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166 results on '"Timis, C."'

1. Chronology of the three-body dissociation of $^8$He

Author

Laurent, B., Marqués, F. M., Angulo, C., Ashwood, N. I., Borge, M. J. G., Bouchat, V., Catford, W. N., Clarke, N. M., Curtis, N., Freer, M., Hanappe, F., Kinnard, V., Labiche, M., Materna, T., McEwan, P., Nilsson, T., Ninane, A., Normand, G., Orr, N. A., Pain, S. D., Prokhorova, E., Stuttgé, L., and Timis, C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The space and time configurations of the dissociation of $^8$He into $^6$He+$n$+$n$, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the $n$-$n$ and $^6$He-$n$ channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of $^7$He, consistent with neutrons being emitted from a Gaussian volume of $r_{nn}^{\rm{rms}}=7.3\pm0.6$~fm with a $n$-$n$ delay in the sequential channel of $1400\pm400$~fm/$c$, in agreement with the lifetime of $^7$He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the $n$-$n$ volume measured, without any $n$-$n$ delay. The validity of the phenomenological model used is discussed., Comment: Accepted for publication in J. Phys. G, 11 pages, 5 figures

Published
2018
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2. Nuclear structure studies of $^{24}$F

Author

Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fülöp, Zs., Grévy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., De Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., and Vajta, Zs.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The structure of the $^{24}$F nucleus has been studied at GANIL using the $\beta$ decay of $^{24}$O and the in-beam $\gamma$-ray spectroscopy from the fragmentation of projectile nuclei. Combining these complementary experimental techniques, the level scheme of $^{24}$F has been constructed up to 3.6 Mev by means of particle-$\gamma$ and particle-$\gamma\gamma$ coincidence relations. Experimental results are compared to shell-model calculations using the standard USDA and USDB interactions as well as ab-initio valence-space Hamiltonians calculated from the in-medium similarity renormalization group based on chiral two- and three-nucleon forces. Both methods reproduce the measured level spacings well, and this close agreement allows unidentified spins and parities to be consistently assigned., Comment: 5 figures, 2 tables

Published
2015

3. Excited states in the neutron-rich nucleus 25F

Author

Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G. R., Azaiez, F., Dombrádi, Zs., Sorlin, O., Brown, B. A., Belleguic, M., Borcea, C., Bourgeois, C., Dlouhy, Z., Elekes, Z., ülöp, Zs. F, Grévy, S., Guillemaud-Mueller, D., Hagen, G., Hjorth-Jensen, M., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mandal, S., Mayet, P., Mrázek, J., Negoita, F., Penionzhkevich, Yu. -E., Podolyák, Zs., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Timár, J., Timis, C., and Yamamoto, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The structure of the nucleus 25F was investigated through in-beam {\gamma}-ray spectroscopy of the fragmentation of 26Ne and 27,28Na ion beams. Based on the particle-{\gamma} and particle-{\gamma}{\gamma} coincidence data, a level scheme was constructed and compared with shell model and coupled-cluster calculations. Some of the observed states were interpreted as quasi single-particle states built on top of the closed-shell nucleus 24O, while the others were described as states arising from coupling of a single proton to the 2+ core excitation of 24O., Comment: 8 pages, 4 figures and 1 table

Published
2014
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4. The Electromagnetic Calorimeter for the T2K Near Detector ND280

Author

Allan, D., Andreopoulos, C., Angelsen, C., Barker, G. J., Barr, G., Bentham, S., Bertram, I., Boyd, S., Briggs, K., Calland, R. G., Carroll, J., Cartwright, S. L., Carver, A., Chavez, C., Christodoulou, G., Coleman, J., Cooke, P., Davies, G., Densham, C., Di Lodovico, F., Dobson, J., Duboyski, T., Durkin, T., Evans, D. L., Finch, A., Fitton, M., Gannaway, F. C., Grant, A., Grant, N., Grenwood, S., Guzowski, P., Hadley, D., Haigh, M., Harrison, P. F., Hatzikoutelis, A., Haycock, T. D. J., Hyndman, A., Ilic, J., Ives, S., Kaboth, A. C., Kasey, V., Kellet, L., Khaleeq, M., Kogan, G., Kormos, L. L., Lawe, M., Lawson, T. B., Lister, C., Litchfield, R. P., Lockwood, M., Malek, M., Maryon, T., Masliah, P., Mavrokoridis, K., McCauley, N., Mercer, I., Metelko, C., Morgan, B., Morris, J., Muir, A., Murdoch, M., Nicholls, T., Noy, M., O'Keeffe, H. M., Owen, R. A., Payne, D., Pearce, G. F., Perkin, J. D., Poplawska, E., Preece, R., Qian, W., Ratoff, P., Raufer, T., Raymond, M., Reeves, M., Richards, D., Rooney, M., Sacco, R., Sadler, S., Schaack, P., Scott, M., Scully, D. I., Short, S., Siyad, M., Smith, R., Still, B., Sutcliffe, P., Taylor, I. J., Terri, R., Thompson, L. F., Thorley, A., Thorpe, M., Timis, C., Touramanis, C., Uchida, M. A., Uchida, Y., Vacheret, A., VanSchalkwyk, J. F., Veledar, O., Waldron, A. V., Ward, M. A., Ward, G. P., Wark, D., Wascko, M. O., Weber, A., West, N., Whitehead, L. H., Wilkinson, C., and Wilson, J. R.

Subjects
Physics - Instrumentation and Detectors
Abstract

The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and the Super-Kamiokande detector. Special emphasis is placed on measuring the mixing angle theta_13 by observing electron neutrino appearance via the sub-dominant muon neutrino to electron neutrino oscillation, and searching for CP violation in the lepton sector. The experiment includes a sophisticated, off-axis, near detector, the ND280, situated 280 m downstream of the neutrino production target in order to measure the properties of the neutrino beam and to understand better neutrino interactions at the energy scale below a few GeV. The data collected with the ND280 are used to study charged- and neutral-current neutrino interaction rates and kinematics prior to oscillation, in order to reduce uncertainties in the oscillation measurements by the far detector. A key element of the near detector is the ND280 electromagnetic calorimeter (ECal), consisting of active scintillator bars sandwiched between lead sheets and read outwith multi-pixel photon counters (MPPCs). The ECal is vital to the reconstruction of neutral particles, and the identification of charged particle species. The ECal surrounds the Pi-0 detector (P0D) and the tracking region of the ND280, and is enclosed in the former UA1/NOMAD dipole magnet. This paper describes the design, construction and assembly of the ECal, as well as the materials from which it is composed. The electronic and data acquisition (DAQ) systems are discussed, and performance of the ECal modules, as deduced from measurements with particle beams, cosmic rays, the calibration system, and T2K data, is described., Comment: 45 pages, 29 PDF figures. This version is accepted for publication in JINST. It includes minor changes as recommended by the referee. In particular, a bit of further information and explanation is added to several sections

Published
2013
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5. Spectroscopy of $^{26}$F

Author

Stanoiu, M., Sohler, D., Sorlin, O., Dombradi, Zs., Azaiez, F., Brown, B. A., Borcea, C., Bourgeois, C., Elekes, Z., Fülöp, Zs., Grévy, S., Guillemaud-Mueller, D., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Timar, J., and Timis, C.

