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10. νi13/2 structures in 155Sm and 159Gd: Supporting evidence of a Z=60 deformed subshell gap

Author

Hartley, D.J., Kondev, F.G., Janssens, R.V.F., Carpenter, M.P., Little, D., Lauritsen, T., Hoffman, C.R., Heery, J., Savard, G., Simpson, J., Auranen, K., Clark, J.A., Boston, A.J., Wilson, G.L., Stolze, S., Villafana, K., Riley, M.A., Li, J., Greene, J.P., Seweryniak, D., Paul, E.S., Zhu, S., Ayangeakaa, A.D., Baron, J.S., and Wu, J.

Abstract

Maximal ground-state deformation should occur when both proton and neutron Fermi surfaces are located at midshell. However, subshell gaps that stabilize large deformation can exist at proton or neutron values other than midshell. One such gap may occur at Z=60 in the rare-earth region, as the energy of the first 2+ states in even-even nuclei are often lowest in an isotonic chain for neodymium (Z=60) rather than the midshell isotopes of dysprosium (Z=66). Further evidence of this deformed gap has now been observed by investigating the signature splitting systematics of the νi13/2 bands found in the odd-N, rare-earth nuclei. These were aided by the present observation of the νi13/2 band in Gd159 and the confirmation of the same structure in Sm155 via the transfer of a neutron from a Gd160 beam to a Sm154 target.

Published
2022
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11. New narrow resonances observed in the unbound nucleus <math><mmultiscripts><mi mathvariant='normal'>F</mi><mprescripts/><none/><mn>15</mn></mmultiscripts></math>

Author

Girard-Alcindor, V., Mercenne, A., Stefan, I., de Oliveira Santos, F., Michel, N., Płoszajczak, M., Assié, M., Lemasson, A., Clément, E., Flavigny, F., Matta, A., Ramos, D., Rejmund, M., Dudouet, J., Ackermann, D., Adsley, P., Assunção, M., Bastin, B., Beaumel, D., Benzoni, G., Borcea, R., Boston, A.J., Cáceres, L., Cederwall, B., Celikovic, I., Chudoba, V., Ciemala, M., Collado, J., Crespi, F.C.L., d'Agata, G., de France, G., Delaunay, F., Diget, C., Domingo-Pardo, C., Eberth, J., Fougères, C., Franchoo, S., Galtarossa, F., Georgiadou, A., Gibelin, J., Giraud, S., González, V., Goyal, N., Gottardo, A., Goupil, J., Grévy, S., Guimaraes, V., Hammache, F., Harkness-Brennan, L.J., Hess, H., Oliver, D.S. Judson, Kamalou, O., Kameneyero, A., Kiener, J., Korten, W., Koyama, S., Labiche, M., Lalanne, L., Lapoux, V., Leblond, S., Lefevre, A., Lenain, C., Leoni, S., Li, H., Lopez-Martens, A., Maj, A., Matea, I., Menegazzo, R., Mengoni, D., Meyer, A., Million, B., Monteagudo, B., Morfouace, P., Mrazek, J., Niikura, M., Piot, J., Podolyak, Zs., Portail, C., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rezynkina, K., Roger, T., Rojo, J.S., Rotaru, F., Salsac, M.D., Benitez, A.M. Sánchez, Sanchis, E., Şenyigit, M., de Séréville, N., Siciliano, M., Simpson, J., Sohler, D., Sorlin, O., Stanoiu, M., Stodel, C., Suzuki, D., Theisen, C., Thomas, J.C., Ujic, P., Valiente-Dobón, J.J., Zielińska, M., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and ANR-17-CE31-0026,OASIS,Optimisation d'Agata pour la physique(2017)

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

International audience; The structure of the unbound F15 nucleus is investigated using the inverse kinematics resonant scattering of a radioactive O14 beam impinging on a CH2 target. The analysis of H1(O14,p)O14 and H1(O14,2p)N13 reactions allowed the confirmation of the previously observed narrow 1/2− resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2− and 3/2− resonances. The newly observed levels decay by 1p emission to the ground of O14, and by sequential 2p emission to the ground state of N13 via the 1− resonance of O14. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2− and 3/2− resonances may be collectivized by the continuum coupling to nearby 2p- and 1p-decay channels. The observed excitation function H1(O14,p)O14 and resonance spectrum in F15 are well reproduced in the unified framework of the GSM.

