308 nuclear & particles physics, Pandemonium effect, Penning trap, nuclear structure and decays, chemistry, 13. Climate action, Física nuclear, beta decay, Atomic physics, isomer decays, ydinfysiikka
Abstract

15 pags. 17 figs., 5 tabs., The β-intensity distributions of the decays of Nb100gs,100m and Nb102gs,102m have been determined using the total absorption γ-ray spectroscopy technique. The JYFLTRAP double Penning trap system was employed in a campaign of challenging measurements performed with the decay total absorption γ-ray spectrometer at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. Different strategies were applied to disentangle the isomeric states involved, lying very close in energy. The low-spin component of each niobium case was populated through the decay of the zirconium parent, which was treated as a contaminant. We have applied a method to extract this contamination, and additionally we have obtained β-intensity distributions for these zirconium decays. The β-strength distributions evaluated with these results were compared with calculations in a quasiparticle random-phase approximation, suggesting a prolate configuration for the ground states of Zr100,102. The footprint of the Pandemonium effect was found when comparing our results for the analyses of the niobium isotopes with previous decay data. The β-intensities of the decay of Nb102m, for which there were no previous data, were obtained. A careful evaluation of the uncertainties was carried out, and the consistency of our results was validated taking advantage of the segmentation of our spectrometer. The final results were used as input in reactor summation calculations. A large impact on antineutrino spectrum calculations was already reported, and here we detail the significant impact on decay heat calculations., This work has been supported by the Spanish Ministerio de Economía y Competitividad under Grants No. FPA2011- 24553, No. AIC-A-2011-0696, No. FPA2014-52823-C2-1- P, No. FPA2015-65035-P, No. FPI/BES-2014-068222, No. FPA2017-83946-C2-1-P, and the program Severo Ochoa (SEV-2014-0398), by the Spanish Ministerio de Educación under the FPU12/01527 Grant, by the European Commission under the FP7/EURATOM Contract No. 605203 and the FP7/ENSAR Contract No. 262010, and by the Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by ESF. We acknowledge the support of the UK Science and Technology Facilities Council (STFC) Grant No. ST/P005314/1. This work was also supported by the Academy of Finland under the Finnish Centre of Excellence Programme (Project No. 213503, Nuclear and AcceleratorBased Physics Research at JYFL). The authors thank the IAEA for supporting and encouraging the work in this field.

Published
2019

11. Proton Shell Evolution below $^{132}\mathrm{Sn}$: First Measurement of Low-Lying $\beta$-Emitting Isomers in $^{123,125}\mathrm{Ag}$

Author

Chen, Z.Q., Li, Z.H., Hua, H., Watanabe, H., Yuan, C.X., Zhang, S.Q., Lorusso, G., Nishimura, S., Baba, H., Browne, F., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Doornenbal, P., Fukuda, N., Gey, G., Gernhäuser, R., Inabe, N., Isobe, T., Jiang, D.X., Jungclaus, A., Jung, H.S., Jin, Y., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Li, X.Q., Lou, J.L., Lane, G.J., Li, C.G., Luo, D.W., Montaner-Pizá, A., Moschner, K., Niu, C.Y., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sumikama, T., Söderström, P.A., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Suzuki, H., Taprogge, J., Takeda, H., Vajta, Zs., Wang, H.K., Wu, J., Wendt, A., Wang, C.G., Wu, H.Y., Wang, X., Wu, C.G., Xu, C., Xu, Z.Y., Yagi, A., Ye, Y.L., Yoshinaga, K., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics
Abstract

International audience; The β-delayed γ-ray spectroscopy of neutron-rich Ag123,125 isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2− β-emitting isomers in Ag123,125 are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2+ and 1/2− levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art VMU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in Ag123,125. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around Ag123 can be well interpreted in terms of the monopole shift of the π1g9/2 orbitals mainly caused by the increasing occupation of ν1h11/2 orbitals.

