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1. Production and evaluation of 236gNp and reference materials for naturally occurring radioactive materials

Author: Larijani, C. and Regan, P. H.
Subjects: 541
Abstract: This thesis is based on the development of a radiochemical separation scheme capable of separating both 236gNp and 236Pu from a uranium target of natural isotopic composition (~1 g uranium) and ~200 MBq of fission decay products. The isobaric distribution of fission residues produced following the bombardment of a natural uranium target with a beam of 25 MeV protons has been evaluated. Decay analysis of thirteen isobarically distinct fission residues were carried out using high-resolution γ-ray spectrometry at the UK National Physical Laboratory. Stoichiometric abundances were calculated via the determination of absolute activity concentrations associated with the longest-lived members of each isobaric chain. This technique was validated by computational modelling of likely sequential decay processes through an isobaric decay chain. The results were largely in agreement with previously published values for neutron bombardments on natural uranium at energies of 14 MeV. Higher relative yields of products with mass numbers A~110–130 were found, consistent with the increasing yield of these radionuclides as the bombarding energy is increased. Using literature values for the production cross-section for fusion of protons with uranium targets, it is estimated that an upper limit of approximately 250 Bq of activity from the 236Np ground state was produced in this experiment. Using a radiochemical separation scheme, Np and Pu fractions were separated from the produced fission decay products, with analyses of the target-based final reaction products made using Inductively Couple Plasma Mass Spectrometry (ICP-MS) and high-resolution α and γ-ray spectrometry. In a separate research theme, reliable measurement of Naturally Occurring Radioactive Materials is of significance in order to comply with environmental regulations and for radiological protection purposes. The thesis describes the standardisation of three reference materials, namely Sand, Tuff and TiO2 which can serve as quality control materials to achieve traceability, method validation and instrument calibration. The sample preparation, material characterization via γ, α and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and the assignment of values for both the 4n Thorium and 4n + 2 Uranium decay series are presented.
Published: 2017

2. Chemical biology. Techniques and applications by B. Larijani, C. A. Rosser, and R. Woscholski (eds.)

Author: Rhodes, Gale, primary
Published: 2008
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3. Chemical biology. Techniques and applications by B. Larijani, C. A. Rosser, and R. Woscholski (eds.)

Author: Gale Rhodes
Subjects: Polymer science, Chemistry, Chemical biology, Molecular Biology, Biochemistry
Published: 2008
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4. Reference materials produced for a European metrological research project focussing on measurements of NORM

Author: Larijani, C., Pearce, A.K., Regan, P.H., Russell, B.C., Jerome, S.M., Crespo, M.T., de Felice, P., Lutter, G., Maringer, F., and Mazánová, M.
Published: 2017
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5. Development of the NPL gamma-ray spectrometer NANA for traceable nuclear decay and structure studies

Author: Lorusso, G., Shearman, R., Regan, P.H., Judge, S.M., Bell, S., Collins, S.M., Larijani, C., Ivanov, P., Jerome, S.M., Keightley, J.D., Lalkovski, S., Pearce, A.K., and Podolyak, Zs
Published: 2016
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6. The production of Neptunium-236g

Author: Jerome, S.M., Ivanov, P., Larijani, C., Parker, D.J., and Regan, P.H.
Published: 2014
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7. Lifetime measurement in neutron-rich A~100 nuclei

Author: Ansari S., Régis J-M., Jolie J., Saed-Samii N., Warr N., Korten W., Zielińska M., Salsac M.-D., Blanc A., Jentschel M., Köster U., Mutti P., Soldner T., Simpson G.S., Drouet F., Vancraeyenest A., de France G., Clément E., Stezowski O., Ur C.A., Urban W., Regan P.H., Podolyák Zs., Larijani C., Townsley C., Carroll R., Wilson E., Mach H., Fraile L.M., Paziy V., Olaizola B., Vedia V., Bruce A.M., Roberts O.J., Smith J.F., Scheck M., Kröll T., Hartig A.-L., Ignatov A., Ilieva S., Lalkovski S., Mărginean N., Otsuka T., Shimizu N., Togashi T., and Tsunoda Y.
Subjects: Physics, QC1-999
Abstract: Lifetimes of excited states of the 98;100;102Zr nuclei were measured by using the Generalized Centroid Difference Method. The nuclei of interest were populated via neutron-induced fission of 241Pu and 235U during the EXILL-FATIMA campaign. The obtained lifetimes were used to calculate the B(E2) transition strengths and β deformation parameters which were then compared with the recent theoretical predictions obtained with Monte Carlo Shell Model.
Published: 2018
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8. EXILL—a high-efficiency, high-resolution setup for $\gamma$-spectroscopy at an intense cold neutron beam facility