Published
2022

12. Narrow resonances in the continuum of the unbound nucleus $^{15}$F

Author

Girard-Alcindor, V., Mercenne, A., Stefan, I., de Oliveira Santos, F., Michel, N., Płoszajczak, M., Assié, M., Lemasson, A., Clément, E., Flavigny, F., Matta, A., Ramos, D., Rejmund, M., Dudouet, J., Ackermann, D., Adsley, P., Assunção, M., Bastin, B., Beaumel, D., Benzoni, G., Borcea, R., Boston, A.J., Cáceres, L., Cederwall, B., Celikovic, I., Chudoba, V., Ciemala, M., Collado, J., Crespi, F.C.L., D'Agata, G., De France, G., Delaunay, F., Diget, C., Domingo-Pardo, C., Eberth, J., Fougères, C., Franchoo, S., Galtarossa, F., Georgiadou, A., Gibelin, J., Giraud, S., González, V., Goyal, N., Gottardo, A., Goupil, J., Grévy, S., Guimaraes, V., Hammache, F., Harkness-Brennan, L.J., Hess, H., Oliver, D.S. Judson, Kamalou, O., Kameneyero, A., Kiener, J., Korten, W., Koyama, S., Labiche, M., Lalanne, L., Lapoux, V., Leblond, S., Lefevre, A., Lenain, C., Leoni, S., Li, H., Lopez-Martens, A., Maj, A., Matea, I., Menegazzo, R., Mengoni, D., Meyer, A., Million, B., Monteagudo, B., Morfouace, P., Mrazek, J., Niikura, M., Piot, J., Podolyak, Zs., Portail, C., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rezynkina, K., Roger, T., Rojo, J.S., Rotaru, F., Salsac, M.D., Benitez, A.M. Sánchez, Sanchis, E., Şenyigit, M., De Séréville, N., Siciliano, M., Simpson, J., Sohler, D., Sorlin, O., Stanoiu, M., Stodel, C., Suzuki, D., Theisen, C., Thomas, J.C., Ujic, P., Valiente-Dobón, J.J., Zielińska, M., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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, Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The structure of the unbound $^{15}$F nucleus is investigated using the inverse kinematics resonant scattering of a radioactive $^{14}$O beam impinging on a CH$_2$ target. The analysis of $^{1}$H($^{14}$O,p)$^{14}$O and $^{1}$H($^{14}$O,2p)$^{13}$N reactions allowed the confirmation of the previously observed narrow $1/2^{-}$ resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2$^{-}$ and 3/2$^{-}$ resonances. The newly observed levels decay by 1p emission to the ground of $^{14}$O, and by sequential 2p emission to the ground state (g.s.) of $^{13}$N via the $1^-$ resonance of $^{14}$O. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2$^{-}$ and 3/2$^{-}$ resonances may be collectivized by the continuum coupling to nearby 2p- and 1p- decay channels. The observed excitation function $^{1}$H($^{14}$O,p)$^{14}$O and resonance spectrum in $^{15}$F are well reproduced in the unified framework of the GSM., Comment: 7 pages, 4 figures

Published
2021

13. Evidence for enhanced neutron-proton correlations from the level structure of the $N=Z+1$ nucleus $_{43}^{87}\mathrm{Tc}_{44}$

Author

Liu, X., Cederwall, B., Qi, C., Wyss, R.A., Aktas, Ö., Ertoprak, A., Zhang, W., Clément, E., De France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B.M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J.J., Al-Azri, H., Ataç Nyberg, A., Bäck, T., De Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D.R., Petrache, C.M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A.J., Boston, H.C., Burrows, I., Charles, L., Ciemala, M., Crespi, F.C.L., Cullen, D.M., Désesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Huyuk, T., Jungclaus, A., Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R.M., Podolyàk, Zs., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, C., Zielińska, M., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