Published
2019

12. Large Impact of the Decay of Niobium Isomers on the Reactor ${\overline{{\nu}}}_{e}$ Summation Calculations

Author

Guadilla, V., Algora, A., Tain, J.L., Estienne, Magali, Fallot, Muriel, Sonzogni, A.A., Agramunt, J., Äystö, J., Briz, J.A., Cucoanes, A., Eronen, T., Fraile, L.M., Ganioğlu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Jordan, D., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Le Meur, L., Martinez, T., Monserrate, M., Montaner-Pizá, A., Moore, I., Nácher, E., Orrigo, S.E.A., Penttilä, H., Pohjalainen, I., Porta, Amanda, Reinikainen, J., Reponen, M., Rinta-Antila, S., Rubio, B., Rytkönen, K., Shiba, T., Sonnenschein, V., Valencia, E., Vedia, V., Voss, A., Wilson, J.N., Zakari-Issoufou, A.A., Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Penning trap, energy: ground state, particle separator, antineutrino: nuclear reactor, semileptonic decay, antineutrino: energy spectrum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, niobium, experimental results, energy: transition, Nuclear Physics
Abstract

International audience; Even mass neutron-rich niobium isotopes are among the principal contributors to the reactor antineutrino energy spectrum. They are also among the most challenging to measure due to the refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions of Nb100gs,100m and Nb102gs,102m β decays have been determined using the total absorption γ-ray spectroscopy technique. The measurements were performed at the upgraded Ion Guide Isotope Separator On-Line facility at the University of Jyväskylä. Here, the double Penning trap system JYFLTRAP was employed to disentangle the β decay of the isomeric states. The new data obtained in this challenging measurement have a large impact in antineutrino summation calculations. For the first time the discrepancy between the summation model and the reactor antineutrino measurements in the region of the shape distortion has been reduced.

Published
2019

13. Beta decay of the Tz=-2 nucleus 64Se and its descendants

Author

B. Blank, H. Takeda, Toshiyuki Sumikama, E. Ganioglu, G. G. Kiss, A. Algora, P. Aguilera, DeukSoon Ahn, A. I. Morales, Shin-Ichiro Nishimura, A. Montaner-Pizá, F. Molina, Shigeru Kubono, Daiki Nishimura, G. de Angelis, J. Giovinazzo, F. Diel, R. B. Cakirli, J. Chiba, H. Oikawa, Yoshitaka Fujita, W. Gelletly, V. Guadilla, Jorge Agramunt, Berta Rubio, T. Kurtukian, Momoko Tanaka, C. Sidong, Yoshifumi R. Shimizu, Tomio Kubo, P. A. Söderström, P. Vi, N. Fukuda, Y. Takei, A. Boso, C. Borcea, Shintaro Go, Naohito Inabe, C. Magron, S. E. A. Orrigo, S. Grévy, D. Lubos, H. Suzuki, D. R. Napoli, M. Gerbaux, P. Doornenbal, S. Yang, P. Asher, Jinguang Wu, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
2018

14. Characterization and performance of the DTAS detector

Author

J. N. Wilson, M. Monserrate, K. Rytkönen, Ilkka Pohjalainen, D. Jordan, Stephen Rice, V. Guadilla, Annika Voss, A.-A. Zakari-Issoufou, M. Lebois, Juha Äystö, Mikael Reponen, Muriel Fallot, S.E.A. Orrigo, E. Ganioglu, Tommi Eronen, Ari Jokinen, A. A. Sonzogni, Jukka Koponen, L. Le Meur, Juuso Reinikainen, M. Estienne, Enrique Nácher, Heikki Penttilä, Volker Sonnenschein, L. M. Fraile, Jani Hakala, E. Valencia, A. Cucoanes, Iain Moore, Anu Kankainen, Veli Kolhinen, Dmitry Gorelov, A. Montaner-Pizá, Berta Rubio, W. Gelletly, J. A. Briz, T. Martinez, T. Shiba, Jorge Agramunt, Alejandro Algora, J. L. Tain, Amanda Porta, V. Vedia, Sami Rinta-Antila, European Commission, Science and Technology Facilities Council (UK), Istanbul University, Ministerio de Economía y Competitividad (España), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Nantes - Faculté des Sciences et des Techniques, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, spektrometrit, β decay, FOS: Physical sciences, Non-proportional scintillation light yield: Monte Carlo simulations, Monte Carlo simulations [Non-proportional scintillation light yield], y-ray spectrometer, B decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Monte Carlo simulations, Optics, Distortion, 0103 physical sciences, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment, Instrumentation, [formula omitted] decay, Physics, ta114, Spectrometer, 010308 nuclear & particles physics, business.industry, NaI(Tl) detector, Pulse generator, Total absorption [formula omitted]-ray spectrometer, Detector, non-proportional scintillation light yield, Instrumentation and Detectors (physics.ins-det), Total absorption γ -ray spectrometer, Non-proportional scintillation light yield, Física nuclear, Total absorption, ydinfysiikka, business, Delayed neutron, Exotic nuclei
Abstract