Subjects
Nuclear Experiment
Abstract

The structure of the weakly-bound $^{26}_{\;\;9}$F$_{17}$ odd-odd nucleus, produced from $^{27,28}$Na nuclei, has been investigated at GANIL by means of the in-beam $\gamma$-ray spectroscopy technique. A single $\gamma$-line is observed at 657(7) keV in $^{26}_{9}$F which has been ascribed to the decay of the excited J=$2^+$ state to the J=1$^+$ ground state. The possible presence of intruder negative parity states in $^{26}$F is also discussed., Comment: 3 pages, 1 figure, accepted for publication in Physical Review C

Published
2012
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6. Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction

Author

Catford, W. N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N. A., Fernandez-Dominguez, B., Chapman, R., Freer, M., Chartier, M., Savajols, H., Rejmund, M., Achouri, N. L., Amzal, N., Ashwood, N. I., Baldwin, T. D., Burns, M., Caballero, L., Casadjian, J. M., Curtis, N., de France, G., Gelletly, W., Liang, X., Pain, S. D., Pucknell, V. P. E., Rubio, B., Sorlin, O., Spohr, K., Theisen, Ch., and Warner, D. D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction., Comment: Phys. Rev. Lett. in press (4 pages, 3 figures)

Published
2010
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7. Neutron Transfer Studied with a Radioactive beam of 24Ne, using TIARA at SPIRAL

Author

Catford, W. N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N. A., Caballero, L., Chapman, R., Chartier, M., Rejmund, M., and Savajols, H.

Subjects
Nuclear Experiment
Abstract

A general experimental technique for high resolution studies of nucleon transfer reactions using radioactive beams is briefly described, together with the first new physics results that have been obtained with the new TIARA array. These first results from TIARA are for the reaction 24Ne(d,p)25Ne, studied in inverse kinematics with a pure radioactive beam of 100,000 pps from the SPIRAL facility at GANIL. The reaction probes the energies of neutron orbitals relevant to very neutron rich nuclei in this mass region and the results highlight the emergence of the N=16 magic number for neutrons and the associated disappearance of the N=20 neutron magic number for the very neutron rich neon isotopes., Comment: Proceedings of the Carpathian Summer School of Physics, Mamaia-Constanta, Romania, 13-24 June 2005

Published
2009

8. TIARA: a large solid angle silicon array for direct reaction studies with radioactive beams

Author

Labiche, M., Catford, W. N., Lemmon, R. C., Timis, C. N., Chapman, R., Orr, N. A., Fernandez-Dominguez, B., Moores, G., Achouri, N. L., Amzal, N., Appleton, S., Ashwood, N. I., Baldwin, T. D., Burns, M., Caballero, L., Cacitti, J., Casadjian, J. M., Chartier, M., Curtis, N., Faiz, K., de France, G., Freer, M., Gautier, J. M., Gelletly, W., Iltis, G., Lecornu, B., Liang, X., Marry, C., Merrer, Y., Olivier, L., Pain, S. D., Pucknell, V. F. E., Raine, B., Rejmund, M., Rubio, B., Saillant, F., Savajols, H., Sorlin, O., Spohr, K., Theisen, Ch., Voltolini, G., and Warner, D. D.

Subjects
Nuclear Experiment
Abstract

A compact, quasi-4pi position sensitive silicon array, TIARA, designed to study direct reactions induced by radioactive beams in inverse kinematics is described here. The Transfer and Inelastic All-angle Reaction Array (TIARA) consists of 8 resistive charge division detectors forming an octagonal barrel around the target and a set of double-sided silicon-strip annular detectors positioned at each end of the barrel. The detector was coupled to the -ray array EXOGAM and the spectrometer VAMOS at the GANIL Laboratory to demonstrate the potential of such an apparatus with radioactive beams. The 14N(d,p)15N reaction, well known in direct kinematics, has been carried out in inverse kinematics for that purpose. The observation of the 15N ground state and excited states at 7.16 and 7.86 MeV is presented here as well as the comparison of the measured proton angular distributions with DWBA calculations. Transferred l-values are in very good agreement with both theoretical calculations and previous experimental results obtained in direct kinematics., Comment: 12 figures, submitted to NIM A

Published
2009
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9. B(E1) Strengths from Coulomb Excitation of 11Be

Author

Summers, N. C., Pain, S. D., Orr, N. A., Catford, W. N., Angelique, J. C., Ashwood, N. I., Bouchat, V., Clarke, N. M., Curtis, N., Freer, M., Fulton, B. R., Hanappe, F., Labiche, M., Lecouey, J. L., Lemmon, R. C., Mahboub, D., Ninane, A., Normand, G., Nunes, F. M., Soic, N., Stuttge, L., Timis, C. N., Thompson, I. J., Winfield, J. S., and Ziman, V.

Subjects
Nuclear Theory
Abstract

The $B$(E1;$1/2^+\to1/2^-$) strength for $^{11}$Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for $^{11}$Be+$^{208}$Pb at 38.6 MeV/nucleon is reported. The $B$(E1) strength of 0.105(12) e$^2$fm$^2$ derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, i n contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e$^2$fm$^2$. This value is in good agreement with the value deduced independently from the lifetime of the $1/2^-$ state in $^{11}$Be, and has a comparable p recision., Comment: 5 pages, 2 figures, accepted for publication in Phys. Lett. B

Published
2007
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10. Structure of 12Be: intruder d-wave strength at N=8

Author

Pain, S. D., Catford, W. N., Orr, N. A., Angelique, J. C., Ashwood, N. I., Bouchat, V., Clarke, N. M., Curtis, N., Freer, M., Fulton, B. R., Hanappe, F., Labiche, M., Lecouey, J. L., Lemmon, R. C., Mahboub, D., Ninane, A., Normand, G., Soic, N., Stuttge, L., Timis, C. N., Tostevin, J. A., Winfield, J. S., and Ziman, V.

Subjects
Nuclear Experiment
Abstract

The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the 0 hbar omega neutron p1/2-orbital and the 1 hbar omega, neutron d5/2 intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be., Comment: 5 pages, 2 figures

Published
2005
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12. Experimental evidence of a v (1d5/2)2 component to the 12Be ground state

Author

Pain, S. D., Catford, W. N., Orr, N. A., Angelique, J. C., Ashwood, N. I., Bouchat, V., Clarke, N. M., Curtis, N., Freer, M., Fulton, B. R., Hanappe, F., Labiche, M., Lecouey, J. L., Lemmon, R. C., Mahboub, D., Ninane, A., Normand, G., Soić, N., Stuttge, L., Timis, C. N., Tostevin, J. A., Winfield, J. S., Ziman, V., Gross, Carl J., editor, Nazarewicz, Witold, editor, and Rykaczewski, Krzysztof P., editor

Published
2005
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13. Shape coexistence in 74Kr and 76Kr

Author

Görgen, A., Clément, E., Korten, W., Bouchez, E., Chatillon, A., Hürstel, A., Le Coz, Y., Theisen, Ch., Wilson, J. N., Zielinska, M., Andreoiu, C., Becker, F., Butler, P., Casandjian, J. M., Catford, W. N., Czosnyka, T., de France, G., Gerl, J., Herzberg, R.-D., Iwanicki, J., Jenkins, D. G., Jones, G. D., Napiorkowski, P. J., Sletten, G., and Timis, C.