Author: Jentschel, M., Blanc, A., De France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E.Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R.J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Grenoble (INPG), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Institut Laue-Langevin ( ILL ), Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique 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 ), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), 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 ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), 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, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Institut National Polytechnique de Grenoble ( INPG ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), 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 ), Werner, Volker -- 0000-0003-4001-0150, Regnier, David -- 0000-0002-0345-7271, Britton, Richard -- 0000-0001-8532-8504, Cederwall, Bo -- 0000-0003-1771-2656, Valenta, Stanislav -- 0000-0003-2479-1380, Schwengner, Ronald -- 0000-0002-7620-8882, Olaizola, Bruno -- 0000-0003-1604-0640, nannini, adriana -- 0000-0003-0659-7648, Lica, Razvan -- 0000-0001-7066-9787, Petrache, Costel -- 0000-0001-8419-1390, Scheck, Marcus -- 0000-0002-9624-3909, Fraile, Luis M -- 0000-0002-6281-3635, Napoli, Daniel R. -- 0000-0002-8154-6958, Soldner, Torsten -- 0000-0003-2468-5182, GOTTARDO, Andrea -- 0000-0002-0390-5767, Belgya, Tamas -- 0000-0003-4281-5470, Wilson, Emma -- 0000-0003-2695-9853, Clement, Emmanuel -- 0000-0003-1887-717X, de France, Gilles -- 0000-0002-7439-1759, Vedia, Victoria -- 0000-0001-6671-3888, Celikovic, Igor -- 0000-0002-5642-4393, Lozeva, Radomira -- 0000-0002-0024-7068, Lalkovski, Stefan -- 0000-0003-3069-9708, Bottoni, Simone -- 0000-0003-2249-4825, [Jentschel, M. -- Blanc, A. -- Koster, U. -- Mutti, P. -- Soldner, T. -- Urban, W. -- Michelagnoli, C.] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France -- [de France, G. -- Celikovic, I. -- Clement, E. -- Michelagnoli, C.] GANIL, Bvd Becquerel,BP 55027, F-14076 Caen 05, France -- [Leoni, S. -- Benzoni, G. -- Bocchi, G. -- Bottoni, S. -- Crespi, F. -- Million, B. -- Vandone, V.] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy -- [Simpson, G.] Univ Grenoble Alpes, LPSC, F-38026 Grenoble, France -- [Ur, C.] Univ Padua, Dipartimento Fis, Via F Marzolo 8, I-35131 Padua, Italy -- [Ur, C. -- Balabanski, D.] ELI NP, IFIN HH30, Bucharest 077125, Romania -- [Urban, W. -- Czerwinski, M. -- Korgul, A. -- Kurpeta, J. -- Mazzocchi, C.] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland -- [Pfeiffer, M. -- Regis, J. M. -- Saed-Samii, N. -- Thomas, T. -- Warr, N.] Univ Cologne, IKP, Zulpicher Str 77, D-50937 Cologne, Germany -- [Astier, A. -- Konstantinopoulos, T. -- Lozeva, R. -- Petrache, C. -- Zerrouki, T.] Univ Paris Saclay, CNRS, IN2P3, CSNSM, F-91405 Orsay, France -- [Augey, L. -- Guinet, D. -- Redon, N. -- Stezowski, O.] Lyon Univ Claude Bernard, IPN, 43 Blvd 11 Nov 1918, F-69622 Villeurbanne, France -- [Back, T. -- Cederwall, B.] KTH, Phys Dept, Roslagstullsbacken 21, S-10044 Stockholm, Sweden -- [Bajoga, A. -- Britton, R. -- Carroll, R. -- Catford, W. -- Davies, A. -- Lalkovski, S. -- Patel, Z. -- Podolyak, Z. -- Regan, P. -- Rudigier, M. -- Tom, A.] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England -- [Balabanski, D.] INRNE Sofia, 72 Tzarigradsko Shaussee, Sofia 1784, Bulgaria -- [Belgya, T.] Hungarian Acad Sci CER, Konkoly T St 29-33, H-1121 Budapest, Hungary -- [Bernards, C. -- Cooper, N. -- Werner, V.] Yale Univ, Dept Phys, POB 208120, New Haven, CT 06520 USA -- [Biswas, D. C. -- Danu, L. S. -- John, B. V. -- Mukhopadhyay, S.] Bhabha Atom Res Ctr, Nucl Phys Div, Mumbai 400085, Maharashtra, India -- [Bruyneel, B. -- Grente, L. -- Salsac, M. D. -- Zielinska, M.] CEA Saclay ORME Merisiers, DSM IRFU SPHN, Bat 703, F-91191 Gif Sur Yvette, France -- [Burnett, J.] AWE PLC, Reading RG7 4PR, Berks, England -- [Cakirli, R. B.] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey -- [Cieplicka-Oryn'czak, N. -- Szpak, B.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland -- [Csatlos, M. -- Krasznahorkay, A. -- Kuti, I. -- Timar, J. -- Tornyi, T.] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary -- [Curien, D. -- Didierjean, F. -- Duche'ne, G. -- Lozeva, R. -- Sengele, L.] Univ Strasbourg, CNRS, IPHC, UMR 7178, F-67000 Strasbourg, France -- [Drouet, F. -- Vancraeyenest, A.] INPG PHELMA, 3 Parvis Louis Neel BP 257, F-38000 Grenoble 1, France -- [Eberhardt, K. -- Mokry, C. -- Runke, J.] Johannes Gutenberg Univ Mainz, Inst Kernchem, Fritz Strassmann Weg 2, D-55128 Mainz, Germany -- [Erturk, S.] Nigde Univ, Merkez Yerleske Bor Yolu Uzeri, TR-51240 Nigde, Turkey -- [Fraile, L. M. -- Olaizola, B. -- Paziy, V. -- Vedia, V.] Univ Complutense, Grp Fis Nucl, Fis Avda Complutense, Madrid 28040, Spain -- [Gottardo, A. -- Napoli, D. R. -- Wilson, E.] INFN, Lab Nazl Legnaro, Vialle Univ 2, I-35020 Legnaro, Italy -- [Grocutt, L. -- Mulholland, K. -- Scheck, M. -- Smith, J.] Univ West Scotland, High St, Paisley PA1 2BE, Renfrew, Scotland -- [Guerrero, C.] CERN, CH-1211 Geneva 23, Switzerland -- [Hartig, A. -L. -- Henrich, C. -- Ignatov, A. -- Ilieva, S. -- Kroell, T. -- Pietralla, N. -- Thuerauf, M. -- Werner, V.] Tech Univ Darmstadt, IKP, Schlossgartenstr 9, D-64289 Darmstadt, Germany -- [Ivanova, D. -- Kisyov, S.] Univ Sofia, Fac Phys, 5 James Bourchier Blvd, Sofia 1126, Bulgaria -- [John, R. -- Massarczyk, R. -- Schwengner, R.] Helmholtz Zentrum Dresden Rossendorf, POB 510119, D-01314 Dresden, Germany -- [Larijani, C.] Natl Phys Lab, Teddington Queens Rd, Teddington, Middx, England -- [Leguillon, R. -- Orlandi, R.] JAEA, Tokai Shirakata Shirane 2-4 Tokai, Naka, Ibaraki 3191195, Japan -- [Lica, R.] IFIN HH, Bucharest Str Atomistilor 407,POB MG 6, Bucharest 76900, Romania -- [Litaize, O. -- Regnier, D.] CEA Cadarache, F-13108 St Paul Les Durance, France -- [Magron, C.] Univ Bordeaux, CENBG Bordeaux, 1 Le Haut Vigneau, F-33170 Gradignan, France -- [Magron, C.] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Florence, Italy -- [Melon, B.] INFN, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy -- [Ramdhane, M.] LPSC Grenoble, 53 Ave Martyrs, F-38026 Grenoble, France -- [Oliver, R. J.] Univ Brighton, Sch Environm & Technol, Lewes Rd, Brighton, E Sussex BN2 4GJ, England -- [Singh, P.] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India -- [Tomandl, I.] ASCR, Nucl Phys Inst, Rez 25068, Czech Republic -- [Townsley, C.] Univ Sussex, Sch Sci & Technol, Brighton BN1 9QJ, E Sussex, England -- [Tuerler, A.] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland -- [Krticka, M. -- Valenta, S.] Prague Charles Univ, Fac Math & Phys, Ke Karlovu 5, Prague 12116, Czech Republic -- [Vanhoy, J.] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 USA, 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), 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), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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]), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-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: Instrumentation for neutron sources, Spectrometers, Physics::Instrumentation and Detectors, Gamma detectors (scintillators, CZT, HPG, HgI etc), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract: WOS: 000414625700003, In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., U.S. DOE grant [DE-FG02-91ER40609]; NUPNET; German BMBF [O5P12PKNUF, 05P15RDFN1, 05P12RDNUP]; German DFG contract [KR 1796/2-1]; Polish National Science Centre [DEC-2013/09/B/ST2/03485], This work has been partly supported by the Polish National Science Centre under contract DEC-2013/09/B/ST2/03485, the U.S. DOE grant No. DE-FG02-91ER40609, the NUPNET and the German BMBF under contracts O5P12PKNUF, 05P15RDFN1 and 05P12RDNUP and the German DFG contract KR 1796/2-1.
Published: 2017
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9. Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr

Author: Ansari, S, Régis, J-M, Jolie, J, Saed-Samii, N, Warr, N, Korten, W, Zielińska, M, Salsac, M-D, Blanc, A, Jentschel, M, Köster, U, Mutti, P, Soldner, T, Simpson, GS, Drouet, F, Vancraeyenest, A, de France, G, Clément, E, Stezowski, O, Ur, CA, Urban, W, Regan, PH, Podolyák, Zs, Larijani, C, Townsley, C, Carroll, R, Wilson, E, Mach, H, Fraile, LM, Paziy, V, Olaizola, B, Vedia, V, Bruce, AM, Roberts, OJ, Smith, JF, Scheck, M, Kröll, T, Hartig, A-L, Ignatov, A, Ilieva, S, Lalkovski, S, Mărginean, N, Otsuka, Taka, Shimizu, N, Togashi, T, and Tsunoda, Y
Subjects: Nuclear Experiment
Abstract: Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N≤58 nuclei are nearly spherical, while those with N≥60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A∼100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr, and 102Zr (N≥60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model. ispartof: Physical Review C vol:96 issue:5 status: published
Published: 2017

10. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author: Jentschel, M., Blanc, A., de France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Türler, Andreas, Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.
Subjects: Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, 540 Chemistry, 570 Life sciences, biology
Abstract: In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 n s−1cm−2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 105 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,γ)28Al and 35Cl(n,γ)36Cl in the energy range from 30 keV up to 10 MeV.
Published: 2017
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11. Abrupt shape transition at neutron number N = 60 : B ( E 2 ) values in $^{ 94 , 96 , 98}$Sr from fast $\gamma − \gamma$ timing

Author: Régis, M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., De France, G., Clément, E., Stezowski, O., Ur, A., Urban, W., Regan, H., Podolyák, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A., Roberts, O. J., Smith, J. F., Scheck, M., Kröll, T., Hartig, A., Ignatov, A., Ilieva, S., Lalkovski, S., Korten, W., Mărginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., Institut Laue-Langevin (ILL), ILL, 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]), 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), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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 Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
Published: 2017
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12. EXILL - a high efficiency, high resolution setup for γ-spectroscopy at an intense cold neutron beam

Author: Jentschel, M., Blanca, A., France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astieri, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka, N., Clement, E., Cooper, N., Crespic, F., Csatlos, M., Czerwinski, M., Danu, L., Davies, A., Didierjean, F., Drouet, F., Duchene, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B., John, R., Jolie, J., Kisyov, S., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kutiu, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Magron, C., Mancuso, C., Ruiz Martinez, E., Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsacq, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timaru, J., Toml, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.
Subjects: 235U, Ge detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, neutron-induced fission, multiple-γ coincidences, (n,γ)-reactions, 241Pu, angular correlations
Abstract: In the EXILL campaign a highly efficient array of HPGe detectors was operated at the cold neutron beam instrument PF1B of the Institut Laue-Langevin to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 s-1 cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two smaller clover detectors. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The trigger-less acquisition system allowed an event collection rate of up to 6 × 105 Hz. From triggerless collected data it was possible to construct decay schemes and in combination with the FATIMA array of LaBr3 detectors to analyze half-lives of excited levels in the pico- to micro-second range. Precise energy and efficiency calibrations of EXILL were performed using 27Al(n,γ)28Al and 35Cl(n,γ)36Cl reactions in the energy range from 30 keV up to 10 MeV.
Published: 2017

13. Experimental study of the lifetime and phase transition in neutron-rich $^{98,100,102}\mathrm{Zr}$

Author: Ansari, S, Régis, J.-M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielinska, M., Salsac, M.-D., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., Ur, C.A., Urban, W., Regan, P.H., Podolyák, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Mach, H., Fraile, L.M., Paziy, V., Olaizola, B., Vedia, V., Bruce, A.M., Roberts, O.J., Smith, J.F., Scheck, M., Kröll, T., Hartig, A.-L., Ignatov, A., Ilieva, S., Lalkovski, S., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, 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), 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), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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])
Subjects: Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N 58 nuclei are nearly spherical, while those with N 60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region.We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A ∼ 100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr,and 102Zr (N 60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.
Published: 2017
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14. EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility

Author: Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.
Abstract: In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., QC 20171121
Published: 2017
Full Text: View/download PDF

15. Abrupt shape transition at neutron number N=60: B(E2) values in Sr-94,Sr-96,Sr-98 from fast gamma-gamma timing

Author: Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Koster, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Scheck, M., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Lalkovski, S., Korten, W., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Koster, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Scheck, M., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Lalkovski, S., Korten, W., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., and Tsunoda, Y.
Abstract: Lifetimes of low-lying yrast states in neutron-rich Sr-94,Sr-96,Sr-98 have been measured by Germanium-gated gamma-gamma fast timing with LaBr3(Ce) detectors using the EXILL& FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N = 60 is identified as being caused by many-proton excitations to its g(9/2) orbit.
Published: 2017

16. Experimental study of the lifetime and phase transition in neutron-rich Zr-98,Zr-100,Zr-102

Author: Ansari, S., Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielinska, M., Salsac, M. -D., Blanc, A., Jentschel, M., Koster, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Mach, H., Fraile, L. M., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Scheck, M., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Lalkovski, S., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., Tsunoda, Y., Ansari, S., Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielinska, M., Salsac, M. -D., Blanc, A., Jentschel, M., Koster, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Mach, H., Fraile, L. M., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Scheck, M., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Lalkovski, S., Marginean, N., Otsuka, T., Shimizu, N., Togashi, T., and Tsunoda, Y.
Abstract: Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N <= 58 nuclei are nearly spherical, while those with N >= 60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of Pu-241 and U-235 to study lifetimes of excited states in fission fragments in the A similar to 100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei Zr-98 (N = 58), Zr-100, and Zr-102 (N >= 60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.
Published: 2017

