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125 results on '"Moukaddam, M."'

101. High-precision half-life measurements for the superallowed Fermiβ+emitterNe18

Author

Laffoley, A. T., primary, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G. C., additional, Bender, P. C., additional, Bidaman, H., additional, Bildstein, V., additional, Blank, B., additional, Cross, D. S., additional, Deng, G., additional, Varela, A. Diaz, additional, Dunlop, M. R., additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Giovinazzo, J., additional, Grinyer, G. F., additional, Grinyer, J., additional, Hackman, G., additional, Hadinia, B., additional, Jamieson, D. S., additional, Jigmeddorj, B., additional, Kisliuk, D., additional, Leach, K. G., additional, Leslie, J. R., additional, MacLean, A. D., additional, Miller, D., additional, Mills, B., additional, Moukaddam, M., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Thomas, J. C., additional, Turko, J., additional, Unsworth, C., additional, and Voss, P., additional

Published
2015
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102. High-Precision Half-Life Measurements for the Superallowed Fermi β+ Emitters 14O and 18Ne

Author

Laffoley, A. T., primary, Andreoiu, C., additional, Austin, R. A. E., additional, Ball, G. C., additional, Bender, P. C., additional, Bidaman, H., additional, Bildstein, V., additional, Blank, B., additional, Bouzomita, H., additional, Cross, D. S., additional, Deng, G., additional, Varela, A. Diaz, additional, Dunlop, M. R., additional, Dunlop, R., additional, Finlay, P., additional, Garnsworthy, A. B., additional, Garrett, P., additional, Giovinazzo, J., additional, Grinyer, G. F., additional, Grinyer, J., additional, Hadinia, B., additional, Jamieson, D. S., additional, Jigmeddorj, B., additional, Ketelhut, S., additional, Kisliuk, D., additional, Leach, K. G., additional, Leslie, J. R., additional, MacLean, A., additional, Miller, D., additional, Mills, B., additional, Moukaddam, M., additional, Radich, A. J., additional, Rajabali, M. M., additional, Rand, E. T., additional, Svensson, C. E., additional, Tardiff, E., additional, Thomas, J. C., additional, Turko, J., additional, Voss, P., additional, and Unsworth, C., additional

Published
2015
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103. Indirect study of $^{60}$Fe(n,γ)$^{61}$Fe via the transfer reaction $^{60}$Fe(d,pγ)$^{61}$Fe

Author

Giron, S., Hammache, F., De Sereville, N., Beaumel, D., Burgunder, G., Caceres, L., Duchêne, G., Clément, E., Fernandez, B., Flavigny, F., De France, G., Franchoo, S., Galaviz-Redondo, D., Gasques, L., Gibelin, J., Gilibert, A., Grévy, S., Guillot, J., Heil, M., Kiener, J., Lapoux, V., Marechal, F., Matta, A., Matea, I., Moukaddam, M., Nalpas, L., Perrot, L., Obertelli, A., Raabe, R., Roussel, Pierre, Scarpaci, J. A., Sorlin, O., Stephan, I., Stodel, C., Takechi, M., Thomas, J.C., Togano, Y., 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), 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 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Abstract

International audience; 60Fe nuclei play an important role both in g-ray astronomy and in pre-solar grains study. Theinterpretation of these observations depends on a reliable 60Fe yield prediction. We report hereon the d(60Fe,pg)61Fe experiment performed at GANIL, aiming at studying the 60Fe(n,g)61Fereaction to reduce nuclear uncertainties surrounding 60Fe nucleosynthesis. Preliminary resultsconcerning excitation energies of 61Fe are presented.