Published
2007
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14. Single particle structure of exotic nuclei with transfer reactions

Author

Fernández-Domínguez, B., Lemmon, R.C., Timis, C., Labiche, M., Catford, W.N., Chartier, M., Ashwood, N.I., Amzal, N., Baldwin, T.D., Burns, M., Caballero, L., Chapman, R., Curtis, N., de France, G., Freer, M., Gelletly, W., Liang, X., Orr, N.A., Pain, S.D., Pucknell, V.P.E., Rejmund, M., Rubio, B., Savajols, H., Sorlin, O., Spohr, K., Thiesen, C., and Warner, D.D.

Published
2007
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16. Spectroscopy of neutron-deficient nuclei around 36Ca

Author

Bürger, A., Stanoiu, M., Azaiez, F., Dombrádi, Zs., Algora, A., Al-Khatib, A., Bastin, B., Benzoni, G., Borcea, R., Bourgeois, Ch., Bringel, P., Clément, E., Dalouzy, J.-C., Dlouhý, Z., Drouart, A., Engelhardt, C., Franchoo, S., Fülöp, Zs., Görgen, A., Grévy, S., Hübel, H., Ibrahim, F., Korten, W., Mrázek, J., Navin, A., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M.-G., Sletten, G., Sohler, D., Sorlin, O., Theisen, Ch., Timis, C., Verney, D., and Williams, S.

Published
2007
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17. Gamma spectroscopy of the last bound oxygen isotopes

Author

Stanoiu, M., primary, Azaiez, F., additional, Becker, F., additional, Belleguic, M., additional, Borcea, C., additional, Bourgeois, C., additional, Dlouhy, Z., additional, Dombradi, Z., additional, Fülöp, Zs., additional, Grevy, S., additional, Kerek, A., additional, Krasznahorkay, A., additional, Lewitowicz, M., additional, Lukyanov, S., additional, van der Marel, H., additional, Mayet, P., additional, Mrazek, J., additional, Mandal, S., additional, Guillemaud-Muller, D., additional, Negoita, F., additional, Penionzhkevich, Y. E., additional, Podolyak, Z., additional, Roussel-Chomaz, P., additional, Saint Laurent, M. G., additional, Savajols, H., additional, Sorlin, O., additional, Sletten, G., additional, Sohler, D., additional, Timar, J., additional, Timis, C., additional, and Yamamoto, A., additional

Published
2003
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19. Chronology of the three-body dissociation of 8 He

Author

Laurent, B., Marqués, F.M., Angulo, C., Ashwood, N. I., García Borge, María José, Bouchat, V., Catford, W.N., Clarke, N. M., Curtis, N., Freer, M., Hanappe, F., Kinnard, V., Labiche, M., Materna, T., McEwan, P., Nilsson, T., Ninane, A., Normand, G., Orr, N.A., Pain, S.D., Prokhorova, E., Stuttgé, L., Timis, C., Laurent, B., Marqués, F.M., Angulo, C., Ashwood, N. I., García Borge, María José, Bouchat, V., Catford, W.N., Clarke, N. M., Curtis, N., Freer, M., Hanappe, F., Kinnard, V., Labiche, M., Materna, T., McEwan, P., Nilsson, T., Ninane, A., Normand, G., Orr, N.A., Pain, S.D., Prokhorova, E., Stuttgé, L., and Timis, C.

Abstract

The space and time configurations of the dissociation of He into He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of He, consistent with neutrons being emitted from a Gaussian volume of fm with a n-n delay in the sequential channel of 1400 400 fm/c, in agreement with the lifetime of He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n -n delay. The validity of the phenomenological model used is discussed.

Published
2019

20. Chronology of the three-body dissociation of 8He

Author

Laurent, B, primary, Marqués, F M, additional, Angulo, C, additional, Ashwood, N I, additional, Borge, M J G, additional, Bouchat, V, additional, Catford, W N, additional, Clarke, N M, additional, Curtis, N, additional, Freer, M, additional, Hanappe, F, additional, Kinnard, V, additional, Labiche, M, additional, Materna, T, additional, McEwan, P, additional, Nilsson, T, additional, Ninane, A, additional, Normand, G, additional, Orr, N A, additional, Pain, S D, additional, Prokhorova, E, additional, Stuttgé, L, additional, and Timis, C, additional

Published
2019
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22. Study of drip line nuclei through two-step fragmentation

Author

Stanoiu, M., Azaiez, F., Becker, F., Belleguic, M., Borcea, C., Bourgeois, C., Brown, B. A., Dlouhý, Z., Dombrádi, Z., Fülöp, Z., Grawe, H., Grévy, S., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S., van der Marel, H., Mayet, P., Mrázek, J., Mandal, S., Guillemaud-Mueller, D., Negoita, F., Penionzhkevich, Y. E., Podolyák, Z., Roussel-Chomaz, P., Saint Laurent, M. G., Savajols, H., Sorlin, O., Sletten, G., Sohler, D., Timár, J., Timis, C., and Yamamoto, A.

Published
2003
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23. The Electromagnetic Calorimeter for the T2K Near Detector ND280

Author

Allan, D, Andreopoulos, C, Angelsen, C, Barker, GJ, Barr, G, Bentham, S, Bertram, I, Boyd, S, Briggs, K, Calland, RG, Carroll, J, Cartwright, SL, Carver, A, Chavez, C, Christodoulou, G, Coleman, J, Cooke, P, Davies, G, Densham, C, Di Lodovico, F, Dobson, J, Duboyski, T, Durkin, T, Evans, DL, Finch, A, Fitton, M, Gannaway, FC, Grant, A, Grant, N, Grenwood, S, Guzowski, P, Hadley, D, Haigh, M, Harrison, PF, Hatzikoutelis, A, Haycock, TDJ, Hyndman, A, Ilic, J, Ives, S, Kaboth, AC, Kasey, V, Kellet, L, Khaleeq, M, Kogan, G, Kormos, LL, Lawe, M, Lawson, TB, Lister, C, Litchfield, RP, Lockwood, M, Malek, M, Maryon, T, Masliah, P, Mavrokoridis, K, McCauley, N, Mercer, I, Metelko, C, Morgan, B, Morris, J, Muir, A, Murdoch, M, Nicholls, T, Noy, M, O'Keeffe, HM, Owen, RA, Payne, D, Pearce, GF, Perkin, JD, Poplawska, E, Preece, R, Qian, W, Ratoff, P, Raufer, T, Raymond, M, Reeves, M, Richards, D, Rooney, M, Sacco, R, Sadler, S, Schaack, P, Scott, M, Scully, DI, Short, S, Siyad, M, Smith, R, Still, B, Sutcliffe, P, Taylor, IJ, Terri, R, Thompson, LF, Thorley, A, Thorpe, M, Timis, C, Touramanis, C, Uchida, MA, Uchida, Y, Vacheret, A, Van Schalkwyk, JF, Veledar, O, Waldron, AV, Ward, MA, Ward, GP, Wark, D, Wascko, MO, Weber, A, West, N, Whitehead, LH, Wilkinson, C, Wilson, R, and Collaboration, T2K UK

Subjects
Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Detector, High Energy Physics::Phenomenology, T2K experiment, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Tracking (particle physics), Nuclear physics, Dipole magnet, Muon neutrino, High Energy Physics::Experiment, Detectors and Experimental Techniques, Neutrino, physics.ins-det, Instrumentation, Electron neutrino, Mathematical Physics, Lepton
Abstract