11 pags., 16 figs., 3 tabs., DTAS is a segmented total absorption γ-ray spectrometer developed for the DESPEC experiment at FAIR. It is composed of up to eighteen NaI(Tl) crystals. In this work we study the performance of this detector with laboratory sources and also under real experimental conditions. We present a procedure to reconstruct offline the sum of the energy deposited in all the crystals of the spectrometer, which is complicated by the effect of NaI(Tl) light-yield non-proportionality. The use of a system to correct for time variations of the gain in individual detector modules, based on a light pulse generator, is demonstrated. We describe also an event-based method to evaluate the summing-pileup electronic distortion in segmented spectrometers. All of this allows a careful characterization of the detector with Monte Carlo simulations that is needed to calculate the response function for the analysis of total absorption γ-ray spectroscopy data. Special attention was paid to the interaction of neutrons with the spectrometer, since they are a source of contamination in studies of β-delayed neutron emitting nuclei., This work has been supported by the Spanish Ministerio de Economia y Competitividad under grants FPA2011-24553, AIC-A-2011-0696, FPA2014-52823-C2-1-P and the program Severo Ochoa (SEV-2014-0398), by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educacion Cultura y Deporte under the FPU12/01527 grant. The work was also supported by the UK Science and Technology Facilities Council (STFC) grant 14 ST/P005314/1. E. Ganioglu was supported by the Istanbul University Scientic Research Project Unit under FYO-2017-24144 project.

Published
2018

15. Simultaneous investigation of the $\mathbf{T=1~ (J^{\pi}=0^+)}$ and $\mathbf{T=0 ~ (J^{\pi}=9^+)}$ $\beta$ decays in $^{70}$Br

Author

Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombrádi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grévy, S., Guadilla, V., Inabe, N., Isobe, T., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukián, Lenzi, S., Lubos, D., Magron, C., Montaner-Pizá, A., Napoli, D. R., Sakurai, H., Shimizu, Y., Sidong, C., Söderström, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Yagi, S., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

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

Published
2017

16. Characterization of a cylindrical plastic {\beta}-detector with Monte Carlo simulations of optical photons

Author

J. L. Tain, K. Rytkönen, W. Gelletly, Juha Äystö, A. Cucoanes, Mikael Reponen, Ari Jokinen, E. Ganioglu, Volker Sonnenschein, Juuso Reinikainen, Heikki Penttilä, S.E.A. Orrigo, D. Jordan, Tommi Eronen, Dmitry Gorelov, José Antonio Briz, M. Lebois, A. Porta, B. Rubio, Jorge Agramunt, T. Martinez, L. M. Fraile, M. Estienne, Jukka Koponen, Annika Voss, Enrique Nácher, J. N. Wilson, Iain Moore, V. Vedia, Sami Rinta-Antila, Anu Kankainen, T. Shiba, Veli Kolhinen, A.-A. Zakari-Issoufou, V. Guadilla, E. Valencia, M. Monserrate, M. Fallot, A. Algora, Jani Hakala, Ilkka Pohjalainen, A. Montaner-Pizá, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-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), Ministerio de Educación (España), European Commission, and Ministerio de Economía y Competitividad (España)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Photon, Total absorption spectroscopy, optical photons, Monte Carlo method, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Electromagnetic radiation, Monte Carlo simulations, Optics, 0103 physical sciences, Plastic scintillators, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], plastic scintillators, 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment, Instrumentation, Physics, Spectrometer, ta114, 010308 nuclear & particles physics, business.industry, Detector, total absorption spectroscopy, Computational physics, Optical photons, Dynamic Monte Carlo method, business
Abstract

V. Guadilla et al. -- 5 pags., 8 figs., tab., In this work we report on the Monte Carlo study performed to understand and reproduce experimental measurements of a new plastic β-detector with cylindrical geometry. Since energy deposition simulations differ from the experimental measurements for such a geometry, we show how the simulation of production and transport of optical photons does allow one to obtain the shapes of the experimental spectra. Moreover, taking into account the computational effort associated with this kind of simulation, we develop a method to convert the simulations of energy deposited into light collected, depending only on the interaction point in the detector. This method represents a useful solution when extensive simulations have to be done, as in the case of the calculation of the response function of the spectrometer in a total absorption γ-ray spectroscopy analysis., This work has been supported by the Spanish Ministerio de Economía y Competitividad under grants FPA2011-24553, AIC-A-2011-0696, FPA2014-52823-C2-1-P and the program Severo Ochoa (SEV-2014-0398), by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educación under the FPU12/01527 grant.

