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493 results on '"Sarantites, D. G."'

1. E2 Rotational Invariants of $0^+_1$ and $2^+_1$ states for $^{106}$Cd: the Emergence of Collective Rotation

Author

Gray, T. J., Allmond, J. M., Janssens, R. V. F., Korten, W., Stuchbery, A. E., Wood, J. L., Ayangeakaa, A. D., Bottoni, S., Bucher, B. M., Campbell, C. M., Carpenter, M. P., Crawford, H. L., David, H., Doherty, D., Fallon, P., Febbraro, M. T., Galindo-Uribarri, A., Gross, C. J., Komorowska, M., Kondev, F. G., Lauritsen, T., Macchiavelli, A. O., Napiorkowsi, P., Padilla-Rodal, E., Pain, S. D., Reviol, W., Sarantites, D. G., Savard, G., Seweryniak, D., Wu, C. Y., Yu, C. -H., and Zhu, S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The collective structure of $^{106}$Cd is elucidated by multi-step Coulomb excitation of a 3.849 MeV/$A$ beam of $^{106}$Cd on a 1.1 mg/cm$^2$ $^{208}$Pb target using GRETINA-CHICO2 at ATLAS. Fourteen $E2$ matrix elements were obtained. The nucleus $^{106}$Cd is a prime example of emergent collectivity that possesses a simple structure: it is free of complexity caused by shape coexistence and has a small, but collectively active number of valence nucleons. This work follows in a long and currently active quest to answer the fundamental question of the origin of nuclear collectivity and deformation, notably in the cadmium isotopes. The results are discussed in terms of phenomenological models, the shell model, and Kumar-Cline sums of $E2$ matrix elements. The ${\langle 0_2^+ ||E2||2_1^+ \rangle}$ matrix element is determined for the first time, providing a total, converged measure of the electric quadrupole strength, $\langle Q^2 \rangle$, of the first-excited $2_1^+$ level relative to the $0_1^+$ ground state, which does not show an increase as expected of harmonic and anharmonic vibrations. Strong evidence for triaxial shapes in weakly collective nuclei is indicated; collective vibrations are excluded. This is contrary to the only other cadmium result of this kind in $^{114}$Cd by C. Fahlander et al., Nucl. Phys. A485, 327 (1988), which is complicated by low-lying shape coexistence near midshell., Comment: 7 pages, 4 figures

Published
2022
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2. Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of $^{56}$Fe

Author

Jones, M. D., Macchiavelli, A. O., Wiedeking, M., Bernstein, L. A., Crawford, H. L., Campbell, C. M., Clark, R. M., Cromaz, M., Fallon, P., Lee, I. Y., Salathe, M., Wiens, A., Ayangeakaa, A. D., Bleuel, D. L., Bottoni, S., Carpenter, M. P., Davids, H. M., Elson, J., Görgen, A., Guttormsen, M., Janssens, R. V. F., Kinnison, J. E., Kirsch, L., Larsen, A. C., Lauritsen, T., Reviol, W., Sarantites, D. G., Siem, S., Voinov, A. V., and Zhu, S.

Subjects
Nuclear Experiment
Abstract

A model-independent technique was used to determine the $\gamma$-ray Strength Function ($\gamma$SF) of $^{56}$Fe down to $\gamma$-ray energies less than 1 MeV for the first time with GRETINA using the $(p,p')$ reaction at 16 MeV. No difference was observed in the energy dependence of the $\gamma$SF built on $2^{+}$ and $4^{+}$ final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. The polarization results show a small bias towards magnetic character in the region of the enhancement.

Published
2018
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3. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

Russotto, P., Gannon, S., Kupny, S., Lasko, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Fèvre, A. Le, Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Lukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawlowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Nuclear Experiment
Abstract

Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, was used for complementary measurements of the isotopic composition and flows of light charged particles. From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value \gamma = 0.72 \pm 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation., Comment: 25 pages, 22 figures, accepted for publication in Physical Review C

Published
2016
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4. High-spin transition quadrupole moments in neutron-rich Mo and Ru nuclei: testing $\gamma $ softness?

Author

Snyder, J. B., Reviol, W., Sarantites, D. G., Afanasjev, A. V., Janssens, R. V. F., Abusara, H., Carpenter, M. P., Chen, X., Chiara, C. J., Greene, J. P., Lauritsen, T., McCutchan, E. A., Seweryniak, D., and Zhu, S.

Subjects
Nuclear Experiment
Abstract

The transition quadrupole moments, $Q_{t}$, of rotational bands in the neutron-rich, even-mass $^{102-108}$Mo and $^{108-112}$Ru nuclei were measured in the 8 to 16 $\hbar $ spin range with the Doppler-shift attenuation method. The nuclei were populated as fission fragments from $^{252}$Cf fission. The detector setup consisted of the Gammasphere spectrometer and the HERCULES fast-plastic array. At moderate spin, the $Q_{t}$ moments are found to be reduced with respect to the values near the ground states. Attempts to describe the observations in mean-field-based models, specifically cranked relativistic Hartree-Bogoliubov theory, illustrate the challenge theory faces and the difficulty to infer information on $\gamma $ softness and triaxiality from the data., Comment: 17 pages, 4 figures