The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and the Super-Kamiokande detector. Special emphasis is placed on measuring the mixing angle theta_13 by observing electron neutrino appearance via the sub-dominant muon neutrino to electron neutrino oscillation, and searching for CP violation in the lepton sector. The experiment includes a sophisticated, off-axis, near detector, the ND280, situated 280 m downstream of the neutrino production target in order to measure the properties of the neutrino beam and to understand better neutrino interactions at the energy scale below a few GeV. The data collected with the ND280 are used to study charged- and neutral-current neutrino interaction rates and kinematics prior to oscillation, in order to reduce uncertainties in the oscillation measurements by the far detector. A key element of the near detector is the ND280 electromagnetic calorimeter (ECal), consisting of active scintillator bars sandwiched between lead sheets and read outwith multi-pixel photon counters (MPPCs). The ECal is vital to the reconstruction of neutral particles, and the identification of charged particle species. The ECal surrounds the Pi-0 detector (P0D) and the tracking region of the ND280, and is enclosed in the former UA1/NOMAD dipole magnet. This paper describes the design, construction and assembly of the ECal, as well as the materials from which it is composed. The electronic and data acquisition (DAQ) systems are discussed, and performance of the ECal modules, as deduced from measurements with particle beams, cosmic rays, the calibration system, and T2K data, is described., Comment: 45 pages, 29 PDF figures. This version is accepted for publication in JINST. It includes minor changes as recommended by the referee. In particular, a bit of further information and explanation is added to several sections

Published
2016
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24. Nuclear structure studies of F-24

Author

Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fueloep, Zs., Grevy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, Andras, Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., de Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., Vajta, Zs., Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fueloep, Zs., Grevy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, Andras, Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., de Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., and Vajta, Zs.

Abstract

The structure of the F-24 nucleus has been studied at GANIL using the beta decay of O-24 and the in-beam.-ray spectroscopy from the fragmentation of Na-27,Na-28, Ne-25,Ne-26, and Mg-29,Mg-30 nuclei. Combining these complementary experimental techniques, the level scheme of F-24 has been constructed up to 3.6 MeV by means of particle-gamma and particle-gamma gamma coincidence relations. Experimental results are compared to shell-model calculations using the standard USDA and USDB interactions as well as ab initio valence-space Hamiltonians calculated from the in-medium similarity renormalization group based on chiral two- and three-nucleon forces. Both methods reproduce the measured level spacings well, and this close agreement allows unidentified spins and parities to be consistently assigned., QC 20150917

Published
2015
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25. Nuclear structure studies of 24F

Author

Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fueloep, Zs., Grevy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., de Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., Vajta, Zs., Caceres, L., Lepailleur, A., Sorlin, O., Stanoiu, M., Sohler, D., Dombradi, Zs., Bogner, S. K., Brown, B. A., Hergert, H., Holt, J. D., Schwenk, A., Azaiez, F., Bastin, B., Borcea, C., Borcea, R., Bourgeois, C., Elekes, Z., Fueloep, Zs., Grevy, S., Gaudefroy, L., Grinyer, G. F., Guillemaud-Mueller, D., Ibrahim, F., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mrazek, J., Negoita, F., de Oliveira, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Porquet, M. G., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Thomas, J. C., Timar, J., Timis, C., and Vajta, Zs.

Published
2015

26. The electromagnetic calorimeter for the T2K near detector ND280

Author

Allan, D, Andreopoulos, C, Angelsen, C, Barker, GJ, Barr, G, Bentham, S, Bertram, I, Boyd, S, Briggs, K, Calland, RG, Carroll, J, Cartwright, SL, Carver, A, Chavez, C, Christodoulou, G, Coleman, J, Cooke, P, Davies, G, Densham, C, Di Lodovico, F, Dobson, J, Duboyski, T, Durkin, T, Evans, DL, Finch, A, Fitton, M, Gannaway, FC, Grant, A, Grant, N, Grenwood, S, Guzowski, P, Hadley, D, Haigh, M, Harrison, PF, Hatzikoutelis, A, Haycock, TDJ, Hyndman, A, Ilic, J, Ives, S, Kaboth, AC, Kasey, V, Kellet, L, Khaleeq, M, Kogan, G, Kormos, LL, Lawe, M, Lawson, TB, Lister, C, Litchfield, RP, Lockwood, M, Malek, M, Maryon, T, Masliah, P, Mavrokoridis, K, McCauley, N, Mercer, I, Metelko, C, Morgan, B, Morris, J, Muir, A, Murdoch, M, Nicholls, T, Noy, M, O'Keeffe, HM, Owen, RA, Payne, D, Pearce, GF, Perkin, JD, Poplawska, E, Preece, R, Qian, W, Ratoff, P, Raufer, T, Raymond, M, Reeves, M, Richards, D, Rooney, M, Sacco, R, Sadler, S, Schaack, P, Scott, M, Scully, DI, Short, S, Siyad, M, Smith, R, Still, B, Sutcliffe, P, Taylor, IJ, Terri, R, Thompson, LF, Thorley, A, Thorpe, M, Timis, C, Touramanis, C, Uchida, MA, Uchida, Y, Vacheret, A, Van Schalkwyk, JF, Veledar, O, Waldron, AV, Uchida, Melissa [0000-0002-6496-2319], and Apollo - University of Cambridge Repository

Subjects
Calorimeters, Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Neutrino detectors, Scintillators and scintillating fibres and light guides
Abstract

The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and the Super-Kamiokande detector. Special emphasis is placed on measuring the mixing angle θ 13 by observing ν e appearance via the sub-dominant νμ ν e oscillation and searching for CP violation in the lepton sector. The experiment includes a sophisticated, off-axis, near detector, the ND280, situated 280 m downstream of the neutrino production target in order to measure the properties of the neutrino beam and to understand better neutrino interactions at the energy scale below a few GeV. The data collected with the ND280 are used to study charged- and neutral-current neutrino interaction rates and kinematics prior to oscillation, in order to reduce uncertainties in the oscillation measurements by the far detector. A key element of the near detector is the ND280 electromagnetic calorimeter (ECal), consisting of active scintillator bars sandwiched between lead sheets and read out with multi-pixel photon counters (MPPCs). The ECal is vital to the reconstruction of neutral particles, and the identification of charged particle species. The ECal surrounds the Pi-0 detector (PØD) and the tracking region of the ND280, and is enclosed in the former UA1/NOMAD dipole magnet. This paper describes the design, construction and assembly of the ECal, as well as the materials from which it is composed. The electronic and data acquisition (DAQ) systems are discussed, and performance of the ECal modules, as deduced from measurements with particle beams, cosmic rays, the calibration system, and T2K data, is described.© 2013 IOP Publishing Ltd and Sissa Medialab srl., The ECal detector has been built and is operated using funds provided by the Science and Technology Facilities Council U.K. Important support was also provided by the collaborating institutions. Individual researchers have been supported by the Royal Society and the European Research Council.

