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1. Impact of shell evolution on Gamow-Teller Decay From a High-spin Long-lived Isomer in Ag

Author

Watanabe, H., Yuan, C.X., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wang, H.K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Abstract

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 $^{132}$Sn using the newly obtained experimental data on a long-lived isomer in $^{127}$Ag. 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 $^{127}$Cd. The underlying mechanism of a strong GT transition from the $^{127}$Ag isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach.

Published
2021

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

Author

Watanabe, H., Yuan, C. X., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Soderstrom, P-A, Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs, Wang, H. K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I, Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C-B, Montaner-Piza, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs, Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., Yoshinaga, K., Watanabe, H., Yuan, C. X., Lorusso, G., Nishimura, S., Xu, Z. Y., Sumikama, T., Soderstrom, P-A, Doornenbal, P., Browne, F., Gey, G., Jung, H. S., Taprogge, J., Vajta, Zs, Wang, H. K., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K. Y., Crespi, F. C. L., Fukuda, N., Gernhauser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I, Kondev, F. G., Kubo, T., Kurz, N., Kwon, Y. K., Lane, G. J., Li, Z., Moon, C-B, Montaner-Piza, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs, Sakurai, H., Schaffner, H., Simpson, G. S., Steiger, K., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

Abstract

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 beta decay in the region below Sn-132 using the newly obtained experimental data on a long-lived isomer in Ag-127. The T-1/2 = 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 beta-decay branches towards the high-spin states in Cd-127. The underlying mechanism of a strong GT transition from the Ag-127 isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach. (C) 2021 The Authors. Published by Elsevier B.V.

Published
2021

3. New isomers in Pd And Pd : Competing proton and neutron excitations in neutron-rich palladium nuclides towards the = 82 Shell Closure

Author

Watanabe, H., Wang, H.K., Lorusso, G., Nishimura, S., Xu, Z.Y., Sumikama, T., Söderström, P.A., Doornenbal, P., Browne, F., Gey, G., Jung, H.S., Taprogge, J., Vajta, Zs., Wu, J., Yagi, A., Baba, H., Benzoni, G., Chae, K.Y., Crespi, F.C.L., Fukuda, N., Gernhäuser, R., Inabe, N., Isobe, T., Jungclaus, A., Kameda, D., Kim, G.D., Kim, Y.K., Kojouharov, I., Kondev, F.G., Kubo, T., Kurz, N., Kwon, Y.K., Lane, G.J., Li, Z., Moon, C.B., Montaner-Pizá, A., Moschner, K., Naqvi, F., Niikura, M., Nishibata, H., Nishimura, D., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., Sakurai, H., Schaffner, H., Simpson, G.S., Steiger, K., Sun, Y., Suzuki, H., Takeda, H., Wendt, A., and Yoshinaga, K.

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 $^{125}$Pd$_{79}$ and $^{127}$Pd$_{81}$ studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity $^{238}$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 $^{125}$Pd and $^{127}$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 $^{132}$Sn.

Published
2019

4. Is seniority a partial dynamic symmetry in the first Shell?

Author

Morales, A.I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.A., Sumikama, T., Valiente-Dobón, J.J., Wu, J., Xu, Z.Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F.L., Blasi, N., Bracco, A., Bruce, A.M., Camera, F., Ceruti, S., Crespi, F.C.L., Delattre, M.C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D.R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P.H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., and Yalcinkaya, M.

Abstract

The low-lying structures of the midshell νg9/2 Ni isotopes $^{72}$Ni and $^{74}$Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei $^{72}$Co and $^{74}$Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For $^{74}$Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near $^{78}$Ni.

