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152. Reinterpretation of excited states in 212 Po: Shell-model multiplets rather than α-cluster states

Author

Fernández, A., Jungclaus, A., Golubev, P., Rudolph, D., Sarmiento, L. G., Gargano, A., Naïdja, H., Astier, A., Dupont, E., Gadea, A., Nacher, E., Perea, A., Wimmer, K., Clément, E., Frémont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H. J., Ljungvall, J., Ménager, L., Perez-Vidal, R. M., Petrache, C. M., Ralet, D., Ropert, J. A., Saillant, F., Samark-Roth, A., Simpson, G. S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lalovic, N., Lorentz, C., Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Bracco, A., Ciemala, M., Collado, J., Cullen, D. M., Domingo-Pardo, C., Eberth, J., Gonzalez, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D.R., Nyberg, J., Podolyák, Z., Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, C., and Valiente-Dobón, J.J.

Abstract

A γ-ray spectroscopic study of 212Po was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction 12C(208Pb,212Po)8Be and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1− and 2− and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of 212Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4−), 1751 (8−), 1787 (6−), 1946 (4−), 1986 (8−), and 2016 (6−) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of 212Po is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 6+1 yrast state, and exclusive reaction cross sections.

Published
2021

156. 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

160. Shape coexistence and isospin symmetry in = 70 nuclei: Spectroscopy of the = −1 Nucleus Kr

Author

Wimmer, K., Korten, W., Arici, T., Doornenbal, P., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D.T., Gerl, J., Gernhäuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T.Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

Excited states in the Tz=−1 nucleus $^{70}$Kr have been populated using inelastic scattering of a radioactive $^{70}$Kr beam as well as one- and two-neutron removal reactions from $^{71,72}$Kr at intermediate beam energies. The level scheme of $^{70}$Kr was constructed from the observed γ-ray transitions and coincidences. Tentative spin and parity assignments were made based on comparison with the mirror nucleus $^{70}$Se. A second 2+ state and a candidate for the corresponding 42+ state suggest shape coexistence in $^{70}$Kr.

Published
2018

161. Quadrupole collectivity in Ca-42 from low-energy Coulomb excitation with AGATA

Author

Hadynska-Klek, K, Napiorkowski, PJ, Zielinska, M, Srebrny, J, Maj, A, Azaiez, F, Dobon, JJ Valiente, Kicinska-Habior, M, Nowacki, F, Naidja, H, Bounthong, B, Rodriguez, TR, de Angelis, G, Abraham, T, Kumar, G Anil, Bazzacco, D, Bellato, M, Bortolato, D, Bednarczyk, P, Benzoni, G, Berti, L, Birkenbach, B, Bruyneel, B, Brambilla, S, Camera, F, Chavas, J, Cederwall, B, Charles, L, Ciemala, M, Cocconi, P, Coleman-Smith, P, Colombo, A, Corsi, A, Crespi, FCL, Cullen, DM, Czermak, A, Desesquelles, P, Doherty, DT, Dulny, B, Eberth, J, Farnea, E, Fornal, B, Franchoo, S, Gadea, A, Giaz, A, Gottardo, A, Grave, X, Grebosz, J, Gorgen, A, Gulmini, M, Habermann, T, Hess, H, Isocrate, R, Iwanicki, J, Jaworski, G, Judson, DS, Jungclaus, A, Karkour, N, Kmiecik, M, Karpinski, D, Kisielinski, M, Kondratyev, N, Korichi, A, Komorowska, M, Kowalczyk, M, Korten, W, Krzysiek, M, Lehaut, G, Leoni, S, Ljungvall, J, Lopez-Martens, A, Lunardi, S, Maron, G, Mazurek, K, Menegazzo, R, Mengoni, D, Merchan, E, Meczynski, W, Michelagnoli, C, Million, B, Myalski, S, Napoli, DR, Niikura, M, Obertelli, A, Ozmen, SF, Palacz, M, Prochniak, L, Pullia, A, Quintana, B, Rampazzo, G, Recchia, F, Redon, N, Reiter, P, Rosso, D, Rusek, K, Sahin, E, Salsac, M-D, Soderstrom, P-A, Stefan, I, Stezowski, O, Styczen, J, Theisen, Ch, Toniolo, N, Ur, CA, Wadsworth, R, Wasilewska, B, Wiens, A, Wood, JL, Wrzosek-Lipska, K, and Zieblinski, M

Published
2018

162. Postoperative pain management in children: Guidance from the pain committee of the European Society for Paediatric Anaesthesiology (ESPA Pain Management Ladder Initiative)

Author

Vittinghoff M, Lönnqvist PA, Mossetti V, Heschl S, Simic D, Colovic V, Dmytriiev D, Hölzle M, Zielinska M, Kubica-Cielinska A, Lorraine-Lichtenstein E, Budic I, Karisik M, De José María B, Smedile F, and Morton NS

Subjects
opioids, nonopioid drugs, Pediatrics, perioperative pain, analgesics, regional anesthesia
Abstract

The main remit of the European Society for Paediatric Anaesthesiology (ESPA) Pain Committee is to improve the quality of pain management in children. The ESPA Pain Management Ladder is a clinical practice advisory based upon expert consensus to help to ensure a basic standard of perioperative pain management for all children. Further steps are suggested to improve pain management once a basic standard has been achieved. The guidance is grouped by the type of surgical procedure and layered to suggest basic, intermediate, and advanced pain management methods. The committee members are aware that there are marked differences in financial and personal resources in different institutions and countries and also considerable variations in the availability of analgesic drugs across Europe. We recommend that the guidance should be used as a framework to guide best practice.

Published
2018

163. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni-78 Region : A Hint from Lifetime Measurements

Author

Delafosse, C., Verney, D., Marevic, P., Gottardo, A., Michelagnoli, C., Lemasson, A., Goasduff, A., Ljungvall, J., Clement, E., Korichi, A., De Angelis, G., Andreoiu, C., Babo, M., Boso, A., Didierjean, F., Dudouet, J., Franchoo, S., Gadea, A., Georgiev, G., Ibrahim, F., Jacquot, B., Konstantinopoulos, T., Lenzi, S. M., Maquart, G., Matea, I, Mengoni, D., Napoli, D. R., Niksic, T., Olivier, L., Perez-Vidal, R. M., Portail, C., Recchia, F., Redon, N., Siciliano, M., Stefan, I, Stezowski, O., Vretenar, D., Zielinska, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Charles, L., Ciemala, M., Collado, J., Cullen, D. M., Desesquelles, P., de France, G., Domingo-Pardo, C., Eberth, J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Lefevre, A., Legruel, F., Menegazzo, R., Million, B., Nyberg, Johan, Quintana, B., Ralet, D., Reiter, P., Saillant, F., Sanchis, E., Theisen, Ch, and Dobon, J. J. Valiente

Subjects
Subatomär fysik, Subatomic Physics, pseudospin symmetry, nuclear energy density functionals
Abstract

Lifetime measurements of excited states of the light N = 52 isotones Kr-88, Se-86, and Ge-84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2; 2(+)-> 0(+)) and B(E2; 4(+)-> 2(+)) were obtained for the first time for the hard-to-reach 84Ge. While the B(E2; 2(+)-> 0(+) ) values of Kr-88, Se-86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g(7/2), 1h(11/2)) space of an inert Ni-78 core, the value obtained for Ge-84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N less than or similar to 49, extend beyond N = 50. The onset of collectivity at Z = 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector rho field in shell-structure evolution.

Published
2018

164. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni 78 Region:A Hint from Lifetime Measurements

Author

Delafosse, C., Verney, D., Marević, P., Gottardo, A., Michelagnoli, C., Lemasson, A., Goasduff, A., Ljungvall, J., Clément, E., Korichi, A., De Angelis, G., Andreoiu, C., Babo, M., Boso, A., Didierjean, F., Dudouet, J., Franchoo, S., Gadea, A., Georgiev, G., Ibrahim, F., Jacquot, B., Konstantinopoulos, T., Lenzi, S. M., Maquart, G., Matea, I., Mengoni, D., Napoli, D. R., Nikšić, T., Olivier, L., Pérez-Vidal, R. M., Portail, C., Recchia, F., Redon, N., Siciliano, M., Stefan, I., Stezowski, O., Vretenar, D., Zielinska, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Charles, L., Ciemala, M., Collado, J., Cullen, D. M., Désesquelles, P., and De France, G.

Abstract

Lifetime measurements of excited states of the light N=52 isotones Kr88, Se86, and Ge84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2+→0+) and B(E2;4+→2+) were obtained for the first time for the hard-to-reach Ge84. While the B(E2;2+→0+) values of Kr88, Se86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g7/2, 1h11/2) space of an inert Ni78 core, the value obtained for Ge84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N''49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.