Published
2013

27. Spectroscopy of F-26

Author

Stanoiu, M, Sohler, D, Sorlin, O, Dombradi, Z, Azaiez, F, Brown, BA, Borcea, C, Bourgeois, C, Elekes, Z, Fueloep, Z, Grevy, S, Guillemaud-Mueller, D, Ibrahim, F, Kerek, A, Krasznahorkay, A, Lewitowicz, M, Lukyanov, SM, Mrazek, J, Negoita, F, Penionzhkevich, Y-E, Podolyak, Z, Porquet, MG, Roussel-Chomaz, P, Saint-Laurent, MG, Savajols, H, Sletten, G, Timar, J, and Timis, C

Published
2012

28. Nuclear structure studies ofF24

Author

Cáceres, L., primary, Lepailleur, A., additional, Sorlin, O., additional, Stanoiu, M., additional, Sohler, D., additional, Dombrádi, Zs., additional, Bogner, S. K., additional, Brown, B. A., additional, Hergert, H., additional, Holt, J. D., additional, Schwenk, A., additional, Azaiez, F., additional, Bastin, B., additional, Borcea, C., additional, Borcea, R., additional, Bourgeois, C., additional, Elekes, Z., additional, Fülöp, Zs., additional, Grévy, S., additional, Gaudefroy, L., additional, Grinyer, G. F., additional, Guillemaud-Mueller, D., additional, Ibrahim, F., additional, Kerek, A., additional, Krasznahorkay, A., additional, Lewitowicz, M., additional, Lukyanov, S. M., additional, Mrázek, J., additional, Negoita, F., additional, de Oliveira, F., additional, Penionzhkevich, Yu.-E., additional, Podolyák, Zs., additional, Porquet, M. G., additional, Rotaru, F., additional, Roussel-Chomaz, P., additional, Saint-Laurent, M. G., additional, Savajols, H., additional, Sletten, G., additional, Thomas, J. C., additional, Timàr, J., additional, Timis, C., additional, and Vajta, Zs., additional

Published
2015
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29. Migration of Nuclear Shell Gaps Studied in the d(Ne-24, p gamma)Ne-25 Reaction

Author

Caballero Ontanaya, Luis, Rubio, Berta, Catford, W.N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N. A., Fernández-Domínguez, B., Chapman, R., Freer, M., Chartier, M., Savajols, H., Rejmund, M., Achouri, N.L., Amzal, N., Ashwood, N. I., Baldwin, T. D., Burns, M., Casadjian, J. M., Curtis, N., France, G. de, Gelletly, W., Liang, X., Pain, S. D., Pucknell, V. F. E., Sorlin, O., Spohr, K. -M., Theisen, Ch., and Warner, D. D.

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

The transfer of neutrons onto Ne-24 has been measured using a reaccelerated radioactive beam of Ne-24 to study the (d, p) reaction in inverse kinematics. The unusual raising of the first 3/2(+) level in Ne-25 and its significance in terms of the migration of the neutron magic number from N = 20 to N = 16 is put on a firm footing by confirmation of this state's identity. The raised 3/2(+) level is observed simultaneously with the intruder negative parity 7/2(-) and 3/2(-) levels, providing evidence for the reduction in the N = 20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2(+) state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction., The authors acknowledge the excellent support provided by the technical staff of LPC and GANIL.

Published
2010

30. Excited states in the neutron-rich nucleus F-25

Author

Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G. R., Azaiez, F., Dombradi, Zs., Sorlin, O., Brown, B. A., Belleguic, M., Borcea, C., Bourgeois, C., Dlouhy, Z., Elekes, Z., Fueloep, Zs., Grevy, S., Guillemaud-Mueller, D., Hagen, G., Hjorth-Jensen, M., Ibrahim, F., Kerek, Andras, Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mandal, S., Mayet, P., Mrazek, J., Negoita, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Timar, J., Timis, C., Yamamoto, A., Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G. R., Azaiez, F., Dombradi, Zs., Sorlin, O., Brown, B. A., Belleguic, M., Borcea, C., Bourgeois, C., Dlouhy, Z., Elekes, Z., Fueloep, Zs., Grevy, S., Guillemaud-Mueller, D., Hagen, G., Hjorth-Jensen, M., Ibrahim, F., Kerek, Andras, Krasznahorkay, A., Lewitowicz, M., Lukyanov, S. M., Mandal, S., Mayet, P., Mrazek, J., Negoita, F., Penionzhkevich, Yu. -E., Podolyak, Zs., Roussel-Chomaz, P., Saint-Laurent, M. G., Savajols, H., Sletten, G., Timar, J., Timis, C., and Yamamoto, A.

Abstract

The structure of the nucleus F-25(9) was investigated through in-beam. gamma-ray spectroscopy of the fragmentation of Ne-26 and Na-27,Na-28 ion beams. Based on the particle-gamma and particle-gamma gamma coincidence data, a level scheme was constructed and compared with shell model and coupled-cluster calculations. Some of the observed states were interpreted as quasi-single-particle states built on top of the closed-shell nucleus O-24, while the others were described as states arising from coupling of a single proton to the 2(broken vertical bar) core excitation of O-24., QC 20140813

Published
2014
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31. Excited states in the neutron-rich nucleus25 F

Author

Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G.R., Azaiez, F, Dombradi, Zs., Sorlin, O., Brown, B.A., Belleguie, M., Borcea, C., Hagemann, Gudrun Bertram, Sletten, Geirr, Timis, C., Yamamoto, A., Vajta, Zs., Stanoiu, M., Sohler, D., Jansen, G.R., Azaiez, F, Dombradi, Zs., Sorlin, O., Brown, B.A., Belleguie, M., Borcea, C., Hagemann, Gudrun Bertram, Sletten, Geirr, Timis, C., and Yamamoto, A.

Published
2014

32. Normal occupancy of deeply bound valence neutrons in $^{37}$Ca

Author

Buerger, A., Azaiez, F., Algora, A., Al-Khatib, A., Bastin, B., Benzoni, G., Borcea, R., Bourgeois, C., Bringel, P., Clément, E., Dalouzy, J.C., Dlouhy, Z., Dombradi, Z., Drouart, A., Engelhardt, C., Franchoo, S., Fulop, Z., Goergen, A., Grévy, S., Huebel, H., Ibrahim, F., Korten, W., Mrazek, J., Navin, A., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M.G., Sletten, G., Sohler, D., Sorlin, O., Stanoiu, M., Stefan, I., Theisen, Ch., Timis, C., Verney, D., Williams, S., Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

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

International audience

Published
2008

33. 1n- and 2n-transfer with the Borromean nucleus $^{6}$He near the Coulomb barrier

Author

Chatterjee, Avhishek, Navin, A., Shrivastava, A., Bhattacharyya, S., Rejmund, M., Keeley, N., Nanal, V., Nyberg, J., Pillay, R.G., Ramachandran, K., Stefan, I., Bazin, Dominique, Beaumel, D., Blumenfeld, Y., De France, G., Gupta, D., Labiche, M., Lemasson, A., Lemmon, R., Raabe, R., Scarpaci, J.A., Simenel, C., Timis, C., 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), Nuclear Physics Division, Bhabha Atomic Research Centre (BARC), Government of India, Department of Atomic Energy-Government of India, Department of Atomic Energy, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of Nuclear Reactions, The Andrzej Soltan Intitute for Nuclear Studies, DNAP, Tata Institue of Fundamental research, Department of Physics [Jyväskylä Univ] (JYU), University of Jyväskylä (JYU), National Superconducting Cyclotron Laboratory, Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Institut de Physique Nucléaire d'Orsay (IPNO), 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), CCLRC, Daresbury Laboratory, Department of Physics, University of Surrey (UNIS), SPIRAL, 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 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)

Subjects
Unstable nucleus induced transfer reactions, Détecteur EXOGAM, 25.60.-t, 24.50.+g, 25.70.Jj, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Properties of nuclei with 6≤A≤19, Direct nuclear reactions, Heavy ion-induced fusion and fusion-fission reactions
Abstract

Accepetd for publication in Physical Review Letters; Angular distributions for 1n- and 2n-transfer are reported for the 6He + 65Cu system at Elab = 22.6 MeV. For the first time, triple coincidences between particles, neutrons and characteristic rays from the target-like residues were used to separate the contributions arising from 1n- and 2n-transfer. The differential cross sections for these channels, elastic scattering, and fusion were analyzed using a Coupled Reaction Channels approach. The large measured ratio of the 2n/1n cross section and the strong influence of 2n-transfer on other channels indicate that the di-neutron configuration of 6He plays a dominant role in the reaction mechanism.

