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134 results on '"Ziman, V. A."'

1. alpha-particle production in the scattering of 6He by 208Pb at energies around the Coulomb barrier

Author

Escrig, D., Sanchez-Benitez, A. M., Moro, A. M., Alvarez, M. A. G., Andres, M. V., Angulo, C., Borge, M. J. G., Cabrera, J., Cherubini, S., Demaret, P., Espino, J. M., Figuera, P., Freer, M., Garcia-Ramos, J. E., Gomez-Camacho, J., Gulino, M., Kakuee, O. R., Martel, I., Metelko, C., Perez-Bernal, F., Rahighi, J., Rusek, K., Smirnov, D., Tengblad, O., and Ziman, V.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

New experimental data from the scattering of 6He+208Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of $\alpha$ particles. The energy and angular distributions of this group have been analyzed and compared with theoretical calculations. This analysis indicates that the $\alpha$ particles emitted at backward angles in this reaction are mainly due to two-neutron transfer to weakly bound states of the final nucleus., Comment: 20 pages, 5 figures. Nuclear Physics A792 (2007) 2-17

Published
2007
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2. 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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3. 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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4. 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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5. Mass measurement of Re-190

Author

Griffiths, M R, primary, Wheldon, C, additional, Kokalova, Tz, additional, Turner, A, additional, Pirrie, S, additional, Ziman, V, additional, Ashwood, N I, additional, Malcolm, J D, additional, Barr, M, additional, Freer, M, additional, Faestermann, Th, additional, Wirth, H-F, additional, Hertenberger, R, additional, Gernhäuser, R, additional, and Krücken, R, additional

Published
2020
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8. Evidence for a 3.8 MeV state in 9Be

Author

Smith, Robin, Wheldon, Carl, Freer, Martin, Curtis, Neil, Kokalova, Tzany, Almaraz-Calderon, S., Aprahamian, A., Ashwood, N. I., Barr, M., Butcher, B., Copp, P., Couder, M., Fang, X., Goldring, G., Jung, F., Lesher, S. R., Lu, W., Malcolm, J. D., Roberts, A., Tan, W. P., and Ziman, V. A.

Abstract

The breakup reaction 9Be(4He,3a)n was measured using an array of four double-sided silicon strip detectors at beam energies of 22 and 26 MeV. Excited states in 9Be up to 8 MeV were populated and reconstructed through measurements of the charged reaction products. Evidence is given for a state in 9Be at 3.82-0.09+0.08 MeV with width=1240-90+270 keV. This is consistent with two recent measurements of a state with similar properties in the mirror nucleus 9B. An analysis of the reduced widths (Beg.s.8 channel) of this state along with the proposed mirror state has led to a firm limit of J

Published
2016

9. Disentangling unclear nuclear breakup channels of beryllium-9 using the three-axis Dalitz plot

Author

Smith, R, primary, Freer, M, additional, Wheldon, C, additional, Curtis, N, additional, Almaraz-Calderon, S, additional, Aprahamian, A, additional, Ashwood, N I, additional, Barr, M, additional, Bucher, B, additional, Copp, P, additional, Couder, M, additional, Fang, X, additional, Goldring, G, additional, Jung, F, additional, Kokalova, Tz, additional, Lesher, S R, additional, Lu, W, additional, Malcolm, J D, additional, Roberts, A, additional, Tan, W P, additional, and Ziman, V A, additional

Published
2017
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10. Excitation Function Measurements Of C-12(He-4,Be-8)Be-8, C-12(He-4,C-12[7.65, 0(+)])He-4, And C-12(He-4,C-12[9.64, 3(-)])He-4 Reactions

Author

Soylu, A., Freer, M., Ashwood, N. I., Curtis, N., Munoz-Britton, T., Spencer, S., Wheldon, C., Ziman, V., Brown, S., Thomas, J. S., Wilson, G., and [Soylu, A.] Nigde Univ, Dept Phys, Nigde, Turkey -- [Freer, M. -- Ashwood, N. I. -- Curtis, N. -- Munoz-Britton, T. -- Spencer, S. -- Wheldon, C. -- Ziman, V.] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England -- [Brown, S. -- Thomas, J. S. -- Wilson, G.] Univ Surrey, Sch Elect & Phys Sci, Guildford GU2 7XH, Surrey, England