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

The low-lying excited states in the neutron-deficient $N = Z + 1$ nucleus $^{87}_{43}$Tc$_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe $(^{36}Ar, 2n1p)$ $^{87}$Tc at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of $^{87}$Tc from the $(9/2^+_{g.s})$ state to the $( 33 / 2^+_1$) state was established based on six mutually coincident γ -ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at $ℏω ≈ 0.50$ MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around $N=44$ is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the $N=Z$ line. The low-lying excited states in the neutron-deficient $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, $2n1p$)$^{87}$Tc at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt $\gamma$-rays, neutrons, and charged particles emitted in the reaction. A level scheme of $^{87}$Tc from the (9/2$^{+}_{g.s.}$) state to the (33/2$^{+}_{1}$) state was established based on 6 mutually coincident $\gamma$-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at $\hbar\omega\approx 0.50$ MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around $N=44$ is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the $N=Z$ line.

Published
2021

14. Compton imaging with the PorGamRays spectrometer

Author

Judson, D.S., Boston, A.J., Coleman-Smith, P.J., Cullen, D.M., Hardie, A., Harkness, L.J., Jones, L.L., Jones, M., Lazarus, I., Nolan, P.J., Pucknell, V., Rigby, S.V., Seller, P., Scraggs, D.P., Simpson, J., Slee, M., and Sweeney, A.

Published
2011
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16. Interaction position resolution simulations and in-beam measurements of the AGATA HPGe detectors

Author

Söderström, P.-A., Recchia, F., Nyberg, J., Al-Adili, A., Ataç, A., Aydin, S., Bazzacco, D., Bednarczyk, P., Birkenbach, B., Bortolato, D., Boston, A.J., Boston, H.C., Bruyneel, B., Bucurescu, D., Calore, E., Colosimo, S., Crespi, F.C.L., Dosme, N., Eberth, J., Farnea, E., Filmer, F., Gadea, A., Gottardo, A., Grave, X., Grebosz, J., Griffiths, R., Gulmini, M., Habermann, T., Hess, H., Jaworski, G., Jones, P., Joshi, P., Judson, D.S., Kempley, R., Khaplanov, A., Legay, E., Lersch, D., Ljungvall, J., Lopez-Martens, A., Meczynski, W., Mengoni, D., Michelagnoli, C., Molini, P., Napoli, D.R., Orlandi, R., Pascovici, G., Pullia, A., Reiter, P., Sahin, E., Smith, J.F., Strachan, J., Tonev, D., Unsworth, C., Ur, C.A., Valiente-Dobón, J.J., Veyssiere, C., and Wiens, A.

Published
2011
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18. Gamma-ray imaging performance of the GRI+ Compton camera

Author

Caffrey, A., primary, Harkness-Brennan, L.J., additional, Alshammari, H., additional, Boston, A.J., additional, Boston, H.C., additional, Griffiths, O., additional, Judson, D.S., additional, Kalantan, S., additional, Le Crom, B., additional, Nolan, P.J., additional, Powell, A., additional, Platt, J., additional, Randall, G., additional, Reid, C., additional, Rintoul, E., additional, Unsworth, C., additional, Woodroof, T.F., additional, Burrows, I., additional, Lazarus, I.H., additional, Simpson, J., additional, and Atkinson, K.D., additional

Published
2021
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20. The use of EXOGAM for in-beam spectroscopy of proton drip-line nuclei with radioactive ion beams

Author

Petri, M., Paul, E.S., Nolan, P.J., Boston, A.J., Boston, H.C., Cooper, R.J., Dimmock, M.R., Gros, S., McGuirk, B.M., Turk, G., Guinet, D., Lautesse, Ph., Meyer, M., Redon, N., Rossé, B., Schmitt, Ch., Stézowski, O., Bhattacharyya, S., De France, G., Mukherjee, G., Rejmund, F., Savajols, H., Scheurer, J.N., Gál, J., Molnár, J., Nyakó, B.M., Timár, J., Zolnai, L., Juhász, K., Astier, A., Deloncle, I., Porquet, M.G., Prévost, A., Pucknell, V.F.E., Wadsworth, R., Joshi, P., La Rana, G., Moro, R., Trotta, M., Vardaci, E., Hackman, G., and Ball, G.C.