Published
2010

104. Study of 60Fe(n,$\gamma$)61Fe reaction of astrophysical interest via d(60Fe,p$\gamma$) indirect reaction

Author

Giron, S., Hammache, F., De Séréville, N., Beaumel, D., Burgunder, G., Caceres, L., Clément, E., Duchene, G., Flavigny, F., De France, G., Franchoo, S., Fernandez, B., Galaviz-Redondo, D., Gasques, L., Gibelin, J., Gillibert, A., Grévy, S., Guillot, J., Heil, M., Kiener, J., Lapoux, V., Maréchal, F., Matta, A., Matea, Y., Moukaddam, M., Nalpas, L., Obertelli, A., Perrot, L., Raabe, R., Scarpaci, J.A., Sorlin, O., Stefan, I., Stodel, C., Takechi, M., Thomas, J.C., Togano, Y., 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), 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 Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-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, Centro de Física Nuclear da Universidade de Lisboa (CFNUL), Universidade de Lisboa = University of Lisbon (ULISBOA), 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Universidade de Lisboa (ULISBOA), 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
29.25.Rm, 26.50.+x, 26.40.+r, 25.70.Hi, Nuclear astrophysics, 60Fe, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], radioactive beam, transfer reaction
Abstract

Expérience GANIL/LISE/CATS/MUST2/EXOGAM; International audience; INTEGRAL and RHESSI spacecrafts recently detected the 1.173 and 1.333 MeV gamma-ray lines coming from the 60Fe--60Co--60Ni radioactive decay chain. The long lived isotope 60Fe (T1/2 = 1.5 106y) is believed to be primarily produced in core-collapse supernovae. However the interpretation of the observations is difficult because of the large uncertainties concerning 59Fe(n,gamma)60Fe and 60Fe(n,gamma)61Fe cross sections, involved in 60Fe nucleosynthesis.The direct component of the 60Fe(n,gamma)61Fe reaction was studied indirectly via the d(60Fe,pgamma)61Fe transfer reaction. The experiment performed in GANIL in spring 2009 will allow to determine the excitation energies of the populated excited states of 61Fe and for the first time their spectroscopic factors as well as their transfer angular momentum.I will first give an overview of the astrophysical context, then I will describe the experimental setup and finally present some preliminary results of the ongoing analysis.

Published
2009

105. Electric Monopole Transition Strengths in 62Ni.

Author

Evitts, L. J., Garnsworthy, A. B., Kibédi, T., Moukaddam, M., Alshahrani, B., Eriksen, T. K., Holt, J. D., Hota, S. S., Lane, G. J., Lee, B. Q., McCormick, B. P., Palalani, N., Reed, M. W., Stroberg, S. R., and Stuchbery, A. E.

Subjects
MAGNETIC monopoles, CHEMICAL reactions, ACYLATION, ELECTRONIC excitation, ELECTRONS
Abstract

Excited states in 62Ni were populated with a (p, p') reaction using the 14UD Pelletron accelerator at the Australian National University. Electric monopole transition strengths, ρ²(E0), were measured through simultaneous detection of the internal conversion electrons and γ rays emitted from the de-excitation of populated states, using the Super-e spectrometer coupled with a germanium detector. The strength of the 0+ to 0+1 transition has been measured to be 77+23-34 10-3 and agrees with previously reported values. Upper limits have been placed on the 0+3 to 0+1 and 0+3 to 0+2 transitions. The measured ρ²(E0) value of the 2+2 to 2+1 transition in 62Ni has been measured for the first time and found to be one of the largest ρ²(E0) values measured to date in nuclei heavier than Ca. The low-lying states of 62Ni have previously been classified as one- and two-phonon vibrational states based on level energies. The measured electric quadrupole transition strengths are consistent with this interpretation. However as electric monopole transitions are forbidden between states which differ by one phonon number, the simple harmonic quadrupole vibrational picture is not sufficient to explain the large ρ²(E0) value for the 22+2 to 22+1 transition. [ABSTRACT FROM AUTHOR]

Published
2016
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106. Nuclear structure of 122Xe studied via high-statistics β+/EC-decay.

Author

Jigmeddorj, B., Garrett, P. E., Andreoiu, C., Ball, G. C., Bruhn, T., Cross, D. S., Garnsworthy, A. B., Hackman, G., Hadinia, B., Moukaddam, M., Park, J., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Rizman, U., Svensson, C. E., Voss, P., Wang, Z. M., and Wood, J. L.

Subjects
NUCLEAR structure, RADIOACTIVE decay, NUCLEAR excitation, NUCLEAR reactions, NUCLEAR physics
Abstract

The nuclear structure of 122Xe has been investigated with measurements of the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. The data collected have enabled the determination of relative B(E2) values of some low-energy transitions, and the in-band transitions of the excited 0+ bands have been observed. As a result, the 2+ rotational band members for the 0+2 and 0+3 states have been firmly identified. [ABSTRACT FROM AUTHOR]

Published
2016
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107. New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs.