Published
2017

17. r Process (n, \(\gamma \)) Rate Constraints from the \(\gamma \) Emission of Neutron Unbound States in \(\beta \)-Decay

Author

Stephen Rice, Juho Rissanen, J. N. Wilson, Volker Sonnenschein, Viki-Veikko Elomaa, Muriel Fallot, A. Algora, Jani Hakala, E. Valencia, R. Caballero-Folch, P. J. R. Mason, Iain Moore, Anu Kankainen, S. E. A. Orrigo, F. G. Kondev, Veli Kolhinen, Juha Äystö, A. R. García, D. Cano-Ott, Mikael Reponen, L. Batist, Ari Jokinen, E. Ganioglu, J. L. Tain, M. Lebois, B. Gomez-Hornillos, L. Le Meur, Ilkka Pohjalainen, M. Estienne, M. D. Jordan, M. Monserrate, A. A. Sonzogni, A. Cucoanes, Tommi Eronen, Heikki Penttilä, Jukka Koponen, Enrique Nácher, E. Mendoza, E. Estevez, José Antonio Briz, Amanda Porta, V. Gorlychev, T. Martinez, Jorge Agramunt, Dmitry Gorelov, K. Rytkönen, Juuso Reinikainen, T. Shiba, P. H. Regan, M. Bowry, V. Vedia, B. Rubio, G. F. Farrelly, A.-A. Zakari-Issoufou, Zs. Podolyák, Sami Rinta-Antila, W. Gelletly, Annika Voss, L. M. Fraile, V. Guadilla, V. M. Bui, A. Montaner-Pizá, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, r-process, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

International audience; Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of γ emission from neutron-unbound states populated in the β-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission a constraint on the (n, γ) cross section for highly unstable neutron-rich nuclei can be deduced. A surprisingly large γ branching was observed for a number of isotopes which might indicate the need to increase by a large factor the Hauser-Feshbach (n, γ) cross-section estimates that impact on r process abundance calculations.

Published
2017

18. Half-life determination of T$_{z}$ = -1 and T$_{z}$ = - $ {\frac{{1}}{{2}}}$ proton-rich nuclei and the $ \beta$ decay of$^{58}$Zn

Author

Kucuk, L., Orrigo, S.E.A., Montaner-Pizá, A., Rubio, B., Fujita, Y., Gelletly, W., Blank, B., Oktem, Y., Adachi, T., Algora, A., Ascher, P., Cakirli, R.B., De France, G., Fujita, H., Ganioğlu, E., Giovinazzo, J., Grévy, S., Marqués, F.M., Molina, F., de Oliveira Santos, F., Perrot, L., Raabe, R., Srivastava, P.C., Susoy, G., Tamii, A., Thomas, J.C., 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 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), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; 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.

Published
2017

19. Observation of a $\gamma$-decaying millisecond isomeric state in $^{128}$Cd$_{80}$

Author

I. Kojouharov, Jan Taprogge, S. Ilieva, K. Moschner, A. Gargano, Hyo Soon Jung, Zhengyu Xu, P. A. Söderström, L. Coraggio, F. Naqvi, Ayumi Yagi, G. Benzoni, S. Bönig, Shunji Nishimura, Toshiyuki Sumikama, K. Yoshinaga, Zs. Vajta, Zena Patel, A. Jungclaus, Hiroyoshi Sakurai, Z. H. Li, G. D. Kim, F. Drouet, H. Grawe, N. Kurz, Hiroyuki Takeda, Young-Ki Kim, J. M. Daugas, T. Kröll, Younghun Kwon, F. Browne, G. J. Lane, Giuseppe Lorusso, A. Montaner-Pizá, R. Orlandi, H. Baba, H. Schaffner, Hiroshi Suzuki, Megumi Niikura, Nunzio Itaco, T. Isobe, D. Kameda, D. Mücher, Atsuko Odahara, F. G. Kondev, Guillaume Gey, Naoki Fukuda, P. Doornenbal, Hiroshi Watanabe, Zs. Podolyák, Jin Wu, K. Steiger, Hiroki Nishibata, Anna Wendt, K. Y. Chae, Naohito Inabe, Y. Shimizu, Gary Simpson, Toshiyuki Kubo, A. Gadea, Roman Gernhäuser, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Hungarian Scientific Research Fund, European Commission, Department of Energy (US), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, German Research Foundation, SCOAP, National Research Foundation of Korea, Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), RIKEN Nishina Center for Accelerator-Based Science, Japan Society for the Promotion of Science, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Jungclaus, A., Grawe, H., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Sã¶derstrã¶m, P. -. A., Sumikama, T., Taprogge, J., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhã¤user, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -. K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Z. S., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bã¶nig, S., Chae, K. Y., Coraggio, L., Daugas, J. -. M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Krã¶ll, T., Lane, G. J., Montaner-pizã¡, A., Moschner, K., Mã¼cher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyã¡k, Z. S., and Wendt, A.