Published
2013
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5. Evidence for Shape Co-existence at medium spin in 76Rb

Author

Wadsworth, R., Ragnarsson, I., Carlsson, B. G., Ma, Hai-Liang, Davies, P. J., Andreoiu, C., Austin, R. A. E., Carpenter, M. P., Dashdorj, D., Freeman, S. J., Garrett, P. E., Greene, J., Görgen, A., Jenkins, D. G., Johnston-Theasby, F., Joshi, P., Macchiavelli, A. O., Moore, F., Mukherjee, G., Reviol, W., Sarantites, D. G., Seweryniak, D., Svensson, C. E., and Valiente-Dobón, J. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Four previously known rotational bands in 76Rb have been extended to moderate spins using the Gammasphere and Microball gamma ray and charged particle detector arrays and the 40Ca(40Ca,3pn) reaction at a beam energy of 165 MeV. The properties of two of the negative-parity bands can only readily be interpreted in terms of the highly successful Cranked Nilsson-Strutinsky model calculations if they have the same configuration in terms of the number of g9/2 particles, but they result from different nuclear shapes (one near-oblate and the other near-prolate). These data appear to constitute a unique example of shape co-existing structures at medium spins., Comment: Accepted for publication in Physics Letters B

Published
2011
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6. Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State

Author

Famiano, M. A., Liu, T., Lynch, W. G., Mocko, M., Rogers, A. M., Tsang, M. B., Wallace, M. S., Charity, R. J., Komarov, S., Sarantites, D. G., Sobotka, L. G., and Verde, G.

Subjects
Nuclear Experiment
Abstract

Recent measurements of pre-equilibrium neutron and proton transverse emission from (112,124)Sn+(112,124)Sn reactions at 50 MeV/A have been completed at the National Superconducting Cyclotron Laboratory. Free nucleon transverse emission ratios are compared to those of A=3 mirror nuclei. Comparisons are made to BUU transport calculations and conclusions concerning the density dependence of the asymmetry term of the nuclear equation-of-state at sub-nuclear densities are made. The double-ratio of neutron-proton ratios between two reactions is employed as a means of reducing first-order Coulomb effects and detector efficiency effects. Comparison to BUU model predictions indicate a density dependence of the asymmetry energy that is closer to a form in which the asymmety energy increases as the square root of the density for the density region studied. A coalescent-invariant analysis is introduced as a means of reducing suggested difficulties with cluster emission in total nucleon emission. Future experimentation is presented.

Published
2006
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7. Global Lifetime Measurements of Highly-Deformed and Other Rotational Structures in the A~135 Light Rare-Earth Region: Probing the Single-Particle Motion in a Rotating Potential

Author

Riley, M. A., Laird, R. W., Kondev, F. G., Hartley, D. J., Archer, D. E., Brown, T. B., Clark, R. M., evlin, M. D, Fallon, P., Hibbert, I. M., Joss, D. T., LaFosse, D. R., Nolan, P. J., O'Brien, N. J., Paul, E. S., Pfohl, J., Sarantites, D. G., Sheline, R. K., Shepherd, S. L., Simpson, J., Wadsworth, R., Matev, M. T., Afanasjev, A. V., Dobaczewski, J., Lalazissis, G. A., Nazarewicz, W., and Satula, W.

Subjects
Nuclear Experiment
Abstract

It has been possible, using GAMMASPHERE plus Microball,to extract differential lifetime measurements free from common systematic errors for over 15 different nuclei (various isotopes of Ce, Pr, Nd, Pm, and Sm) at high spin within a single experiment. This comprehensive study establishes the effective single-particle quadrupole moments in the A~135 light rare-earth region. Detailed comparisons are made with calculations using the self-consistent cranked mean-field theory., Comment: 14 pages, 3 postscript figures. "High Spin Physics 2001" Warsaw, Poland, February 6--10, 2001, Acta Physica Polonica (in press)

Published
2001

8. Fast Rotation of the N=Z Nucleus 36Ar

Author

Svensson, C. E., Macchiavelli, A. O., Juodagalvis, A., Poves, A., Ragnarsson, I., Aberg, S., Appelbe, D. E., Austin, R. A. E., Baktash, C., Ball, G. C., Carpenter, M. P., Caurier, E., Clark, R. M., Cromaz, M., Deleplanque, M. A., Diamond, R. M., Fallon, P., Furlotti, M., Galindo-Uribarri, A., Janssens, R. V. F., Lane, G. J., Lee, I. Y., Lipoglavsek, M., Nowacki, F., Paul, S. D., Radford, D. C., Sarantites, D. G., Seweryniak, D., Stephens, F. S., Tomov, V., Vetter, K., Ward, D., and Yu, C. H.