Author

Jigmeddorj, B., Garrett, P. E., Andreoiu, C., Ball, G. C., Bruhn, T., Cross, D. S., Garnsworthy, A. B., Hadinia, B., Moukaddam, M., Park, J., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Rizwan, U., Svensson, C. E., Voss, P., Wang, Z. M., Wood, J. L., and Yates, S. W.

Subjects
NUCLEAR excitation, ANGULAR momentum (Nuclear physics), PHASE transitions, NUCLEAR physics, STATISTICAL correlation
Abstract

Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8πγ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses. [ABSTRACT FROM AUTHOR]

Published
2018
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108. Lifetime measurements of states inO15

Author

Galinski, N., primary, Sjue, S. K. L., additional, Ball, G. C., additional, Cross, D. S., additional, Davids, B., additional, Al Falou, H., additional, Garnsworthy, A. B., additional, Hackman, G., additional, Hager, U., additional, Howell, D. A., additional, Jones, M., additional, Kanungo, R., additional, Kshetri, R., additional, Leach, K. G., additional, Leslie, J. R., additional, Moukaddam, M., additional, Orce, J. N., additional, Rand, E. T., additional, Ruiz, C., additional, Ruprecht, G., additional, Schumaker, M. A., additional, Svensson, C. E., additional, Triambak, S., additional, and Unsworth, C. D., additional

Published
2014
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109. Experimental Study of the Two-Body Spin-Orbit Force in Nuclei

Author

Burgunder, G., primary, Sorlin, O., additional, Nowacki, F., additional, Giron, S., additional, Hammache, F., additional, Moukaddam, M., additional, de Séréville, N., additional, Beaumel, D., additional, Càceres, L., additional, Clément, E., additional, Duchêne, G., additional, Ebran, J. P., additional, Fernandez-Dominguez, B., additional, Flavigny, F., additional, Franchoo, S., additional, Gibelin, J., additional, Gillibert, A., additional, Grévy, S., additional, Guillot, J., additional, Lepailleur, A., additional, Matea, I., additional, Matta, A., additional, Nalpas, L., additional, Obertelli, A., additional, Otsuka, T., additional, Pancin, J., additional, Poves, A., additional, Raabe, R., additional, Scarpaci, J. A., additional, Stefan, I., additional, Stodel, C., additional, Suzuki, T., additional, and Thomas, J. C., additional

Published
2014
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110. Reaction of the Halo Nucleus $^{11}$Be on Heavy Targets at Energies Around the Coulomb Barrier

Author

Pesudo, V., primary, Borge, M.J.G., additional, Moro, A.M., additional, Nacher, E., additional, Acosta, L., additional, Alcorta, M., additional, Alvarez, M.A.G., additional, Ball, G.C., additional, Bender, P.C., additional, Braid, R., additional, Cubero, M., additional, [Pietro]di Pietro, A., additional, Fernandez-Garcia, J.P., additional, Figuera, P., additional, Fisichella, M., additional, Fulton, B.R., additional, Garnsworthy, A.B., additional, Gomez-Camacho, J., additional, Hackman, G., additional, Kirsebom, O.S., additional, Kuhn, K., additional, Krüecken, R., additional, Lattuada, M., additional, Lay, J.A., additional, Marquínez-Durán, G., additional, Martel, I., additional, Miller, D., additional, Moukaddam, M., additional, O'Malley, P.D., additional, Perea, A., additional, Rajabali, M.M., additional, Sánchez-Benítez, A.M., additional, Sarazin, F., additional, Scuderi, V., additional, Svensson, C.E., additional, Tengblad, O., additional, Unsworth, C., additional, and Wang, Z.M., additional

Published
2014
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111. Acta Physica Polonica B

Author

Moukaddam, M., primary, Duchêne, G., additional, Beaumel, D., additional, Burgunder, J., additional, and Caceres, L., additional

Published
2011
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112. Study of [sup 60]Fe(n,γ)[sup 61]Fe reaction of astrophysical interest via d([sup 60]Fe,pγ) indirect reaction