Published
2008
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34. B(E1) Strengths from Coulomb Excitation of $^{11}$Be

Author

Summers, N. C., Pain, S. D., Orr, N. A., Catford, W. N., Angelique, J. C., Ashwood, N. I., Bouchat, V., Clarke, N. M., Curtis, N., Freer, M., Fulton, B. R., Hanappe, F., Labiche, M., Lecouey, J. L., Lemmon, R. C., Mahboub, D., Ninane, A., Normand, G., Nunes, F. M., Soic, N., Stuttge, L., Timis, C. N., Thompson, I. J., Winfield, J. S., Ziman, V., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear Theory (nucl-th), Coulomb excitation, extended continuum discretized coupled channels method, 11Be, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment
Abstract

The $B$(E1;$1/2^+\to1/2^-$) strength for $^{11}$Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for $^{11}$Be+$^{208}$Pb at 38.6 MeV/nucleon is reported. The $B$(E1) strength of 0.105(12) e$^2$fm$^2$ derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, i n contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e$^2$fm$^2$. This value is in good agreement with the value deduced independently from the lifetime of the $1/2^-$ state in $^{11}$Be, and has a comparable p recision., Comment: 5 pages, 2 figures, accepted for publication in Phys. Lett. B

Published
2007
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35. Spectroscopy around $^{36}$Ca

Author

Bürger, A., Azaiez, F., Stanoiu, M., Dombradi, Z., Algora, A., Al-Khatib, A., Bastin, B., Benzoni, G., Borcea, R., Bourgeois, C., Bringel, P., Clement, E., Dalouzy, J.C., Dlouhy, Z., Drouart, A., Engelhardt, C., Franchoo, S., Fülöp, Zs., Gorgen, A., Grévy, S., Hübel, H., Ibrahim, F., Korten, W., Mrazek, J., Navin, A., Timis, C., Rotaru, F., Roussel-Chomaz, P., Saint-Laurent, M.G., Sletten, G., Sohler, D., Sorlin, O., Theisen, C., Verney, D., Williams, S., Girod, Dominique, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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), and 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)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 21.10.-k, 23.20.Lv, 27.30+t
Abstract

Expérience GANIL; International audience; An experiment was performed to study excited states in neutron-deficient nuclei around Ca. A one-neutron knockout reaction was used to produce $^{36}$Ca ions from a $^{37}$Ca secondary beam, and in-beam $\gamma$-rays were measured. The $2^+$ energy in $^{36}$Ca is compared to the mirror nucleus $^{36}$S to deduce information on the isospin dependence of the nuclear force near the proton drip line. The energy of the first excited $2^+$ state in $^{36}$Ca and the cross section for the 1-neutron knock-out reaction from $^{37}$Ca at $\sim$ 45 · AMeV were obtained. Furthermore, for two other $T_z$ = −2 nuclei, $^{28}$S and $^{32}$Ar, the de-excitation of the first $2^+$ state has been observed.

Published
2007

36. Shape coexistence in neutron-deficient Krypton isotopes studied by low-energy Coulomb excitation of radioactive ion beams

Author

Görgen, A., Clément, E., Korten, W., Bouchez, E., Chatillon, A., Hürstel, A., Le Coz, Y., Theisen, Ch., Wilson, J.N., Andreoiu, C., Becker, F., Butler, P., Casandjian, J.M., Catford, W.N., Czosnyka, T., de France, G., Gerl, J., Herzberg, R.-D., Iwanicki, J., Jenkins, D.G., Jones, G.D., Napiorkowski, P.J., Sletten, G., Timis, C., Zielinska, M., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), European Organization for Nuclear Research (CERN), 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), G. Cuttone, A. Gadea, M. Lattuada, S. Lunardi, R. Menegazzo, D. Pierroutsakou, C. Signorini, F. Soramel, L. Tecchio, A. Vitturi, Lion, Michel, and 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)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2006

37. Studies of Single-Particle Structure in the N=16 Region Using Transfer Reactions

Author

Lemmon, R. C., Beatriz Fernandez Dominguez, Timis, C., Labiche, M., Catford, W. N., Chartier, M., Ashwood, N., Amzal, N., Baldwin, T. D., Burns, M., Caballero, L., Chapman, R., Curtis, N., France, G., Freer, M., Gelletly, W., Liang, X., Orr, N. A., Pain, S. D., Pucknell, V. P. E., Rejmund, M., Rubi, B., Savajols, H., Sarlin, O., Spohr, K., Thiesen, C., Warner, D. D., Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), L.Corradi, D. Ackermann, E. Fioretto, A. Gadea, F. Haas, G. Pollarolo, F. Scarlassara, Suzana Szilner, M. Trotta, EXOGAM, SPIRAL, VAMOS, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear reaction, nuclei with mass number 20 to 38, Spectrometer, Cyclotron, Hadron, 020206 networking & telecommunications, Elementary particle, 02 engineering and technology, Fermion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], law.invention, Nuclear physics, law, nuclear structure, 0202 electrical engineering, electronic engineering, information engineering, Measuring instrument, deuteron-nucleus reactions, 21.10.Pc, 25.45.Hi, 27.30.+t, 020201 artificial intelligence & image processing, neon, Nuclear Experiment, Nucleon
Abstract

International audience; We have developed a new experimental setup based at the GANIL/SPIRAL facility in Caen, France to measure one-nucleon transfer reactions in inverse kinematics in order to study the evolution of the single particle structure of exotic nuclei. The setup couples together three state-of-the-art detection systems: the TIARA Si array, the large-acceptance magnetic spectrometer VAMOS and the high-efficiency segmented Ge gamma-ray array EXOGAM. In a first experiment, the $^{24}$Ne(d,p)$^{25}$Ne reaction has been studied to probe the N=16 shell closure. Details of the setup, data analysis and preliminary results are presented.

Published
2006
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38. Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions

Author

Fernandez-Dominguez, B., Lemmon, R. C., Timis, C., Labiche, A., Catford, W. N., Chartier, M., Ashwood, N., Amzal, N., Baldwin, T. D., Burns, M., Caballero, L., Chapman, R., Curtis, N., France, G., Freer, M., Gelletly, W., Liang, X., Orr, N. A., Steven Pain, Pucknellt, V. P. E., Rejmund, M., Rubio, B., Savajols, H., Sorlin, O., Spohr, K., Thiesen, C., Warner, D. D., 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), S.V. Harissopulos, P. Demetriou, E. Julin, EXOGAM, 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, nuclei with mass number 20 to 38, spectrometers, Spectrometer, germanium radiation detectors, 21.10.Pc, 25.60.Je, 27.30.+t, 29.30.-h, 29.40.Wk, Nuclear structure, chemistry.chemical_element, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Semiconductor detector, Nuclear physics, Neon, Germanium radiation detectors, Deuterium, chemistry, nuclear structure, 0202 electrical engineering, electronic engineering, information engineering, Particle, 020201 artificial intelligence & image processing, neon, Nuclear Experiment, Beam (structure)
Abstract

The TIARA+VAMOS+EXOGAM set-up has recently been installed at GANIL to study the single-particle structure of exotic nuclei. The unique characteristics of the TIARA array, combined with the large acceptance spectrometer VAMOS and the high efficiency Germanium detector array EXOGAM, has allowed high-resolution measurements of transfer reactions in inverse kinematics using low intensity exotic beams. We will describe the experimental set-up, data analysis and preliminary results of the first experiments using a $^{24}$Ne beam from SPIRAL, concentrating in particular on the performance of VAMOS that has been used to detect the heavy fragments after the (d,p), (d,d) and (d,t) reactions.

