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1. Detailed study of the decay of $^{21}$Mg

Author

Jensen, E. A. M., Nielsen, S. T., Andreyev, A., Borge, M. J. G., Cederkäll, J., Fraile, L. M., Fynbo, H. O. U., Harkness-Brennan, L. J., Jonson, B., Judson, D. S., Kirsebom, O. S., Lică, R., Lund, M. V., Madurga, M., Marginean, N., Mihai, C., Page, R. D., Perea, Á., Riisager, K., and Tengblad, O.

Subjects
Nuclear Experiment
Abstract

Beta-delayed proton and gamma emission in the decay of $^{21}$Mg has been measured at ISOLDE, CERN with the ISOLDE Decay Station (IDS) set-up. The existing decay scheme is updated, in particular what concerns proton transitions to excited states in $^{20}$Ne. Signatures of interference in several parts of the spectrum are used to settle spin and parity assignments to highly excited states in $^{21}$Na. The previously reported $\beta$p$\alpha$ branch is confirmed. A half-life of 120.5(4) ms is extracted for $^{21}$Mg. The revised decay scheme is employed to test mirror symmetry in the decay and to extract the beta strength distribution of $^{21}$Mg that is compared with theory., Comment: 14 pages, 10 figures. This version includes the same content as the published, open-access version. In this version, details about the conditions during the experiment have been expanded (section 2), scattered claims and comments have been clarified and columns containing particle (lab) energies have been added to tables 1 and 2

Published
2024
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2. An innovative Superconducting Recoil Separator for HIE-ISOLDE

Author

Martel, I., Acosta, L., Aguado, J.L., Assie, M., Al-Aqeel, M.A.M., Ballarino, A., Barna, D., Berjillos, R., Bonora, M., Bontoiu, C., Borge, M.J.G., Briz, J.A., Bustinduy, I., Bottura, L., Catalina-Medina, L., Catford, W., Cederkäll, J., Davinson, T., de Angelis, G., Devred, A., Díaz-Martín, C., Ekelöf, T., Felice, H., Fynbo, H., Foussat, A.P., Florin, R., Freeman, S.J., Gaffney, L., García-Ramos, C., Gentini, L., Gonzalez-Cordero, C.A., Guazzoni, C., Haziot, A., Heinz, A., Jimenez, J.M., Johnston, K., Jonson, B., Kirby, G., Kirby, O., Kurtukian-Nieto, T., Labiche, M., Liebsch, M., Losasso, M., Laird, A., Muñoz, J.L., Nara Singh, B.S., Neyens, G., Napiorkowski, P.J., O'Donnell, D., Page, R.D., Perini, D., Resta-López, J., Riddone, G., Rodriguez, J.A., Rodin, V., Russenschuck, S., Sharma, V.R., Salguero-Andújar, F., Sánchez-Segovia, J., Riisager, K., Sánchez-Benítez, A.M., Shepherd, B., Siesling, E., Smallcombe, J., Stanoiu, M., Tengblad, O., Thermeau, J.P., Tommasini, D., Uusitalo, J., Varnasseri, S., Welsch, C.P., and Willering, G.

Published
2023
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3. Diverse mechanisms in proton knockout reactions from the Borromean nucleus 17Ne

Author

Wamers, F., Lehr, C., Marganiec-Gałązka, J., Aksouh, F., Aksyutina, Yu., Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Fernández, P. Díaz, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Weick, H., and Wimmer, C.

Published
2023
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4. A new Time-of-flight detector for the R3B setup