Subjects
Nuclear Theory
Abstract

A highly-deformed rotational band has been identified in the N=Z nucleus 36Ar. At high spin the band is observed to its presumed termination at I=16+, while at low spin it has been firmly linked to previously known states in 36Ar. Spins, parities, and absolute excitation energies have thus been determined throughout the band. Lifetime measurements establish a large low-spin quadrupole deformation (beta_2=0.46+-0.03) and indicate a decreasing collectivity as the band termination is approached. With effectively complete spectroscopic information and a valence space large enough for significant collectivity to develop, yet small enough to be meaningfully approached from the shell model perspective, this rotational band in 36Ar provides many exciting opportunities to test and compare complementary models of collective motion in nuclei., Comment: Invited talk at "High Spin Physics 2001", see http://www.fuw.edu.pl/~hs2001/, to be published in Acta Physica Polonica B

Published
2001

9. The A~130 Highly-Deformed Region: New Results and Global Differential Lifetime Measurements

Author

Riley, M. A., Kondev, F. G., Laird, R. W., Pfohl, J., Archer, D. E., Brown, T. B., Clark, R. M., Devlin, M., Fallon, P., Hartley, D. J., Hibbert, I. M., Joss, D. T., LaFosse, D. R., Lerma, F., Nolan, P. J., O’Brien, N. J., Paul, E. S., Sarantites, D. G., Sheline, R. K., Shepherd, S. L., Simpson, J., Wadsworth, R., Smit, F. D., editor, Lindsay, R., editor, and Förtsch, S. V., editor

Published
1999
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15. Low-, medium-, and high-spin states in the N=Z+1 nucleus 63Ga

Author

Rudolph, D., Ragnarsson, I., Clark, R. M., Andreoiu, C., Carpenter, M. P., Ekman, J., Fahlander, C., Kondev, F. G., Lauritsen, T., Sarantites, D. G., Seweryniak, D., and Svensson, C. E.

Subjects
N=Z nuclei, gamma-ray spectroscopy, Nuclear Theory, Subatomic Physics, Nuclear Experiment, nuclear structure and decays
Abstract

The fusion-evaporation reaction 28Si+40Ca at 122 MeV beam energy was used to populate excited states in the N=Z+1 nucleus 63Ga. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array, the level scheme of 63Ga was extended by more than a factor of two in terms of number of γ-ray transitions and excited states, excitation energy (Ex>30 MeV), and angular momentum (I>30 ℏ). Nine regular sequences of states were newly established in the high-spin part of the level scheme. The majority of these rotational band structures could be connected to the previously known part of the level scheme by high-energy γ-ray transitions in the energy range Eγ=4–6 MeV. Low-spin states were assessed by shell-model calculations. The high-spin rotational bands were interpreted and classified by means of cranked Nilsson-Strutinsky calculations.

Published
2021

16. Experimental and shell-model study of excited states in Fe-55(26)29 and related notes on Cu-55(29)26

Author

Rudolph, D., Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Ekman, Jörgen, Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., and Seweryniak, D.

Subjects
Nuclear Theory, Physical Sciences, Fysik, Nuclear Experiment
Abstract

The fusion-evaporation reaction S-32+Si-28 at 125-MeV beam energy was used to populate excited states in Fe-55. Combining the Gammasphere spectrometer with ancillary devices including the Microball CsI(Tl) array and a shell of neutron detectors, a comprehensive level scheme could be derived. The experimental results are compared with theoretical results from shell-model calculations. Taking into account isospin-symmetry breaking terms is found to considerably improve the shell-model description for Fe-55. This motivated a predictive case study of near-yrast states in the mirror nucleus Cu-55.

Published
2021

18. Low-, medium-, and high-spin states in the N=Z+1 nucleus Ga63

Author

Rudolph, D., primary, Ragnarsson, I., additional, Clark, R. M., additional, Andreoiu, C., additional, Carpenter, M. P., additional, Ekman, J., additional, Fahlander, C., additional, Kondev, F. G., additional, Lauritsen, T., additional, Sarantites, D. G., additional, Seweryniak, D., additional, and Svensson, C. E., additional

Published
2021
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19. Single-particle and collective excitations in the N=28 isotones 54Fe and 53Mn

Author

Rudolph, D., Ragnarsson, I., Andreoiu, C., Bentley, M. A., Carpenter, M.P., Charity, R. J., Clark, R. M., Ekman, J., Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., and Seweryniak, D.

Subjects
Rotational bands, Nuclear Theory, Subatomic Physics, Shell model calculations, Nuclear structure, Gamma-ray spectroscopy, Nuclear Experiment
Abstract

The fusion-evaporation reaction 32S + 28Si at 125 MeV beam energy was used to populate high-spin states in the semimagic N = 28 nuclei 53Mn and 54Fe. With a combination of the Gammasphere spectrometer and ancillary devices including the Microball CsI(Tl) array, extensive high-spin level schemes are derived. They exhibit rotational-like collective structures and competing single-particle excitations. The experimental results are compared with predictions from shell-model calculations, for which the inclusion of isopin-symmetry-breaking terms is found to improve the description. An interpretation of the high-spin states is put forward using cranked Nilsson-Strutinsky calculations, indicative of contributions from collective excitations beyond some 8-MeV excitation energy and highlighting the importance of the g9/2 intruder orbital in this energy range.

Published
2020

20. Onset of high-spin rotational bands in the N=Z nucleus 62Ga

Author

Rudolph, D., Ragnarsson, I., Åberg, S., Andreoiu, C., Carpenter, M. P., Clark, R. M., Ekman, J., Fahlander, C., Janssens, R. V. F., Kondev, F G, Lauritsen, T, Sarantites, D. G., Seweryniak, D., and Svensson, C. E.

