☆ 4.4 Article

Alpha-gamma decay studies of 253No and its daughter products 253Md, 249Fm

EUROPEAN PHYSICAL JOURNAL A (2012)

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EUROPEAN PHYSICAL JOURNAL A

卷 48, 期 5, 页码 -

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SPRINGER

DOI: 10.1140/epja/i2012-12075-8

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Physics, Nuclear Physics, Particles & Fields

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EURONS (EUROpean Nuclear Structure - Transnational Access) [RII3-CT-2004-506065]
Slovak Research and Development Agency [APVV-0105-10]
Slovak grant agency VEGA [1/0613/11]
Grants-in-Aid for Scientific Research [22540316] Funding Source: KAKEN

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摘要

Nuclear structure and decay of the isotope No-253 and its decay products Fm-249 and Md-253 were investigated by means of alpha-gamma spectroscopy. Besides the established strong gamma transitions from the 9/2(-)[734] Nilsson level in Fm-249, populated predominantly by the a decay of No-253, into the ground-state (gs) rotational band, a couple of weaker gamma lines (58.3, 129.2, 209.3 and 669.5 keV) were observed and placed into the Fm-249 level scheme. The transition from the 7/2(-) level in Es-249, populated by the alpha decay of Md-253, into the 9/2(+) member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. GEANT4 simulations were performed to investigate the influence of energy summing between alpha particles and conversion electrons (CE) on the shape of the alpha spectra at different implantation energies, leading to evidence for a weak alpha decay branch of No-253 into the gs of Fm-249 or the ground-state rotational band, respectively.

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Article Physics, Particles & Fields

The SFiNx Detector System

A. Isaev, A. Yeremin, N. Zamyatin, I. N. Izosimov, A. A. Kuznetsova, O. N. Malyshev, R. S. Mukhin, A. G. Popeko, Yu A. Popov, B. Sailaubekov, A. Svirikhin, E. A. Sokol, M. S. Tezekbayeva, D. A. Testov, M. L. Chelnokov, V. Chepigin, S. Antalic, P. Mosat, P. Brionnet, B. Gall, O. Dorvaux, K. Kessaci, A. Sellam, A. Lopez-Martens, K. Hauschild

Summary: A new detector system for investigating the properties of spontaneous fission of short-lived transuranium nuclei has been developed and tested. The system showed a high neutron registration efficiency and the experimental data were compared with previously published results, obtaining the average neutron per fission act and the multiplicity distribution of prompt neutrons.

PHYSICS OF PARTICLES AND NUCLEI LETTERS (2022)

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Article Physics, Nuclear

Study of the production and decay properties of neutron-deficient nobelium isotopes

M. S. Tezekbayeva, A. Yeremin, A. Svirikhin, A. Lopez-Martens, M. L. Chelnokov, V. Chepigin, A. Isaev, I. N. Izosimov, A. Karpov, A. A. Kuznetsova, O. N. Malyshev, R. S. Mukhin, A. G. Popeko, Yu A. Popov, V. A. Rachkov, B. S. Sailaubekov, E. A. Sokol, K. Hauschild, H. Jacob, R. Chakma, O. Dorvaux, M. Forge, B. Gall, K. Kessaci, B. Andel, S. Antalic, A. Bronis, P. Mosat

Summary: The new neutron-deficient isotope No-249 was synthesized for the first time, and its decay properties and nuclear structure were determined. The decay process of the daughter nucleus Fm-245 was also measured and studied.

EUROPEAN PHYSICAL JOURNAL A (2022)

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Article Astronomy & Astrophysics

First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic 187Pb

W. Q. Zhang, A. N. Andreyev, Z. Liu, D. Seweryniak, H. Huang, Z. H. Li, J. G. Li, C. Y. Guo, D. T. Doherty, A. E. Barzakh, P. Van Duppen, J. G. Cubiss, B. Andel, S. Antalic, M. Block, A. Bronis, M. P. Carpenter, P. Copp, B. Ding, Z. Favier, F. Giacoppo, T. H. Huang, X. H. Yu, B. Kindler, F. G. Kondev, T. Lauritsen, G. S. Li, B. Lommel, H. Y. Lu, M. Al Monthery, P. Mosat, Y. F. Niu, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, H. Y. Wu, Z. H. Wang, F. R. Xu, Q. B. Zeng, X. H. Zhou

Summary: A new isomeric state at only 308 keV above the ground state has been identified in the neutron-deficient isotope 187Pb, showing similarities to a state in a neighboring isotope. The excitation energy of the isomer is surprisingly low compared to similar states in nearby isotopes. Additionally, evidence for triple shape coexistence at low energy in 187Pb has been presented, supported by potential-energy surface calculations.

