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Perkowski J, Andrzejewski J, Janiak Ł, Samorajczyk J, Abraham T, Droste C, Grodner E, Hadyńska-Klęk K, Kisieliński M, Komorowska M, Kowalczyk M, Kownacki J, Mierzejewski J, Napiorkowski P, Korman A, Srebrny J, Stolarz A, Zielińska M. University of Lodz an electron spectrometer--a new conversion-electron spectrometer for "in-beam" measurements. Rev Sci Instrum 2014; 85:043303. [PMID: 24784598 DOI: 10.1063/1.4870899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The designed and constructed at the University of Lodz an electron spectrometer is devoted to "in-beam" measurements. The apparatus is characterized by high efficiency up to 9%, good energy resolution (FWHM = 5 keV at 482 keV) and, what is very important good suppression of delta electrons, positrons, and photons emitted by the targets. This achievement was obtained using a combination of magnetic field in two different layouts: perpendicular and parallel to the axis of the spectrometer being orthogonal to the beamline. The conversion-electron spectrometer coupled to the EAGLE array was successfully tested in an "in-beam" measurement.
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Affiliation(s)
- J Perkowski
- Faculty of Physics and Applied Computer Science, University of Lodz, Lodz 90-236, Poland
| | - J Andrzejewski
- Faculty of Physics and Applied Computer Science, University of Lodz, Lodz 90-236, Poland
| | - Ł Janiak
- Faculty of Physics and Applied Computer Science, University of Lodz, Lodz 90-236, Poland
| | - J Samorajczyk
- Faculty of Physics and Applied Computer Science, University of Lodz, Lodz 90-236, Poland
| | - T Abraham
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - Ch Droste
- Faculty of Physics, University of Warsaw, Warsaw 00-681, Poland
| | - E Grodner
- Faculty of Physics, University of Warsaw, Warsaw 00-681, Poland
| | - K Hadyńska-Klęk
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - M Kisieliński
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - M Komorowska
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - M Kowalczyk
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - J Kownacki
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - J Mierzejewski
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - P Napiorkowski
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - A Korman
- The National Centre for Nuclear Research, Andrzeja Sołtana 7, 05-400 Otwock, Świerk, Poland
| | - J Srebrny
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - A Stolarz
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
| | - M Zielińska
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093 Warsaw, Poland
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Sibczynski P, Kownacki J, Syntfeld-Kazuch A, Moszynski M, Kisielinski M, Czarnacki W, Kosinski K, Matusiak M, Klimasz M, Kowalczyk M, Abraham T, Mierzejewski J, Srebrny J. Decay chains and photofission investigation based on nuclear spectroscopy of highly enriched uranium sample. Appl Radiat Isot 2013; 82:170-4. [PMID: 24013389 DOI: 10.1016/j.apradiso.2013.08.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 08/08/2013] [Accepted: 08/09/2013] [Indexed: 10/26/2022]
Abstract
Nuclear spectroscopy experiments were performed for 100g metallic uranium rod enriched to 93% (235)U, in order to establish and characterize the most prominent γ-rays in the natural decay series and photofission reaction. Single γ-ray spectra and γ-γ coincidences measurements were conducted before irradiation. The uranium sample was subsequently irradiated with 15 MeV bremsstrahlung photons. Relative intensities of γ-lines and several values of half-lives of the fission fragments decays were determined. The obtained information can be utilized in detection of smuggled nuclear materials and characterization of bulky nuclear waste packages.
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Affiliation(s)
- P Sibczynski
- National Centre for Nuclear Research, 05-400 Otwock-Swierk, Poland.
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Cederwall B, Moradi FG, Bäck T, Johnson A, Blomqvist J, Clément E, de France G, Wadsworth R, Andgren K, Lagergren K, Dijon A, Jaworski G, Liotta R, Qi C, Nyakó BM, Nyberg J, Palacz M, Al-Azri H, Algora A, de Angelis G, Ataç A, Bhattacharyya S, Brock T, Brown JR, Davies P, Di Nitto A, Dombrádi Z, Gadea A, Gál J, Hadinia B, Johnston-Theasby F, Joshi P, Juhász K, Julin R, Jungclaus A, Kalinka G, Kara SO, Khaplanov A, Kownacki J, La Rana G, Lenzi SM, Molnár J, Moro R, Napoli DR, Singh BSN, Persson A, Recchia F, Sandzelius M, Scheurer JN, Sletten G, Sohler D, Söderström PA, Taylor MJ, Timár J, Valiente-Dobón JJ, Vardaci E, Williams S. Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd. Nature 2011; 469:68-71. [PMID: 21179086 DOI: 10.1038/nature09644] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 11/02/2010] [Indexed: 11/09/2022]
Abstract
Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work that introduced a strong spin-orbit interaction to the nuclear shell model potential. However, knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers (N = Z), enhanced correlations arise between neutrons and protons (two distinct types of fermions) that occupy orbitals with the same quantum numbers. Such correlations have been predicted to favour an unusual type of nuclear superfluidity, termed isoscalar neutron-proton pairing, in addition to normal isovector pairing. Despite many experimental efforts, these predictions have not been confirmed. Here we report the experimental observation of excited states in the N = Z = 46 nucleus (92)Pd. Gamma rays emitted following the (58)Ni((36)Ar,2n)(92)Pd fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution γ-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron-proton coupling scheme, different from the previous prediction. We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling) in the ground and low-lying excited states of the heaviest N = Z nuclei. Such strong, isoscalar neutron-proton correlations would have a considerable impact on the nuclear level structure and possibly influence the dynamics of rapid proton capture in stellar nucleosynthesis.