Published
2005
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39. Neutron Transfer Studied with a Radioactive beam of 24Ne, using TIARA at SPIRAL

Author

Catford, W. N., Timis, C. N., Roy Lemmon, Labiche, M., Orr, N. A., Caballero, L., Chapman, R., Chartier, M., Rejmund, M., Savajols, H., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Normandie Université (NU)-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)-Centre National de la Recherche Scientifique (CNRS), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

A general experimental technique for high resolution studies of nucleon transfer reactions using radioactive beams is briefly described, together with the first new physics results that have been obtained with the new TIARA array. These first results from TIARA are for the reaction 24Ne(d,p)25Ne, studied in inverse kinematics with a pure radioactive beam of 100,000 pps from the SPIRAL facility at GANIL. The reaction probes the energies of neutron orbitals relevant to very neutron rich nuclei in this mass region and the results highlight the emergence of the N=16 magic number for neutrons and the associated disappearance of the N=20 neutron magic number for the very neutron rich neon isotopes., Comment: Proceedings of the Carpathian Summer School of Physics, Mamaia-Constanta, Romania, 13-24 June 2005

Published
2005

40. Experimental evidence of nu(1d 5/2)^2 component to the ^12Be ground state

Author

Pain, S. D., Catford, W. N., Orr, N. A., Angelique, J. C., Ashwood, N. I., Bouchat, V., Clarke, N. M., Curtis, N., Freer, M., Fulton, B. R., Hanappe, F., Labiche, M., Lecouey, J. L., Lemmon, R. C., Mahboub, D., Ninane, A., Normand, G., Soić, Neven, Stuttge, L., Timis, C. N., Tostevin, J. A., Winfield J. S., and Ziman, V.

Subjects
6 < A < 19, Nuclear reaction models and methods, Reactions induced by unstable nuclei, Low and intermediate energy heavy-ion reactions
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. Preliminary cross sections for the first (0.32 MeV, $^1/2 ^-}; ; ; $ ) and second (1.78 MeV, $^5/2 ^+}; ; ; $ , unbound) excited states in 11Be have been obtained, giving evidence of significant admixtures of both $\nu(1p_{; ; ; ^1\!/_2}; ; ; )^2$ and $\nu(1d_{; ; ; ^5\!/_2}; ; ; )^2$ configurations in the ground state of 12Be.

Published
2005

41. Evidence Of A (1)2 Component To The 12Be Ground State

Author

Pain, S.D., Catford, W.N., Orr, N.A., Angélique, J.C., I. Ashwood, N., Bouchat, V., Clarke, N.M., Curtis, N., Freer, M., Fulton, B., Hanappe, F., Labiche, M., Lecouey, J.L., Lemmon, R., Mahboub, D., Ninane, A., Normand, G., Soić, N., Stuttge, L., Timis, C., Tostevin, J.A., Ziman, V., Winfield, J., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université libre de Bruxelles (ULB), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS)

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

International audience; Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. The cross sections for the production of 11Be in its ground state (1/2+) and first excited state (0.32 MeV, 1/2−) have previously been measured, indicating a strong (2s½)2 component to the 12Be ground state. In the present experiment, performed at the GANIL laboratory, cross sections for the first (0.32 MeV, 1/2−) and second (1.78 MeV, 5/2+, unbound) excited states in 11Be were measured, which gives information on the admixture of (1p½)2 and (1math)2 components in the ground state of 12Be. A fragmentation beam of 12Be of ∼10000 pps (95% pure) was incident on a carbon target at 41 MeV/u. The beam particles were tracked onto the target, and their energies were measured event‐by‐event. The beam‐like residues were measured in a position sensitive telescope mounted at zero degrees, and neutrons were measured in the DéMoN array. The 1/2− state of 11Be was identified by measuring coincident 320 keV γ‐rays, using four NaI detectors. Full kinematic reconstruction of unbound states in 11Be was performed using coincident neutrons and 10Be ions. Detailed simulations were performed in order to interpret the data, and spectroscopic factors were calculated, using preliminary single particle removal cross sections calculated using a Glauber model. © 2005 American Institute of Physics

Published
2004
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42. Shape coexistence in light krypton isotopes

Author

Clement, E., Gorgen, A., Bouchez, E., Chatillon, A., Wolfram KORTEN, Le Coz, Y., Theisen, C., Andreoiu, C., Becker, F., Blank, B., Borcea, C., Buta, A., Butler, P., Casandjian, J. M., Catford, W. N., Czosnyka, T., Emsallem, A., France, G., Genevey, J., Gerl, J., Hannachi, F., Hauschild, K., Herzberg, R. D., Hurstel, A., Iwanicki, J., Jenkins, D., Jones, G., Lewitowicz, M., Lucas, R., Matea, I., Negoita, F., Santos, F. D., Pantelica, D., Pinston, J., Rahkila, P., Rejmund, M., Sletten, G., Stanoiu, M., Timis, C., Wadsworth, R., Wilson, J. N., Zielinska, M., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), 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), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), D. Seweryniak, Teng Lek Khoo, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université 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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Yrast, Krypton, 27.50.+e, 23.20.Lv, Isotopes of krypton, chemistry.chemical_element, deformed nuclei, 020206 networking & telecommunications, electron spectroscopy, 02 engineering and technology, Coulomb excitation, nuclear fragmentation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Electron spectroscopy, nuclei with mass number 59 to 89, Matrix (mathematics), nuclear isomerism, chemistry, Excited state, Diagonal matrix, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, isotopes, nuclear shape, krypton
Abstract

Matière Nucléaire - Commune avec NEX et ENL; International audience; Shape coexistence in the light krypton isotopes was studied in a series of experiments at GANIL using various experimental techniques. A new low-lying $0^+$ state, a so-called shape isomer, was found in delayed conversion-electron spectroscopy after fragmentation reactions. The systematics of such low-lying $0+^$ states suggests that the ground states of the isotopes $^{78}$Kr and $^{76}$Kr have prolate deformation, while states with prolate and oblate shape are practically degenerate and strongly mixed in $^{74}$Kr, and that the oblate configuration becomes the ground state in $^{72}$Kr. This scenario was tested in experiments performing low-energy Coulomb excitation of radioactive $^{76}$Kr and $^{74}$Kr beams from the SPIRAL facility. Both transitional and diagonal electromagnetic matrix elements were extracted from the observed $\gamma$-ray yields. The results find the prolate shape for the ground-state bands in $^{76}$Kr and $^{74}$Kr and an oblate deformation for the excited $2^{+}_{2}$ state in $^{74}$Kr, confirming the proposed scenario of shape coexistence

Published
2004
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43. Nucleon Transfer Reaction Studies at GANIL using Radioactive Nuclear Beams