PHYSICS LETTERS B (2022)

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Article Instruments & Instrumentation

NEMESIS setup for Indirect Detection of WIMPs

W. H. Trzaska, A. Barzilov, T. Enqvist, K. Jedrzejczak, J. Joutsenvaara, M. Kasztelan, O. Kotavaara, P. Kuusiniemi, K. K. Loo, J. Orzechowski, J. Puputti, M. Slupecki, J. Szabelski, I Usoskin, T. E. Ward

Summary: We summarize the evidence for DM-like anomalies in neutron multiplicity spectra collected underground with Pb targets by three independent experiments: NEMESIS, NMDS, and ZEPLIN-II. The anomalies persist at high neutron multiplicities and show consistent positions and intensities between the three systems. The combined analysis excludes a statistical fluke to better than one in a million. To prove the existence of the anomalies, an upgrade to the NEMESIS setup is proposed along with the use of a Cu target.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT (2022)

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Article Astronomy & Astrophysics

First observation of the decay of the 13/2+ isomer in 183Hg and B (M2) systematics of neutron transitions across the nuclear chart

H. Huang, W. Q. Zhang, A. N. Andreyev, Z. Liu, D. Seweryniak, Z. H. Li, C. Y. Guo, A. E. Barzakh, P. Van Duppen, B. Andel, S. Antalic, M. Block, A. Bronis, M. P. Carpenter, P. Copp, J. G. Cubiss, B. Ding, D. T. Doherty, Z. Favier, F. Giacoppo, T. H. Huang, B. Kindler, F. G. Kondev, T. Lauritsen, J. G. Li, G. S. Li, B. Lommel, H. Y. Lu, M. Al Monthery, P. Mosat, Y. F. Niu, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, H. Y. Wu, Z. H. Wang, F. R. Xu, Q. B. Zeng, X. H. Yu, F. F. Zeng, X. H. Zhou

Summary: The decay of the 13/2(+) isomeric state in Hg-183 was observed for the first time, and it is proposed to deexcite through an unobserved low-energy M2 transition to a known 9/2(-) member.

PHYSICS LETTERS B (2022)

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Article Physics, Nuclear

Simultaneous ?-ray and electron spectroscopy of 182,184,186Hg isotopes

M. Stryjczyk, B. Andel, J. G. Cubiss, K. Rezynkina, T. R. Rodriguez, J. E. Garcia-Ramos, A. N. Andreyev, J. Pakarinen, P. Van Duppen, S. Antalic, T. Berry, M. J. G. Borge, C. Clisu, D. M. Cox, H. De Witte, L. M. Fraile, H. O. U. Fynbo, L. P. Gaffney, L. J. Harkness-Brennan, M. Huyse, A. Illana, D. S. Judson, J. Konki, J. Kurcewicz, I. Lazarus, R. Lica, M. Madurga, N. Marginean, R. Marginean, C. Mihai, P. Mosat, E. Nacher, A. Negret, J. Ojala, J. D. Ovejas, R. D. Page, P. Papadakis, S. Pascu, A. Perea, Zs. Podolyak, L. Prochniak, V. Pucknell, E. Rapisarda, F. Rotaru, C. Sotty, O. Tengblad, V. Vedia, S. Vinals, R. Wadsworth, N. Warr, IDS Collaboration

Summary: This study aimed to improve the precision of known branching ratios and internal conversion coefficients, increase the knowledge about excited states in 182,184,186Hg, and interpret the results in the context of shape coexistence using different models. The low-energy structures in 182,184,186Hg were studied through the beta decay of 182,184,186Tl, and the experimental results were qualitatively reproduced by several theoretical approaches.

PHYSICAL REVIEW C (2023)

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Article Physics, Nuclear

Identification of excited states in 188Bi and 188Po

W. Q. Zhang, A. N. Andreyev, Z. Liu, D. Seweryniak, H. Huang, Z. H. Li, J. G. Li, C. Y. Guo, A. E. Barzakh, P. Van Duppen, M. Al Monthery, B. Andel, S. Antalic, M. Block, A. Bronis, M. P. Carpenter, P. Copp, J. G. Cubiss, B. Ding, D. T. Doherty, Z. Favier, F. Giacoppo, T. H. Huang, B. Kindler, F. G. Kondev, T. Lauritsen, G. S. Li, B. Lommel, H. Y. Lu, P. Mosat, Y. F. Niu, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, H. Y. Wu, Z. H. Wang, F. R. Xu, X. H. Yu, Q. B. Zeng, X. H. Zhou

Summary: In this study, the neutron-deficient Bi-188 and Po-188 isotopes were investigated using gamma-ray spectroscopy and the recoil-decay tagging technique with the Argonne Gas-Filled Analyzer. A new isomeric state and a prompt cascade were identified in Bi-188, while the first excited state was observed in Po-188. These new results provide new information on shape coexistence in bismuth and polonium isotopes near the neutron midshell at N = 104.