17. Experimental study of the lifetime and phase transition in neutron-rich Zr98,100,102

Author: Ansari, S., primary, Régis, J.-M., additional, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Korten, W., additional, Zielińska, M., additional, Salsac, M.-D., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Mach, H., additional, Fraile, L. M., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional
Published: 2017
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18. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author: Jentschel, M., primary, Blanc, A., additional, de France, G., additional, Köster, U., additional, Leoni, S., additional, Mutti, P., additional, Simpson, G., additional, Soldner, T., additional, Ur, C., additional, Urban, W., additional, Ahmed, S., additional, Astier, A., additional, Augey, L., additional, Back, T., additional, Ba̧czyk, P., additional, Bajoga, A., additional, Balabanski, D., additional, Belgya, T., additional, Benzoni, G., additional, Bernards, C., additional, Biswas, D.C., additional, Bocchi, G., additional, Bottoni, S., additional, Britton, R., additional, Bruyneel, B., additional, Burnett, J., additional, Cakirli, R.B., additional, Carroll, R., additional, Catford, W., additional, Cederwall, B., additional, Celikovic, I., additional, Cieplicka-Oryńczak, N., additional, Clement, E., additional, Cooper, N., additional, Crespi, F., additional, Csatlos, M., additional, Curien, D., additional, Czerwiński, M., additional, Danu, L.S., additional, Davies, A., additional, Didierjean, F., additional, Drouet, F., additional, Duchêne, G., additional, Ducoin, C., additional, Eberhardt, K., additional, Erturk, S., additional, Fraile, L.M., additional, Gottardo, A., additional, Grente, L., additional, Grocutt, L., additional, Guerrero, C., additional, Guinet, D., additional, Hartig, A.-L., additional, Henrich, C., additional, Ignatov, A., additional, Ilieva, S., additional, Ivanova, D., additional, John, B.V., additional, John, R., additional, Jolie, J., additional, Kisyov, S., additional, Krticka, M., additional, Konstantinopoulos, T., additional, Korgul, A., additional, Krasznahorkay, A., additional, Kröll, T., additional, Kurpeta, J., additional, Kuti, I., additional, Lalkovski, S., additional, Larijani, C., additional, Leguillon, R., additional, Lica, R., additional, Litaize, O., additional, Lozeva, R., additional, Magron, C., additional, Mancuso, C., additional, Martinez, E. Ruiz, additional, Massarczyk, R., additional, Mazzocchi, C., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Mokry, C., additional, Mukhopadhyay, S., additional, Mulholland, K., additional, Nannini, A., additional, Napoli, D.R., additional, Olaizola, B., additional, Orlandi, R., additional, Patel, Z., additional, Paziy, V., additional, Petrache, C., additional, Pfeiffer, M., additional, Pietralla, N., additional, Podolyak, Z., additional, Ramdhane, M., additional, Redon, N., additional, Regan, P., additional, Regis, J.M., additional, Regnier, D., additional, Oliver, R. J., additional, Rudigier, M., additional, Runke, J., additional, Rza̧ca-Urban, T., additional, Saed-Samii, N., additional, Salsac, M.D., additional, Scheck, M., additional, Schwengner, R., additional, Sengele, L., additional, Singh, P., additional, Smith, J., additional, Stezowski, O., additional, Szpak, B., additional, Thomas, T., additional, Thürauf, M., additional, Timar, J., additional, Tom, A., additional, Tomandl, I., additional, Tornyi, T., additional, Townsley, C., additional, Tuerler, A., additional, Valenta, S., additional, Vancraeyenest, A., additional, Vandone, V., additional, Vanhoy, J., additional, Vedia, V., additional, Warr, N., additional, Werner, V., additional, Wilmsen, D., additional, Wilson, E., additional, Zerrouki, T., additional, and Zielinska, M., additional
Published: 2017
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19. Progress on the chemical separation of fission fragments from 236 Np produced by proton irradiation of natural uranium target

Author: Larijani, C., primary, Jerome, S.M., additional, Lorusso, G., additional, Ivanov, P., additional, Russell, B., additional, Pearce, A.K., additional, and Regan, P.H., additional
Published: 2017
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20. Destructive and non-destructive measurements of NORM in monazite-rich sands of Brazil

Author: Larijani, C., primary, Schwendner, P., additional, Cockell, C., additional, Ivanov, P., additional, Russell, B., additional, Aitken-Smith, P., additional, Pearce, A.K., additional, and Regan, P.H., additional
Published: 2017
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21. Erratum: Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing [Phys. Rev. C 95 , 054319 (2017)]

Author: Régis, J.-M., primary, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Pfeiffer, M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Fraile, L. M., additional, Mach, H., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Korten, W., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional
Published: 2017
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22. Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing

Author: Régis, J.-M., primary, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Pfeiffer, M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Fraile, L. M., additional, Mach, H., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Scheck, M., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Lalkovski, S., additional, Korten, W., additional, Mărginean, N., additional, Otsuka, T., additional, Shimizu, N., additional, Togashi, T., additional, and Tsunoda, Y., additional
Published: 2017
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23. Publisher's Note: Half-life of the 15/2+ state of I135 : A test of E2 seniority relations [Phys. Rev. C 95 , 021302(R) (2017)]

Author: Spagnoletti, P., primary, Simpson, G. S., additional, Carroll, R., additional, Régis, J.-M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, de France, G., additional, Ur, C. A., additional, Urban, W., additional, Bruce, A. M., additional, Drouet, F., additional, Fraile, L. M., additional, Gaffney, L. P., additional, Ghită, D. G., additional, Ilieva, S., additional, Jolie, J., additional, Korten, W., additional, Kröll, T., additional, Larijani, C., additional, Lalkovski, S., additional, Lică, R., additional, Mach, H., additional, Mărginean, N., additional, Paziy, V., additional, Podolyák, Zs., additional, Regan, P. H., additional, Scheck, M., additional, Saed-Samii, N., additional, Thiamova, G., additional, Townsley, C., additional, Vancraeyenest, A., additional, Vedia, V., additional, Gargano, A., additional, and Van Isacker, P., additional
Published: 2017
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24. $B(E2; 2_1^+ \to 0_1^+)$ value in $^{90}Kr$

Author: Régis, J.-M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyák, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Kröll, T., Hartig, A.-L., Ignatov, A., Ilieva, S., Thürauf, M., Lalkovski, S., Ivanova, D., Kisyov, S., Korten, W., Salsac, M.-D., Zielińska, M., Mărginean, N., Ghită, D. G., Lică, R., Petrache, C. M., Astier, A., Leguillon, R., Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), 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), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 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), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; A smooth onset of collectivity in Kr-88,Kr-92,Kr-94,Kr-96 has been determined from reported B(E2; 2(1)(+) -> 0(1)(+)) and E(2(1)(+)) values. This is in contrast to the sudden onset in even-even Zr, Mo, and Sr isotopes. Our objective was to complete the systematics by determining the B(E2; 2(1)(+) -> 0(1)(+)) value in Kr-90, which was produced by cold-neutron-induced fission of U-235. The lifetime of the 2(1)(+) state in Kr-90 was measured via the electronic gamma-gamma timing technique using the EXILL and FATIMA spectrometers. Based on themeasured mean lifetime of tau = 15(10) ps, the B(E2; 2(1)(+) -> 0(1)(+)) value of 13(-5)(+26) W.u. in Kr-90 is determined for the first time and the smooth onset of deformation in the even-even Kr isotopes beyond neutron number N = 50 is confirmed.
Published: 2014
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25. Progress towards the production of the 236gNp standard sources and competing fission fragment production

Author: Larijani, C., primary, Pickford, O.L., additional, Collins, S.M., additional, Ivanov, P., additional, Jerome, S.M., additional, Keightley, J.D., additional, Pearce, A.K., additional, and Regan, P.H., additional
Published: 2015
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26. Development of NANA: A Fast-Scintillator, Coincidence Gamma-ray Array for Radioactive Source Characterisation and Absolute Activity Measurements at the UK National Physical Laboratory

Author: Regan, P H, primary, Shearman, R, additional, Judge, S M, additional, Lorusso, G, additional, Main, P, additional, Bell, S, additional, Collins, S M, additional, Ivanov, P, additional, Jerome, S M, additional, Keightley, J D, additional, Larijani, C, additional, Lotay, G, additional, and Pearce, A K, additional
Published: 2015
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27. B(E2; 2(1)(+) -> 0(1)(+)) value in Kr-90