Author

Heil, M., Kelić-Heil, A., Bott, L., Almusidi, T., Alvarez-Pol, H., Atar, L., Atkins, L., Aumann, T., Benlliure, J., Boretzky, K., Brückner, B., Cabanelas, P., Caesar, C., Casarejos, E., Cederkall, J., Chulkov, L., Corsi, A., Dueñas, J., Erbacher, P., Rodriguez, S. Escribano, Falduto, A., Feijoo, M., Frotscher, A., Frühauf, J., Gašparić, I., Borge, M. J. G., Gerbig, J., Gernhäuser, R., Gilbert, M., Glorius, J., Gnoffo, B., Göbel, K., Caamaño, D. Gonzalez, Grein, A., Hartig, A.-L., Heggen, H., Heine, M., Heinz, A., Holl, M., Homm, I., Horvat, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kamenyero, A., Khodaparast, A., Kiselev, O., Klenze, P., Knösel, M., Koch, K., Körper, D., Kröll, T., Kurtulgil, D., Kurz, N., Löher, B., Langer, C., Lehr, C., Litvinov, Y., Liu, H., Morales, S. Murillo, Nácher, E., Nilsson, T., Park, J., Paschalis, S., Pellegri, L., Perea, A., Petri, M., Pohl, T., Ponnath, L., Popočovski, R., Reifarth, R., Rhee, H.-B., Sanchez, J. L. Rodriguez, Rossi, D., Sürder, C., Sánchez-Benítez, A. M., Savran, D., Scheit, H., Simon, H., Slavkovská, Z., Storck-Dutine, S., Sun, Y., Törnqvist, H. T., Tanaka, J., Tengblad, O., Thomas, B., Varga, L., Volknandt, M., Wagner, V., Wamers, F., and Zanetti, L.

Published
2022
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5. Measurement of Nuclear Interaction Cross Sections towards Neutron-Skin Thickness Determination

Author

Ponnath, L., primary, Aumann, T., additional, Bertulani, C.A., additional, Gernhäuser, R., additional, Heil, M., additional, Almusidi, T., additional, Alvarez-Pol, H., additional, Atar, L., additional, Atkins, L., additional, Ayyad, Y., additional, Benlliure, J., additional, Boretzky, K., additional, Borge, M.J.G., additional, Bott, L.T., additional, Bruni, G., additional, Brückner, B., additional, Cabanelas, P., additional, Caesar, C., additional, Casarejos, E., additional, Cederkall, J., additional, Corsi, A., additional, Cortina-Gil, D., additional, Dueñas, J.A., additional, Duer, M., additional, Elekes, Z., additional, Escribano Rodriguez, S., additional, Fabbietti, L., additional, Falduto, A., additional, Feijoo, M., additional, Feijoo Fontan, M., additional, Fonseca, L.M., additional, Frotscher, A., additional, Galaviz, D., additional, Galiana, E., additional, García-Jiménez, G., additional, Gašparic̀, I., additional, Geraci, E.I., additional, Gillibert, A., additional, Gnoffo, B., additional, González Caamaño, D., additional, Graña González, A., additional, Göbel, K., additional, Hartig, A.-L., additional, Heinz, A., additional, Hensel, T., additional, Holl, M., additional, Horvat, A., additional, Jedele, A., additional, Jelavic̀ Malenica, D., additional, Jenegger, T., additional, Johansson, H.T., additional, Jonson, B., additional, Kalantar-Nayestanaki, N., additional, Kelic-Heil, A., additional, Kiselev, O.A., additional, Klenze, P., additional, Kresan, D., additional, Kröll, T., additional, Kudaibergenova, E., additional, Kurtulgil, D., additional, Körper, D., additional, Labiche, M., additional, Langer, C., additional, Lihtar, I., additional, Litvinov, Yu.A., additional, Löher, B., additional, Mayer, J., additional, Murillo Morales, S., additional, Nacher, E., additional, Nilsson, T., additional, Obertelli, A., additional, Panin, V., additional, Park, J., additional, Paschalis, S., additional, Perea, A., additional, Petri, M., additional, Pirrone, S., additional, Pohl, T., additional, Reifarth, R., additional, Rhee, H.-B., additional, Rodriguez-Sanchez, J.L., additional, Rose, L., additional, Rossi, D.M., additional, Russotto, P., additional, Savran, D., additional, Scheit, H., additional, Simon, H., additional, Storck-Dutine, S., additional, Stott, A.M., additional, Sürder, C., additional, Taniuchi, R., additional, Tengblad, O., additional, Teubig, P., additional, Trache, L., additional, Trimarchi, M., additional, Törnqvist, H.T., additional, Varga, L., additional, Wagner, V., additional, and Wamers, F., additional

Published
2024
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6. Strong Coupling Effects on Near-Barrier 15C + 208Pb Elastic Scattering