Subjects
Shell model calculation, Nuclear and High Energy Physics, Fission, SHELL model, Nuclear Theory, Shell model calculations, Transition strengths, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 0103 physical sciences, medicine, ddc:530, 010306 general physics, Nuclear Experiment, Physics, Millisecond, Radionuclide, Isomeric decay, 010308 nuclear & particles physics, Projectile, Parity (physics), lcsh:QC1-999, medicine.anatomical_structure, Isomeric decays, Physics::Accelerator Physics, Transition strength, Atomic physics, Nucleus, lcsh:Physics
Abstract

A. Jungclaus et al. -- 6 pags., 5 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0, A new high-spin isomer in the neutron-rich nucleus Cd was populated in the projectile fission of a U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus Cd. In the present experiment no evidence was found for the decay of a 18 E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h and the 0g orbit, respectively, which is predicted to exist by the shell model., We thank the staff of the RIKEN Nishina Center accelerator complex for providing stable beams with high intensities to the experiment. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish Ministerio de Ciencia e Innovación under contract FPA2011-29854-C04 and the Spanish Ministerio de Economía y Competitividad under contract FPA2014-57196-C5-4-P, the Generalitat Valenciana (Spain) under grant PROMETEO/2010/101, the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2014S1A2A2028636, 2016K1A3A7A09005579, 2016R1A5A1013277), the Priority Centers Research Program in Korea (2009-0093817), OTKA contract number K-100835, JSPS KAKENHI (Grant No. 25247045), the European Commission through the Marie Curie Actions call FP7-PEOPLE-2011-IEF under Contract No. 300096, the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, the STFC (UK), the “RIKEN foreign research program”, the German BMBF (No. 05P12RDCIA, 05P12RDNUP and 05P12PKFNE), HIC for FAIR, the DFG cluster of excellence “Origin and Structure of the Universe” and DFG (Contract No. KR2326/2-1).

Published
2017

20. Experimental study of $^{100}$Tc $\beta$ decay with total absorption $\gamma$-ray spectroscopy

Author

Guadilla, V., Algora, A., Tain, J.L., Agramunt, J., Jordan, D., Montaner-Pizá, A., Orrigo, S.E.A., Rubio, B., Valencia, E., Suhonen, J., Civitarese, O., Äystö, J., Briz, J.A., Cucoanes, A., Eronen, T., Estienne, M., Fallot, M., Fraile, L.M., Ganioglu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Martinez, T., Monserrate, M., Moore, I., Nácher, E., Penttilä, H., Pohjalainen, I., Porta, A., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rytkönen, K., Shiba, T., Sonnenschein, V., Sonzogni, A.A., Vedia, V., Voss, A., Wilson, J.N., Zakari-Issoufou, A.-A, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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 subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), 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 ), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
density, molybdenum: double-beta decay, excited state: energy, total-absorption counter, random phase approximation: quasiparticle, technetium: semileptonic decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], benchmark, efficiency, gamma ray, ground state, spectrometer, branching ratio, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], numerical calculations, phonon, ruthenium, Monte Carlo, experimental results
Abstract

International audience; The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100.

Published
2017

21. TAGS measurements of $^{100}$Nb ground and isomeric states and $^{140}$Cs for neutrino physics with the new DTAS detector

Author

D. Jordan, Ilkka Pohjalainen, E. Ganioglu, Tommi Eronen, Muriel Fallot, W. Gelletly, M. Estienne, José Antonio Briz, M. Monserrate, Iain Moore, L. M. Fraile, Anu Kankainen, A. Algora, Jani Hakala, B. Rubio, A.-A. Zakari-Issoufou, Veli Kolhinen, Annika Voss, Volker Sonnenschein, Heikki Penttilä, V. Guadilla, J. N. Wilson, E. Valencia, Juuso Reinikainen, S.E.A. Orrigo, A. A. Sonzogni, A. Cucoanes, Jukka Koponen, Enrique Nácher, M. Lebois, Dmitry Gorelov, K. Rytkönen, Ari Jokinen, Jorge Agramunt, J. L. Tain, T. Martinez, A. Montaner-Pizá, V. Vedia, Sami Rinta-Antila, T. Shiba, Juha Äystö, Mikael Reponen, Amanda Porta, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., and Oberstedt, S.