Subjects
N=Z nuclei, gamma-ray spectroscopy, Nuclear Theory, Subatomic Physics, Nuclear Experiment, nuclear structure and decays
Abstract

The fusion-evaporation reaction 28Si + 40Ca at 122 MeV beam energy was used to populate high-spin states in the odd-odd N = Z nucleus 62Ga. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array the decay scheme of 62Ga was extended beyond 10 MeV excitation energy. The onset of band structures was observed. These high-spin rotational states are interpreted and classified by means of cranked Nilsson-Strutinsky calculations.

Published
2020

21. Single-particle and collective excitations in the N=28 isotones Fe54 and Mn53

Author

Rudolph, D., Ragnarsson, I, Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Ekman, Jörgen, Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., and Seweryniak, D.

Subjects
Subatomär fysik, Particle and Plasma Physics, Nuclear Theory, Subatomic Physics, Molecular, Nuclear, Nuclear Experiment, Atomic, Nuclear & Particles Physics
Abstract

The fusion-evaporation reaction S-32+Si-28 at 125 MeV beam energy was used to populate high-spin states in the semimagic N = 28 nuclei Mn-53 and Fe-54. With a combination of the Gammasphere spectrometer and ancillary devices including the Microball CsI(Tl) array, extensive high-spin level schemes are derived. They exhibit rotational-like collective structures and competing single-particle excitations. The experimental results are compared with predictions from shell-model calculations, for which the inclusion of isopin-symmetry-breaking terms is found to improve the description. An interpretation of the high-spin states is put forward using cranked Nilsson-Strutinsky calculations, indicative of contributions from collective excitations beyond some 8-MeV excitation energy and highlighting the importance of the g(9/2) intruder orbital in this energy range.

Published
2020

22. Onset of high-spin rotational bands in the N = Z nucleus Ga-62

Author

Rudolph, D., Ragnarsson, I, Åberg, S., Andreoiu, C., Carpenter, M. P., Clark, R. M., Ekman, Jörgen, Fahlander, C., Janssens, R. V. F., Kondev, F. G., Lauritsen, T., Sarantites, D. G., Seweryniak, D., and Svensson, C. E.

Subjects
Subatomär fysik, Nuclear Theory, Subatomic Physics, Nuclear Experiment
Abstract

The fusion-evaporation reaction Si-28 + Ca-40 at 122 MeV beam energy was used to populate high-spin states in the odd-odd N = Z nucleus Ga-62. With the combination of the Gammasphere spectrometer and the Microball CsI(Tl) charged-particle detector array the decay scheme of Ga-62 was extended beyond 10 MeV excitation energy. The onset of band structures was observed. These high-spin rotational states are interpreted and classified by means of cranked Nilsson-Strutinsky calculations.

Published
2020

23. Gamma-ray spectroscopy of the doubly magic nucleus 56Ni

Author

Johansson, E. K., Rudolph, D., Ekman, J., Fahlander, C., Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Fallon, P., Janssens, R. V. F., Kondev, F. G., Khoo, T. L., Lauritsen, T., Macchiavelli, A. O., Reviol, W., Sarantites, D. G., Seweryniak, D., Svensson, C. E., and Williams, S. J.

Published
2006
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24. Single-particle and collective excitations in the N=28 isotones Fe-54 and Mn-53

Author

Rudolph, D., Ragnarsson, I, Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Ekman, Jörgen, Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., Seweryniak, D., Rudolph, D., Ragnarsson, I, Andreoiu, C., Bentley, M. A., Carpenter, M. P., Charity, R. J., Clark, R. M., Ekman, Jörgen, Fahlander, C., Fallon, P., Reviol, W., Sarantites, D. G., and Seweryniak, D.

Abstract

The fusion-evaporation reaction S-32+Si-28 at 125 MeV beam energy was used to populate high-spin states in the semimagic N = 28 nuclei Mn-53 and Fe-54. With a combination of the Gammasphere spectrometer and ancillary devices including the Microball CsI(Tl) array, extensive high-spin level schemes are derived. They exhibit rotational-like collective structures and competing single-particle excitations. The experimental results are compared with predictions from shell-model calculations, for which the inclusion of isopin-symmetry-breaking terms is found to improve the description. An interpretation of the high-spin states is put forward using cranked Nilsson-Strutinsky calculations, indicative of contributions from collective excitations beyond some 8-MeV excitation energy and highlighting the importance of the g(9/2) intruder orbital in this energy range.

Published
2020
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26. Single-particle and collective excitations in the N=28 isotones Fe54 and Mn53

Author

Rudolph, D., primary, Ragnarsson, I., additional, Andreoiu, C., additional, Bentley, M. A., additional, Carpenter, M. P., additional, Charity, R. J., additional, Clark, R. M., additional, Ekman, J., additional, Fahlander, C., additional, Fallon, P., additional, Reviol, W., additional, Sarantites, D. G., additional, and Seweryniak, D., additional

Published
2020
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27. Onset of high-spin rotational bands in the N=Z nucleus Ga62

Author

Rudolph, D., primary, Ragnarsson, I., additional, Åberg, S., additional, Andreoiu, C., additional, Carpenter, M. P., additional, Clark, R. M., additional, Ekman, J., additional, Fahlander, C., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Sarantites, D. G., additional, Seweryniak, D., additional, and Svensson, C. E., additional