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Affiliation(s)
- B Cederwall
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden.
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Kownacki J, Fellenberg JV, Rösier K, Schneider V, Bettecken T, Moser H, Burgunder JM. The 17p11.2 locus in hereditary neuropathy with liability to pressure palsies, in juvenile and familial carpal tunnel syndrome and in hereditary neuralgic amyotrophy*. Eur J Neurol 2011. [DOI: 10.1111/j.1468-1331.1996.tb00277.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Grodner E, Srebrny J, Pasternak AA, Zalewska I, Morek T, Droste C, Mierzejewski J, Kowalczyk M, Kownacki J, Kisieliński M, Rohoziński SG, Koike T, Starosta K, Kordyasz A, Napiorkowski PJ, Wolińska-Cichocka M, Ruchowska E, Płóciennik W, Perkowski J. 128Cs as the best example revealing chiral symmetry breaking. Phys Rev Lett 2006; 97:172501. [PMID: 17155467 DOI: 10.1103/physrevlett.97.172501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Indexed: 05/12/2023]
Abstract
The results of the Doppler-shift attenuation method lifetime measurements in partner bands of 128Cs and 132La are presented. Experimental reduced transition probabilities in 128Cs are compared with theoretical calculations done in the frame of the core-quasiparticle coupling model. The electromagnetic properties, energy and spin of levels belonging to the partner bands show that 128Cs is the best known example revealing the chiral symmetry breaking phenomenon.
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Affiliation(s)
- E Grodner
- Institute of Experimental Physics, Warsaw University, ul. Hoza 69, PL-00681, Warsaw, Poland
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Cederkäll J, Lipoglavsek M, Palacz M, Persson J, Ataç A, Fahlander C, Grawe H, Johnson A, Klamra W, Kownacki J, Likar A, Norlin LO, Nyberg J, Schubart R, Seweryniak D, Bednarczyk P, Dombrádi Z, Foltescu D, Jerrestam D, Juutinen S, Mäkelä E, Nyakó BM, Perez G, Roth HA, Shizuma T, Skeppstedt Ö, Sletten G, Törmänen S. Erratum: First evidence for excited states in 101In. Phys Rev C Nucl Phys 1996; 54:960. [PMID: 9971425 DOI: 10.1103/physrevc.54.960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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7
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Cederkäll J, Lipoglavsek M, Palacz M, Persson J, Ataç A, Fahlander C, Grawe H, Johnson A, Klamra W, Kownacki J, Likar A, Norlin LO, Nyberg J, Schubart R, Seweryniak D, Bednarczyk P, Dombrádi Z, Foltescu D, Jerrestam D, Juutinen S, Mäkelä E, Nyakó BM, Perez G, Roth HA, Shizuma T, Skeppstedt Ö, Sletten G, Törmänen S. First evidence for excited states in 101In. Phys Rev C Nucl Phys 1996; 53:1955-1958. [PMID: 9971153 DOI: 10.1103/physrevc.53.1955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lipoglavsek M, Cederkäll J, Palacz M, Persson J, Atac-under-dot A, Blomqvist J, Fahlander C, Grawe H, Johnson A, Kerek A, Klamra W, Kownacki J, Likar A, Norlin L, Nyberg J, Schubart R, Seweryniak D, Bednarczyk P, Dombrádi Z, Foltescu D, Jerrestam D, Juutinen S, Mäkelä E, Perez G, Roth HA, Shizuma T, Skeppstedt Ö, Sletten G, Törmänen S, Vass T. Stability of 10050Sn50 deduced from excited states in 9948Cd51. Phys Rev Lett 1996; 76:888-891. [PMID: 10061577 DOI: 10.1103/physrevlett.76.888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Dombrádi Z, Nyakó BM, Perez GE, Algora A, Fahlander C, Seweryniak D, Nyberg J, Atac A, Cederwall B, Johnson A, Kerek A, Kownacki J, Norlin LO, Wyss R, Adamides E, Ideguchi E, Julin R, Juutinen S, Karczmarczyk W, Mitarai S, Piiparinen M, Schubart R, Sletten G, Törmänen S, Virtanen A. High-spin spectroscopy of 109Te. Phys Rev C Nucl Phys 1995; 51:2394-2399. [PMID: 9970321 DOI: 10.1103/physrevc.51.2394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Parus JL, Ratynski W, Zółtowski T, Tys J, Kierzek J, Cieślak E, Kownacki J. Erratum. J Radioanal Nucl Chem 1979. [DOI: 10.1007/bf02520969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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