Published
2018

165. Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr

Author

Wimmer, K., Korten, W., Arici, T., Doornenbal, P., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., De Angelis, G., De France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Jenkins, D., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Obertelli, A., Lubos, D., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Wadsworth, R., and Zielinska, M.

Abstract

Physics letters / B B 785, 441 - 446 (2018). doi:10.1016/j.physletb.2018.07.067, Published by North-Holland Publ., Amsterdam

Published
2018
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166. First measurement of the g factor in the chiral band: The case of the Cs-128 Isomeric state

Author

Grodner, E., Srebrny, J., Droste, Ch., Prochniak, L., Rohozinski, S. G., Kowalczyk, M., Ionescu-Bujor, M., Ur, C. A., Starosta, K., Ahn, T., Kisielinski, M., Marchlewski, T., Aydın, S., Recchia, F., Georgiev, G., Lozeva, R., Fiori, E., Zielinska, M., Chen, Q. B., Zhang, S. Q., Yu, L. F., Zhao, P. W., Meng, J., Sabire Yazıcı Fen Edebiyat Fakültesi, Chen, Qibo -- 0000-0001-5159-4468, Meng, Jie -- 0000-0002-0977-5318, Georgiev, Georgi -- 0000-0003-1467-1764, Zhang, Shuangquan -- 0000-0002-9590-1818, Zhao, Pengwei -- 0000-0001-8243-2381, Ahn, Tan -- 0000-0003-2249-7399, Prochniak, Leszek -- 0000-0002-6577-6438, and Lozeva, Radomira -- 0000-0002-0024-7068

Abstract

WOS: 000423131200005, PubMed: 29376727, The g factor of the 56 ns half-life isomeric state in Cs-128 has been measured using the time-differential perturbed angular distribution method. This state is the bandhead of the positive-parity chiral rotational band, which emerges when an unpaired proton, an unpaired neutron hole, and an even-even core are coupled such that their angular momentum vectors are aplanar (chiral configuration). g-factor measurements can give important information on the relative orientation of the three angular momentum vectors. The measured g factor g = +0.59(1) shows that there is an important contribution of the core rotation in the total angular momentum of the isomeric state. Moreover, a quantitative theoretical analysis supports the conclusion that the three angular momentum vectors lie almost in one plane, which suggests that the chiral configuration in Cs-128 demonstrated in previous works by characteristic patterns of electromagnetic transitions appears only above some value of the total nuclear spin., Polish National Science Centre (NCN) [2013/10/M/ST2/00427]; Polish-French Collaboration [COPIN-IN2P3 (06-121)]; Chinese Major State 973 Program [2013CB834400]; National Natural Science Foundation of China [11335002, 11375015, 11461141002, 11621131001]; China Postdoctoral Science Foundation [2015M580007, 2016T90007]; U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]; U.S. National Science Foundation [1713857], The authors wish to thank the ORSAY Tandem team for providing an excellent and stable beam. This project was supported in part by Polish National Science Centre (NCN) Grant No. 2013/10/M/ST2/00427. This work was partially supported by the Polish-French Collaboration No. COPIN-IN2P3 (06-121). This work was partly supported by the Chinese Major State 973 Program No. 2013CB834400, the National Natural Science Foundation of China (Grants No. 11335002, No. 11375015, No. 11461141002, and No. 11621131001), and the China Postdoctoral Science Foundation under Grants No. 2015M580007 and No. 2016T90007. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (P.W.Z.). This work was partly supported by the U.S. National Science Foundation, Grant No. 1713857.

Published
2018

168. Discovery of 68Br in secondary reactions of radioactive beams

Author

Wimmer, K., primary, Doornenbal, P., additional, Korten, W., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Arici, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D.T., additional, Gerl, J., additional, Gernhäuser, R., additional, Jenkins, D.G., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Obertelli, A., additional, Lubos, D., additional, Rubio, B., additional, Sahin, E., additional, Saito, T.Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Wadsworth, R., additional, and Zielinska, M., additional

Published
2019
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170. Triaxiality near the 110Ru ground state from Coulomb excitation

Author

Doherty, D.T., Allmond, J.M., Janssens, R.V.F., Korten, W., Zhu, S., Zielińska, M., Radford, D.C., Ayangeakaa, A.D., Bucher, B., Batchelder, J.C., Beausang, C.W., Campbell, C., Carpenter, M.P., Cline, D., Crawford, H.L., David, H.M., Delaroche, J.P., Dickerson, C., Fallon, P., Galindo-Uribarri, A., Kondev, F.G., Harker, J.L., Hayes, A.B., Hendricks, M., Humby, P., Girod, M., Gross, C.J., Klintefjord, M., Kolos, K., Lane, G.J., Lauritsen, T., Libert, J., Macchiavelli, A.O., Napiorkowski, P.J., Padilla-Rodal, E., Pardo, R.C., Reviol, W., Sarantites, D.G., Savard, G., Seweryniak, D., Srebrny, J., Varner, R., Vondrasek, R., Wiens, A., Wilson, E., Wood, J.L., and Wu, C.Y.

Published
2017
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171. Quadrupole collectivity in Ca-42 from low-energy Coulomb excitation with AGATA

Author

Hadynska-Klek, K., Napiorkowski, P. J., Zielinska, M., Srebrny, J., Maj, A., Azaiez, F., Dobon, J. J. Valiente, Kicinska-Habior, M., Nowacki, F., Naidja, H., Bounthong, B., Rodriguez, T. R., de Angelis, G., Abraham, T., Kumar, G. Anil, Bazzacco, D., Bellato, M., Bortolato, D., Bednarczyk, P., Benzoni, G., Berti, L., Birkenbach, B., Bruyneel, B., Brambilla, S., Camera, F., Chavas, J., Cederwall, B., Charles, L., Ciemala, M., Cocconi, P., Coleman-Smith, P., Colombo, A., Corsi, A., Crespi, F. C. L., Cullen, D. M., Czermak, A., Desesquelles, P., Doherty, D. T., Dulny, B., Eberth, J., Farnea, E., Fornal, B., Franchoo, S., Gadea, A., Giaz, A., Gottardo, A., Grave, X., Grebosz, J., Gorgen, A., Gulmini, M., Habermann, T., Hess, H., Isocrate, R., Iwanicki, J., Jaworski, G., Judson, D. S., Jungclaus, A., Karkour, N., Kmiecik, M., Karpinski, D., Kisielinski, M., Kondratyev, N., Korichi, A., Komorowska, M., Kowalczyk, M., Korten, W., Krzysiek, M., Lehaut, G., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lunardi, S., Maron, G., Mazurek, K., Menegazzo, R., Mengoni, D., Merchan, E., Meczynski, W., Michelagnoli, C., Million, B., Myalski, S., Napoli, D. R., Niikura, M., Obertelli, A., Ozmen, S. F., Palacz, M., Prochniak, L., Pullia, A., Quintana, B., Rampazzo, G., Recchia, F., Redon, N., Reiter, P., Rosso, D., Rusek, K., Sahin, E., Salsac, M-D, Söderström, Pär-Anders, Stefan, I., Stezowski, O., Styczen, J., Theisen, Ch., Toniolo, N., Ur, C. A., Wadsworth, R., Wasilewska, B., Wiens, A., Wood, J. L., Wrzosek-Lipska, K., Zieblinski, M., Hadynska-Klek, K., Napiorkowski, P. J., Zielinska, M., Srebrny, J., Maj, A., Azaiez, F., Dobon, J. J. Valiente, Kicinska-Habior, M., Nowacki, F., Naidja, H., Bounthong, B., Rodriguez, T. R., de Angelis, G., Abraham, T., Kumar, G. Anil, Bazzacco, D., Bellato, M., Bortolato, D., Bednarczyk, P., Benzoni, G., Berti, L., Birkenbach, B., Bruyneel, B., Brambilla, S., Camera, F., Chavas, J., Cederwall, B., Charles, L., Ciemala, M., Cocconi, P., Coleman-Smith, P., Colombo, A., Corsi, A., Crespi, F. C. L., Cullen, D. M., Czermak, A., Desesquelles, P., Doherty, D. T., Dulny, B., Eberth, J., Farnea, E., Fornal, B., Franchoo, S., Gadea, A., Giaz, A., Gottardo, A., Grave, X., Grebosz, J., Gorgen, A., Gulmini, M., Habermann, T., Hess, H., Isocrate, R., Iwanicki, J., Jaworski, G., Judson, D. S., Jungclaus, A., Karkour, N., Kmiecik, M., Karpinski, D., Kisielinski, M., Kondratyev, N., Korichi, A., Komorowska, M., Kowalczyk, M., Korten, W., Krzysiek, M., Lehaut, G., Leoni, S., Ljungvall, J., Lopez-Martens, A., Lunardi, S., Maron, G., Mazurek, K., Menegazzo, R., Mengoni, D., Merchan, E., Meczynski, W., Michelagnoli, C., Million, B., Myalski, S., Napoli, D. R., Niikura, M., Obertelli, A., Ozmen, S. F., Palacz, M., Prochniak, L., Pullia, A., Quintana, B., Rampazzo, G., Recchia, F., Redon, N., Reiter, P., Rosso, D., Rusek, K., Sahin, E., Salsac, M-D, Söderström, Pär-Anders, Stefan, I., Stezowski, O., Styczen, J., Theisen, Ch., Toniolo, N., Ur, C. A., Wadsworth, R., Wasilewska, B., Wiens, A., Wood, J. L., Wrzosek-Lipska, K., and Zieblinski, M.