Published
2020
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28. Decay of 160Er* in 16O + 144Nd and 64Ni + 96Zr Fusion Reactions

Author

Nicolis, N. G., primary, Barreto, J. L., additional, Sarantites, D. G., additional, Charity, R. J., additional, Sobotka, L. G., additional, Stracener, D. W., additional, Hensley, D. C., additional, Beene, J. R., additional, Baktash, C., additional, Halbert, M. L., additional, and Thoennessen, M., additional

Published
2019
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29. Low-spin structure of the N=82 nucleus Cs 137

Author

Reviol, W., Sarantites, D. G., Elson, J. M., Kinnison, J. E., Gargano, A., Janssens, R. V. F., Allmond, J. M., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., David, H. M., Galindo-Uribarri, A., Itaco, N., Lauritsen, T., Padilla-Rodal, E., Zhu, S., Reviol, W., Sarantites, D. G., Elson, J. M., Kinnison, J. E., Gargano, A., Janssens, R. V. F., Allmond, J. M., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., David, H. M., Galindo-Uribarri, A., Itaco, N., Lauritsen, T., Padilla-Rodal, E., and Zhu, S.

Subjects
Nuclear and High Energy Physics
Abstract

Excited states in Cs137 have been studied by using the near-barrier, single-proton transfer reaction B10(Xe136,Be9γ)Cs137 in inverse kinematics and performing particle-γ and particle-γγ coincidence measurements. The low-spin level scheme of Cs137 has been augmented: (i) The expected set of single-proton, seniority υ=1 states has been delineated in its entirety; (ii) Another member of the υ=3 proton 0g7/2 multiplet, a low-lying 9/2+ level, has been identified and this set of states now approaches completion; (iii) A second 9/2+ and a candidate 13/2+ level have been observed. The results are discussed in the framework of shell-model calculations in the proton 2s1d0g0h shell.

Published
2018
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31. Multistep scattering in the 160 MeV208Pb(α, α′) reaction

Author

Chadwick, M. B., Hussein, M., Ramakrishnan, E., Baumann, T., Azhari, A., Kryger, R. A., Pfaff, R., Thoennessen, M., Yokoyama, S., Beene, J. R., Halbert, M. L., Mueller, P. E., Stracener, D. W., Varner, R. L., van Buren, G., Charity, R. J., Hua, P-F., Sarantites, D. G., and Sobotka, L. G.

Published
1995
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32. The A~130 Highly-Deformed Region: New Results and Global Differential Lifetime Measurements

Author

Riley, M. A., primary, Kondev, F. G., additional, Laird, R. W., additional, Pfohl, J., additional, Archer, D. E., additional, Brown, T. B., additional, Clark, R. M., additional, Devlin, M., additional, Fallon, P., additional, Hartley, D. J., additional, Hibbert, I. M., additional, Joss, D. T., additional, LaFosse, D. R., additional, Lerma, F., additional, Nolan, P. J., additional, O’Brien, N. J., additional, Paul, E. S., additional, Sarantites, D. G., additional, Sheline, R. K., additional, Shepherd, S. L., additional, Simpson, J., additional, and Wadsworth, R., additional

Published
2000
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33. Terminating states in the positive-parity structures of As 67

Author

Wadsworth, R., Kelsall, N. S., Jenkins, D. G., Ragnarsson, I., Fischer, S. M., Balamuth, D. P., Hausladen, P. A., Ball, G. C., Carpenter, M. P., Janssens, R. V.F., Lauritsen, T., Lister, C. J., Seweryniak, D., Clark, R. M., Fallon, P., Macchiavelli, A. O., Svensson, C. E., Freeman, S. J., and Sarantites, D. G.

Subjects
Nuclear Theory
Abstract

© 2018 American Physical Society. The energy levels and γ-ray decay scheme of the positive-parity states in the Tz=12 nucleus As67 have been studied by using the Ca40(Ar36,2αp)As67 reaction at a beam energy of 145 MeV. Two new band structures have been identified which can be connected to the previously known levels. The results for these bands are compared with configuration-dependent cranked Nilsson-Strutinsky calculations. The good level of agreement between theory and experiment suggests that these structures can be interpreted in terms of configurations that involve three g92 particles and that both possess noncollective terminating states.

Published
2018

34. Intruder configurations of excited states in the neutron-rich isotopes 33P and 34P

Author

Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P. L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R V F, Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R M, Fallon, P, Paschalis, Stefanos, Petri, Marina Kalliopi, Macchiavelli, A.O., Reviol, W, and Sarantites, D G

Published
2018

35. High spin states of the normally deformed bands of Y83

Author

Rodriguez, W., primary, Cristancho, F., additional, Tabor, S. L., additional, Kardan, A., additional, Ragnarsson, I., additional, Haring-Kaye, R. A., additional, Döring, J., additional, Sarantites, D. G., additional, and Garzón, A., additional

Published
2019
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36. One-neutron transfer study of Xe-137 and systematics of 13/2(1)(+) and 13/2(2)(+) levels in N=83 nuclei

Author

Reviol, W., Sarantites, D. G., Elson, J. M., Kinnison, J. E., Gargano, A., Bottoni, S., Janssens, R. V. F., Allmond, J. M., Ayangeakaa, A. D., Carpenter, M. P., David, H. M., Galindo Uribarri, A., Lauritsen, T., Padilla Rodal, E., Zhu, S., ITACO, Nunzio, Reviol, W., Sarantites, D. G., Elson, J. M., Kinnison, J. E., Gargano, A., Bottoni, S., Janssens, R. V. F., Allmond, J. M., Ayangeakaa, A. D., Carpenter, M. P., David, H. M., Galindo Uribarri, A., Itaco, Nunzio, Lauritsen, T., Padilla Rodal, E., and Zhu, S.