Author

Giron, S., primary, Hammache, F., additional, de Séréville, N., additional, Beaumel, D., additional, Burgunder, J., additional, Caceres, L., additional, Clement, E., additional, Duchene, G., additional, Flavigny, F., additional, De France, G., additional, Franchoo, S., additional, Fernandez, B., additional, Galaviz-Redondo, D., additional, Gasques, L., additional, Gibelin, J., additional, Gillibert, A., additional, Grevy, S., additional, Guillot, J., additional, Heil, M., additional, Kiener, J., additional, Lapoux, V., additional, Maréchal, F., additional, Matta, A., additional, Matea, Y., additional, Moukaddam, M., additional, Nalpas, L., additional, Obertelli, A., additional, Perrot, L., additional, Raabe, R., additional, Scarpaci, J. A., additional, Sorlin, O., additional, Stefan, I., additional, Stoedel, C., additional, Takechi, M., additional, Thomas, J. C., additional, Togano, Y., additional, Spitaleri, Claudi, additional, Rolfs, Claus, additional, and Pizzone, Rosario G., additional

Published
2010
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113. SEARCH FOR 2d5/2 NEUTRON STATES IN 69Ni.

Author

Moukaddam, M., Duchêne, G., Beaumel, D., Burgunder, J., Caceres, L., Clement, E., Curien, D., Didierjean, F., Fernandez, B., Finck, Ch., Flavigny, F., Franchoo, S., Gibelin, J., Giron, S., Gillibert, A., Goasduff, A., Grevy, S., Guillot, J., Haas, F., and Hammache, F.

Subjects
*NICKEL isotopes, *NEUTRONS, *ATOMIC orbitals, *NUCLEAR shell theory, *QUADRUPOLES, *RADIOISOTOPES, *NUCLEAR energy, *PARTICLES (Nuclear physics)
Abstract

It has been shown that the neutron 2d5/2 orbital has to be included in shell-model calculations to explain the large quadrupole collectivity observed in the Fe and Cr of N = 40 region, probably a new island of inversion similar to the one known for light nuclei around N = 20. Indeed, in these calculations using a large valence neutron space, the position, i.e. the singleparticle energy, of the 2d5/2 orbital is a crucial ingredient. The experiment discussed in this paper aims to determine the v1g9/2-v2d5/2 gap using the neutron stripping reaction d(68Ni; p)68Ni which has been performed at GANIL in inverse kinematics. Preliminary results are presented. [ABSTRACT FROM AUTHOR]

Published
2011
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114. Study of the scattering of the halo nucleus11Be on a197Au target at energies around the Coulomb barrier

Author

Borget, M. J. G., Pesudo, V., Nácher, E., Tengblad, O., Cubero, M., Perea, A., Antonio Moro, Lay, J. A., Gómez-Camacho, J., Alvarez, M. A. G., Fernández-García, J. P., Di Prieto, A., Figuera, P. P., Fisichella, M., Lattuada, M., Scuderi, V., Marquínez-Durán, G., Martel, I., Sánchez-Benítez, A. M., Alcorta, M., Bender, P. C., Braid, R., Garnsworthy, A. B., Hackman, G., Miller, D., Moukaddam, M., Rajabali, M. M., Unsworth, C., Wang, Z. M., Fulton, B. R., Hager, U., Kirsebom, O. S., Kuhn, K., O Malley, P. D., Sarazin, F., and Svensson, C. E.

116. Study of the scattering of the halo nucleus 11 Be on a 197 Au target at energies around the Coulomb barrier

Author

Borget, M. J. G., Pesudo, V., Nácher, E., Tengblad, O., Cubero, M., Perea, A., Moro, A. M., Lay, J. A., Gómez-Camacho, J., Alvarez, M. A. G., Juan Pablo Fernández-García, Di Prieto, A., Figuera, P. P., Fisichella, M., Lattuada, M., Scuderi, V., Marquínez-Durán, G., Martel, I., Sánchez-Benítez, A. M., Alcorta, M., Bender, P. C., Braid, R., Garnsworthy, A. B., Hackman, G., Miller, D., Moukaddam, M., Rajabali, M. M., Unsworth, C., Wang, Z. M., Fulton, B. R., Hager, U., Kirsebom, O. S., Kuhn, K., O Malley, P. D., Sarazin, F., and Svensson, C. E.