Abstract

WOS: 000311141400005, In the present measurements a C-12 target was bombarded by a He-4 beam with energies from 14 to 21 MeV and the excitation function measurements for the reactions of the C-12(He-4, Be-8)Be-8, C-12(He-4, C-12[7.65, 0(+)])He-4, and C-12(He-4, C-12[9.64, 3(-)])He-4 were obtained using an array of 6 double-sided silicon strip detectors. The excitation functions are used to gain an insight into possible a-cluster structures in O-16., TUBITAK-BIDEB; Nigde University; Science and Technology Facilities Council [ST/E500651/1, ST/J000140/1], One of the authors (A.S.) would like to thank TUBITAK-BIDEB and Nigde University for financial support as well as Prof. Dr. S. Erturk and Prof. Dr. I. Boztosun for useful comments and discussions.

Published
2012

11. Structure of $^{24}$Mg Excited States and Their Influence on Nucleosynthesis

Author

Tokić, V., primary, Soić, N., additional, Blagus, S., additional, Fazinić, S., additional, Jelavić-Malenica, D., additional, Mijatović, T., additional, Miljanić, Đ., additional, Prepolec, L., additional, Skukan, N., additional, Szilner, S., additional, Uroić, M., additional, Milin, M., additional, Di Pietro, A., additional, Figuera, P., additional, Fernández-García, J.P., additional, Fisichella, M., additional, Lattuada, M., additional, Scuderi, V., additional, Strano, E., additional, Torresi, D., additional, Bailey, S., additional, Curtis, N., additional, Freer, M., additional, Smith, R., additional, Walshe, J., additional, Ziman, V., additional, Acosta, L., additional, Martel, I., additional, Marquinez-Durán, G., additional, Sánchez-Benítez, A.M., additional, and Fioretto, E., additional

Published
2017
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12. Be8+Be8andC12+αbreakup states inO16populated via theC13(He4,4α)nreaction

Author

Curtis, N., primary, Almaraz-Calderon, S., additional, Aprahamian, A., additional, Ashwood, N. I., additional, Barr, M., additional, Bucher, B., additional, Copp, P., additional, Couder, M., additional, Fang, X., additional, Freer, M., additional, Goldring, G., additional, Jung, F., additional, Lesher, S. R., additional, Lu, W., additional, Malcolm, J. D., additional, Roberts, A., additional, Tan, W. P., additional, Wheldon, C., additional, and Ziman, V. A., additional

Published
2016
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13. Evidence for a 3.8 MeV state inBe9

Author

Smith, R., primary, Wheldon, C., additional, Freer, M., additional, Curtis, N., additional, Kokalova, Tz., additional, Almaraz-Calderon, S., additional, Aprahamian, A., additional, Ashwood, N. I., additional, Barr, M., additional, Bucher, B., additional, Copp, P., additional, Couder, M., additional, Fang, X., additional, Goldring, G., additional, Jung, F., additional, Lesher, S. R., additional, Lu, W., additional, Malcolm, J. D., additional, Roberts, A., additional, Tan, W. P., additional, and Ziman, V. A., additional

Published
2016
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14. First excited 1/2(+) state in B-9

Author

Baldwin, TD, Catford, WN, Mahboub, D, Timis, CN, Ashwood, NI, Clarke, NM, Curtis, N, Ziman, V, Brown, TAD, Fox, SP, Fulton, BR, Groombridge, D, Watson, DL, Pucknell, VFE, and Weisser, DC

Published
2012

15. Elastic scattering and α-particle production in 6He + 208Pb collisions at 22 MeV

Author

Acosta Sánchez, Luis Armando, Sánchez Benítez, Ángel Miguel, Gómez Santamaría, Mario Emilio, Martel Bravo, Ismael, Pérez Bernal, Francisco, Pizarro, F., Rodríguez Quintero, José, Rusek, K., Álvarez, M. A. G., Andrés, M. V., Espino, José Manuel, Fernández García, J. P., Gómez Camacho, Joaquín, Moro, A. M., Angulo, C., Cabrera Caño, Jesús, Casarejos, E., Demaret, P., Borge, M. J. G., Escrig, D., Tengblad, Olof, Cherubini, S., Figuera, P., Gulino, Marisa, Freer, M., Metelko, C., Ziman, V., Raabe, R., Mukha, I., Smirnov, D., Kakuee, O. R., and Rahighi, J.