Subjects
Physics, Fission products, ta114, Spectrometer, 010308 nuclear & particles physics, QC1-999, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear physics, nuclear masses, 0103 physical sciences, structure, decay data measurements, Neutrino, 010306 general physics, Spectroscopy, Absorption (electromagnetic radiation)
Abstract

V. Guadilla et al. -- 4 pags., 6 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, In this work we report on total absorption ¿-ray spectroscopy measurements of the ß decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the ß decay of 100Nb,100mNb and 140Cs are presented., This work has been supported by the Spanish Ministerio de Economía y Competitividad under the FPA2011-24553, the AIC-A-2011-0696, the FPA2014-52823-C2-1-P and the SEV- 2014-0398 Grants, by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educación under the FPU12/01527 Grant.

Published
2016

22. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

Author

T. Martinez, Muriel Fallot, E. Estevez, Iain Moore, J. N. Wilson, L. Batist, Anu Kankainen, W. Gelletly, Amanda Porta, Veli Kolhinen, A. Cucoanes, Alejandro Sonzogni, M. Bowry, Juuso Reinikainen, L. M. Fraile, F. G. Kondev, D. Cano-Ott, Jukka Koponen, V. Gorlychev, Pasi Karvonen, Michael Fleming, F. Molina, Enrique Nácher, E. Mendoza, J. A. Briz, A. Perez, A. Montaner-Pizá, Tommi Eronen, Dmitry Gorelov, Juha Äystö, Ari Jokinen, Mikael Reponen, Juho Rissanen, V. Guadilla, Annika Voss, B. Rubio, L. Le Meur, M. B. Gómez-Hornillos, P. J. R. Mason, E. Ganogliu, Volker Sonnenschein, Jorge Agramunt, V. Vedia, A.-A. Zakari-Issoufou, Sami Rinta-Antila, R. Caballero-Folch, C. Weber, P. H. Regan, J. L. Tain, M. Estienne, M. D. Jordan, M. Monserrate, M. Lebois, Heikki Penttilä, Viki-Veikko Elomaa, V. M. Bui, E. Valencia, Ilkka Pohjalainen, A. Algora, Jani Hakala, Stephen Rice, T. Shiba, S.E.A. Orrigo, A. R. García, Jean-Christophe Sublet, S. Cormon, G. F. Farrelly, Zs. Podolyák, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Plompen, A, Hambsch, FJ, Schillebeeckx, P, Mondelaers, W, Heyse, J, Kopecky, S, Siegler, P, Oberstedt, S, Helsinki Institute of Physics, Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), 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), Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., Oberstedt, S., Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Total absorption spectroscopy, Fission, QC1-999, CHOOZ, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 114 Physical sciences, Spectral line, law.invention, Physics::Geophysics, Nuclear physics, law, nuclear masses, 0103 physical sciences, structure, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Physics, Fission products, ta114, 010308 nuclear & particles physics, Pressurized water reactor, Nuclear data, Pandemonium effect, PRODUCTS, 13. Climate action, decay data measurements
Abstract

International audience; The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gamma-ray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary results on 142Cs and report on the measurements already performed.

Published
2016

23. New neutron-deficient isotopes from $^{78}$Kr fragmentation

Author

Shigeru Kubono, Daiki Nishimura, G. de Angelis, Y. Fujita, M. Gerbaux, Hiroyoshi Sakurai, C. Borcea, D. S. Ahn, J. Chiba, Shunji Nishimura, D. Lubos, C. Magron, D. R. Napoli, S. Yagi, H. Suzuki, B. Rubio, J. Agramunt, V. Guadilla, P. A. Söderström, P. Ascher, Toshiyuki Kubo, Naohito Inabe, Jin Wu, Y. Shimizu, H. Oikawa, J. Giovinazzo, Shintaro Go, A. Boso, W. Gelletly, Alejandro Algora, Kathrin Wimmer, F. Diel, Gabor Kiss, F. Molina, R. B. Cakirli, V. H. Phong, T. Kurtukian Nieto, Y. Takei, E. Ganioglu, S. Grévy, N. Fukuda, B. Blank, Toshiyuki Sumikama, P. Doornenbal, Hiroyuki Takeda, S. E.A. Orrigo, T. Goigoux, M. Tanaka, P. Aguilera, A. I. Morales, A. Montaner-Pizá, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