117. Indirect study of 60Fe(n,γ)61Fe via the transfer reaction d(60Fe,pγ) 61Fe

Author

Giron, S., Hammache, F., Séréville, N., Beaumel, D., Burgunder, J., Caceres, L., Duchêne, G., Emmanuel Clement, Fernandez, B., Flavigny, F., France, G., Franchoo, S., Galaviz-Redondo, D., Gasques, L., Gibelin, J., Gillibert, A., Grevy, S., Guillot, J., Heil, M., Kiener, J., Lapoux, V., Maréchal, F., Matta, A., Matea, I., Moukaddam, M., Nalpas, L., Perrot, L., Obertelli, A., Raabe, R., Roussel, P., Scarpaci, J. A., Sorlin, O., Stefan, I., Stoedel, C., Takechi, M., Thomas, J. C., and Togano, Y.

118. Study of the scattering of the halo nucleus 11Be on a 197Au target at energies around the Coulomb barrier

Author

Borget, M. J. G., Pesudo, V., Nácher, E., Tengblad, O., Cubero, M., Perea, A., Moro, A. M., Lay, J. A., Gómez-Camacho, J., Alvarez, M. A. G., Fernández-García, J. P., Di Prieto, A., Figuera, P. P., Fisichella, M., Lattuada, M., Scuderi, V., Marquínez-Durán, G., Martel, I., Sánchez-Benítez, A. M., Alcorta, M., Bender, P. C., Braid, R., Garnsworthy, A. B., Hackman, G., Miller, D., Moukaddam, M., Rajabali, M. M., Unsworth, C., Wang, Z. M., Fulton, B. R., Hager, U., Kirsebom, O. S., Kuhn, K., O Malley, P. D., Frederic Sarazin, and Svensson, C. E.

119. E0 transition strengths in 110Pd.

Author

Smallcombe, J., Berean-Dutcher, J., Moukaddam, M., Garnsworthy, A. B., Andreoiu, C., Caballero-Folch, R., Drake, T. E., Evitts, L. J., Hackman, G., Henderson, J., Kurkjian, A., Olaizola, B., Peters, E. E., Southall, D., Ruotsalainen, P., Svensson, C. E., Wiens, M., Yates, S. W., and Zidar, T.

Subjects
TRANSITION strengths, INELASTIC scattering, GAMMA rays, INTERNAL conversion (Nuclear physics), ELECTRONS
Abstract

Internal conversion coefficients have been measured for transitions in 110Pd to allow the determination of electric monopole (E0) transition strengths. Excited states were populated through inelastic alpha scattering and the SPICE+TIGRESS detectors at TRIUMF-ISAC-II were used to detect the emitted gamma rays and internal conversion electrons. The E0 transition strengths are found to be small and are consistent with the expectation for transitions from a K = 2 band to the K = 0 ground-state band in the axial rotor model. [ABSTRACT FROM AUTHOR]

Published
2018
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120. Identification of significant E0 strength in the [formula omitted] transitions of 58,60,62Ni.

Author

Garnsworthy, A.B., Smallcombe, J., Holt, J.D., Moukaddam, M., Stroberg, S.R., Evitts, L.J., Kibédi, T., Reed, M.W., Stuchbery, A.E., Lane, G.J., Eriksen, T.K., Akber, A., de Vries, M., Gerathy, M.S.M., Lee, B.Q., McCormick, B.P., Mitchell, A.J., Palalani, N., Palazzo, T., and Tornyi, T.

Subjects
*NUCLEAR structure, *INTERNAL conversion (Nuclear physics), *PROTON scattering, *NEUTRON scattering
Abstract

The E 0 transition strength in the 2 2 + → 2 1 + transitions of 58,60,62 Ni have been determined for the first time following a series of measurements at the Australian National University (ANU) and the University of Kentucky (UK). The CAESAR Compton-suppressed HPGe array and the Super-e solenoid at ANU were used to measure the δ ( E 2 / M 1 ) mixing ratio and internal conversion coefficient of each transition following inelastic proton scattering. Level half-lives, δ ( E 2 / M 1 ) mixing ratios and γ -ray branching ratios were measured at UK following inelastic neutron scattering. The new spectroscopic information was used to determine the E 0 strengths. These are the first 2 + → 2 + E 0 transition strengths measured in nuclei with spherical ground states and the E 0 component is found to be unexpectedly large; in fact, these are amongst the largest E 0 transition strengths in medium and heavy nuclei reported to date. [ABSTRACT FROM AUTHOR]

Published
2018
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121. Lifetime measurements of states in 15O.