Abstract

Experimental results of the elastic scattering of 6He on 208Pb at ELAB = 22 MeV, measured at the CRC facility (Louvain-la-Neuve, Belgium), are presented, including results on the 4He production channel. These data were taken with full angular coverage and high angular resolution. Both experimental cross sections are compared with continuum discretized coupled channels and distorted-wave Born approximation calculations, where direct breakup and transfer to the continuum processes are considered. The elastic data confirm the absence of the Coulomb rainbow, while the distribution of α particles indicates that such production is mostly generated by transfer to the continuum., This work has been supported by the Spanish MICINN under projects FPA2005-04460, FPA200502379, FPA2006-13807-c02-01, FPA2007-63074, FPA2009-07653, FPA2009-07387 and FPA2010 22131-C02-01, by the Junta de Andalucia project FQM-4964, by the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042) and Programme Multi-Dark (CSD2009-00064), by the European Community-Access to Research Infrastructure action of the Improving Human Potential Program Contract, No. HPRI-CT-1999-00110, and by the Belgian Program P5/07 on interuniversity attraction poles of the Belgian-state Federal Services for Scientific, Technical and Cultural Affairs. L. Acosta acknowledges financial support by the Universidad de Huelva.

Published
2011
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16. Elastic scattering and alpha-particle production in He-6+Pb-208 collisions at 22 MeV

Author

Acosta, L., Sanchez Benitez, A. M., Gomez, M. E., Martel, I., Perez Bernal, F., Pizarro, F., Rodriguez Quintero, J., Rusek, K., Alvarez, M. A. G., Andres, M. V., Espino, J. M., Fernandez Garcia, J. P., Gomez Camacho, J., Moro, A. M., Angulo, C., Cabrera, J., Casarejos, E., Demaret, P., Borge, M. J. G., Escrig, D., Tengblad, O., Cherubini, Silvio, Figuera, P., Gulino, M., Freer, M., Metelko, C., Ziman, V., Raabe, R., Mukha, I., Smirnov, D., Kakuee, O. R., and Rahighi, J.

Published
2011

17. Breakup reaction study of the Brunnian nucleus C10 (Erratum : Phys. Rev. C 77, 021301 (2008)

Author

Curtis, N., Achouri, N.L., Ashwood, N.I., Bohlen, H.G., Catford, W.N., Clarke, N.M., Freer, M., Haigh, P.J., Laurent, B., Orr, N.A., Patterson, N.P., Soić, N., Thomas, 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2010
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19. α particle particle production in the scattering of He-6 by Pb-208 at energies around the Coulomb barrier

Author

Rusek, K., Escrig, Diego, Sánchez Benítez, Ángel Miguel|||0000-0002-5779-3502, Moro, A. M., González Álvarez, Marcos A., Andrés, M. V., Angulo, C., García Borge, María José, Cabrera Caño, Jesús, Cherubini, S., Damaret, P., Espino, José Manuel, Figuera, P., Freer, M., García Ramos, José Enrique|||0000-0001-6272-1792, Gómez Camacho, Joaquín, Gulino, Marisa, Kakuee, O. R., Martel Bravo, Ismael|||0000-0002-4895-2305, Metelko, C., Pérez Bernal, Francisco|||0000-0002-3009-3696, Rahighi, J., Smirnov, D., Tengblad, Olof, and Ziman, V.

Subjects
Breakup reactions, Scattering theory, Nuclear Theory, Halo nuclei, Física nuclear, Nuclear reactions, Nuclear Experiment
Abstract

New experimental data from the scattering of 6He + 208Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of α particles. The energy and angular distribution of this group have been analyzed and compared with theoretical calculations. This analysis indicates that the α particles emitted at backward angles in this reaction are mainly due to two-neutron transfer to weakly bound states of the final nucleus.