Published
2018

5. Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

Author

Browne, F., Bruce, A.M., Sumikama, T., Nishizuka, I., Taprogge, J., Werner, V., Wieland, O., Science and Technology Facilities Council (UK), Ministerio de Ciencia e Innovación (España), RIKEN Nishina Center for Accelerator-Based Science, Japan Society for the Promotion of Science, and SCOAP

Abstract

F. Browne et al.; 5 pags.; 3 figs.; Open Access funded by Creative Commons Atribution Licence 4.0, © 2015 The Authors. The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2+ states in 104,106Zr nuclei have been measured via β-delayed γ -ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 2+1 state in 104Zr was obtained, τ (2+1 ) = 2.90+25−20 ns, as well as a first measurement of the 2+1 state in 106Zr, τ (2+ 1 ) =2.60+20−15 ns, with corresponding reduced transition probabilities of B(E2; 2+1 → 0+g.s.) = 0.39(2) e2b2 and 0.31(1) e2b2, respectively. Comparisons of the extracted ground-state deformations, β2 = 0.39(1) (104Zr) and β2 = 0.36(1) (106Zr) with model calculations indicate a persistence of prolate deformation. The data show that 104Zr is the most deformed of the neutron-rich Zr isotopes measured so far., We would like to express our gratitude to the RIKEN Nishina Center accelerator department for providing a stable and high intensity 238U primary beam. F.B. is grateful to C.R. Nita for invaluable discussions on fast-timing measurements using LaBr3(Ce) detectors. This work was supported by JSPS KAKENHI Grants Nos. 26800117 and 25247045. UK authors were supported by STFC Grant Nos. ST/J000132/1, ST/J000051/1 and ST/K502431/1. P.H.R. acknowledges support from the UK National Measurement Office (NMO). P.-A.S. was financed by JSPS Grant No. 23 01752 and the RIKEN Foreign Postdoctoral Researcher Program. V.W. was supported by DOE Grant No. DE-FG02-91ER-40609. J.T. was financed by Spanish Ministerio de Ciencia e Innovación under Contracts No. FPA2009-13377-C02 and No. FPA2011-29854-C04. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors.

Published
2015

6. Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons

Author

Taprogge, J.(Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain), Jungclaus, A.(Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain), Grawe, H.(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany), Nishimura, S.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Xu, Z.Y.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Doornenbal, P.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Lorusso, G.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Nácher, E.(Instituto de Estructura de la Materia, CSIC, Madrid, E-28006, Spain), Simpson, G.S.(LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble cedex, F-38026, France), Söderström, P.-A.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Sumikama, T.(Department of Physics, Tohoku University, Aoba, Sendai, Miyagi, 980-8578, Japan), Baba, H.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Browne, F.(School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4JG, United Kingdom), Fukuda, N.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Gernhäuser, R.(Physik Department E12, Technische Universität München, Garching, D-85748, Germany), Gey, G.(LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble cedex, F-38026, France), Inabe, N.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Isobe, T.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Jung, H.S.(Department of Physics, Chung-Ang University, Seoul, 156-756, Republic of Korea), Kameda, D.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Kim, G.D.(Rare Isotope Science Project, Institute for Basic Science, Daejeon, 305-811, Republic of Korea), Kim, Y.-K.(Rare Isotope Science Project, Institute for Basic Science, Daejeon, 305-811, Republic of Korea), Kojouharov, I.(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany), Kubo, T.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Kurz, N.(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany), Kwon, Y.K.(Rare Isotope Science Project, Institute for Basic Science, Daejeon, 305-811, Republic of Korea), Li, Z.(School of Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China), Sakurai, H.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Schaffner, H.(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany), Steiger, K.(Physik Department E12, Technische Universität München, Garching, D-85748, Germany), Suzuki, H.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Takeda, H.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Vajta, Zs.(MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary), Watanabe, H.(RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan), Wu, J.(School of Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China), Yagi, A.(Department of Physics, Osaka University, Machikaneyama-machi 1-1, Toyonaka, Osaka, 560-0043, Japan), Yoshinaga, K.(Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan), Benzoni, G.(INFN, Sezione di Milano, via Celoria 16, Milano, I-20133, Italy), Bönig, S.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany), Chae, K.Y.(Department of Physics, Sungkyunkwan University, Suwon, 440-746, Republic of Korea), Coraggio, L.(Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Napoli, I-80126, Italy), Covello, A.(Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Napoli, I-80126, Italy), Daugas, J.-M.(CEA, DAM, DIF, Arpajon cedex, 91297, France), Drouet, F.(LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble cedex, F-38026, France), Gadea, A.(Instituto de Física Corpuscular, CSIC, Univ. of Valencia, Paterna, E-46980, Spain), Gargano, A.(Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Napoli, I-80126, Italy), Ilieva, S.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany), Kondev, F.G.(Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL, 60439, USA), Kröll, T.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany), Lane, G.J.(Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia), Montaner-Pizá, A.(Instituto de Física Corpuscular, CSIC, Univ. of Valencia, Paterna, E-46980, Spain), Moschner, K.(IKP, University of Cologne, Cologne, D-50937, Germany), Mücher, D.(Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, D-64289, Germany), Naqvi, F.(Wright Nuclear Structure Laboratory, Yale University, New Haven, CT, 06520-8120, USA), Niikura, M.(Department of Physics, University of Tokyo, Japan, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033), Nishibata, H.(Department of Physics, Osaka University, Machikaneyama-machi 1-1, Toyonaka, Osaka, 560-0043, Japan), Odahara, A.(Department of Physics, Osaka University, Machikaneyama-machi 1-1, Toyonaka, Osaka, 560-0043, Japan), Orlandi, R.(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Heverlee, B-3001, Belgium), Patel, Z.(Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom), Podolyák, Zs.(Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom), and Wendt, A.(IKP, University of Cologne, Cologne, D-50937, Germany)