Published
2009
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25. Reinterpretation of excited states in $^{212}$Po: Shell-model multiplets rather than $\alpha$-cluster states

Author

Fernández, A., Jungclaus, A., Golubev, P., Rudolph, D., Sarmiento, L.G., Gargano, A., Naïdja, H., Astier, A., Dupont, E., Gadea, A., Nácher, E., Perea, A., Wimmer, K., Clément, E., Fremont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H.J., Ljungvall, J., Ménager, L., Pérez-Vidal, R.M., Petrache, C.M., Ralet, D., Ropert, J.A., Saillant, F., Såmark-Roth, A., Simpson, G.S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lalović, N., Lorenz, Ch., Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A.J., Boston, H.C., Bracco, A., Ciemala, M., Collado, J., Cullen, D.M., Domingo-Pardo, C., Eberth, J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D.R., Nyberg, J., Podolyak, Zs., Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente-Dobón, J.J., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, Nuclear Physics - Theory
Abstract

International audience; A $\gamma$ -ray spectroscopic study of $^{212}$Po was performed at the Grand Accélérateur National d’Ions Lourds, using the inverse kinematics α-transfer reaction $^{12}$C($^{208}$Pb, $^{212}$Po) $^8$Be and the AGATA spectrometer. A careful analysis based on $\gamma \gamma$ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of $1^-$ and $2^-$ and excitation energies below 2.1 MeV, which have been predicted by recent αcluster model calculations. A systematic comparison of the experimentally established excitation scheme of $^{212}$Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4$^-$), 1751 (8$^-$), 1787 (6$^-$), 1946 (4$^-$), 1986 (8$^-$), and 2016 (6$^-$) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of $^{212}$Po is supported by experimental information with respect to the linear polarization of $\gamma$ rays, which suggests a magnetic character of the 432-keV $\gamma$ ray decaying from the state at an excitation energy of 1787 keV to the $6^+_1$ yrast state, and exclusive reaction cross sections.

Published
2021

26. Possible quenching of static neutron pairing near the N=98 deformed shell gap: Rotational structures in Gd 160,161

Author

Greene, J.P., Clark, J.A., Li, J., Lauritsen, T., Hartley, D.J., Savard, G., Baron, J.S., Heery, J., Stolze, S., Little, D., Zhu, S., Riley, M.A., Kondev, F.G., Seweryniak, D., Villafana, K., Carpenter, M.P., Wu, J., Boston, A.J., Jackson, P., Hoffman, C.R., Wilson, G.L., Ayangeakaa, A.D., Paul, E.S., Frauendorf, S., Auranen, K., Janssens, R.V.F., and Simpson, J.

Abstract

A Gd160 beam was accelerated to an energy of 1000 MeV and, separately, bombarded thick targets of Sm154 and Dy164 in order to observe neutron-rich, rare-earth nuclei via deep-inelastic collision processes. Gammasphere was utilized to observe ?-ray emissions. Many new states and transitions were observed in Gd160 as a result of so-called unsafe Coulomb excitation. The ground-state band in Gd160 has been extended to Ip=20+ and a rotational band based on the Kp=4+ state, previously associated with a hexadecapole vibration, was observed up to 18+. The quasiparticle configuration of the Kp=4+ band has been determined, and its unusual alignment behavior may result from a possible quenching of static neutron pairing. In addition, the band based on the [523]5/2 quasineutron orbital in Gd161 was extended from 11/2- to 33/2- and also displays the same unusual alignment behavior.