Author

Galinski, N., Sjue, S. K. L., Ball, G. C., Cross, D. S., Davids, B., Al Falou, H., Gamsworthy, A. B., Hackman, G., Hager, U., Howell, D. A., Jones, M., Kanungo, R., Kshetri, R., Leach, K. G., Leslie, J. R., Moukaddam, M., Orce, J. N., Rand, E. T., Ruiz, C., and Ruprecht, G.

Subjects
*RESONANCE, *DOPPLER effect, *ATTENUATION (Physics), *OBSERVED confidence levels (Statistics), *OSCILLATIONS
Abstract

At low stellar temperatures the energy release due to the CN cycle is regulated by its slowest reaction 14N(p,γ)15O, the rate of which strongly depends on the subthreshold resonance at Ec.m. = -504 keV, which corresponds to the 6.79 MeV state in 15O. By using the Doppler-shift attenuation method and the ³He(16O,α)15O reaction to populate the state, we obtained an upper limit on the lifetime of this state of τ < 1.8 fs [68.3% confidence level (C.L.)]. In addition we measured the lifetimes of the 6.18 and 6.86 MeV states to be τ < 2.5 and τ = 13.3-1.2+0.9 fs, respectively (68.3% C.L.), in good agreement with the literature. [ABSTRACT FROM AUTHOR]

Published
2014
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122. Lifetimes of low-lying excited states in 8636Kr50.

Author

Henderson, J., Chester, A., Ball, G. C., Caballero-Folch, R., Domingo, T., Drake, T. E., Evitts, L. J., Garnsworthy, A. B., Hackman, G., Hallam, S., Moukaddam, M., Ruotsalainen, P., Smallcombe, J., Smith, J. K., Starosta, K., Svensson, C. E., and Williams, J.

Subjects
*ISOBARIC spin, *NICKEL isotopes, *NUCLEAR physics
Abstract

Background: The evolution of nuclear magic numbers at extremes of isospin is a topic at the forefront of contemporary nuclear physics. N=50 is a prime example, with increasing experimental data coming to light on potentially doubly magic 100Sn and 78Ni at the proton-rich and proton-deficient extremes, respectively; however, experimental discrepancies exist in the data for less exotic systems. Purpose: In 86Kr the B(E2;2+1→0+1) value--a key indicator of shell evolution--has been experimentally determined by two different methodologies, with the results deviating by 3σ. Here, we report on a new high-precision measurement of this value, as well as the first measured lifetimes and hence transition strengths for the 2+2 and 3-(2) states in the nucleus. Methods: The Doppler-shift attenuation method was implemented using the TRIUMF-ISAC γ-ray escape-suppressed spectrometer (TIGRESS) γ-ray spectrometer and the TIGRESS integrated plunger device. High-statistics Monte Carlo simulations were utilized to extract lifetimes in accordance with state-of-the-art methodologies. Results: Lifetimes of τ(2+1)=336±4(stat.)±20(sys.) fs, τ(2+2)=263±9(stat.)±19(sys.) fs, and τ(3-(2))=73±6(stat.)±32(sys.) fs were extracted. This yields a transition strength for the first-excited state of B(E2;2+1→0+1)=259±3(stat.)±16(sys.) e² fm4. Conclusions: The measured lifetime disagrees with the previous Doppler-shift attenuation method measurement by more than 3σ, while agreeing well with a previous value extracted from Coulomb excitation. The newly extracted B(E2;2+1→0+1) value indicates a more significant reduction in the N=50 isotones approaching Z=40. [ABSTRACT FROM AUTHOR]

Published
2018
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123. High-precision half-life determination for 21Na using a 4π gas-proportional counter.