Abstract

ACoulomb-excitation experiment to study electromagnetic properties of Ca-42 was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. gamma rays from excited states in Ca-42 were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in Ca-42, including the diagonal E2 matrix elements of 2(1)(+) and 2(2)(+) states, were determined using the least-squares code GOSIA. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 0(1),(+)(2) and 2(1,2)(+) states, as well as triaxiality for 0(1,2)(+) states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca-42. The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in Ca-42.

Published
2018
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172. COULOMB EXCITATION OF Xe-142

Author

Henrich, C., Kroell, Th., Arnswald, K., Berger, C., Berner, C., Berry, T., Bildstein, V., Cederkall, J., Cox, D., de Angelis, G., de Witte, H., Martinez, G. Fernandez, Gaffney, L., Georgiev, G., Ilieva, S., Sison, A. Illana, Lozeva, R., Matejska-Minda, M., Napiorkowski, P. J., Ojala, J., Pakarinen, J., Rainovski, G., Ramdhane, M., Reiter, P., Rhee, H-B, Rosiak, D., Seidlitz, M., Siebeck, B., Simpson, G., Snall, J., Vaquero Soto, V., Thuerauf, M., von Schmid, M., Warr, N., Werner, L., Zielinska, M., Henrich, C., Kroell, Th., Arnswald, K., Berger, C., Berner, C., Berry, T., Bildstein, V., Cederkall, J., Cox, D., de Angelis, G., de Witte, H., Martinez, G. Fernandez, Gaffney, L., Georgiev, G., Ilieva, S., Sison, A. Illana, Lozeva, R., Matejska-Minda, M., Napiorkowski, P. J., Ojala, J., Pakarinen, J., Rainovski, G., Ramdhane, M., Reiter, P., Rhee, H-B, Rosiak, D., Seidlitz, M., Siebeck, B., Simpson, G., Snall, J., Vaquero Soto, V., Thuerauf, M., von Schmid, M., Warr, N., Werner, L., and Zielinska, M.

Abstract

The even-even nucleus Xe-142 lies north-east of the doubly magic Sn-132 on the neutron-rich side of the nuclear chart. In order to gain further information on the octupole collectivity and the evolution of quadrupole collectivity in this region, a safe Coulomb excitation experiment was carried out at the new HIE-ISOLDE facility (CERN) at the end of 2016. As the gamma-ray detector the Miniball spectrometer was used. Beam and target nuclei were detected using C-REX, i.e. an array of segmented Si detectors, covering forward as well as backward angles in the laboratory frame.

Published
2018

173. 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

174. Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, Wilton, De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadyńska-Klęk, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zsolt, Porta, A., Regan, Patrick, Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, Robert, Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

Fast-neutron-induced fission of 238U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency γ-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via γ−γ coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fast-neutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.

Published
2017

175. $^{96}_{36}$Kr$_{60}$–Low-Z Boundary of the Island of Deformation at N =60

Author

Dudouet, J., Lemasson, A., Duchêne, G., Rejmund, M., Clément, E., Michelagnoli, C., Didierjean, F., Korichi, A., Maquart, G., Stezowski, O., Lizarazo, C., Pérez-Vidal, R.M., Andreoiu, C., Angelis, G. De, Astier, A., Delafosse, C., Deloncle, I., Dombradi, Z., De France, G., Gadea, A., Gottardo, A., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Blanc, F. Le, Lenzi, S.M., Li, G., Lozeva, Radomira, Million, B., Napoli, D.R., Navin, A., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., Collado, J., Cullen, D.M., Désesquelles, P., Pardo, C. Domingo, González, V., Harkness-Brennan, L., Hess, H., Judson, D.S., Karolak, M., Korten, W., Labiche, M., Ljungvall, J., Menegazzo, R., Mengoni, D., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Theisen, Ch., Valiente-Dobon, J.J., Zielinska, M., 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), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), 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 d'Orsay (IPNO), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, The support from the EuropeanUnion Seventh Framework Programme through ENSAR, Contract No. 262010., AGATA, 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)-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)-Université de Strasbourg (UNISTRA)-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), and Université de Strasbourg (UNISTRA)-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

Expérience GANIL/AGATA/VAMOS++ Spectrometer; International audience; Prompt γ-ray spectroscopy of the neutron-rich $^{96}$Kr, produced in transfer- and fusion-induced fissionreactions, has been performed using the combination of the Advanced Gamma Tracking Array and theVAMOS++ spectrometer. A second excited state, assigned to $J^π$ = $4^+$, is observed for the first time, anda previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratioR4/2 = E($4^+$)/E($2^+$) = 2.12(1) indicates that this nucleus does not show a well-developed collectivitycontrary to that seen in heavier N = 60 isotones. This new measurement highlights an abrupt transition ofthe degree of collectivity as a function of the proton number at Z = 36, of similar amplitude to thatobserved at N = 60 at higher Z values. A possible reason for this abrupt transition could be related to theinsufficient proton excitations in the g9/2, d5/2, and s1/2 orbitals to generate strong quadrupole correlationsor to the coexistence of competing different shapes. An unexpected continuous decrease of R4/2 as a function of the neutron number up to N = 60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N = 60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N = 60 and Z = 36.

Published
2017

176. Shape coexistence in $^{96,98}$Sr

Author

Clément, E., Zielinska, M., Görgen, A., Korten, W., Péru, S., Goutte, H., Hilaire, S., Doherty, D.T., 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), 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, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IS451 collaboration, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lion, Michel

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

International audience; The structure of neutron-rich 96,98Sr isotopes was investigated by lowenergyCoulomb excitation of radioactive beams at the REX-ISOLDE facility.Reduced transition probabilities and spectroscopic quadrupole moments wereextracted from the differential Coulomb excitation cross sections. These results allowfor the first time to draw definite conclusions about the shape coexistence of highlydeformed prolate and spherical configurations. In particular, a very small mixingbetween the coexisting states is observed, contrary to other mass regions wherestrong mixing is the rule. The experimental data suggest a significant contribution ofthe triaxial degree of freedom in the ground state of both isotopes. In addition,experimental information on low-lying states in 98Rb has been obtained.

Published
2017

177. Measurement of lifetimes in Fe-62,Fe-64, Co-61,Co-63, and Mn-59

Author

Klintefjord, M., Ljungvall, J., Gorgen, A., Lenzi, S. M., Garrote, F. L. Bello, Blazhev, A., Clement, E., de France, G., Delaroche, J. -P, Desesquelles, P., Dewald, A., Doherty, D. T., Fransen, C., Gengelbach, Aila, Georgiev, G., Girod, M., Goasduff, A., Gottardo, A., Hadynska-Klek, K., Jacquot, B., Konstantinopoulos, T., Korichi, A., Lemasson, A., Libert, J., Lopez-Martens, A., Michelagnoli, C., Navin, A., Nyberg, Johan, Perez-Vidal, R. M., Roccia, S., Sahin, E., Stefan, I., Stuchbery, A. E., Zielinska, M., Barrientos, D., Birkenbach, B., Boston, A., Charles, L., Ciemala, M., Dudouet, J., Eberth, J., Gadea, A., Gonzalez, V., Harkness-Brennan, L., Hess, H., Jungclaus, A., Korten, W., Menegazzo, R., Mengoni, D., Million, B., Pullia, A., Ralet, D., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, Ch., and Dobon, J. J. Valiente

Subjects
Atom and Molecular Physics and Optics, Atom- och molekylfysik och optik
Abstract

Lifetimes of the 4(1)(+) states in Fe-62,Fe-64 and the 11/2(1)(-) states in Co-61,Co-63 and Mn-59 were measured at the Grand Accelerateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U-238 beam impinging on a Ni-64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. The data show an increase of collectivity in the iron isotopes approaching N = 40. The reduction of the subshell gap between the nu 2p(1/2) and nu 1g(9/2) orbitals leads to an increased population of the quasi-SU(3) pair (nu 1g(9/2), nu 2d(5/2)), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes withN < 40 for which the neutron subshell gap is larger due to the repulsive monopole component of the tensor nucleon-nucleon interaction. The extracted experimental B(E2) values are compared with large-scale shell-model calculations and with beyond-mean-field calculations with the Gogny D1S interaction. A good agreement between calculations and experimental values is found, and the results demonstrate in particular the spectroscopic quality of the Lenzi, Nowacki, Poves, and Sieja (LNPS) shell-model interaction.