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

Published
2016

24. First observation of γ rays emitted from excited states south-east of Sn132: The πg−19/2⊗νf7/2 multiplet of In83132

Author

Jungclaus, A., Gargano, A., Grawe, H., Taprogge, J., Nishimura, S., Doornenbal, P., Lorusso, G., Shimizu, Y., Simpson, G.S., Söderström, P.-A., Sumikama, T., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y.-K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Bönig, S., Coraggio, L., Daugas, J.-M., Drouet, F., Gadea, A., Ilieva, S., Itaco, N., Kröll, T., Montaner-Pizá, A., Moschner, K., Mücher, D., Nishibata, H., Odahara, A., Orlandi, R., Wendt, A., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g−19/2⊗ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh−111/2⊗νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented.

Published
2016

25. First experiment with the NUSTAR/FAIR Decay Total Absorption γ-Ray Spectrometer (DTAS) at the IGISOL IV facility

Author

E. Valencia, M. Fallot, Ari Jokinen, A. Cucoanes, W. Gelletly, D. Cano-Ott, B. Rubio, A.-A. Zakari-Issoufou, Juha Äystö, Mikael Reponen, J. A. Briz, Dmitry Gorelov, Zs. Podolyák, V. Vedia, E. Ganioglu, J. L. Tain, Tommi Eronen, J. N. Wilson, Heikki Penttilä, Sami Rinta-Antila, M. Estienne, A. Porta, D. Jordan, E. Nacher, Iain Moore, Annika Voss, P. H. Regan, Anu Kankainen, V. Kolhinen, Jukka Koponen, S. E.A. Orrigo, T. Martinez, L. M. Fraile, K. Rytkönen, Juuso Reinikainen, M. Monserrate, M. Lebois, Volker Sonnenschein, A. Montaner-Pizá, J. Agramunt, V. Guadilla, Ilkka Pohjalainen, A. Algora, Jani Hakala, A. A. Sonzogni, T. Shiba, Ministerio de Economía y Competitividad (España), European Commission, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
SOL facilities, Nuclear and High Energy Physics, Analytical chemistry, β decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Total Absorption γ-Ray Spectrometer, total absorption gamma-ray spectrometer, 01 natural sciences, Nuclear physics, Low energy, 0103 physical sciences, 010306 general physics, Absorption (electromagnetic radiation), Instrumentation, beta-delayed neutron emitters, Spectrometer, ta114, 010308 nuclear & particles physics, Chemistry, Detector, 3. Good health, exotic nuclei, β-Delayed neutron emitters, ISOL facilities, beta decay, Exotic nuclei
Abstract

V. Guadilla et al. ; 4 págs.; 4 figs.; 1 tab., The new Decay Total Absorption Spectrometer (DTAS) has been commissioned with low energy radioactive beams at the upgraded IGISOL IV facility. The DTAS is a segmented detector composed of up to 18 NaI(Tl) crystals and it will be a key instrument in the DESPEC experiment at FAIR. In this document we report on the experimental setup and the first measurements performed with DTAS at IGISOL. The detector was characterized by means of MC simulations, and this allowed us to calculate the response function of the spectrometer and analyse the first cases of interest. 2015 Elsevier B.V. All rights reserved., This work has been supported by the Spanish Ministerio de Economía y Competitividad – Spain under the FPA2011-24553, the AIC-A-2011-0696, the FPA2014-52823-C2-1-P and the SEV-2014-0398 Grants, by the European Commission – Belgium under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educación – Spain under the FPU program.

Published
2015

26. Study of the $\beta $ Decay of Fission Products with the DTAS Detector

Author

Juha Äystö, Mikael Reponen, K. Rytkönen, Jorge Agramunt, Dmitry Gorelov, M. Monserrate, V. Kolhinen, T. Shiba, Ari Jokinen, Heikki Penttilä, M. Lebois, J. L. Tain, Ilkka Pohjalainen, V. Vedia, D. Jordan, Muriel Fallot, E. Ganioglu, Sami Rinta-Antila, J. N. Wilson, A. Cucoanes, A. Montaner-Pizá, Iain Moore, Anu Kankainen, E. Valencia, M. Estienne, T. Martinez, Jukka Koponen, Volker Sonnenschein, Enrique Nácher, S. E.A. Orrigo, Juuso Reinikainen, A. A. Sonzogni, V. Guadilla, B. Rubio, A.-A. Zakari-Issoufou, A. Algora, Jani Hakala, Tommi Eronen, José Antonio Briz, L. M. Fraile, Annika Voss, Amanda Porta, W. Gelletly, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Ministerio de Educación (España), Ministerio de Economía y Competitividad (España), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission products, ta114, 010308 nuclear & particles physics, Detector, General Physics and Astronomy, Beta decay, Total Absorption, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Total Absorption Spectroscopy, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Spectroscopy
Abstract