Published
2007

20. B(E1) strengths from Coulomb excitation of Be-11

Author

Summers, NC, Pain, SD, Orr, NA, Catford, WN, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Nunes, FM, Soic, N, Stuttge, L, Timis, CN, Thompson, IJ, Winfield, JS, and Ziman, V

Published
2007

22. 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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23. $\alpha:2n:\alpha$ molecular band in $^{10}$Be

Author

Freer, M., Casarejos, E., Achouri, L., Angulo, C., Ashwood, N. I., Curtis, N., Demaret, P., Harlin, C., Laurent, B., Milin, Matko, Orr, N. A., Price, D., Raabe, R., Soić, Neven, 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), 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
21.10Re, 25.70.-z, 27.20.+n, heavy ion-nucleus scattering, nuclei with mass number 6 to 19, resonant elastic scattering, alpha-cluster spectroscopic factor, rotational band, molecular structure, 10Be, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear rotational states
Abstract

The 10.15 MeV resonance in $^{10}$Be has been probed via resonant $^{6}$He+$^{4}$He elastic scattering. It is demonstrated that it is the J$^{p}$i=4$^{+}$ member of a rotational band built on the 6.18 MeV 0$^{+ }$state. A Gammaalpha of 0.10–0.13 MeV and Gammaalpha/Gamma=0.35–0.46 were deduced. The corresponding reduced alpha width, gammaalpha2, indicates one of the largest alpha-cluster spectroscopic factors known. The deformation of the band, including the 7.54 MeV, 2$^{+}$ member, is large ([h-bar]2/2I=200 keV). Such a deformation and the significant degree of clusterization signals a well-developed alpha:2n:alpha molecular structure.

Published
2006
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24. Cluster breakup of 18O and 22Ne

Author

Ashwood, N. I., Freer, M., Sakuta, S., Ahmed, S., Clarke, N. M., Curtis, N., McEwan, P., Metelko, C. J., Novatski, B., Soić, Neven, Stepanov D., and Ziman, V.

Subjects
cluster states, 18O, 22Ne, rotational band, transfer reaction, breakup reaction
Abstract

The 14C + α breakup of 18O has been studied at energies of Ebeam = 136 MeV and 148.5 MeV, using a 200 &micro ; ; g cm-2 thick Be target. Several states belonging to the proposed octupole deformed band, previously associated with the 8.04 MeV, 1- and 8.22 MeV, 2+ states, have been populated through inelastic excitation. A candidate for the 7- member was not found, providing evidence that the negative parity component of the band terminates at the 5- member. This is shown to be consistent with the Nilsson description of the systematics in the 16O, 18O and 20Ne nuclei. In addition, several states at Ex > 13 MeV in 18O have been measured to α -decay for the first time. The α -transfer reactions 9Be(18O, 12C 10Be)5He, 9Be(18O, 13C 9Be)5He and 9Be(18O, 18O 4He)5He were also measured ; however, little or no evidence for the population of states in 22Ne was found.

Published
2006

25. Structure of Be-12: Intruder d-wave strength at N=8

Author

Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Winfield, JS, Ziman, V, and UCL

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
2006

26. 8^Be + 14^C break-up of 22^Ne

Author

Freer, M., Ahmed, S., Ashwood, N. I., Clarke, N. M., Curtis, N., Metelko, C. J., Yildiz, S., Ziman, V. A., Soić, Neven, Novatski, B., Sakuta, S., Orr, N. A., Fulton, B. R., and Pitkin, R.

Subjects
8^Be decay, cluster structure, 22^Ne
Abstract

The 12^C(18^O, 14^C + 8^Be)8^Be reaction was studied at a beam energy of 140 MeV. Two multi-element charged-particle telescopes were used to detect the decay of 22^Ne states into 14^C + 8^Be. The reconstructed excitation energy spectrum indicates that two states at 24.14(20) and 26.89(20) MeV decay by 8^Be emission. These states may be linked to a 14^C + 2α cluster structure in 22^Ne.