Published
2017

178. 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

179. Cardiopoietic cell therapy for advanced ischemic heart failure : results at 39 weeks of the prospective, randomized, double blind, sham-controlled CHART-1 clinical trial

Author

Bartunek, Jozef, Terzic, Andre, Davison, Beth A, Filippatos, Gerasimos S, Radovanovic, Slavica, Beleslin, Branko, Merkely, Bela, Musialek, Piotr, Wojakowski, Wojciech, Andreka, Peter, Horvath, Ivan G, Katz, Amos, Dolatabadi, Dariouch, El Nakadi, Badih, Arandjelovic, Aleksandra, Edes, Istvan, Seferovic, Petar M, Obradovic, Slobodan, Vanderheyden, Marc, Jagic, Nikola, Petrov, Ivo, Atar, Shaul, Halabi, Majdi, Gelev, Valeri L, Shochat, Michael K, Kasprzak, Jaroslaw D, Sanz Ruiz, Ricardo, Heyndrickx, Guy R, Nyolczas, Noémi, Legrand, Victor, Guédès, Antoine, Heyse, Alex, Moccetti, Tiziano, Fernandez Aviles, Francisco, Jimenez Quevedo, Pilar, Bayes Genis, Antoni, Hernandez Garcia, Jose Maria, Ribichini, Flavio, Gruchala, Marcin, Waldman, Scott A, Teerlink, John R, Gersh, Bernard J, Povsic, Thomas J, Henry, Timothy D, Metra, Marco, Hajjar, Roger J, Tendera, Michal, Behfar, Atta, Alexandre, Bertrand, Seron, Aymeric, Stough, Wendy Gattis, Sherman, Warren, Cotter, Gad, Wijns, W. i. l. l. i. a. m. Collaborators Clinical investigators, Dens, sites Belgium: Ziekenhuis Oost Limburg: J., Dupont, M., Mullens, W., Janssens, M., Dolatabadi, Hoˆpital Civil de Charleroi: D., De Bruyne, Y., Lalmand, J., Dubois, P., El Nakadi, B., Aminian, A., De Vuyst, E., Gurnet, P., Gujic, M., Blankoff, I., Guedes, CHU Mont Godinne UCL: A., Gabriel, L., Seldrum, S., Doyen, C., Andre´, M., Heyse, AZ Glorieux: A., Van Durme, F., Verschuere, J., Legrand, Domaine Universitaire du Sart Tilman: V., Gach, O., D’Orio, V., Davin, L., Lancellotti, P., Baudoux, E., Ancion, A., Dulgheru, R., Vanderheyden, OLV Ziekenhuis Aalst – Cardiologie: M., Bartunek, J., Wijns, W., Verstreken, S., Penicka, . M., Gelev, P. Meeus Bulgaria: Tokuda Hospital Sofia: V., Zheleva Kichukova, I., Parapunova, R., Melamed, R., Sardovski, S., Radev, O., Yordanov, A., Radinov, A., Nenov, D., Amine, I., Petrov, City Hospital Clinic Cardiology Center: I., Kichukov, K., Nikitasov, L., Stankov, Z., Stoyanov, H., Tasheva Dimitrova, I., Angelova, M., Dimitrov, E., Minchev, M., Garvanski, I., Botev, C., Polomski, P., Alexandrovska University Hospital, Vassilev, Sofia: D., Karamfiloff, K., Tarnovska Kadreva, R., Vladimirova, L., Dimitrov, G., Hadzhiev, E., Tzvetkova, G., Andreka, . M. Atanasova Hungary: Gottsegen Gyo¨ rgy Orszagos Kardiologiai Inte´zet: P., Fontos, G., Fabian, J., Csepregi, A., Uzonyi, G., Gelei, A., Edes, Debreceni Egyetem Orvos e´s Ege´szse´gtudomanyi Centrum Altalanos Orvostudomanyi Kar Kardiologia Inte´zet: I., Balogh, L., Vajda, G., Darago, A., Gergely, S., Fulop, T., Jenei, C., Horvath, Pe´csi Tudomanyegyetem Klinikai Ko¨zpont Szıvgyogyaszati Klinika: I., Magyari, B., Nagy, A., Cziraki, A., Faludi, R., Kittka, B., Alizadeh, H., Merkely, Semmelweis Egyetem Varosmajori Szıv e´s Ergyogyaszati Klinika: B., Geller, L., Farkas, P., Szombath, G., Foldes, G., Skopal, J., Kovacs, A., Kosztin, A., Gara, E., Sydo, N., Nyolczas, MH Ege´szse´gu¨gyi Ko¨zpont Kardiologiai Osztaly: N., Kerecsen, G., Korda, A., Kiss, . M., Borsanyi, T., Polgar, B., Muk, B., Sharif, Z. Bari Ireland: HRB Clinical Research Facility: F., Atar, Y. M. Smyth Israel:Western Galilee Hospital: S., Shturman, A., Akria, L., Kilimnik, M., Brezins, M., Halabi, Ziv Medical Center: M., Dally, N., Goldberg, A., Aehab, K., Rosenfeld, I., Levinas, T., Saleem, D., Katz, Barzilai Medical Center: A., Plaev, T., Drogenikov, T., Nemetz, A., Barshay, Y., Jafari, J., Orlov, I., Nazareth Hospital EMMS: M. Omory, N. Kogan Nielsen, Shochat, Hillel Yaffe Medical Center: M., Shotan, A., Frimerman, A., Meisel, S., Asif, A., Sofer, O., Blondheim, D. S., Vazan, A., Metra, L. Arobov Italy: A. O. Spedali Civili di Brescia: M., Bonadei, I., Inama, L., Chiari, E., Lombardi, C., Magatelli, M., Russo, D., Lazzarini, V., Carubelli, V., Vassanelli, AOUI Verona – Borgo Trento Hospital: C., Ribichini, Flavio Luciano, Bergamini, C., Krampera, Mauro, Cicoria, M. A., Zanolla, L., Dalla Mura, D., Gambaro, A., Rossi, A., Pesarini Poland: Jagiellonian University Department of Cardiac, G., Musialek, Vascular Diseases at John Paul II Hospital in Krakow: P., Mazurek, A., Drabik, L., Ka˛dzielski, A., Walter, Z., Dzieciuch Rojek, M., Rubis, P., Plazak, . W., Tekieli, L., Podolec, J., Orczyk, W., Sutor, U., Zmudka, K., Olszowska, M., Podolec, P., Gruchala, Uniwersyteckie Centrum Kliniczne: M., Ciecwierz, D., Mielczarek, M., Burakowski, S., Chmielecki, M., Zielinska, M., Frankiewicz, A., Wdowczyk, J., Stopczynska, I., Bellwon, J., Mosakowska, K., Nadolna, R., Wroblewska, J., Rozmyslowska, M., Rynkiewicz, M., Marciniak, I., Raczak, G., Tarnawska, M., Taszner, M., Kasprzak, Bieganski Hospital: J., Plewka, M., Fiutowska, D., Rechcinski, T., Lipiec, P., Sobczak, M., Weijner Mik, P., Wraga, M., Krecki, R., Markiewicz, M., Haval Qawoq, D., Wojakowski, Gornosla˛skie Centrum Medyczne Sla˛skie j. Akademii Medycznej: W., Ciosek, J., Dworowy, S., Gaszewska Zurek, E., Ochala, A., Cybulski, W., Jadczyk, T., Wanha, W., Parma, Z., Kozlowski, M., Dzierzak, M., Markiewicz Serbia: Clinical Hospital Center Zvezdara, M., Arandjelovic, Cardiology Clinic: A., Sekularac, N., Boljevic, D., Bogdanovic, A., Zivkovic, S., Cvetinovic, N., Loncar, G., Clinical Centre of Serbia, Beleslin, Cardiology Clinic: B., Nedeljkovic, M., Trifunovic, D., Giga, V., Banovic, M., Nedeljkovic, I., Stepanovic, J., Vukcevic, V., Djordjevic Dikic, A., Dobric, M., Obrenovic Kircanski, B., Seferovic, Cardiology Clinic: P., Orlic, D., Tesic, M., Petrovic, O., Milinkovic, I., Simeunovic, D., Jagic, Clinical Center of Kragujevac: N., Tasic, M., Nikolic, D., Miloradovic, V., Djurdjevic, P., Sreckovic, M., Zornic, N., Clinical Hospital Center Bezanijska Kosa, Radovanovic, Cardiology Department: S., Saric, J., Hinic, S., Djokovic, A., Ðordevic, S., Bisenic, V., Markovic, O., Stamenkovic, S., Malenkovic, V., Tresnjak, J., Misic, G., Cotra, D., Tomovic, L., Vuckovic, V., Clinic of Emergency Internal Medicine, Obradovic, Military Medical Academy: S., Jovic, Z., Vukotic, S., Markovic, D., Djenic, N., Ristic Andjelkov, A., Bayes Genis, D. Ljubinka Spain: Hospital Universitario Germans Trias I. Pujol: A., Rodriguez Leor, O., Labata, C., Vallejo, N., Ferrer, E., Batlle, M., Fernandez Aviles, Hospital General Universitario Gregorio Mara~non: F., Sanz Ruiz, R., Casado, A., Loughlin, G., Zatarain, E., Anguita, J., Ferna ndez Santos, M. E., Pascual, C., Bermejo, J., Hernandez Garcia, Hospital Clinico Universitario Virgen de la Victoria: J. M., Jimenez Navarro, M., Dominguez, A., Carrasco, F., Mu~noz, A., Garcia Pinilla, J. M., Ruiz, J., Queipo de Llano, M. P., Hernandez, A., Fernandez, A., Jimenez Quevedo, Hospital Clinico San Carlos: P., Guerra, R., Biagioni, C., Gonzalez, R. A., Gomez deDiego, J. J., Mansson Broberg, L. Perez de Isla Sweden: Karolinska University Hospital: A., Sylve´n, C., Leblanc, K., Winter, R., Blomberg, P., Gunyeli, E., Ruck, A., Silva, C., Fo¨rstedt Switzerland: CardioCentro Ticino, J., Moccetti, Switzerland: T., Rossi, M., Pasotti, E., Petrova, I., Crljenica, C., Monti, C., Murzilli, R., Su¨rder, D., Moccetti, M., Turchetto, L., Locicero, V., Chiumiento, L., Maspoli, S., Mombelli, M., Anesini, A., Biggiogero, M., Ponti, G., Camporini, C., Polledri, S., Hill, G. Dolci United Kingdom: Kings College Hospital: J., Plymen, C., Amin Youssef, G., Mcdonagh, T., Drasar, E., Mijovic, A., Jouhra, F., Mcloman, D., Dworakowski, R., Webb, I., Byrne, J., and Potter, V.