Author: Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Koester, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Thuerauf, M., Lalkovski, S., Ivanova, D., Kisyov, S., Korten, W., Salsac, M. -D., Zielinska, M., Marginean, N., Ghita, D. G., Lica, R., Petrache, C. M., Astier, A., Leguillon, R., Regis, J. -M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Koester, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C. A., Urban, W., Regan, P. H., Podolyak, Zs., Larijani, C., Townsley, C., Carroll, R., Wilson, E., Fraile, L. M., Mach, H., Paziy, V., Olaizola, B., Vedia, V., Bruce, A. M., Roberts, O. J., Smith, J. F., Kroell, T., Hartig, A. -L., Ignatov, A., Ilieva, S., Thuerauf, M., Lalkovski, S., Ivanova, D., Kisyov, S., Korten, W., Salsac, M. -D., Zielinska, M., Marginean, N., Ghita, D. G., Lica, R., Petrache, C. M., Astier, A., and Leguillon, R.
Abstract: A smooth onset of collectivity in Kr-88,Kr-92,Kr-94,Kr-96 has been determined from reported B(E2; 2(1)(+) -> 0(1)(+)) and E(2(1)(+)) values. This is in contrast to the sudden onset in even-even Zr, Mo, and Sr isotopes. Our objective was to complete the systematics by determining the B(E2; 2(1)(+) -> 0(1)(+)) value in Kr-90, which was produced by cold-neutron-induced fission of U-235. The lifetime of the 2(1)(+) state in Kr-90 was measured via the electronic gamma-gamma timing technique using the EXILL and FATIMA spectrometers. Based on themeasured mean lifetime of tau = 15(10) ps, the B(E2; 2(1)(+) -> 0(1)(+)) value of 13(-5)(+26) W.u. in Kr-90 is determined for the first time and the smooth onset of deformation in the even-even Kr isotopes beyond neutron number N = 50 is confirmed.
Published: 2014

28. Progress on the chemical separation of fission fragments from 236Np produced by proton irradiation of natural uranium target.

Author: Larijani, C., Jerome, S.M., Lorusso, G., Ivanov, P., Russell, B., Pearce, A.K., and Regan, P.H.
Subjects: *URANIUM, *RADIOCHEMICAL separation, *PHOTON beams, *RADIOCHEMISTRY, *INDUCTIVELY coupled plasma mass spectrometry
Abstract: The aim of the current work is to develop and validate a radiochemical separation scheme capable of separating both 236g Np and 236 Pu from a uranium target of natural isotopic composition (~1 g uranium) and ~200 MBq of fission decay products. A target containing 1.2 g of UO 2 was irradiated with a beam of 25 MeV protons with a typical beam current of 30 μA for 19 h in December 2013 at the University of Birmingham Cyclotron facility. Using literature values for the production cross-section for fusion of protons with uranium targets, we estimate that an upper limit of approximately 250 Bq of activity from the 236 Np ground state was produced in this experiment. Using a radiochemical separation scheme, Np and Pu fractions were separated from the produced fission decay products, with analyses of the target-based final reaction products made using Inductively Couple Plasma Mass Spectrometry (ICP-MS) and high-resolution α particle and γ-ray spectrometry. [ABSTRACT FROM AUTHOR]
Published: 2017
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29. B(E2;21+→01+)value inKr90

Author: Régis, J.-M., primary, Jolie, J., additional, Saed-Samii, N., additional, Warr, N., additional, Pfeiffer, M., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Drouet, F., additional, Vancraeyenest, A., additional, de France, G., additional, Clément, E., additional, Stezowski, O., additional, Ur, C. A., additional, Urban, W., additional, Regan, P. H., additional, Podolyák, Zs., additional, Larijani, C., additional, Townsley, C., additional, Carroll, R., additional, Wilson, E., additional, Fraile, L. M., additional, Mach, H., additional, Paziy, V., additional, Olaizola, B., additional, Vedia, V., additional, Bruce, A. M., additional, Roberts, O. J., additional, Smith, J. F., additional, Kröll, T., additional, Hartig, A.-L., additional, Ignatov, A., additional, Ilieva, S., additional, Thürauf, M., additional, Lalkovski, S., additional, Ivanova, D., additional, Kisyov, S., additional, Korten, W., additional, Salsac, M.-D., additional, Zielińska, M., additional, Mărginean, N., additional, Ghită, D. G., additional, Lică, R., additional, Petrache, C. M., additional, Astier, A., additional, and Leguillon, R., additional
Published: 2014
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30. Consensus evaluation of radioactivity-in-soil reference materials in the context of an NPL Environmental Radioactivity Proficiency Test Exercise.

Author: Dean J, Collins S, Garcia Miranda M, Ivanov P, Larijani C, and Woods S
Abstract: The development of two radioactivity-in-soil reference materials is described - one for peat and one for soil with high sand content. Each bulk material was processed, subdivided and measured before being sent to participants in an NPL Environmental Radioactivity Proficiency Test Exercise. Activity concentrations of radionuclides in each material were determined by 'consensus' evaluations of participants' results using two weighted mean methods. The project demonstrated the use of such exercises in delivering reference materials to the user community., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
Published: 2017
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31. Advancements in NORM metrology - Results and impact of the European joint research project MetroNORM.

Author: Josef Maringer F, Baumgartner A, Cardellini F, Cassette P, Crespo T, Dean J, Wiedner H, Hůlka J, Hult M, Jerome S, Kabrt F, Kovář P, Larijani C, Lutter G, Marouli M, Mauring A, Mazánová M, Michalik B, Michielsen N, Peyres V, Pierre S, Pöllänen R, Pommé S, Reis M, Stietka M, Szücs L, and Vodenik B
Abstract: The results of the three years European Metrology Research Programme's (EMRP) joint research project 'Metrology for processing materials with high natural radioactivity' (MetroNORM) are presented. In this project, metrologically sound novel instruments and procedures for laboratory and in-situ NORM activity measurements have been developed. Additionally, standard reference materials and sources for traceable calibration and improved decay data of natural radionuclides have been established., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
Published: 2017
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32. Preparation of proton rich radionuclides in support of radiochemical analysis.

Author: Jerome S, Larijani C, and Parker D
Subjects: Half-Life, Internationality, Protons, Radiation Dosage, Radiochemistry standards, Reference Standards, Reference Values, Isotope Labeling methods, Isotope Labeling standards, Plutonium chemistry, Plutonium standards, Technetium chemistry, Technetium standards
Abstract: The production of proton rich radionuclides supports a wide range of radiochemical analyses via radioactive yield tracers ((95m)Tc and (236)Pu). In recent years, NPL and the University of Birmingham cyclotron have collaborated to produce these, and other, radionuclides., (Copyright © 2012. Published by Elsevier Ltd.)
Published: 2012
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33. A Urease-Based pH Photoswitch: A General Route to Light-to-pH Transduction.

Author: Ivanov NM, Slivkov AI, and Huck WTS
Abstract: New approaches for the integration of chemical and physical stimuli to control the dynamics of artificial enzymatic reaction networks (ERNs) are needed. Here, we present a general approach to convert a light stimulus into a time-programmed pH response. We developed and characterized a panel of photoswitchable inhibitors of urease. Urease activity, now regulated by light via the photoinhibitors, leads to an increase in pH upon hydrolysis of urea into ammonia. Careful choice of characteristics of light, and concentrations of enzyme, substrate, and photoinhibitor, allowed us to control the timing of the pH transition. Furthermore, as all enzymes have an activity-pH profile, the urease photoinhibitor system can be used to regulate the activities of other enzymes in small reaction networks., (© 2024 The Author(s). Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Published: 2024
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34. Framework of Affordances for Virtual Reality and Augmented Reality.