Published
2021
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27. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in Sn

Author

Siciliano, M., Valiente-Dobón, J.J., Goasduff, A., Nowacki, F., Zuker, A.P., Bazzacco, D., Lopez-Martens, A., Clément, E., Benzoni, G., Braunroth, T., Crespi, F.C.L., Cieplicka-Oryńczak, N., Doncel, M., Ertürk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P.R., Kuti, I., Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatović, T., Müller-Gatermann, C., Napoli, D.R., Nyberg, J., Palacz, M., Pérez-Vidal, R.M., Sayği, B., Sohler, D., Szilner, S., Testov, D., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, H.C., Boston, A.J., Cederwall, B., Collado, J., Cullen, D.M., Désesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F.J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Stezowski, O., and Theisen, Ch.

Abstract

The lifetimes of the low-lying excited states 2+ and 4+ have been directly measured in the neutron-deficient $^{106,108}$Sn isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted γ rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2;21+→0g.s.+) values and it describes well the experimental pattern for $^{104−114}$Sn; the B(E2;41+→21+) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in $^{108}$Sn.

Published
2020

29. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn

Author

Siciliano, M., Valiente-Dobón, J.J., Goasduff, A., Nowacki, F., Zuker, A.P., Bazzacco, D., Lopez-Martens, A., Clément, E., Benzoni, G., Braunroth, T., Crespi, F.C.L., Cieplicka-Oryńczak, N., Doncel, M., Ertürk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P.R., Kuti, I., Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatović, T., Müller-Gatermann, C., Napoli, D.R., Nyberg, J., Palacz, M., Pérez-Vidal, R.M., Sayği, B., Sohler, D., Szilner, S., Testov, D., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, H.C., Boston, A.J., Cederwall, B., Collado, J., Cullen, D.M., Désesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F.J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Stezowski, O., and Theisen, Ch.

Published
2020
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30. Testing $ab initio$ nuclear structure in neutron-rich nuclei: lifetime measurements of second 2$^+$ states in $^{16}$C and $^{20}$O

Author

Ciemala, M., Ziliani, S., Crespi, F.C.L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M.N., Iskra, L.W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S.M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D.R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Atac, A., Barrientos, D., Birkenbach, B., Boston, A.J., Cederwall, B., Charles, L., Collado, J., Cullen, D.M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Gonzalez, V., Goupil, J., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Nyberg, J., Perez-Vidal, R.M., Podolyak, Zs., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente-Dobon, J.J., Holt, J.D., Menendez, J., Schwenk, A., Simonis, J., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Institut Laue-Langevin (ILL), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), ILL, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear Theory (nucl-th), nucl-th, Nuclear Theory, Nuclear Physics - Theory, Starke Wechselwirkung und exotische Kerne – Abteilung Blaum, FOS: Physical sciences, Nuclear Physics - Experiment, ddc:530, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Nuclear Structure, Nuclear Experiment
Abstract

To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich O20,τ(22+)=150−30+80fs, and an estimate for the lifetime of the second 2+ state in C16 have been obtained for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds of femtoseconds range by analyzing the Doppler-shifted γ-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction O18(7.0MeV/u)+Ta181. The requested sensitivity could only be reached owing to the excellent performances of the Advanced γ-Tracking Array AGATA, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two- and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for O20 and with the no-core shell model for C16. The present measurement shows the power of electromagnetic observables, determined with high-precision γ spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetime measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense beams, produced by Isotope Separation On-Line (ISOL) techniques, become available. To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich 20O, tau(2+_2 ) = 150(+80-30) fs, and an estimate for the lifetime of the second 2+ state in 16C have been obtained, for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds femtoseconds range, by analyzing the Doppler-shifted gamma-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction 18O (7.0 MeV/u) + 181Ta. The requested sensitivity could only be reached owing to the excellent performances of the AGATA gamma-tracking array, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two- and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for 20O, and with the no-core shell model for 16C. The present measurement shows the power of electromagnetic observables, determined with high-precision gamma spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetimes measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense ISOL-type beams become available.