Author

Finlay, P., Laffoley, A. T., Ball, G. C., Bender, P. C., Dunlop, M. R., Dunlop, R., Hackman, G., Leslie, J. R., MacLean, A. D., Miller, D., Moukaddam, M., Olaizola, B., Severijns, N., Smith, J. K., Southall, D., and Svensson, C. E.

Subjects
*ISOBARIC spin, *SODIUM compounds, *NEON
Abstract

A high-precision half-life measurement for the superallowed β+ transition between the isospin T=1/2 mirror nuclei 21Na and 21Ne has been performed at the TRIUMF-ISAC radioactive ion beam facility yielding T1/2=22.4506(33) s, a result that is a factor of 4 more precise than the previous world-average half-life for 21Na and represents the single most precisely determined half-life for a transition between mirror nuclei to date. The contribution to the uncertainty in the 21Na Ftmirror value due to the half-life is now reduced to the level of the nuclear-structure-dependent theoretical corrections, leaving the branching ratio as the dominant experimental uncertainty. [ABSTRACT FROM AUTHOR]

Published
2017
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124. Recoil distance method lifetime measurement of the 21+ state in 94Sr and implications for the structure of neutron-rich Sr isotopes.

Author

Chester, A., Ball, G. C., Caballero-Folch, R., Cross, D. S., Cruz, S., Domingo, T., Drake, T. E., Garnsworthy, A. B., Hackman, G., Hallam, S., Henderson, J., Henderson, R., Korten, W., Krücken, R., Moukaddam, M., Olaizola, B., Ruotsalainen, P., Smallcombe, J., Starosta, K., and Svensson, C. E.

Subjects
*COULOMB friction, *NEUTRONS, *STRONTIUM isotopes
Abstract

A high precision lifetime measurement of the 21+ state in 94Sr was performed at TRIUMF's ISAC-II facility by coupling the recoil distance method implemented via the TIGRESS integrated plunger with unsafe Coulomb excitation in inverse kinematics. Due to limited statistics imposed by the use of a radioactive 94Sr beam, a likelihood ratio χ² method was derived and used to compare experimental data to Geant4 simulations. The B(E2; 21+ → 01+) value extracted from the lifetime measurement of 7.80-0.4+00.50 (stat.) ± 0.07 (sys.) ps is approximately 25% larger than previously reported while the relative error has been reduced by a factor of approximately 8. A baseline deformation has been established for Sr isotopes with N ≤ 58 which is a necessary condition for the quantum phase transition interpretation of the onset of deformation in this region. A comparison to existing theoretical models is presented. [ABSTRACT FROM AUTHOR]

Published
2017
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125. Scattering of the Halo Nucleus ^{11}Be on ^{197}Au at Energies around the Coulomb Barrier.

Author

Pesudo V, Borge MJG, Moro AM, Lay JA, Nácher E, Gómez-Camacho J, Tengblad O, Acosta L, Alcorta M, Alvarez MAG, Andreoiu C, Bender PC, Braid R, Cubero M, Di Pietro A, Fernández-García JP, Figuera P, Fisichella M, Fulton BR, Garnsworthy AB, Hackman G, Hager U, Kirsebom OS, Kuhn K, Lattuada M, Marquínez-Durán G, Martel I, Miller D, Moukaddam M, O'Malley PD, Perea A, Rajabali MM, Sánchez-Benítez AM, Sarazin F, Scuderi V, Svensson CE, Unsworth C, and Wang ZM

Abstract

Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^{11}Be on ^{197}Au were measured at energies below (E&#95;{lab}=31.9  MeV) and around (39.6 MeV) the Coulomb barrier. These three channels were unambiguously separated for the first time for reactions of ^{11}Be on a high-Z target at low energies. The experiment was performed at TRIUMF (Vancouver, Canada). The differential cross sections were compared with three different calculations: semiclassical, inert-core continuum-coupled-channels and continuum-coupled-channels ones with including core deformation. These results show conclusively that the elastic and inelastic differential cross sections can only be accounted for if core-excited admixtures are taken into account. The cross sections for these channels strongly depend on the B(E1) distribution in ^{11}Be, and the reaction mechanism is sensitive to the entanglement of core and halo degrees of freedom in ^{11}Be.

Published
2017
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