Subjects
Isomeric decays, Shell model calculations, Nuclear Theory, Physics::Atomic and Molecular Clusters, Transition strengths, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999
Abstract

The decay of an isomeric state in the neutron-rich nucleus 129Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T1/2=3.6(2) ms was determined for the new state which was assigned a spin of (21/2+), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions. Keywords: Isomeric decays, Transition strengths, Shell model calculations

Published
2014

7. Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons

Author

Taprogge, J., Jungclaus, Andrea, Grawe, H., Nishimura, S., Gadea, Andrés, Gargano, A., Ilieva, S., Kondev, F.G., Kröll, T., Lane, G.J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Z., Wendt, A., and SCOAP

Abstract

J. Taprogge, et al. ; 5 pags. ; 4 figs. ; 1 tab. ; Open Access funded by SCOAP3 - Sponsoring Consortium for Open Access Publising in Particle Physics, © 2014 The Authors. The decay of an isomeric state in the neutron-rich nucleus 129Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T1/2=3.6(2)ms was determined for the new state which was assigned a spin of (21/2+), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions., This work was supported by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2009-13377-C02 and FPA2011-29854-C04, the Generalitat Valenciana (Spain) under grant PROMETEO/2010/101, the Japanese government under contract KAKENHI (25247045), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. NRF-2012R1A1A1041763), the Priority Centers Research Program in Korea (2009-0093817), OTKA contract number K-100835, 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, STFC (UK), and the German BMBF (Nos. 05P12RDCIA and 05P12RDNUP) and HIC for FAIR.

Published
2014

8. Identification of a millisecond isomeric state in Cd-129(81) via the detection of internal conversion and Compton electrons

Author

Taprogge, J., Jungclaus, A., Grawe, H., Nishimura, S., Xu, Z. Y., Doornenbal, P., Lorusso, G., Nacher, E., Simpson, G. S., Soederstroem, P. -A., Sumikama, T., Baba, H., Browne, F., Fukuda, N., Gernhauser, 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., Lin, Z., Sakurai, H., Schaffner, H., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Boenig, S., Chae, K. Y., Coraggio, L., Covello, A., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Kondev, F. G., Kroell, T., Lane, G. J., Montaner-Piza, A., Moschner, K., Muecher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., Wendt, A., Taprogge, J., Jungclaus, A., Grawe, H., Nishimura, S., Xu, Z. Y., Doornenbal, P., Lorusso, G., Nacher, E., Simpson, G. S., Soederstroem, P. -A., Sumikama, T., Baba, H., Browne, F., Fukuda, N., Gernhauser, 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., Lin, Z., Sakurai, H., Schaffner, H., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Boenig, S., Chae, K. Y., Coraggio, L., Covello, A., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Kondev, F. G., Kroell, T., Lane, G. J., Montaner-Piza, A., Moschner, K., Muecher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyak, Zs., and Wendt, A.