Subjects
0301 basic medicine, Male, Cardiopoiesis, Cardiovascular disease, Disease severity, Marker, Precision medicine, Regenerative medicine, Stem cell, Target population, Adult, Aged, Double-Blind Method, Female, Heart Failure, Humans, Mesenchymal Stem Cell Transplantation, Middle Aged, Myocardial Ischemia, Prospective Studies, Treatment Outcome, Young Adult, Cardiology and Cardiovascular Medicine, Cell- and Tissue-Based Therapy, mesenchymal stem-cells, 030204 cardiovascular system & hematology, Cardiorespiratory Medicine and Haematology, outcomes, Fast-Track Clinical Research, Sudden cardiac death, 0302 clinical medicine, Ischemia, cardiovascular disease, Clinical endpoint, target population, CHART Program, Ejection fraction, bone-marrow, Heart Failure/Cardiomyopathy, 3. Good health, Cohort, Cardiology, Fast Track, disease severity, delivery, medicine.medical_specialty, precision medicine, Clinical Sciences, regenerative medicine, 03 medical and health sciences, cardiopoiesis, Internal medicine, medicine, Adverse effect, marker, disease, business.industry, medicine.disease, mortality, Confidence interval, Clinical trial, stem cell, Editor's Choice, 030104 developmental biology, predictors, Cardiovascular System & Hematology, Heart failure, business
Abstract

Altres ajuts: This work was supported by Celyad, SA (Mont-Saint-Guibert, Belgium). Celyad has received research grants from the Walloon Region (Belgium, DG06 funding). Cardiopoietic cells, produced through cardiogenic conditioning of patients' mesenchymal stem cells, have shown preliminary efficacy. The Congestive Heart Failure Cardiopoietic Regenerative Therapy (CHART-1) trial aimed to validate cardiopoiesis-based biotherapy in a larger heart failure cohort. This multinational, randomized, double-blind, sham-controlled study was conducted in 39 hospitals. Patients with symptomatic ischaemic heart failure on guideline-directed therapy (n = 484) were screened; n = 348 underwent bone marrow harvest and mesenchymal stem cell expansion. Those achieving > 24 million mesenchymal stem cells (n = 315) were randomized to cardiopoietic cells delivered endomyocardially with a retention-enhanced catheter (n = 157) or sham procedure (n = 158). Procedures were performed as randomized in 271 patients (n = 120 cardiopoietic cells, n = 151 sham). The primary efficacy endpoint was a Finkelstein–Schoenfeld hierarchical composite (all-cause mortality, worsening heart failure, Minnesota Living with Heart Failure Questionnaire score, 6-min walk distance, left ventricular end-systolic volume, and ejection fraction) at 39 weeks. The primary outcome was neutral (Mann–Whitney estimator 0.54, 95% confidence interval [CI] 0.47–0.61 [value > 0.5 favours cell treatment], P = 0.27). Exploratory analyses suggested a benefit of cell treatment on the primary composite in patients with baseline left ventricular end-diastolic volume 200–370 mL (60% of patients) (Mann–Whitney estimator 0.61, 95% CI 0.52–0.70, P = 0.015). No difference was observed in serious adverse events. One (0.9%) cardiopoietic cell patient and 9 (5.4%) sham patients experienced aborted or sudden cardiac death. The primary endpoint was neutral, with safety demonstrated across the cohort. Further evaluation of cardiopoietic cell therapy in patients with elevated end-diastolic volume is warranted.

Published
2017

181. 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

182. STUDY OF OCTUPOLE COLLECTIVITY IN Nd-146 AND Sm-148 USING THE NEW COULOMB EXCITATION SET-UP AT ALTO

Author

Komorowska, M, Zielinska, M, Napiorkowski, P, Doherty, T, Wrzosek-Lipska, Kasia, Butler, PA, Prochniak, L, Korten, W, Briselet, R, De Witte, Hilde, Gaffney, Liam, Georgiev, G, Goasduff, A, Gorgen, A, Gottardo, A, Gregor, ET, Hadynska-Klek, K, Hess, H, Klintefjord, M, Konstantinopoulos, T, Ljungvall, J, Lutter, R, Matea, I, Matuszczak, P, O'Neill, GG, Piatek, W, Reiter, P, Rosiak, D, Scheck, M, Seidlitz, M, Siebeck, B, Thuerauf, M, and Warr, N

Subjects
Nuclear Theory
Abstract

For certain combinations of protons and neutrons in atomic nuclei, a rise of a reflection asymmetry is expected. Experimental E3 strengths, which as a function of the neutron number peak at around N ≈ 88 and N ≈ 134, indicate enhanced octupole correlations as predicted by theory. Low-energy Coulomb excitation is a highly successful method for establishing the evolution of nuclear shapes, through the measurement of cross sections, to populate excited states that can be directly related to the static and dynamic moments of the charge distribution of the nucleus. A Coulomb excitation experiment at the ALTO facility, Orsay was performed recently to study collective properties of 146Nd and 148Sm. In particular, the strengths of the ⟨3−||E3||0+⟩ and ⟨1−||E3||4+⟩ matrix elements will provide a clear distinction between octupole vibration and rigid deformation. ispartof: Acta Physica Polonica B vol:47 issue:3 pages:923-928 status: published

Published
2016

184. Corrigendum to: “Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr” [Nucl. Phys. A 899 (2013) 1–28]

Author

Albers, M., Nomura, K., Warr, N., Blazhev, A., Jolie, J., Mücher, D., Bastin, B., Bauer, C., Bernards, C., Bettermann, L., Bildstein, V., Butterworth, J., Cappellazzo, M., Cederkäll, J., Cline, D., Darby, I., Das Gupta, S., Daugas, J.M., Davinson, T., De Witte, H., Diriken, J., Filipescu, D., Fiori, E., Fransen, C., Gaffney, L.P., Georgiev, G., Gernhäuser, R., Hackstein, M., Heinze, S., Hess, H., Huyse, M., Jenkins, D., Konki, J., Kowalczyk, M., Kröll, T., Krücken, R., Litzinger, J., Lutter, R., Marginean, N., Mihai, C., Moschner, K., Napiorkowski, P., Nara Singh, B.S., Nowak, K., Pakarinen, J., Pfeiffer, M., Radeck, D., Reiter, P., Rigby, S., Robledo, L.M., Rodríguez-Guzmán, R., Rudigier, M., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Thöle, P., Thomas, T., Van de Walle, J., Van Duppen, P., Vermeulen, M., Voulot, D., Wadsworth, R., Wenander, F., Wimmer, K., Zell, K.O., and Zielinska, M.