Author: Steffen, Jacob H., Gaskin, James E., Meservy, Thomas O., Jenkins, Jeffrey L., and Wolman, Iopa
Subjects: VIRTUAL reality, AUGMENTED reality, STRUCTURAL frames, QUANTITATIVE research, QUALITATIVE research
Abstract: Virtual reality (VR) and augmented reality (AR) technologies continue to grow and present possibilities to change the ways we learn, accomplish tasks, and interact with the world. However, widespread adoption has continually languished below purported potential. We suggest that a more complete understanding of the underlying motives driving users to take advantage of VR and AR would aid researchers by consolidating fragmented knowledge across domains and by identifying paths for additional inquiry. Additionally, practitioners could identify areas of unmet motives for using VR and AR. To examine the motives for virtualization, we draw upon Gibson's seminal work on affordances to create a framework of generalized affordances for virtually assisted activities relative to the affordances of physical reality. This framework facilitates comparison of virtualized activities to non-virtualized activities, comparison of similar activities across VR and AR, and delineates areas of inquiry for future research. The validity of the framework was explored through two quantitative studies and one qualitative study of a wide variety of professionals. We found that participants perceive a significant difference between physical reality and both VR and AR for all proposed affordances, and that for many affordances, users perceive a difference in the ability of AR and VR to enact them. The qualitative study confirmed the general structure of the framework, while also revealing additional sub-affordances to explore. Theoretically, this suggests that examining the affordances that differentiate these technologies from physical reality may be a valid approach to understanding why users adopt these technologies. Practitioners may find success by focusing development on the specific affordances that VR or AR is best equipped to enact. [ABSTRACT FROM AUTHOR]
Published: 2019
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35. RADIOLOGICAL IMPACT OF USING DECORATIVE GRANITE AS AN ATTENUATOR OF IONIZING RADIATION.

Author: Hassan, Nabil M and Lee, J B
Subjects: RADIOACTIVITY, IONIZING radiation, MASS attenuation coefficients, GRANITE, GAMMA rays, GERMANIUM detectors
Abstract: Granite is a widely available rock, which can be used as a shielding material, for bulk in the form of the aggregate in concrete. It has the weakness that it is more radioactive than many other rocks, which can be used in concrete. This paper looks at its properties as a shielding material and the activity level. Thus, the concentrations of 226Ra, 232Th and 40K, in granite were measured using a high pure germanium detector (HPGe). They were ranged from (15 ± 4 to 49 ± 5) Bq kg−1 for 226Ra, (22 ± 4 to 78 ± 4 Bq kg−1) for 232Th and (791 ± 13 to 1231 ± 15 Bq kg−1) for 40K. Radiological indices of radium equivalent concentration (Raeq), external (Hex), internal (Hin) and annual effective dose were less than worldwide recommended limits. The results emphasized, the granite samples had no radiation hazard. Nevertheless, the mass attenuation coefficients of granite samples were measured for the gamma rays of energy range 122–1408 keV. The mass attenuation coefficients of the studied granite samples were ranged from 0.05 to 0.15 cm2 g−1. In addition, the average the half-value layer of granite was varied from 1.8 cm for 122 keV to 5.2 cm for 1408 keV. The results are that the attenuation characteristics are typical and match the values given by NIST for 'concrete' and that the activity levels of the samples examined are acceptable. Thus the granite may be used as an attenuator for ionizing radiation. [ABSTRACT FROM AUTHOR]
Published: 2023
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36. Unsupervised pattern-recognition and radiological risk assessment applied to the evaluation of behavior of rare earth elements, Th, and U in monazite sand.

Author: Wyatt, Nathalia Luiza P., Costa, Vinicius C., de Souza, Jefferson R., Ferde, Merisnet, Costa, Floriatan S., Neris, Jordan B., Brandão, Geisamanda P., Guedes, Wesley N., and Carneiro, Maria Tereza W. D.
Subjects: INDUCTIVELY coupled plasma mass spectrometry, RARE earth metals, BEHAVIORAL assessment, MONAZITE, RISK assessment
Abstract: The Brazilian coast is rich in monazite which is found in beach sand deposits. In this study, the composition of the monazite sands from beaches of State of Espírito Santo, Brazil, was investigated. The concentrations of rare earth elements (REEs), Th, and U were determined by inductively coupled plasma mass spectrometry (ICP-MS). In the studied region, the mean concentration of investigated elements increased in the following order: Tm < Yb < Ho < Lu < Eu < Er < Tb < Dy < U < Y < Th < Gd < Sm < Pr < Nd < La < Ce. The sampling sites were classified into three clusters and discriminated by the concentrations of REEs, Th, and U found. In general, the radiological risk indices were higher than the established limits, and the risk of developing cancer was estimated to be higher than the world average. [ABSTRACT FROM AUTHOR]
Published: 2022
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37. Application of plutonium radiochronometry to the analysis of plutonium age dating reference materials.

Author: Higginson, Matthew A., Dunne, James A., Gilligan, Chris R. D., Cross, Samuel T. J., Dunn, Stuart, and Varga, Zsolt
Subjects: REFERENCE sources, URANIUM isotopes, PLUTONIUM, URANIUM, MATERIALS analysis, MATERIALS testing
Abstract: Radiochronometry is an important tool for nuclear forensic analysis. Plutonium has a wide array of parent/progeny pairs that can be measured to provide multiple model ages for interpretation. Various methods have been developed to provide data within specified timescales, to varied precision and accuracy requirements. In contrast to uranium, no radiochronometry reference standards currently exist for these measurements and we rely on traceability to activity and isotopic certified materials. A test reference material was provided for a blind laboratory analysis. We present analysis of this material by current techniques to increase confidence to the suitability of this methodology for certification. [ABSTRACT FROM AUTHOR]
Published: 2022
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38. Electron Beam Lithography Nanopatterning of Plasma Polymers.

Author: Askew, Hannah J., Jarvis, Karyn L., Jones, Robert T., and McArthur, Sally L.
Subjects: ELECTRON beam lithography, NANOPATTERNING, SINGLE cell proteins, TIME-of-flight mass spectrometry, ATOMIC force microscopy
Abstract: Chemically patterned surfaces for biotechnology applications often require sub‐micron patterns to match specific sub‐cellular structures and control the presentation of proteins to single cell arrays. Plasma polymer coatings are used extensively in the biotechnology sector for biomaterials, cell culture and tissue engineering, but their patterning has not been investigated at the sub‐micron level. The resolution limit of plasma polymerized patterns with designed line widths of 900 to 20 nm is investigated via dual chemistry patterns of plasma polymerized acrylic acid and allylamine created with poly (methyl methacrylate) resist and electron beam lithography (EBL). Line widths are characterized via scanning electron microscopy and atomic force microscopy with surface chemistry analysis via time‐of‐flight secondary‐ion mass spectrometry (ToF‐SIMS). The smallest line width measured is 29 nm for a designed line width of 20 nm. High‐resolution nanoscale imaging is achieved using ToF‐SIMS, with lines down to ≈60 nm in width visible. This work demonstrates the successful fabrication and characterization of sub 100 nm dual plasma polymer patterns using EBL, establishing a clear route for large scale production of plasma polymerized nanopatterning. [ABSTRACT FROM AUTHOR]
Published: 2021
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39. Monitoring Large Railways Infrastructures Using Hybrid Optical Fibers Sensor Systems.