Published
2020

33. The TRIUMF nuclear structure program and TIGRESS

Author

Garrett, P.E., Andreyev, A., Austin, R.A.E., Ball, G.C., Bandyopadhyay, D., Becker, J.A., Boston, A.J., Boston, H.C., Chakrawarthy, R.S., Churchman, R., Cline, D., Cooper, R.J., Cross, D., Dashdorj, D., Demand, G.A., Dimmock, M.R., Drake, T., Finlay, P., Gagnon, K., Gallant, A.T., Green, K.L., Grint, A.N., Grinyer, G.F., Hackman, G., Harkness, L.J., Hayes, A.B., Kanungo, R., Kulp, W.D., Leach, K.G., Lee, G., Leslie, J.R., Maharaj, R., Martin, J.-P., Mattoon, C., Mills, W.J., Morton, A.C., Nelson, L., Newman, O., Nolan, P.J., Padilla-Rodal, E., Pearson, C.J., Phillips, A.A., Porter-Peden, M., Ressler, J.J., Ruiz, C., Sarazin, F., Schumaker, M.A., Scraggs, D.P., Strange, M.D., Subramanian, M., Svensson, C.E., Waddington, J.C., Wan, J., Whitbeck, A., Williams, S.J., Wood, J.L., Wong, J.C., Wu, C.Y., and Zganjar, E.F.

Published
2007
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34. Isospin properties of nuclear pair correlations from the level structure of the self-conjugate nucleus 88Ru

Author

Podolyak, Zsolt, Cederwall, B., Liu, X., Aktas, O., Ertoprak, A., Zhang, W., Qi, C., Clement, E., de France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyako, B.M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobon, J.J, Al-Azri., H., Atac Nyberg, A., Back, T., de. Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Juardo, M., Ljunvall, J., Mengoni, D., Napoli, D.R, Petrache, C.M, Sohler, D., Timar, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A.J, Boston, H.C, Burrows, I., Charles, L., Ciemala, M., Crespi, F.C.L, Cullen, D.M, Desesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Erturk, S., Gonzalez, V., Goupil, J., Hess, H., Huyuk, T., Jungclaus, A., Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R.M, Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D, Sanchis, E., Simpson, J., Stezowski, O., Theisen, Ch., and Zielinska, M.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide 88 44Ru44 has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in 88Ru were populated via the 54Fe(36Ar; 2n )88Ru fusion-evaporation reaction at the Grand Acc�el�erateur National d'Ions Lourds (GANIL) accelerator complex. The observed -ray cascade is assigned to 88Ru using clean prompt - -2-neutron coincidences in anti-coincidence with the detection of charged particles, con�rming and extending the previously assigned sequence of low-lying excited states. It is consistent with a moderately deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring N > Z nuclides. The direct observation of such a \delayed" rotational alignment in a deformed N = Z nucleus is in agreement with theoretical predictions related to the presence of strong isoscalar neutron-proton pair correlations.

Published
2019

35. Lifetime measurements in Ti 52,54 to study shell evolution toward N=32

Author

Goldkuhle, A., Fransen, C., Blazhev, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dewald, A., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.H., Lemasson, A., Lenzi, Silvia M., Li, H.J., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B.S., Pérez-Vidal, R.M., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K.O., Ataç, A., Barrientos, D., Barthe-Dejean, C., Benzoni, G., Boston, A.J., Boston, H.C., Bourgault, P., Burrows, I., Cacitti, J., Cederwall, B., Ciemala, M., Cullen, D.M., De France, G., Domingo Pardo, César, Foucher, J.L., Fremont, G., Gadea, Andrés, Gangnant, P., González, V., Goupil, J., Henrich, C., Houarner, C., Sanchis, E., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Nuclear Experiment
Abstract

AGATA Collaboration, Lifetimes of the excited states in the neutron-rich Ti52,54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the γ-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. A comparison between the transition probabilities obtained from the measured lifetimes of the 21+ to 81+ yrast states in Ti52,54 and that from the shell-model calculations based on the well-established GXPF1A, GXPF1B, and KB3G fp shell interactions support the N=32 subshell closure. The B(E2) values for Ti52 determined in this work are in disagreement with the known data, but are consistent with the predictions of the shell-model calculations and reduce the previously observed pronounced staggering across the even-even titanium isotopes.