Published
2016
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185. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Author

Delafosse, C., primary, Verney, D., additional, Marević, P., additional, Gottardo, A., additional, Michelagnoli, C., additional, Lemasson, A., additional, Goasduff, A., additional, Ljungvall, J., additional, Clément, E., additional, Korichi, A., additional, De Angelis, G., additional, Andreoiu, C., additional, Babo, M., additional, Boso, A., additional, Didierjean, F., additional, Dudouet, J., additional, Franchoo, S., additional, Gadea, A., additional, Georgiev, G., additional, Ibrahim, F., additional, Jacquot, B., additional, Konstantinopoulos, T., additional, Lenzi, S. M., additional, Maquart, G., additional, Matea, I., additional, Mengoni, D., additional, Napoli, D. R., additional, Nikšić, T., additional, Olivier, L., additional, Pérez-Vidal, R. M., additional, Portail, C., additional, Recchia, F., additional, Redon, N., additional, Siciliano, M., additional, Stefan, I., additional, Stezowski, O., additional, Vretenar, D., additional, Zielinska, M., additional, Barrientos, D., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Cederwall, B., additional, Charles, L., additional, Ciemala, M., additional, Collado, J., additional, Cullen, D. M., additional, Désesquelles, P., additional, de France, G., additional, Domingo-Pardo, C., additional, Eberth, J., additional, González, V., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Korten, W., additional, Lefevre, A., additional, Legruel, F., additional, Menegazzo, R., additional, Million, B., additional, Nyberg, J., additional, Quintana, B., additional, Ralet, D., additional, Reiter, P., additional, Saillant, F., additional, Sanchis, E., additional, Theisen, Ch., additional, and Valiente Dobon, J. J., additional

Published
2018
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187. Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr

Author

Wimmer, K., primary, Korten, W., additional, Arici, T., additional, Doornenbal, P., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D.T., additional, Gerl, J., additional, Gernhäuser, R., additional, Jenkins, D., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Obertelli, A., additional, Lubos, D., additional, Rubio, B., additional, Sahin, E., additional, Saito, T.Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Wadsworth, R., additional, and Zielinska, M., additional

Published
2018
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190. Studies of fission fragment yields via high-resolution γ-ray spectroscopy

Author

Wilson, J.N., primary, Lebois, M., additional, Qi, L., additional, Amador-Celdran, P, additional, Bleuel, D., additional, Briz, J.A., additional, Carroll, R., additional, Catford, W., additional, Witte, H. De, additional, Doherty, D.T., additional, Eloirdi, R., additional, Georgiev, G., additional, Gottardo, A., additional, Goasduff, A., additional, Hadyñska-Klek, K., additional, Hauschild, K., additional, Hess, H., additional, Ingeberg, V., additional, Konstantinopoulos, T., additional, Ljungvall, J., additional, Lopez-Martens, A., additional, Lorusso, G., additional, Lozeva, R., additional, Lutter, R., additional, Marini, P., additional, Matea, I., additional, Materna, T., additional, Mathieu, L., additional, Oberstedt, A., additional, Oberstedt, S., additional, Panebianco, S., additional, Podolyak, Zs., additional, Porta, A., additional, Regan, P.H., additional, Reiter, P., additional, Rezynkina, K., additional, Rose, S.J., additional, Sahin, E., additional, Seidlitz, M., additional, Serot, O., additional, Shearman, R., additional, Siebeck, B., additional, Siem, S., additional, Smith, A.G., additional, Tveten, G.M., additional, Verney, D., additional, Warr, N., additional, Zeiser, F., additional, and Zielinska, M., additional

Published
2018
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191. 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
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192. Lifetime measurement of neutron-rich even-even molybdenum isotopes

Author

Ralet, D, Bäck, Torbjörn, Cederwall, Bo, Doncel, Maria, Ghazi Moradi, Farnaz, Zielinska, M., et al., Ralet, D, Bäck, Torbjörn, Cederwall, Bo, Doncel, Maria, Ghazi Moradi, Farnaz, Zielinska, M., and et al.

Abstract

Background: In the neutron-rich A approximate to 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method: The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the gamma ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a gamma-ray transition with a known energy. This relativistic Doppler-shift-attenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: tau = 29.7(-9.1)(+11.3) ps for the 4(+) state of Mo-108 and tau = 3.2(-0.7)(+ 0.7) ps for the 6(+) state of Mo-102. Conclusions: The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compare, QC 20170519

Published
2017
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193. Conceptual design of the AGATA 1 π array at GANIL

Author

Clement, E., Michelagnoli, C., de France, G., Li, H. J., Lemasson, A., Dejeon, C. Barthe, Beuzard, M., Bougault, P., Cacitti, J., Foucher, J. -L, Fremont, G., Gangnant, P., Goupil, J., Houarner, C., Jean, M., Lefevre, A., Legeard, L., Legruel, F., Maugeais, C., Menager, L., Menard, N., Munoz, H., Ozille, M., Raine, B., Ropert, J. A., Saillant, F., Spitaels, C., Tripon, M., Vallerand, Ph., Voltolini, G., Korten, W., Salsac, M. -D, Theisen, Ch., Zielinska, M., Joannem, T., Karolak, M., Kebbiri, M., Lotode, A., Touzery, R., Walter, Ch., Korichi, A., Ljungvall, J., Lopez-Martens, A., Ralet, D., Dosme, N., Grave, X., Karkour, N., Lafay, X., Legay, E., Kojouharov, I., Domingo-Pardo, C., Gadea, A., Perez-Vidal, R. M., Civera, J. V., Birkenbach, B., Eberth, J., Hess, H., Lewandowski, L., Reiter, P., Nannini, A., De Angelis, G., Jaworski, G., John, P., Napoli, D. R., Valiente-Dobon, J. J., Barrientos, D., Bortolato, D., Benzoni, G., Bracco, A., Brambilla, S., Camera, F., Crespi, F. C. L., Leoni, S., Million, B., Pullia, A., Wieland, O., Bazzacco, D., Lenzi, S. M., Lunardi, S., Menegazzo, R., Mengoni, D., Recchia, F., Bellato, M., Isocrate, R., Canet, F. J. Egea, Didierjean, F., Duchene, G., Baumann, R., Brucker, M., Dangelser, E., Filliger, M., Friedmann, H., Gaudiot, G., Grapton, J. -N, Kocher, H., Mathieu, C., Sigward, M. -H, Thomas, D., Veeramootoo, S., Dudouet, J., Stezowski, O., Aufranc, C., Aubert, Y., Labiche, M., Simpson, J., Burrows, I., Coleman-Smith, P. J., Grant, A., Lazarus, I. H., Morrall, P. S., Pucknell, V. F. E., Boston, A., Judson, D. S., Lalovic, N., Nyberg, Johan, Collado, J., Gonzalez, V., Kuti, I., Nyako, B. M., Maj, A., Rudigier, M., Clement, E., Michelagnoli, C., de France, G., Li, H. J., Lemasson, A., Dejeon, C. Barthe, Beuzard, M., Bougault, P., Cacitti, J., Foucher, J. -L, Fremont, G., Gangnant, P., Goupil, J., Houarner, C., Jean, M., Lefevre, A., Legeard, L., Legruel, F., Maugeais, C., Menager, L., Menard, N., Munoz, H., Ozille, M., Raine, B., Ropert, J. A., Saillant, F., Spitaels, C., Tripon, M., Vallerand, Ph., Voltolini, G., Korten, W., Salsac, M. -D, Theisen, Ch., Zielinska, M., Joannem, T., Karolak, M., Kebbiri, M., Lotode, A., Touzery, R., Walter, Ch., Korichi, A., Ljungvall, J., Lopez-Martens, A., Ralet, D., Dosme, N., Grave, X., Karkour, N., Lafay, X., Legay, E., Kojouharov, I., Domingo-Pardo, C., Gadea, A., Perez-Vidal, R. M., Civera, J. V., Birkenbach, B., Eberth, J., Hess, H., Lewandowski, L., Reiter, P., Nannini, A., De Angelis, G., Jaworski, G., John, P., Napoli, D. R., Valiente-Dobon, J. J., Barrientos, D., Bortolato, D., Benzoni, G., Bracco, A., Brambilla, S., Camera, F., Crespi, F. C. L., Leoni, S., Million, B., Pullia, A., Wieland, O., Bazzacco, D., Lenzi, S. M., Lunardi, S., Menegazzo, R., Mengoni, D., Recchia, F., Bellato, M., Isocrate, R., Canet, F. J. Egea, Didierjean, F., Duchene, G., Baumann, R., Brucker, M., Dangelser, E., Filliger, M., Friedmann, H., Gaudiot, G., Grapton, J. -N, Kocher, H., Mathieu, C., Sigward, M. -H, Thomas, D., Veeramootoo, S., Dudouet, J., Stezowski, O., Aufranc, C., Aubert, Y., Labiche, M., Simpson, J., Burrows, I., Coleman-Smith, P. J., Grant, A., Lazarus, I. H., Morrall, P. S., Pucknell, V. F. E., Boston, A., Judson, D. S., Lalovic, N., Nyberg, Johan, Collado, J., Gonzalez, V., Kuti, I., Nyako, B. M., Maj, A., and Rudigier, M.