Author: Velha, Philippe, Nannipieri, Tiziano, Signorini, Alessandro, Morosi, Mirko, Solazzi, Massimiliano, Barone, Francesco, Frisoli, Antonio, Ricciardi, Luca, Eusepi, Ricardo, Icardi, Marco, Recchia, Giuseppe, Lupi, Margherita, Arcoleo, Giuseppe, Firmi, Paola, and Di Pasquale, Fabrizio
Abstract: In this paper we propose a hybrid fiber optics sensor system, based on Fiber Bragg Gratings (FBG) and Raman distributed temperature sensing (RDTS), for monitoring essential sites within large railway infrastructures like bridges, viaducts and slopes potentially subject to landslides. The geometrical rail track condition is monitored in real-time using fiber optic sensors, providing early warning if pre-defined thresholds are exceeded in terms of longitudinal, horizontal and cross-level defects. The sensor reading units can be remotely located from the monitored zones, without requiring active elements on the tracks and ensuring high immunity to electromagnetic interference. The proposed technology has been first validated in railway laboratories and then in field trials confirming its capability to detect defects over pre-established thresholds and the absence of false alarms with regular train circulation. [ABSTRACT FROM AUTHOR]
Published: 2020
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40. Effect of Carbon in Severe Plastically Deformed Metals.

Author: Bachmaier, Andrea, Pippan, Reinhard, and Renk, Oliver
Subjects: NANOSTRUCTURED materials, BULK solids, METALS, NANODIAMONDS, GRAIN refinement, MATERIAL plasticity, GRAPHITE
Abstract: In the last decades severe plastic deformation techniques have gained increasing interest as they allow the production of bulk nanostructured materials with superior mechanical and functional properties. However, because of mechanically induced grain boundary migration, the achievable grain size reduction is not indefinite but tends to stagnate once sufficient strain has been applied. Consequently, addition of solute elements or second phase particles offers the possibility to access the true nanocrystalline regime. Due to their low solubility and high mobility, interstitial elements are extremely effective at subduing boundary migration. Herein the effect of carbon on grain refinement and the resulting mechanical properties are summarized. As carbon may not only be added as graphite but could also be introduced in other forms or as allotropes such as nanotubes, nanodiamonds, or carbides, the respective advantages and problems associated with it are the center of discussion. Independent of the strategy used, strength levels hardly achievable with other alloying elements can be obtained. Moreover, as carbon does not have a negative effect on grain boundary cohesion, despite the enormous strength levels even ductility and toughness can be widely maintained. [ABSTRACT FROM AUTHOR]
Published: 2020
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41. Evaluation of uncertainties in environmental impact assessment of naturally occurring radiation exposure situations on example of undisturbed and legacy NORM sites in the Fen Complex, Norway.

Author: Popic, Jelena Mrdakovic and Skipperud, Lindis
Subjects: ENVIRONMENTAL impact analysis, RADIATION exposure, UNCERTAINTY, RADIOACTIVE substances, RADIATION sources, PARTITION coefficient (Chemistry)
Abstract: The risk from naturally occurring radioactive materials (NORM) has been extensively assessed, and this has led to the integration of specific NORM radiation protection requirements within the latest EU Directive 2013/59. Nevertheless, it has been internationally recognised that remaining NORM knowledge gaps and uncertainties now present similarly significant issues in addressing recent regulatory requirements. The multi-tiered nature of environmental impact assessment (EIA) implies per se possibility for uncertainties, but when EIA at radiation exposure sites includes consideration of sites with multiple radiation and contamination sources, different ecosystem transport pathways, effects and risks by applying different parameters and models, level of overall uncertainty increases. The results of EIA study in the Fen area in Norway, comprised of undisturbed and legacy NORM sites, have been evaluated in this analysis, in order to identify all existing input uncertainties and how they may impact the final conclusions, and thus, influence any subsequent decision-making. The main uncertainties have been identified in the measurement and exposure analysis tier, and were related to the heterogeneous distribution of radionuclides, radionuclide speciation, as well as to generic variability issues in the concepts used for mobility and biota uptake analysis (such as distribution coefficient, transfer factors and concentration ratios) as well as radioecological modelling. The uncertainties in the input values to the calculation of the dose arising from radon exposure in the Fen area led to an overall elevated uncertainty of the magnitude of the radiation exposure dose of humans. It has been concluded that an integrated, ecosystem-based approach with consideration of complexity of prevailing environmental conditions and interconnections must be applied to fully understand possible radiation effects and risks. [ABSTRACT FROM AUTHOR]
Published: 2020
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42. Lifetime measurement in neutron-rich A~100 nuclei.

Author: Köster, U., Ansari, S., Régis, J-M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., Zielińska, M., Salsac, M.-D., Blanc, A., Jentschel, M., Mutti, P., Soldner, T., Simpson, G.S., Drouet, F., Vancraeyenest, A., de France, G., Clément, E., Stezowski, O., and Ur, C.A.
Subjects: EXCITED states, ZIRCONIUM, CENTROID, DEFORMATIONS (Mechanics), MONTE Carlo method
Abstract: Lifetimes of excited states of the 98;100;102Zr nuclei were measured by using the Generalized Centroid Difference Method. The nuclei of interest were populated via neutron-induced fission of 241Pu and 235U during the EXILL-FATIMA campaign. The obtained lifetimes were used to calculate the B(E2) transition strengths and β deformation parameters which were then compared with the recent theoretical predictions obtained with Monte Carlo Shell Model. [ABSTRACT FROM AUTHOR]
Published: 2018

43. Radioactivity and radiological impact of industrial raw materials in Korea.

Author: Hassan, N. M. and Chae, J. S.
Subjects: RADIOACTIVITY, CONSTRUCTION materials, MATERIALS, RAW materials, NUCLEAR energy, RADIOISOTOPES, THORIUM
Abstract: Natural radionuclides of 226Ra (238U), 232Th, and 40K in raw materials used in building and cosmetic materials produced in Korea were measured using a γ-ray spectrometer (HPGe). The radionuclide concentrations ranged from 0.06 ± 0.01 to 4.13 ± 0.21 Bq g−1 for 226Ra, 0.08 ± 0.01 to 33.6 ± 1.9 Bq g−1 for 232Th, and from minimum detectable activity to 4.06 ± 0.36 Bq g−1 for 40K, respectively. The 226Ra and 232Th contents in a majority of samples were higher than the exemption level recommended by the International Atomic Energy Agency of 1 Bq g−1 for 226Ra and 232Th and 10 Bq g−1 for 40K; however, the 40K content in all the selected raw materials was lower than this level. Moreover, it was observed that these materials were richer in thorium than uranium, which implies that these raw materials contain variable amounts of monazite ore. Radiological indices of radium equivalent, gamma-index, absorbed radiation, and equivalent gamma-doses were also calculated. The results indicate a potential radiation hazard, which highlight the necessity of radiation-regulation and routine monitoring. [ABSTRACT FROM AUTHOR]
Published: 2019
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44. Complete dissolution of solid matrices using automated borate fusion in support of nuclear decommissioning and production of reference materials.