PHYSICAL REVIEW C (2022)

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Article Physics, Nuclear

Decay studies of new isomeric states in 255No

A. Bronis, F. P. Hessberger, S. Antalic, B. Andel, D. Ackermann, S. Heinz, S. Hofmann, J. Khuyagbaatar, B. Kindler, I Kojouharov, P. Kuusiniemi, M. Leino, B. Lommel, R. Mann, K. Nishio, A. G. Popeko, B. Streicher, B. Sulignano, J. Uusitalo, M. Venhart, A. Yeremin

Summary: The decay of excited states in No-255 was investigated using the evaporation-residue-conversion-electron correlation technique. Two new isomeric states were discovered, along with a previously known one. The excitation energies of these isomeric states were estimated based on conversion electrons and gamma rays, and the results were consistent with theoretical calculations. A tentative decay scheme and Nilsson configurations of the isomeric states in No-255 were proposed.

PHYSICAL REVIEW C (2022)

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Article Physics, Nuclear

Decay modes of the 9/2- isomeric state in 183Tl

M. Venhart, A. N. Andreyev, J. G. Cubiss, J. L. Wood, A. E. Barzakh, C. Van Beveren, T. E. Cocolios, R. P. de Groote, D. Fedorov, V. N. Fedosseev, R. Ferrer, D. A. Fink, L. Ghys, M. Huyse, U. Koster, J. Lane, V Liberati, K. M. Lynch, B. A. Marsh, P. L. Molkanov, T. J. Procter, E. Rapisarda, K. Sandhu, M. D. Seliverstov, A. M. Sjodin, P. Van Duppen, M. Veselsky

Summary: The internal transition decay and alpha decay of Tl-183 isotope have been studied using Resonance Ionization Laser Ion Source and Windmill detection setup at CERN. The multipolarities of the transitions have been determined through simultaneous gamma-ray and conversion-electron spectroscopy. This study provides improved data for the fine structure of Tl-183m -> 179 Au decay.

PHYSICAL REVIEW C (2022)

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Proceedings Paper Physics, Multidisciplinary

STUDY OF SPONTANEOUS FISSION USING THE SFiNx SYSTEM

A. V. Isaev, A. V. Yeremin, N. I. Zamyatin, I. N. Izosimov, A. A. Kuznetsova, O. N. Malyshev, R. S. Mukhin, A. G. Popeko, Yu. A. Popov, B. Sailaubekov, A. I. Svirikhin, E. A. Sokol, M. S. Tezekbayeva, D. A. Testov, M. L. Chelnokov, V. I. Chepigin, S. Antalic, P. Mosat, P. Brionnet, B. Gall, O. Dorvaux, K. Kessaci, A. Sellam, A. Lopez-Martens, K. Hauschild

Summary: A new detector system consisting of 116 He-3 neutron counters and a DSSSD array was created to study spontaneous fission properties of short-lived heavy isotopes. The system was used to measure the single neutron registration efficiency and obtained new data for prompt neutron yields of No-252 isotope.

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT (2021)

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Article Physics, Nuclear

New β-decaying state in 214Bi

B. Andel, P. Van Duppen, A. N. Andreyev, A. Blazhev, H. Grawe, R. Lica, H. Naidja, M. Stryjczyk, A. Algora, S. Antalic, A. Barzakh, J. Benito, G. Benzoni, T. Berry, M. J. G. Borge, K. Chrysalidis, C. Clisu, C. Costache, J. G. Cubiss, H. De Witte, D. Fedorov, V. N. Fedosseev, L. M. Fraile, H. O. U. Fynbo, P. T. Greenlees, L. J. Harkness-Brennan, M. Huyse, A. Illana, J. Jolie, D. S. Judson, J. Konki, I Lazarus, M. Madurga, N. Marginean, R. Marginean, C. Mihai, B. A. Marsh, P. Molkanov, P. Mosat, J. R. Murias, E. Nacher, A. Negret, R. D. Page, S. Pascu, A. Perea, V Pucknell, P. Rahkila, E. Rapisarda, K. Rezynkina, V Sanchez-Tembleque, K. Schomacker, M. D. Seliverstov, C. Sotty, L. Stan, C. Surder, O. Tengblad, V. Vedia, S. Vinals, R. Wadsworth, N. Warr

Summary: A new beta-decaying state in Bi-214 was identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. The decay pattern to levels in Po-214 and shell-model calculations suggest an I-pi = (8(-)) assignment for this state, with a deduced half-life of 9.39 minutes. Further investigations using gamma-gamma coincidences revealed new levels and transitions in Po-214. Shell-model calculations using different effective interactions confirmed the interpretation of the new state as an I-pi = 8 - isomer.

PHYSICAL REVIEW C (2021)

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