Abstract

The Advanced GAmma Tracking Array (AGATA) has been installed at the GANIL facility, Caen-France. This setup exploits the stable and radioactive heavy-ions beams delivered by the cyclotron accelerator complex of GANIL. Additionally, it benefits from a large palette of ancillary detectors and spectrometers to address in-beam γ-ray spectroscopy of exotic nuclei. The set-up has been designed to couple AGATA with a magnetic spectrometer, charged-particle and neutron detectors, scintillators for the detection of high-energy γ rays and other devices such as a plunger to measure nuclear lifetimes. In this paper, the design and the mechanical characteristics of the set-up are described. Based on simulations, expected performances of the AGATA l π array are presented., Title in WoS: Conceptual design of the AGATA 1 pi array at GANIL

Published
2017
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194. Lifetime measurement of neutron-rich even-even molybdenum isotopes

Author

Ralet, D., Pietri, S., Rodriguez, T., Alaqeel, M., Alexander, T., Alkhomashi, N., Ameil, F., Arici, T., Atac, A., Avigo, R., Back, T., Bazzacco, D., Birkenbach, B., Boutachkov, P., Bruyneel, B., Bruce, A. M., Camera, F., Cederwall, B., Ceruti, S., Clement, E., Cortes, M. L., Curien, D., De Angelis, G., Desesquelles, P., Dewald, M., Didierjean, F., Domingo-Pardo, C., Doncel, M., Duchene, G., Eberth, J., Gadea, A., Gerl, J., Moradi, F. Ghazi, Geissel, H., Goigoux, T., Goel, N., Golubev, P., Gonzalez, V., Gorska, M., Gottardo, A., Gregor, E., Guastalla, G., Givechev, A., Habermann, T., Hackstein, M., Harkness-Brennan, L., Henning, G., Hess, H., Huyuk, T., Jolie, J., Judson, D. S., Jungclaus, A., Knoebel, R., Kojouharov, I., Korichi, A., Korten, W., Kurz, N., Labiche, M., Lalovic, N., Louchart-Henning, C., Mengoni, D., Merchan, E., Million, B., Morales, A. I., Napoli, D., Naqvi, F., Nyberg, J., Pietralla, N., Podolyak, Zs, Pullia, A., Prochazka, A., Quintana, B., Rainovski, G., Reese, M., Recchia, F., Reiter, P., Rudolph, D., Salsac, M. D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Scheidenberger, C., Sengele, L., Singh, B. S. Nara, Singh, P. P., Stahl, C., Stezowski, O., Thoele, P., Dobon, J. J. Valiente, Weick, H., Wendt, A., Wieland, O., Winfield, J. S., Wollersheim, H. J., Zielinska, M., Ralet, D., Pietri, S., Rodriguez, T., Alaqeel, M., Alexander, T., Alkhomashi, N., Ameil, F., Arici, T., Atac, A., Avigo, R., Back, T., Bazzacco, D., Birkenbach, B., Boutachkov, P., Bruyneel, B., Bruce, A. M., Camera, F., Cederwall, B., Ceruti, S., Clement, E., Cortes, M. L., Curien, D., De Angelis, G., Desesquelles, P., Dewald, M., Didierjean, F., Domingo-Pardo, C., Doncel, M., Duchene, G., Eberth, J., Gadea, A., Gerl, J., Moradi, F. Ghazi, Geissel, H., Goigoux, T., Goel, N., Golubev, P., Gonzalez, V., Gorska, M., Gottardo, A., Gregor, E., Guastalla, G., Givechev, A., Habermann, T., Hackstein, M., Harkness-Brennan, L., Henning, G., Hess, H., Huyuk, T., Jolie, J., Judson, D. S., Jungclaus, A., Knoebel, R., Kojouharov, I., Korichi, A., Korten, W., Kurz, N., Labiche, M., Lalovic, N., Louchart-Henning, C., Mengoni, D., Merchan, E., Million, B., Morales, A. I., Napoli, D., Naqvi, F., Nyberg, J., Pietralla, N., Podolyak, Zs, Pullia, A., Prochazka, A., Quintana, B., Rainovski, G., Reese, M., Recchia, F., Reiter, P., Rudolph, D., Salsac, M. D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Scheidenberger, C., Sengele, L., Singh, B. S. Nara, Singh, P. P., Stahl, C., Stezowski, O., Thoele, P., Dobon, J. J. Valiente, Weick, H., Wendt, A., Wieland, O., Winfield, J. S., Wollersheim, H. J., and Zielinska, M.

Abstract

Background: In the neutron-rich A approximate to 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method: The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the gamma ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a gamma-ray transition with a known energy. This relativistic Doppler-shift-attenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: tau = 29.7(-9.1)(+11.3) ps for the 4(+) state of Mo-108 and tau = 3.2(-0.7)(+ 0.7) ps for the 6(+) state of Mo-102. Conclusions: The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compare

Published
2017

195. PRODUCTION AND STUDY OF NEUTRON-RICH NUCLEI USING THE LICORNE DIRECTIONAL NEUTRON SOURCE

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, M., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Z., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., Zielinska, M., Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, M., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Z., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Abstract

We have recently successfully demonstrated a new technique for production and study of many of the most exotic neutron-rich nuclei at moderate spins. LICORNE, a newly developed directional inverse-kinematic fast neutron source at the IPN Orsay, was coupled to the MINIBALL high resolution gamma-ray spectrometer to study nuclei the furthest from stability using the U-238 (n, f) reaction. This reaction and Th-232 (n, f) are the most neutron-rich fission production mechanisms achievable and can be used to simultaneously populate hundreds of neutron-rich nuclei up to spins of approximate to 16 h. High selectivity in the experiment was achieved via triple gamma-ray coincidences and the use of a 400 ns period pulsed neutron beam, a technique which is unavailable to other population mechanisms such as U-235 (n(th), f) and Cf-252(SF). The pulsing allows time correlations to be exploited to separate delayed gamma rays from isomeric states in the hundreds of nuclei produced, which are then used to cleanly select a particular nucleus and its exotic binary partners. In the recent experiment, several physics cases are simultaneously addressed such as shape coexistence, the evolution of shell closures far from stability, and the spectroscopy of nuclei in the r-process path near N = 82. Preliminary physics results on anomalies in the U-238 (n, f) fission yields and the structure of the Te-138 and Sr-100 nuclei will soon be published. A future project, nu-ball, to couple LICORNE with a hybrid escape-suppressed spectrometer to refine further the technique and achieve a large increase in the observational limit is discussed.

Published
2017

196. Kr-96(36)60-Low-Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., Lemasson, A., Duchene, G., Rejmund, M., Clement, E., Michelagnoli, C., Didierjean, F., Korichi, A., Maquart, G., Stezowski, O., Lizarazo, C., Perez-Vidal, R. M., Andreoiu, C., de Angelis, G., Astier, A., Delafosse, C., Deloncle, I., Dombradi, Z., de France, G., Gadea, A., Gottardo, A., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, S. M., Li, G., Lozeva, R., Million, B., Napoli, D. R., Navin, A., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., CoIlado, J., Cullen, D. M., Desesquelles, P., Domingo Pardo, C., Gonzalez, V., Harkness-Brennan, L., Hess, H., Judson, D. S., Karolak, M., Korten, W., Labiche, M., Ljungval, J., Menegazzo, R., Mengoni, D., Pullia, A., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Theisen, Ch., Valiente-Dobon, J. J., Zielinska, M., Dudouet, J., Lemasson, A., Duchene, G., Rejmund, M., Clement, E., Michelagnoli, C., Didierjean, F., Korichi, A., Maquart, G., Stezowski, O., Lizarazo, C., Perez-Vidal, R. M., Andreoiu, C., de Angelis, G., Astier, A., Delafosse, C., Deloncle, I., Dombradi, Z., de France, G., Gadea, A., Gottardo, A., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, S. M., Li, G., Lozeva, R., Million, B., Napoli, D. R., Navin, A., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Verney, D., Barrientos, D., Birkenbach, B., Burrows, I., Charles, L., CoIlado, J., Cullen, D. M., Desesquelles, P., Domingo Pardo, C., Gonzalez, V., Harkness-Brennan, L., Hess, H., Judson, D. S., Karolak, M., Korten, W., Labiche, M., Ljungval, J., Menegazzo, R., Mengoni, D., Pullia, A., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Theisen, Ch., Valiente-Dobon, J. J., and Zielinska, M.