Abstract

Excited states in Xe-137 have been studied by using the near-barrier single-neutron transfer reactions C-13(Xe-136, C-12 gamma) Xe-137 and Be-9(Xe-136, Be-8 gamma) Xe-137 in inverse kinematics. Particle-gamma and particle-gamma gamma coincidence measurements have been performed with the Phoswich Wall and Digital Gammasphere detector arrays. Evidence is found for a 13/2(2)(+) level (E = 3137 keV) and for additional high-lying 3/2(-) and 5/2(-) states. The results are discussed in the framework of realistic shell-model calculations. These calculations are also extended to the 13/2(1)(+) and 13/2(2)(+) levels in the N = 83 isotonic chain. They indicate that there is a need for a value of the neutron 0i(13/2) single-particle energy (E-SPE = 2366 keV) lower than the one proposed in the literature. It is also demonstrated that the population patterns of the j = l +/- 1/2 single-particle states in Xe-137 are different for the two targets used in these measurements and the implications of this effect are addressed.

Published
2016

37. Cross-shell excitations in Si 31

Author

Tai, P. L., Tabor, S. L., Lubna, R. S., Kravvaris, K., Bender, P. C., Tripathi, Vandana, Volya, A., Carpenter, M. P., Janssens, R. V.F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Paschalis, S., Petri, M., Macchiavelli, A. O., Reviol, W., and Sarantites, D. G.

Subjects
1.1 Normal biological development and functioning, Nuclear Experiment
Abstract

© 2017 American Physical Society. The Si31 nucleus was produced through the O18(O18, αn) fusion-evaporation reaction at Elab=24MeV. Evaporated α particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple γ-ray coincidence events were detected in Gammasphere. The energy and angle information for the α particles was used to determine the Si31 recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new γ transitions were observed, including 14 from states above the neutron separation energy. The positive-parity states predicted by the shell-model calculations in the sd model space agree well with experiment. The negative-parity states were compared with shell-model calculations in the psdpf model space with some variations in the N=20 shell gap. The best agreement was found with a shell gap intermediate between that originally used for A≈20 nuclei and that previously adapted for P32,34. This variation suggests the need for a more universal cross-shell interaction.

Published
2017

38. Terminating states in the positive-parity structures of As67

Author

Wadsworth, R., primary, Kelsall, N. S., additional, Jenkins, D. G., additional, Ragnarsson, I., additional, Fischer, S. M., additional, Balamuth, D. P., additional, Hausladen, P. A., additional, Ball, G. C., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, Clark, R. M., additional, Fallon, P., additional, Macchiavelli, A. O., additional, Svensson, C. E., additional, Freeman, S. J., additional, and Sarantites, D. G., additional

Published
2018
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39. Low-spin structure of the N=82 nucleus Cs137

Author

Reviol, W., primary, Sarantites, D. G., additional, Elson, J. M., additional, Kinnison, J. E., additional, Gargano, A., additional, Janssens, R. V. F., additional, Allmond, J. M., additional, Ayangeakaa, A. D., additional, Bottoni, S., additional, Carpenter, M. P., additional, David, H. M., additional, Galindo-Uribarri, A., additional, Itaco, N., additional, Lauritsen, T., additional, Padilla-Rodal, E., additional, and Zhu, S., additional

Published
2018
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40. Intruder configurations of excited states in the neutron-rich isotopes P33 and P34

Author

Lubna, R. S., primary, Tripathi, Vandana, additional, Tabor, S. L., additional, Tai, P.-L., additional, Kravvaris, K., additional, Bender, P. C., additional, Volya, A., additional, Bouhelal, M., additional, Chiara, C. J., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Lauritsen, T., additional, McCutchan, E. A., additional, Zhu, S., additional, Clark, R. M., additional, Fallon, P., additional, Macchiavelli, A. O., additional, Paschalis, S., additional, Petri, M., additional, Reviol, W., additional, and Sarantites, D. G., additional

Published
2018
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41. Examination of the low-energy enhancement of the γ -ray strength function of Fe56

Author

Jones, M. D., primary, Macchiavelli, A. O., additional, Wiedeking, M., additional, Bernstein, L. A., additional, Crawford, H. L., additional, Campbell, C. M., additional, Clark, R. M., additional, Cromaz, M., additional, Fallon, P., additional, Lee, I. Y., additional, Salathe, M., additional, Wiens, A., additional, Ayangeakaa, A. D., additional, Bleuel, D. L., additional, Bottoni, S., additional, Carpenter, M. P., additional, Davids, H. M., additional, Elson, J., additional, Görgen, A., additional, Guttormsen, M., additional, Janssens, R. V. F., additional, Kinnison, J. E., additional, Kirsch, L., additional, Larsen, A. C., additional, Lauritsen, T., additional, Reviol, W., additional, Sarantites, D. G., additional, Siem, S., additional, Voinov, A. V., additional, and Zhu, S., additional