Abstract

The decay of an isomeric state in the neutron-rich nucleus Cd-129 has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a U-238 beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of gamma-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T-1/2 = 3.6(2) ms was determined for the new state which was assigned a spin of (21/2(+)), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions. (C) 2014 The Authors. Published by Elsevier B.V.

Published
2014

9. The Lund-York-Cologne Calorimeter (LYCCA): Concept, design and prototype developments for a FAIR-NUSTAR detector system to discriminate relativistic heavy-ion reaction products

Author

Golubev, P., Wendt, A., Scruton, L., Taprogge, J., Rudolph, D., Reiter, P., Bentley, M. A., Avdeichikov, V., Boutachkov, P., Fox, S. P., Gerl, J., Goergen, Ch., Hoischen, R., Kurz, N., Singh, B. S. Nara, Pascovici, G., Pietri, S., Schaffner, H., Taylor, M. J., Thiel, S., Wollersheim, H. J., Golubev, P., Wendt, A., Scruton, L., Taprogge, J., Rudolph, D., Reiter, P., Bentley, M. A., Avdeichikov, V., Boutachkov, P., Fox, S. P., Gerl, J., Goergen, Ch., Hoischen, R., Kurz, N., Singh, B. S. Nara, Pascovici, G., Pietri, S., Schaffner, H., Taylor, M. J., Thiel, S., and Wollersheim, H. J.

Abstract

The concept, design and prototype developments for the Lund-York-Cologne CAlorimeter (LYCCA) is presented. LYCCA is a modular device for the NUclear STructure, Astrophysics and Reactions (NUSTAR) science pillar of the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. LYCCA is designed to discriminate heavy ions produced in nuclear reactions induced by relativistic radioactive ion beams. Measurements of energy loss, total energy, and time-of-flight allow the derivation of proton number, Z, and mass number, A, of the reaction products. LYCCA-inherent tracking of the flight paths of the reaction products enables coincident High-resolution in-beam gamma-ray SPECtroscopy (HISPEC) of atomic nuclei far from the line of beta-stability. (C) 2013 Elsevier B.V. All rights reserved.

Published
2013

10. The Lund-York-Cologne Calorimeter (LYCCA): Concept, Design and Prototype Developments for a FAIR-NUSTAR Detector System to Discriminate Relativistic Heavy-ion Reaction Products

Author

Golubev, Pavel, Wendt, A., Scruton, L., Taprogge, J., Rudolph, Dirk, Reiter, P., Bentley, M. A., Avdeichikov, Vladimir, Boutachkov, P., Fox, S. P., Gerl, J., Goergen, Ch., Hoischen, Robert, Kurz, N., Singh, B. S. Nara, Pascovici, G., Pietri, S., Schaffner, H., Taylor, M. J., Thiel, S., Wollersheim, H. J., Golubev, Pavel, Wendt, A., Scruton, L., Taprogge, J., Rudolph, Dirk, Reiter, P., Bentley, M. A., Avdeichikov, Vladimir, Boutachkov, P., Fox, S. P., Gerl, J., Goergen, Ch., Hoischen, Robert, Kurz, N., Singh, B. S. Nara, Pascovici, G., Pietri, S., Schaffner, H., Taylor, M. J., Thiel, S., and Wollersheim, H. J.

Abstract

The concept, design and prototype developments for the Lund-York-Cologne CAlorimeter (LYCCA) is presented. LYCCA is a modular device for the NUclear STructure, Astrophysics and Reactions (NUSTAR) science pillar of the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. LYCCA is designed to discriminate heavy ions produced in nuclear reactions induced by relativistic radioactive ion beams. Measurements of energy loss, total energy, and time-of-flight allow the derivation of proton number, Z, and mass number, A, of the reaction products. LYCCA-inherent tracking of the flight paths of the reaction products enables coincident High-resolution in-beam gamma-ray SPECtroscopy (HISPEC) of atomic nuclei far from the line of beta-stability. (C) 2013 Elsevier B.V. All rights reserved.

Published
2013

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