Abstract

Prompt.-ray spectroscopy of the neutron-rich Kr-96, produced in transfer-and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS + +spectrometer. A second excited state, assigned to J pi = 4(+), is observed for the first time, and a previously reported level energy of the first 2+ excited state is confirmed. The measured energy ratio R-4/2 = E(4(+))/E(2(+)) = 2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N = 60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z = 36, of similar amplitude to that observed at N = 60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g(9/2), d(5/2), and s(1/2) orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R-4/2 as a function of the neutron number up to N = 60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N = 60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N = 60 and Z = 36.

Published
2017

197. Conceptual design of the AGATA 1 pi array at GANIL

Author

Clement, E., Michelagnoli, C., de France, G., Li, H. J., Lemasson, A., Dejeon, C. Barthe, Beuzard, M., Bougault, P., Cacitti, J., Foucher, J. -L., Fremont, G., Gangnant, P., Goupil, J., Houarner, C., Jean, M., Lefevre, A., Legeard, L., Legruel, F., Maugeais, C., Menager, L., Menard, N., Munoz, H., Ozille, M., Raine, B., Ropert, J. A., Saillant, F., Spitaels, C., Tripon, M., Vallerand, Ph., Voltolini, G., Korten, W., Salsac, M. -D., Theisen, Ch., Zielinska, M., Joannem, T., Karolak, M., Kebbiri, M., Lotode, A., Touzery, R., Walter, Ch., Korichi, A., Ljungvall, J., Lopez-Martens, A., Ralet, D., Dosme, N., Grave, X., Karkour, N., Lafay, X., Legay, E., Kojouharov, I., Domingo-Pardo, C., Gadea, A., Perez-Vidal, R. M., Civera, J. V., Birkenbach, B., Eberth, J., Hess, H., Lewandowski, L., Reiter, P., Nannini, A., De Angelis, G., Jaworski, G., John, P., Napoli, D. R., Valiente-Dobon, J. J., Barrientos, D., Bortolato, D., Benzoni, G., Bracco, A., Brambilla, S., Camera, F., Crespi, F. C. L., Leoni, S., Million, B., Pullia, A., Wieland, O., Bazzacco, D., Lenzi, S. M., Lunardi, S., Menegazzo, R., Mengoni, D., Recchia, F., Bellato, M., Isocrate, R., Canet, F. J. Egea, Didierjean, F., Duchene, G., Baumann, R., Brucker, M., Dangelser, E., Filliger, M., Friedmann, H., Gaudiot, G., Grapton, J. -N., Kocher, H., Mathieu, C., Sigward, M. -H., Thomas, D., Veeramootoo, S., Dudouet, J., Stezowski, O., Aufranc, C., Aubert, Y., Labiche, M., Simpson, J., Burrows, I., Coleman-Smith, P. J., Grant, A., Lazarus, I. H., Morrall, P. S., Pucknell, V. F. E., Boston, A., Judson, D. S., Lalovic, N., Nyberg, J., Collado, J., Gonzalez, V., Kuti, I., Nyako, B. M., Maj, A., Rudigier, M., Clement, E., Michelagnoli, C., de France, G., Li, H. J., Lemasson, A., Dejeon, C. Barthe, Beuzard, M., Bougault, P., Cacitti, J., Foucher, J. -L., Fremont, G., Gangnant, P., Goupil, J., Houarner, C., Jean, M., Lefevre, A., Legeard, L., Legruel, F., Maugeais, C., Menager, L., Menard, N., Munoz, H., Ozille, M., Raine, B., Ropert, J. A., Saillant, F., Spitaels, C., Tripon, M., Vallerand, Ph., Voltolini, G., Korten, W., Salsac, M. -D., Theisen, Ch., Zielinska, M., Joannem, T., Karolak, M., Kebbiri, M., Lotode, A., Touzery, R., Walter, Ch., Korichi, A., Ljungvall, J., Lopez-Martens, A., Ralet, D., Dosme, N., Grave, X., Karkour, N., Lafay, X., Legay, E., Kojouharov, I., Domingo-Pardo, C., Gadea, A., Perez-Vidal, R. M., Civera, J. V., Birkenbach, B., Eberth, J., Hess, H., Lewandowski, L., Reiter, P., Nannini, A., De Angelis, G., Jaworski, G., John, P., Napoli, D. R., Valiente-Dobon, J. J., Barrientos, D., Bortolato, D., Benzoni, G., Bracco, A., Brambilla, S., Camera, F., Crespi, F. C. L., Leoni, S., Million, B., Pullia, A., Wieland, O., Bazzacco, D., Lenzi, S. M., Lunardi, S., Menegazzo, R., Mengoni, D., Recchia, F., Bellato, M., Isocrate, R., Canet, F. J. Egea, Didierjean, F., Duchene, G., Baumann, R., Brucker, M., Dangelser, E., Filliger, M., Friedmann, H., Gaudiot, G., Grapton, J. -N., Kocher, H., Mathieu, C., Sigward, M. -H., Thomas, D., Veeramootoo, S., Dudouet, J., Stezowski, O., Aufranc, C., Aubert, Y., Labiche, M., Simpson, J., Burrows, I., Coleman-Smith, P. J., Grant, A., Lazarus, I. H., Morrall, P. S., Pucknell, V. F. E., Boston, A., Judson, D. S., Lalovic, N., Nyberg, J., Collado, J., Gonzalez, V., Kuti, I., Nyako, B. M., Maj, A., and Rudigier, M.

Abstract

The Advanced GAmma Tracking Array (AGATA) has been installed at the GANIL facility, Caen-France. This setup exploits the stable and radioactive heavy-ions beams delivered by the cyclotron accelerator complex of GANIL. Additionally, it benefits from a large palette of ancillary detectors and spectrometers to address in-beam gamma-ray spectroscopy of exotic nuclei. The set-up has been designed to couple AGATA with a magnetic spectrometer, charged-particle and neutron detectors, scintillators for the detection of high-energy gamma rays and other devices such as a plunger to measure nuclear lifetimes. In this paper, the design and the mechanical characteristics of the set-up are described. Based on simulations, expected performances of the AGATA l pi array are presented.

Published
2017

198. Anomalies in the Charge Yields of Fission Fragments from the U-238(n, f) Reaction

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zs., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., Zielinska, M., Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zs., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Abstract

Fast-neutron-induced fission of U-238 at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency.-ray spectrometer (MINIBALL) to an inversekinematics neutron source (LICORNE) to extract charge yields of fission fragments via gamma-gamma coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fastneutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.

Published
2017

199. Collectivity in Pb-196,Pb-198 isotopes probed in Coulomb-excitation experiments at REX-ISOLDE

Author

Pakarinen, J., Grahn, T., Gaffney, L. P., Algora, A., Bauer, C., Blazhev, A., Bree, N., Cocolios, T. E., De Witte, H., Diriken, J., Fernier, P., K, Hadynska-Kle K., Herzan, A., Huyse, M., Iwanicki, J., Jakobsson, U., Jenkins, D., Kesteloot, N., Konki, J., Lannoo, B., Papadakis, P., Peura, P., Rahkila, P., Rainovski, G., Rapisarda, E., Reiter, P., Sambi, S., Scheck, M., Seibeck, B., Seidlitz, M., Stora, T., Van Duppen, P., Warr, N., Wenander, F., Vermeulen, M. J., Voulot, D., Wrzosek-Lipska, K., Zielinska, M., Pakarinen, J., Grahn, T., Gaffney, L. P., Algora, A., Bauer, C., Blazhev, A., Bree, N., Cocolios, T. E., De Witte, H., Diriken, J., Fernier, P., K, Hadynska-Kle K., Herzan, A., Huyse, M., Iwanicki, J., Jakobsson, U., Jenkins, D., Kesteloot, N., Konki, J., Lannoo, B., Papadakis, P., Peura, P., Rahkila, P., Rainovski, G., Rapisarda, E., Reiter, P., Sambi, S., Scheck, M., Seibeck, B., Seidlitz, M., Stora, T., Van Duppen, P., Warr, N., Wenander, F., Vermeulen, M. J., Voulot, D., Wrzosek-Lipska, K., and Zielinska, M.

Abstract

The neutron-deficient Pb-196,Pb-198 isotopes have been studied in Coulomb-excitation experiments employing the Miniball gamma-ray spectrometer and radioactive ion beams from the REX-ISOLDE post-accelerator at CERN. The reduced transition probabilities of the first excited 2(+) states in Pb-196 and Pb-198 nuclei have been measured for the first time. Values of B (E2) = 18.2(-4.1)(+4.8) W. u. and B (E2) = 13.1(-3.5)(+4.9) W. u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalised seniority scheme to a region, where intruding structures, associated with different deformed shapes, start to come down in energy and approach the spherical ground state.

Published
2017

200. 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

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