Published
2006

27. 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

28. Breakup branches of Borromean beryllium-9

Author

Smith, R., primary, Freer, M., additional, Wheldon, C., additional, Curtis, N., additional, Almaraz-Calderon, S., additional, Aprahamian, A., additional, Ashwood, N. I., additional, Barr, M., additional, Bucher, B., additional, Copp, P., additional, Couder, M., additional, Fang, X., additional, Goldring, G., additional, Jung, F., additional, Kokalova, Tz., additional, Lesher, S. R., additional, Lu, W., additional, Malcolm, J. D., additional, Roberts, A., additional, Tan, W. P., additional, and Ziman, V. A., additional

Published
2015
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29. 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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30. 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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31. Resonances inC14observed in theHe4(10Be,α)Be10reaction

Author

Freer, M., primary, Malcolm, J. D., additional, Achouri, N. L., additional, Ashwood, N. I., additional, Bardayan, D. W., additional, Brown, S. M., additional, Catford, W. N., additional, Chipps, K. A., additional, Cizewski, J., additional, Curtis, N., additional, Jones, K. L., additional, Munoz-Britton, T., additional, Pain, S. D., additional, Soić, N., additional, Wheldon, C., additional, Wilson, G. L., additional, and Ziman, V. A., additional

Published
2014
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32. 12C+12C cluster resonances in 24Mg up to Ex = 50 MeV

Author

Metelko, C. J., Freer, M., Ashwood, N. I., Curtis, N., Clarke, N. M., Soić, Neven, Ziman, V. A., and Woolliscroft, R. J.

Subjects
heavy ion-nucleus reactions, nuclei with mass number 20 to 38, nuclear cluster model, deformed nuclei, nuclear resonances, Nuclear Experiment
Abstract

The population and decay of excited states in 24Mg have been investigated using the 12C(16O, 12C12C)alpha reaction at beam energies of 135 and 160 MeV . This measurement permitted the decay spectrum to be measured up to 24Mg excitation energies of 70 MeV . Resonance structures were observed up to an excitation energy of 49.4 MeV and spin J = 18[h-bar] . The results are discussed in terms of the termination of a deformed 12C+12C cluster band.

Published
2003

33. Clusters in light N-rich nuclei

Author

Ziman, V., Freer, M., Angélique, J.C., Ashwood, N.I., Axelsson, L., Benoit, B., Bergmann, U., Catford, W.N., Chappell, S.P.G., Clarke, N.M., Curtis, N., D'Arrigo, A., De Goes Brennard, E., Dorvaux, O., Fulton, B.R., Giardina, G., Greenhalgh, B., Gregori, C., Grevy, S., Hanappe, F., Kelly, G., Labiche, M., Le Brun, C., Leask, P.J., Lecouey, J.L., Leenhardt, S., Lewitowicz, M., Markenroth, K., Marqués, F.M., Murgatroyd, J.T., Nilson, T., Ninane, A., Orr, N.A., Piqueras, I., Saint-Laurent, M.G., Singer, S.M., Soic, N., Sorlin, O., Stuttge, L., Watson, D.L., 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), Lion, Michel, 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], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2003

34. Study of 24Mg resonances relevant for carbon burning nucleosynthesis

Author

Tokić, V., primary, Soić, N., additional, Blagus, S., additional, Fazinić, S., additional, Jelavić-Malenica, D., additional, Miljanić, ð., additional, Prepolec, L., additional, Skukan, N., additional, Szilner, S., additional, Uroić, M., additional, Milin, M., additional, Di Pietro, A., additional, Figuera, P., additional, Fisichella, M., additional, Lattuada, M., additional, Scuderi, V., additional, Strano, E., additional, Torresi, D., additional, Freer, M., additional, Ziman, V., additional, Martel, I., additional, Sánchez-Benítez, A. M., additional, and Acosta, L., additional

Published
2014
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35. Breakup reaction study of the Brunnian nucleus (10)C

Author

Curtis, N, Achouri, NL, Ashwood, NI, Bohlen, HG, Catford, WN, Clarke, NM, Freer, M, Haigh, PJ, Laurent, B, Orr, NA, Patterson, NP, Soic, N, Thomas, JS, Ziman, V, Curtis, N, Achouri, NL, Ashwood, NI, Bohlen, HG, Catford, WN, Clarke, NM, Freer, M, Haigh, PJ, Laurent, B, Orr, NA, Patterson, NP, Soic, N, Thomas, JS, and Ziman, V