Author: Braysher, E., Russell, B., Woods, S., García-Miranda, M., Ivanov, P., Bouchard, B., and Read, D.
Subjects: NUCLEAR fusion, REFERENCE sources, NUCLEAR industry, BORATES, COMPLEX matrices
Abstract: Accurate measurement of natural and anthropogenic radionuclide concentrations is of critical importance to end users in the nuclear sector to ensure correct classification prior to storage, recycling, reprocessing or disposal. Uncertainties in the characterisation of solid matrices and materials could lead to safety, quality and financial implications. Robust sample preparation methods are vital, in particular effective sample digestion, as under-estimated chemical yield recovery results in a corresponding under-estimation of activity levels. Borate fusion has been proven to effectively digest a range of complex sample matrices in the geosciences but is not used routinely elsewhere. In this study, we describe an automated procedure for borate fusion of multiple matrices encountered in nuclear decommissioning, containing diverse radionuclides over a range of activity concentrations. The impact of digestion flux, sample mass and sample to flux ratios are described, as well as the subsequent separation and measurement techniques. The results contribute to accurate and precise measurement of radionuclides in various matrices, as well as to characterisation of reference materials, providing greater confidence in nuclear industry programmes worldwide. [ABSTRACT FROM AUTHOR]
Published: 2019
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45. Dissolution and radioactive characterization of resistate zircon sand.

Author: Crespo, M. Teresa, Peyres, Virginia, Ortiz, M. José, Gómez-Mancebo, M. Belén, and Sánchez, Miguel
Subjects: ZIRCONIUM isotopes, URANIUM isotopes, THORIUM isotopes, RADIOISOTOPES, DISSOLUTION (Chemistry), GAMMA ray spectrometry, RADIOACTIVE equilibrium
Abstract: Zircon sand plays an important role in the ceramic industry. The presence of the long-lived radionuclides of uranium and thorium in the zircon sand means this material should be considered as NORM and therefore it is necessary to determine the makeup of the radionuclides present and their activity concentration. In this paper, a simple method of total sample dissolution has been set up for its subsequent measurement by alpha-particle spectrometry. Gamma spectrometry and alpha-particle spectrometry have been jointly used to determine the radionuclide content and also to check the condition of radioactive equilibrium among the radionuclides, commonly used in gamma spectrometry. [ABSTRACT FROM AUTHOR]
Published: 2018
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46. Comparative study of precise measurements of natural radionuclides and radiation dose using in-situ and laboratory γ-ray spectroscopy techniques.

Author: Hassan, N. M., Kim, Y. J., Jang, J., Chang, B. U., and Chae, J. S.
Published: 2018
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47. Soy product consumption and the risk of all-cause, cardiovascular and cancer mortality: a systematic review and meta-analysis of cohort studies.

Author: Namazi, Nazli, Saneei, Parvane, Larijani, Bagher, and Esmaillzadeh, Ahmad
Published: 2018
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48. Lipid Internal Dynamics Probed in Nanodiscs.

Author: Martinez, Denis, Decossas, Marion, Kowal, Julia, Frey, Lukas, Stahlberg, Henning, Dufourc, Erick J., Riek, Roland, Habenstein, Birgit, Bibow, Stefan, and Loquet, Antoine
Published: 2017
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49. Vanadium(iv and v) complexes of pyrazolone based ligands: Synthesis, structural characterization and catalytic applications.

Author: Maurya, Mannar R., Sarkar, Bithika, Avecilla, Fernando, and Correia, Isabel
Subjects: VANADIUM, PYRAZOLONES, DIHYDROPYRIDINE, AROMATIZATION, CATALYTIC oxidation, THERMOGRAVIMETRY, X-ray diffraction
Abstract: The ONO donor ligands obtained from the condensation of 4-benzoyl-3-methyl-1-phenyl-2-pyrazoline-5-one (Hbp) with benzoylhydrazide (H2bp-bhz I), furoylhydrazide (H2bp-fah II), nicotinoylhydrazide (H2bp-nah III) and isonicotinoylhydrazide (H2bp-inh IV), upon treatment with [VIVO(acac)2], lead to the formation of [VIVO(bp-bhz)(H2O)] 1, [VIVO(bp-fah)(H2O)] 2, [VIVO(bp-nah)(H2O)] 3 and [VIVO(bp-inh)(H2O)] 4, respectively. At neutral pH the in situ generated aqueous K[H2VVO4] reacts with ligands I and II, forming potassium salts, K(H2O)2[VVO2(bp-bhz)] 5 and K(H2O)2[VVO2(bp-fah)] 6, while ligands III and IV give neutral complexes, [VVO2(Hbp-nah)] 9 and [VVO2(Hbp-inh)] 10, respectively. Acidification of aqueous solutions of 5 and 6 with HCl also gives neutral complexes [VVO2(Hbp-bhz)] 7 and [VVO2(Hbp-fah)] 8, respectively. Complexes 1–4, upon slow aerial oxidation in methanol, convert into monooxidovanadium(v) complexes, [VVO(bp-bhz)(OMe)] 11, [VVO(bp-fah)(OMe)] 12, [VVO(bp-nah)(OMe)] 13 and [VVO(bp-inh)(OMe)] 14, respectively. All complexes were characterized by various spectroscopic techniques like FT-IR, UV-visible, EPR (for complexes 1–4) and NMR (1H, 13C and 51V), elemental analysis, thermogravimetry and single crystal X-ray diffraction (for complexes 5–10 and 12). In the solid state, all complexes characterized by X-ray diffraction show the metal ion 5-coordinated in a distorted square pyramidal geometry. Complexes 11–14 were tested as catalysts for the one-pot three-component (ethylacetoacetate, benzaldehyde and ammonium acetate) dynamic covalent assembly, via Hantzsch reaction, using hydrogen peroxide as oxidant in solution and under solvent-free conditions. The complexes are also active catalysts for the oxidation of tetralin to tetralone with H2O2 as oxidant. The influence of the amounts of catalyst and oxidant, and solvent, temperature and time on the catalyzed reactions was investigated. [ABSTRACT FROM AUTHOR]
Published: 2016
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50. New metal complexes supported on Fe3O4 magnetic nanoparticles as recoverable catalysts for selective.

Author: Hajjami, Maryam and Kolivand, Somaye
Subjects: METAL complexes, MAGNETIC nanoparticles, IRON compounds, ZIRCONIUM compounds, SURFACE coatings, SULFOXIDES
Abstract: Fe3O4 nanoparticles were coated with aminopropyltriethoxysilane and subsequently reacted with isatin to obtain imine-bonded Fe3O4 nanoparticles. The addition of ZrOCl2⋅8H2O or CuCl2 led to the formation of complexes of Zr(IV)/isatin@Fe3O4 or Cu (II)/isatin@Fe3O4 as new magnetically separable catalysts. The synthesized catalysts were characterized using various techniques. These catalysts are shown to be efficient for chemo-selective using as oxidative agent. This system has many advantages, such as excellent level of reusability of magnetic catalysts, high yields, simplicity of separation of catalysts using an external magnet, environmental benignity and ease of handling. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
Published: 2016
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