V. Guadilla et al. -- 5 pags., fig., tab., Total Absorption Spectroscopy measurements of the beta decay of Mo-103 and Tc-103, important contributors to the decay heat summation calculation in reactors, are reported in this work. The analysis of the experiment, performed at IGISOL with the new DTAS detector, show new beta intensity that was not detected in previous measurements with Ge detectors., This work has been supported by the Spanish Ministerio de Economía y Competitividad under the FPA2011-24553, the AIC-A-2011-0696, the FPA 2014-52823-C2-1-P and the SEV-2014-0398 grants, and by the Spanish Ministerio de Educación under the FPU12/01527 grant.

Published
2017

27. Shape evolution in 116,118Ru: Triaxiality and transition between the O(6) and U(5) dynamical symmetries

Author

Söderström, Pär-Anders, Lorusso, Giuseppe, Watanabe, Hiroshi, Nishimura, Shunji, Doornenbal, Pieter, Thiamova, G., Browne, Frank, Gey, Guillaume, Jung, H. S., Sumikama, Toshiyuki, Taprogge, Jan, Vajta, Zsolt, Wu, J., Xu, Z. Y., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, Naoki, Gernhäuser, R., Inabe, Naohiro, Isobe, Tadaaki, Jungclaus, A., Kameda, Daisuke, Kim, G. D., Kim, Y.-K., Kojouharov, I., Kondev, F. G., Kubo, Toshiyuki, Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, Hiroki, Odahara, Atsuko, Orlandi, R., Patel, Zena, Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, Hiroshi, Takeda, Hiroyuki, Wendt, A., Yagi, Ayumi, Yoshinaga, K., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Természettudományok, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2013

28. Isomer and beta decay spectroscopy in the132Sn region with EURICA

Author

A. Jungclaus, T. Isobe, Giuseppe Lorusso, J. M. Daugas, I. Kojouharov, Naohito Inabe, K. Yoshinaga, P. A. Söderström, D. Mücher, A. Montaner-Pizá, Zhengyu Xu, Hyo Soon Jung, Y. K. Kim, H. Suzuki, Hiroyoshi Sakurai, Anna Wendt, H. Baba, T. Kubo, Hiroki Nishibata, K. Moschner, G. D. Kim, Toshiyuki Sumikama, Gary Simpson, F. Browne, Young Kwan Kwon, Jinguang Wu, Guillaume Gey, S. Ilieva, Zs. Vajta, F. Drouet, Ayumi Yagi, H. Schaffner, S. Bönig, N. Fukuda, H. Takeda, Hiroshi Watanabe, S. Nishimura, D. Kameda, P. Doornenbal, K. Steiger, N. Kurz, Roman Gernhäuser, Z. H. Li, T. Kröll, Jan Taprogge, R. Orlandi, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia e Innovación (España), Lunardi, S, Bizzeti, PG, Kabana, S, Bucci, C, Chiari, M, Dainese, A, DiNezza, P, Menegazzo, R, Nannini, A, Signorini, C, and ValienteDobon, JJ

Subjects
Geography, Physics, QC1-999, Library science, Astronomy, Creative commons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Spectroscopy, 7. Clean energy, ComputingMilieux_MISCELLANEOUS
Abstract

A. Jungclaus et al.; 4 págs.; 1 fig.; Open Access funded by Creative Commons Atribution Licence 2.0, The first EURICA campaign with high intensity Uranium beams took place at RIKEN in November/December 2012. Within this campaign experiment NP1112-RIBF85 was performed dedicated to the study of the isomeric and beta decays of neutronrich Cd, In, Sn and Sb isotopes towards and beyond the N=82 neutron shell closure. In this contribution we present a first status report of the analysis of the extensive data set obtained in this experiment. C Owned by the authors, published by EDP Sciences, 2014, This work has been supported by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2009-13377-C02 and FPA2011-29854-C04.

Published
2014

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