Published
2008

36. Investigation of the 4-αlinear chain state in16O

Author

Curtis, N., primary, Almaraz-Calderon, S., additional, Aprahamian, A., additional, Ashwood, N. I., additional, Barr, M., additional, Bucher, B., additional, Copp, P., additional, Couder, M., additional, Fang, X., additional, Freer, M., additional, Goldring, G., additional, Jung, F., additional, Lesher, S. R., additional, Lu, W., additional, Malcolm, J. D., additional, Roberts, A., additional, Tan, W. P., additional, Wheldon, C., additional, and Ziman, V. A., additional

Published
2013
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37. Yield measurements for resonances above the multi-αthreshold in20Ne

Author

Kokalova, Tz., primary, Freer, M., additional, Curtis, N., additional, Ashwood, N. I., additional, Barr, M., additional, Malcolm, J. D., additional, Wheldon, C., additional, Ziman, V. A., additional, Almaraz-Calderon, S., additional, Aprahamian, A., additional, Bucher, B., additional, Couder, M., additional, Fang, X., additional, Jung, F., additional, Lu, W., additional, Roberts, A., additional, Tan, W. P., additional, Copp, P., additional, and Lesher, S. R., additional

Published
2013
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38. Study of 24Mg resonances relevant to carbon burning nucleosynthesis

Author

Tokić, V, primary, Soić, N, additional, Blagus, S, additional, Fazinić, S, additional, Jelavić-Malenica, D, additional, Miljanić, Đ, additional, Prepolec, L, additional, Skukan, N, additional, Szilner, S, additional, Uroić, M, additional, Milin, M, additional, Di Pietro, A, additional, Figuera, P, additional, Fisichella, M, additional, Lattuada, M, additional, Scuderi, V, additional, Strano, E, additional, Torresi, D, additional, Ashwood, N, additional, Curtis, N, additional, Freer, M, additional, Ziman, V, additional, Martel, I, additional, Sánchez-Benítez, A M, additional, and Acosta, L, additional

Published
2013
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39. Absolute partial decay branching-ratios in16O

Author

Wheldon, C, primary, Ashwood, N I, additional, Barr, M, additional, Curtis, N, additional, Freer, M, additional, Kokalova, Tz, additional, Malcolm, J D, additional, Spencer, S J, additional, Ziman, V A, additional, Faestermann, Th, additional, Krücken, R, additional, Wirth, H-F, additional, Hertenberger, R, additional, Lutter, R, additional, and Bergmaier, A, additional

Published
2013
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40. alpha-particle production in the scattering of He-6 by Pb-208 at energies around the Coulomb barrier

Author

UCL - SC/PHYS - Département de physique, Escrig, D., Sanchez-Benitez, A.M., Moro, A.M., Alvarez, M.A.G., Andres, M.V., Angulo, C., Borge, M.J.G., Cabrera, J., Cherubini, S., Espino, J.M., Figuera, P., Freer, M., Garcia-Ramos, J.E., Gomez-Camacho, J., Gulino, M., Kakuee, O.R., Martel, I., Metelko, C., Perez-Bernal, F., Rahighi, J., Rusek, K., Smirnov, D., Tengblad, O., Ziman, V., Demaret, Paul, UCL - SC/PHYS - Département de physique, Escrig, D., Sanchez-Benitez, A.M., Moro, A.M., Alvarez, M.A.G., Andres, M.V., Angulo, C., Borge, M.J.G., Cabrera, J., Cherubini, S., Espino, J.M., Figuera, P., Freer, M., Garcia-Ramos, J.E., Gomez-Camacho, J., Gulino, M., Kakuee, O.R., Martel, I., Metelko, C., Perez-Bernal, F., Rahighi, J., Rusek, K., Smirnov, D., Tengblad, O., Ziman, V., and Demaret, Paul

Abstract

New experimental data from the scattering of 6He+208Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of $\alpha$ particles. The energy and angular distributions of this group have been analyzed and compared with theoretical calculations. This analysis indicates that the $\alpha$ particles emitted at backward angles in this reaction are mainly due to two-neutron transfer to weakly bound states of the final nucleus. Comment: 20 pages, 5 figures. Nuclear Physics A792 (2007) 2-17