Author

Labiche, M., Timis, C., Lemmon, R.C., Catford, W.N., Chapman, R., Rubio, B., Caballero, L., Amzal, N., Ashwood, N.I., Baldwin, T.D., Burns, M., Chartier, M., Curtis, N., de France, G., Gelletly, W., Liang, X., Freer, M., Orr, N.A., Pain, S., Pucknell, V.P.E., Rejmund, M., Savajols, H., Sorlin, O., Spohr, K., Theisen, C., Warner, D.D., 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), 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), EXOGAM, TIARA, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Lion, Michel, and 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)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2004

44. Breakup reaction studies of $^{10}$Be and $^{10,11}$B using a $^{10}$Be beam

Author

Ahmed, Mohamed-Salem, Freer, M., Angélique, J.C., Ashwood, N.I., Bouchat, V., Catford, W.N., Clarke, N.M., Curtis, N., Hanappe, F., Lecouey, J.L., Marqués, F.M., Materna, T., Ninane, A., Normand, G., Orr, N.A., Pain, S., Soic, N., Timis, C., Unshakova, A., Ziman, V.A., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Guesnon, Sandrine

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], heavy ion-nucleus reactions, nuclear shell model, nuclei with mass number 6 to 19, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

The structure of 10Be has been investigated by inelastic scattering to states above the breakup threshold using the reaction 12C(10Be, 10Be*-->6He+4He)12C at Ebeam = 302 MeV. Excited states in 10Be were observed at 9.6&plusmn ; ; 0.1 and 10.2&plusmn ; ; 0.1 MeV. No evidence was observed for the population of the 4+ member of the ground-state band of 10Be indicating the shell-model-like structure of the ground state. In addition, the decay of 8Be, 10B, and 11B, populated in the two-neutron, proton pickup, breakup and 1p pickup reactions, was reconstructed through the detection of coincident 4He+4He, 4He+6Li, and 4He+7Li particles. Cross sections for the formation of the 8Be, 9Be, 10B, and 11B were also deduced. Contrary to expectations, the two-neutron removal results in the production of 8Be predominantly (80%) in the first excited (2+) state. This suggests that dynamical excitations play an important role in the neutron removal process.

Published
2004

45. Neutron removal and cluster breakup of $^{14}$B and $^{14}$Be

Author

Ashwood, N.I., Freer, M., Angélique, J.C., Bouchat, V., Catford, W.N., Clarke, N.M., Curtis, N., Dorvaux, O., Hanappe, F., Kerckx, Y., Labiche, M., Lecouey, J.L., Marqués, F.M., Materna, T., Ninane, A., Normand, G., Orr, N.A., Pain, S., Soic, N., Stuttge, L., Timis, C., Unshakova, A., Ziman, V.A., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Heyd, Yvette

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, neutron removal and cluster breakup cross section, 14B, 14Be, cluster structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Measurements of the neutron removal and cluster breakup cross sections for the neutron-rich nuclei 14Be and 14B have been performed at 34.4 and 40.8 MeV/nucleon, respectively. Enhancement of the first chance cluster breakup cross section for 14Be compared to that of 14B provides evidence for a well-developed He cluster structure of the ground state of 14Be. Measurements of both the cross sections and decay-particle velocities suggest that multistep processes play an important role in the excitation and decay of both 14B and 14Be.

Published
2004

46. Experimental evidence of a v (1d5/2)2 component to the 12Be ground state

Author

Pain, S. D., primary, Catford, W. N., additional, Orr, N. A., additional, Angelique, J. C., additional, Ashwood, N. I., additional, Bouchat, V., additional, Clarke, N. M., additional, Curtis, N., additional, Freer, M., additional, Fulton, B. R., additional, Hanappe, F., additional, Labiche, M., additional, Lecouey, J. L., additional, Lemmon, R. C., additional, Mahboub, D., additional, Ninane, A., additional, Normand, G., additional, Soić, N., additional, Stuttge, L., additional, Timis, C. N., additional, Tostevin, J. A., additional, Winfield, J. S., additional, and Ziman, V., additional

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47. Excited states in the neutron-rich nucleus F25

Author

Vajta, Zs., primary, Stanoiu, M., additional, Sohler, D., additional, Jansen, G. R., additional, Azaiez, F., additional, Dombrádi, Zs., additional, Sorlin, O., additional, Brown, B. A., additional, Belleguic, M., additional, Borcea, C., additional, Bourgeois, C., additional, Dlouhy, Z., additional, Elekes, Z., additional, Fülöp, Zs., additional, Grévy, S., additional, Guillemaud-Mueller, D., additional, Hagen, G., additional, Hjorth-Jensen, M., additional, Ibrahim, F., additional, Kerek, A., additional, Krasznahorkay, A., additional, Lewitowicz, M., additional, Lukyanov, S. M., additional, Mandal, S., additional, Mayet, P., additional, Mrázek, J., additional, Negoita, F., additional, Penionzhkevich, Yu.-E., additional, Podolyák, Zs., additional, Roussel-Chomaz, P., additional, Saint-Laurent, M. G., additional, Savajols, H., additional, Sletten, G., additional, Timár, J., additional, Timis, C., additional, and Yamamoto, A., additional

Published
2014
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48. Spectroscopy at the N=20 shell closure : the $beta$-decay of $^{32}$Mg

Author

Grévy, S., Piétri, S., Achouri, N. L., Angélique, J. C., Baumann, P., Borcea, C., Buta, A., Catford, W., Sandrine Courtin, Daugas, J. M., Oliveira, F., Dessagne, P., Dlouhy, Z., Guillemaud-Mueller, D., Hadeler, R., Knipper, A., Lecolley, F. R., Lecouey, J. L., Lewitowicz, M., Liénard, E., Miehe, C., Mrazek, J., Negoita, F., Orr, N. A., Penionzhkevich, Y., Peter, J., Poirier, E., Stanoiu, M., Tarasov, O., Timis, C., Walter, G., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-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 de Physique Nucléaire d'Orsay (IPNO), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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), 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 Guesnon, Sandrine

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2003

49. First radioactive beam Coulomb excitation experiments on SPIRAL

Author

Bouchez, E., Chatillon, A., Hurstel, A., Korten, W., Le Coz, Y., Theisen, Ch., Casandjian, J.M., de France, G., Becker, F., Gerl, J., Czosnyka, T., Iwanicki, J., Zielinska, M., Butler, P., Herzberg, R., Jenkins, D., Jones, G., Sletten, G., Catford, W., Timis, C., 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), SPIRAL, and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

50. $\gamma$-spectroscopy of carbon and oxygen isotopes at the neutron drip-line

Author

Stanoiu, M., Azaiez, F., Becker, F., Belleguic, M., Borcea, C., Bourgeois, C., Dlouhy, Z., Dombradi, Z., Fulop, Z., Grevy, S., Kerek, A., Krasznahorkay, A., Lewitowicz, M., Lukyanov, S., Van Der Marel, H., Mayet, P., Mrazek, J., Mandal, S., Guillemaud-Mueller, D., Negoita, F., Penionzhkevich, U.E., Podolyak, Z., Roussel-Chomaz, P., Saint-Laurent, M.G., Savajols, H., Sorlin, O., Sletten, G., Sohler, D., Timar, J., Timis, C., Yamamoto, A., 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 de Physique Nucléaire d'Orsay (IPNO), 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), Lion, Michel, and 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)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

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