Published
2018
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42. Triaxiality near the ¹¹⁰Ru ground state from Coulomb excitation

Author

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

Abstract

A multi-step Coulomb excitation measurement with the GRETINA and CHICO2 detector arrays was carried out with a 430-MeV beam of the neutron-rich 110Ru (t1/2=12 s) isotope produced at the CARIBU facility. This represents the first successful measurement following the post-acceleration of an unstable isotope of a refractory element. The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations.

Published
2017

44. Cross-shell excitations inSi31

Author

Tai, P.-L., primary, Tabor, S. L., additional, Lubna, R. S., additional, Kravvaris, K., additional, Bender, P. C., additional, Tripathi, Vandana, additional, Volya, A., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Lauritsen, T., additional, McCutchan, E. A., additional, Zhu, S., additional, Clark, R. M., additional, Fallon, P., additional, Paschalis, S., additional, Petri, M., additional, Macchiavelli, A. O., additional, Reviol, W., additional, and Sarantites, D. G., additional

Published
2017
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45. Probing the Symmetry Term of the Nuclear Equation of State at High Baryonic Densities

Author

Russotto, P, primary, Acosta, L, additional, Adamczyk, M, additional, Al-Ajlan, A, additional, Al-Garawi, M, additional, Al-Homaidhi, S, additional, Amorini, F, additional, Auditore, L, additional, Aumann, T, additional, Ayyad, Y, additional, Basrak, Z, additional, Benlliure, J, additional, Boisjoli, M, additional, Boretzky, K, additional, Brzychczyk, J, additional, Budzanowski, A, additional, Caesar, C, additional, Cardella, G, additional, Cammarata, P, additional, Chajecki, Z, additional, Chartier, M, additional, Chbihi, A, additional, Colonna, M, additional, Cozma, M D, additional, Czech, B, additional, De Filippo, E, additional, Di Toro, M, additional, Famiano, M, additional, Gannon, S, additional, Gašparić, I, additional, Grassi, L, additional, Guazzoni, C, additional, Guazzoni, P, additional, Heil, M, additional, Heilborn, L, additional, Introzzi, R, additional, Isobe, T, additional, Kezzar, K, additional, Kiš, M, additional, Krasznahorkay, A, additional, Kupny, S, additional, Kurz, N, additional, La Guidara, E, additional, Lanzalone, G, additional, Lasko, P, additional, Le Fèvre, A, additional, Leifels, Y, additional, Lemmon, R C, additional, Li, QF, additional, Lombardo, I, additional, Łukasik, J, additional, Lynch, W G, additional, Marini, P, additional, Matthews, Z, additional, May, L, additional, Minniti, T, additional, Mostazo, M, additional, Pagano, A, additional, Pagano, E V, additional, Papa, M, additional, Pawłowski, P, additional, Pirrone, S, additional, Politi, G, additional, Porto, F, additional, Reviol, W, additional, Riccio, F, additional, Rizzo, F, additional, Rosato, E, additional, Rossi, D, additional, Santoro, S, additional, Sarantites, D G, additional, Simon, H, additional, Skwirczynska, I, additional, Sosin, Z, additional, Stuhl, L, additional, Trautmann, W, additional, Trifirò, A, additional, Trimarchi, M, additional, Tsang, M B, additional, Verde, G, additional, Veselsky, M, additional, Vigilante, M, additional, Wang, Yongjia, additional, Wieloch, A, additional, Wigg, P, additional, Winkelbauer, J, additional, Wolter, H H, additional, Wu, P, additional, Yennello, S, additional, Zambon, P, additional, Zetta, L, additional, and Zoric, M, additional

Published
2017
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46. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