Published
2019

36. TRIUMF-ISAC Gamma-Ray Escape-Suppressed Spectrometer (TIGRESS): a versatile tool for radioactive beam physics

Author

Ball, G.C., Andreyev, A., Austin, R.A.E., Bandyopadhyay, D., Becker, J.A., Boston, A.J., Boston, H.C., Chen, A., Churchman, R., Cifarelli, F., Cline, D., Cooper, R.J., Cross, D.S., Dashdorj, D., Demand, G., Dimmock, M.R., Drake, T.E., Finlay, P., Gagon-Moisan, F., Gallant, A.T., Garrett, P.E., Green, K.L., Grint, A.N., Hackman, G., Harkness, L.J., Hayes, A.B., Kanungo, R., Leach, K.G., Lee, G., Maharaj, R., Martin, J.-P., Morton, A.C., Mythili, S., Nelson, L., Newman, O., Nolan, P.J., Padilla-Rodal, E., Pearson, C.J., Phillips, A.A., Porter-Peden, M., Ressler, J.J., Roy, R., Ruiz, C., Savajols, H., Sarazin, F., Schumaker, M.A., Scraggs, D.P., Svensson, C.E., Waddington, J.C., Wan, J.M., Whitbeck, A., Williams, S.J., Wong, J., and Wu, C.Y.

Published
2007
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40. Optimization of Compton-suppression and summing schemes for the TIGRESS HPGe detector array

Author

Schumaker, M.A., Svensson, C.E., Andreoiu, C., Andreyev, A., Austin, R.A.E., Ball, G.C., Bandyopadhyay, D., Boston, A.J., Chakrawarthy, R.S., Churchman, R., Drake, T.E., Finlay, P., Garrett, P.E., Grinyer, G.F., Hackman, G., Hyland, B., Jones, B., Maharaj, R., Morton, A.C., Pearson, C.J., Phillips, A.A., Sarazin, F., Scraggs, H.C., Smith, M.B., Valiente-Dobón, J.J., Waddington, J.C., and Watters, L.M.

Published
2007
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43. Measured and simulated performance of Compton-suppressed TIGRESS HPGe clover detectors

Author

Schumaker, M.A., Hackman, G., Pearson, C.J., Svensson, C.E., Andreoiu, C., Andreyev, A., Austin, R.A.E., Ball, G.C., Bandyopadhyay, D., Boston, A.J., Chakrawarthy, R.S., Churchman, R., Drake, T.E., Finlay, P., Garrett, P.E., Grinyer, G.F., Hyland, B., Jones, B., Maharaj, R., Morton, A.C., Phillips, A.A., Sarazin, F., Scraggs, H.C., Smith, M.B., Valiente-Dobón, J.J., Waddington, J.C., and Watters, L.M.

Published
2007
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45. Isospin dependence of electromagnetic transition strengths among an isobaric triplet

Author

Boso, A., Milne, S.A., Bentley, M.A., Recchia, F., Lenzi, S.M., Rudolph, D., Labiche, M., Pereira-Lopez, X., Afara, S., Ameil, F., Arici, T., Aydin, S., Axiotis, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A.J., Boston, H.C., Boutachkov, P., Bracco, A., Bruce, A.M., Bruyneel, B., Cederwall, B., Clement, E., Cortes, M.L., Cullen, D.M., Désesquelles, P., Dombràdi, Zs., Domingo-Pardo, C., Eberth, J., Fahlander, C., Gelain, M., González, V., John, P.R., Gerl, J., Golubev, P., Górska, M., Gottardo, A., Grahn, T., Grassi, L., Habermann, T., Harkness-Brennan, L.J., Henry, T.W., Hess, H., Kojouharov, I., Korten, W., Lalović, N., Lettmann, M., Lizarazo, C., Louchart-Henning, C., Menegazzo, R., Mengoni, D., Merchan, E., Michelagnoli, C., Million, B., Modamio, V., Moeller, T., Napoli, D.R., Nyberg, J., Nara Singh, B.S., Pai, H., Pietralla, N., Pietri, S., Podolyak, Zs., Perez Vidal, R.M., Pullia, A., Ralet, D., Rainovski, G., Reese, M., Reiter, P., Salsac, M.D., Sanchis, E., Sarmiento, L.G., Schaffner, H., Scruton, L.M., Singh, P.P., Stahl, C., Uthayakumaar, S., Valiente-Dobón, J.J., and Wieland, O.