Published
2007

41. Structure of Be-12: Intruder d-wave strength at N=8

Author

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

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
2006

42. Scattering of He-6 at energies around the Coulomb barrier

Author

UCL, Sanchez-Benitez, A.M., Escrig, D., Alvarez, M.A.G., Andres, M.V., Angulo, C., Borge, M.J.G., Cabrera, J., Cherubini, S., Espino, J.M., Figuera, P., Freer, M., Garcia-Ramos, J.E., Gomez-Camacho, J., Gulino, M., Kakuee, O.R., Martel, I., Metelco, C., Moro, A.M., Rahighi, J., Rusek, K., Smirnov, D., Tengblad, O., van Duppen, P., Ziman, V., NUSTAR 05: Nuclear Structure, Astrophysics and Reactions, UCL, Sanchez-Benitez, A.M., Escrig, D., Alvarez, M.A.G., Andres, M.V., Angulo, C., Borge, M.J.G., Cabrera, J., Cherubini, S., Espino, J.M., Figuera, P., Freer, M., Garcia-Ramos, J.E., Gomez-Camacho, J., Gulino, M., Kakuee, O.R., Martel, I., Metelco, C., Moro, A.M., Rahighi, J., Rusek, K., Smirnov, D., Tengblad, O., van Duppen, P., Ziman, V., and NUSTAR 05: Nuclear Structure, Astrophysics and Reactions

Published
2005

43. Structure of Be-12: Intruder d-wave strength at N=8

Author

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

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

44. Evidence of a (1d(5/2))(2) component to the Be-12 ground state

Author

Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, B, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, R, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Ziman, V, Winfield, J, Seweryniak, D, Khoo, TL, Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, B, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, R, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Ziman, V, Winfield, J, Seweryniak, D, and Khoo, TL

Abstract

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 (2s 1 2) 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 (1p 1 2) 2 and (1d 5 2) 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
2005

46. Absolute partial decay-branch measurements in13C

Author

Wheldon, C., primary, Ashwood, N. I., additional, Barr, M., additional, Curtis, N., additional, Freer, M., additional, Kokalova, Tz., additional, Malcolm, J. D., additional, Ziman, V. A., additional, Faestermann, Th., additional, Wirth, H.-F., additional, Hertenberger, R., additional, and Lutter, R., additional

Published
2012
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47. First excited12+state in9B

Author

Baldwin, T. D., primary, Catford, W. N., additional, Mahboub, D., additional, Timis, C. N., additional, Ashwood, N. I., additional, Clarke, N. M., additional, Curtis, N., additional, Ziman, V., additional, Brown, T. A. D., additional, Fox, S. P., additional, Fulton, B. R., additional, Groombridge, D., additional, Watson, D. L., additional, Pucknell, V. F. E., additional, and Weisser, D. C., additional

Published
2012
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48. Study of states in14C via the10Be(4He,4He)10Be reaction

Author

Malcolm, J D, primary, Freer, M, additional, Ashwood, N I, additional, Curtis, N, additional, Munoz-Britton, T, additional, Wheldon, C, additional, Ziman, V A, additional, Catford, W N, additional, Brown, S, additional, Wilson, G, additional, Soic, N, additional, Bardayan, D, additional, Pain, S D, additional, Achouri, N L, additional, Chipps, K, additional, and Crzywacz-Jones, K, additional

Published
2012
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49. Does a 4-α linear chain exist in16O?

Author

Curtis, N, primary, Almaraz-Calderon, S, additional, Aprahamian, A, additional, Ashwood, N I, additional, Barr, M, additional, Bucher, B, additional, Copp, P, additional, Couder, M, additional, Fang, X, additional, Freer, M, additional, Goldring, G, additional, Jung, F, additional, Lesher, S R, additional, Lu, W, additional, Malcolm, J D, additional, Roberts, A, additional, Tan, W P, additional, Wheldon, C, additional, and Ziman, V A, additional

Published
2012
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50. Simplicity from Complexity

Author

Freer, M, primary, Almaraz-Calderon, S, additional, Carter, J, additional, Aprahamian, A, additional, Ashwood, N I, additional, Barr, M, additional, Bucher, B, additional, Copp, P, additional, Couder, M, additional, Curtis, N, additional, Fang, X, additional, Jung, F, additional, Lesher, S, additional, Lu, W, additional, Malcolm, J D, additional, Roberts, A, additional, Smit, R, additional, Tan, W P, additional, Wheldon, C, additional, and Ziman, V A, additional

Published
2012
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