Russotto, P., primary, Gannon, S., additional, Kupny, S., additional, Lasko, P., additional, Acosta, L., additional, Adamczyk, M., additional, Al-Ajlan, A., additional, Al-Garawi, M., additional, Al-Homaidhi, S., additional, Amorini, F., additional, Auditore, L., additional, Aumann, T., additional, Ayyad, Y., additional, Basrak, Z., additional, Benlliure, J., additional, Boisjoli, M., additional, Boretzky, K., additional, Brzychczyk, J., additional, Budzanowski, A., additional, Caesar, C., additional, Cardella, G., additional, Cammarata, P., additional, Chajecki, Z., additional, Chartier, M., additional, Chbihi, A., additional, Colonna, M., additional, Cozma, M. D., additional, Czech, B., additional, De Filippo, E., additional, Di Toro, M., additional, Famiano, M., additional, Gašparić, I., additional, Grassi, L., additional, Guazzoni, C., additional, Guazzoni, P., additional, Heil, M., additional, Heilborn, L., additional, Introzzi, R., additional, Isobe, T., additional, Kezzar, K., additional, Kiš, M., additional, Krasznahorkay, A., additional, Kurz, N., additional, La Guidara, E., additional, Lanzalone, G., additional, Le Fèvre, A., additional, Leifels, Y., additional, Lemmon, R. C., additional, Li, Q. F., additional, Lombardo, I., additional, Łukasik, J., additional, Lynch, W. G., additional, Marini, P., additional, Matthews, Z., additional, May, L., additional, Minniti, T., additional, Mostazo, M., additional, Pagano, A., additional, Pagano, E. V., additional, Papa, M., additional, Pawłowski, P., additional, Pirrone, S., additional, Politi, G., additional, Porto, F., additional, Reviol, W., additional, Riccio, F., additional, Rizzo, F., additional, Rosato, E., additional, Rossi, D., additional, Santoro, S., additional, Sarantites, D. G., additional, Simon, H., additional, Skwirczynska, I., additional, Sosin, Z., additional, Stuhl, L., additional, Trautmann, W., additional, Trifirò, A., additional, Trimarchi, M., additional, Tsang, M. B., additional, Verde, G., additional, Veselsky, M., additional, Vigilante, M., additional, Wang, Yongjia, additional, Wieloch, A., additional, Wigg, P., additional, Winkelbauer, J., additional, Wolter, H. H., additional, Wu, P., additional, Yennello, S., additional, Zambon, P., additional, Zetta, L., additional, and Zoric, M., additional

Published
2016
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47. One-neutron transfer study ofXe137and systematics of13/21+and13/22+levels inN=83nuclei

Author

Reviol, W., primary, Sarantites, D. G., additional, Elson, J. M., additional, Kinnison, J. E., additional, Gargano, A., additional, Bottoni, S., additional, Janssens, R. V. F., additional, Allmond, J. M., additional, Ayangeakaa, A. D., additional, Carpenter, M. P., additional, David, H. M., additional, Galindo-Uribarri, A., additional, Itaco, N., additional, Lauritsen, T., additional, Padilla-Rodal, E., additional, and Zhu, S., additional

Published
2016
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48. High-spin transition quadrupole moments in neutron-rich Mo and Ru nuclei: testing $��$ softness?

Author

Snyder, J. B., Reviol, W., Sarantites, D. G., Afanasjev, A. V., Janssens, R. V. F., Abusara, H., Carpenter, M. P., Chen, X., Chiara, C. J., Greene, J. P., Lauritsen, T., McCutchan, E. A., Seweryniak, D., and Zhu, S.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The transition quadrupole moments, $Q_{t}$, of rotational bands in the neutron-rich, even-mass $^{102-108}$Mo and $^{108-112}$Ru nuclei were measured in the 8 to 16 $\hbar $ spin range with the Doppler-shift attenuation method. The nuclei were populated as fission fragments from $^{252}$Cf fission. The detector setup consisted of the Gammasphere spectrometer and the HERCULES fast-plastic array. At moderate spin, the $Q_{t}$ moments are found to be reduced with respect to the values near the ground states. Attempts to describe the observations in mean-field-based models, specifically cranked relativistic Hartree-Bogoliubov theory, illustrate the challenge theory faces and the difficulty to infer information on $��$ softness and triaxiality from the data., 17 pages, 4 figures

Published
2013
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49. Extensive Gamma-ray Spectroscopy of Band Structures in 62Zn

Author

Gellanki, Jnaneswari, Rudolph, Dirk, Ragnarsson, Ingemar, Andersson, Lise-Lotte, Andreoiu, Corina, Carpenter, M. P., Ekman, Jörgen, Fahlander, Claes, Johansson, Emma, Kardan, A., Reviol, W., Sarantites, D. G., Seweryniak, D., Svensson, C. E., and Waddington, J. C.

Subjects
Nuclear Theory, Subatomic Physics, Physical Sciences
Abstract

An experimental study of the Zn-62 nucleus has been performed by combining the data sets from four fusion-evaporation reaction experiments. Apart from the previously published data, the present results include ten new rotational band structures and two more superdeformed bands. The Gammasphere Ge-detector array in conjunction with the 4 pi charged-particle detector array Microball allowed for the detection of gamma rays in coincidence with evaporated light particles. The deduced level scheme includes some 260 excited states, which are connected with more than 450 gamma-ray transitions. Spins and parities of the excited states have been determined via directional correlations of. rays emitted from oriented states. The experimental characteristics of the rotational bands are analyzed and compared with results from cranked Nilsson-Strutinsky calculations. The present analysis, combined with available experimental results in the A similar to 60 mass region, can be used to improve the current set of Nilsson parameters in the N = 3 and N = 4 oscillator shells.

Published
2012

50. 67As-67Se mirror pair spectroscopy

Author

Wiedemann, K. T., Medina, N. H., Angelis, G., Orlandi, R., Bracco, A., Carpenter, M., Chiara, C. J., Della Vedova, F., Farnea, E., Andres Gadea, Greene, J., Lenzi, S. M., Leoni, S., Lister, C. J., Lunardi, S., Marginean, N., Napoli, D. R., Singh, B. S. Nara, Pechenaya, O. L., Reviol, W., Sahin, E., Sarantites, D. G., Seweryniak, D., Tonev, D., Ur, C. A., Valiente-Dobon, J. J., Wadsworth, R., and Zhu, S.

Published
2009

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