Published
2019
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46. Evidence of octupole-phonons at high spin in 207Pb

Author

Ralet, D., Clément, E., Georgiev, G., Stuchbery, A.E., Rejmund, M., Van Isacker, P., de France, G., Lemasson, A., Ljungvall, J., Michelagnoli, C., Navin, A., Balabanski, D.L., Atanasova, L., Blazhev, A., Bocchi, G., Carroll, R., Dudouet, J., Dupont, E., Fornal, B., Franchoo, S., Fransen, C., Müller-Gatermann, C., Goasduff, A., Gadea, A., John, P.R., Kocheva, D., Konstantinopoulos, T., Korichi, A., Kusoglu, A., Lenzi, S.M., Leoni, S., Lozeva, R., Maj, A., Perez, R., Pietralla, N., Shand, C., Stezowski, O., Wilmsen, D., Yordanov, D., Barrientos, D., Bednarczyk, P., Birkenbach, B., Boston, A.J., Boston, H.C., Burrows, I., Cederwall, B., Ciemala, M., Collado, J., Crespi, F., Cullen, D., Eberth, H.J., Goupil, J., Harkness, L., Hess, H., Jungclaus, A., Korten, W., Labiche, M., Menegazzo, R., Mengoni, D., Million, B., Nyberg, J., Podolyák, Zs., Pullia, A., Quintana Arnés, B., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D., Sanchis, E., Theisen, C., Valiente Dobon, J.J., and Wieland, O.

Published
2019
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48. The GRT4 VME pulse processing card for segmented Germanium detectors

Author

Lazarus, I.H., Appelbe, D.E., Boston, A.J., Coleman-Smith, P.J., Cresswell, J.R., Descovich, M., Gros, S.A.A., Lauer, M., Norman, J., Pearson, C.J., Pucknell, V.F.E., Sampson, J.A., Turk, G., and Valiente-Dobon, J.J.

Subjects
Gamma rays -- Analysis, Detectors -- Product development, Business, Electronics, Electronics and electrical industries
Abstract

A four-channel VERSAmodule Eurocard (VME) with 14 bit, 80 MHz digitizers and powerful on-board processing has been designed, built, and used in tests of digital pulse processing techniques for gamma-ray tracking. This paper explains the background, describes the VME card (known as the GRT4) and presents a 64-channel GRT4 digitizing system which was used to instrument two segmented Germanium detectors during in-beam tests. Results obtained using the GRT4 card are presented as well as some applications. Index Terms--Digital signal processing, digitizer, field programmable gate arrays (FPGAs), gamma-ray spectroscopy detectors, germanium radiation detectors, pulse shape analysis (PSA), segmented detectors.

Published
2004

49. High-spin states in the 96Tc nucleus

Author

Bucurescu, D., Căta-Danil, Gh., Căta-Danil, I., Ivaşcu, M., Mărginean, N., Rusu, C., Stroe, L., Ur, C.A., Gizon, A., Gizon, J., Nyakó, B., Timár, J., Zolnai, L., Boston, A.J., Joss, D.T., Paul, E.S., Semple, A.T., and Parry, C.M.

Published
2001
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50. Terminating high-spin bands in 101Rh

Author

Timár, J., Gizon, J., Gizon, A., Zolnai, L., Nyakó, B.M., Căta-Danil, G., Bucurescu, D., Boston, A.J., Joss, D.T., Paul, E.S., Semple, A.T., O'Brien, N.J., Parry, C.M., Afanasjev, A.V., and Ragnarsson, I.

Published
1999
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