Author

Távora, V.G., primary, Ovejas, J.D., additional, Martel, I., additional, Keeley, N., additional, Acosta, L., additional, Borge, M.J.G., additional, Tengblad, O., additional, Arokiaraj, A.A., additional, Babo, M., additional, Cederkall, J., additional, Ceylan, N., additional, Di Pietro, A., additional, Fernández, J.P., additional, Figuera, P., additional, Fraile, L., additional, Fynbo, H.O.U., additional, Galaviz, D., additional, García-Ramos, C., additional, Honório, R., additional, Jensen, J.H., additional, Jonson, B., additional, Kemper, K.W., additional, Knyazev, A., additional, Kotak, R., additional, Kurtukian-Nieto, T., additional, Madurga, M., additional, Marquínez-Durán, G., additional, Munch, M., additional, Orduz, A.K., additional, Park, J., additional, Peralta, L., additional, Perea, A., additional, Pérez-Alvarez, T., additional, Raabe, R., additional, Renaud, M., additional, Riisager, K., additional, Rusek, K., additional, Sánchez-Benítez, A.M., additional, Sánchez-Segovia, J., additional, Teubig, P., additional, Viñals, S., additional, Wolińska-Cichocka, M., additional, Wolski, R., additional, and Yang, J., additional

Published
2024
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7. Study of bound states in ¹⁰Be by one neutron removal reactions of ¹¹Be

Author

Johansen, Jacob G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhäuser, R., Jonson, B., Koldste, G. T., Konki, J., Kröll, T., Krücken, R., Mücher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., De Witte, H., Johansen, Jacob G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhäuser, R., Jonson, B., Koldste, G. T., Konki, J., Kröll, T., Krücken, R., Mücher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., and De Witte, H.

Abstract

The bound states of ¹⁰Be have been studied by removing single neutrons from ¹¹Be nuclei. A 2.8 MeV u⁻¹ beam of ¹¹Be was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in ¹⁰Be were identified by gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in ¹⁰Be. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the 2⁺₂ state is observed, which which may indicate the presence of multi-step processes at our beam energy.

Published
2024

8. Diverse mechanisms in proton knockout reactions from the Borromean nucleus 17Ne

Author

Chalmers University of Technology, Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Swedish Research Council, Ministerio de Ciencia e Innovación (España), Department of Energy (US), Jonson, B. [0000-0002-9697-9115], Wamers, F., Lehr, C., Marganiec-Gałązka, J., Aksouh, F., Aksyutina, Yu, Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Fernández, P. Díaz, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O.U., Galaviz, D., Geissel, H., Heil, M., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Weick, H., Wimmer, C., Chalmers University of Technology, Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Swedish Research Council, Ministerio de Ciencia e Innovación (España), Department of Energy (US), Jonson, B. [0000-0002-9697-9115], Wamers, F., Lehr, C., Marganiec-Gałązka, J., Aksouh, F., Aksyutina, Yu, Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., García Borge, María José, Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Fernández, P. Díaz, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O.U., Galaviz, D., Geissel, H., Heil, M., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, Olof, Weick, H., and Wimmer, C.

Abstract

Nucleon knockout experiments using beryllium or carbon targets reveal a strong dependence of the quenching factors, i.e., the ratio (R s) of theoretical to the experimental spectroscopic factors (C 2S), on the proton-neutron asymmetry in the nucleus under study. However, this dependence is greatly reduced when a hydrogen target is used. To understand this phenomenon, exclusive 1H (17Ne , 2p16F) and inclusive 12C(17Ne,2p16F)X , 12C (17Ne , 16F) X as well as 1H (17Ne , 16F) X (X-denotes undetected reaction products) reactions with 16F in the ground and excited states were analysed. The longitudinal momentum distribution of 16F and the correlations between the detached protons were studied. In the case of the carbon target, there is a significant deviation from the predictions of the eikonal model. The eikonal approximation was used to extract spectroscopic factor values C 2S . The experimental C 2S value obtained with C target is markedly lower than that for H target. This is interpreted as rescattering due to simultaneous nucleon knockout from both reaction partners, 17Ne and 12C .

Published
2023

9. Measurements of the Reaction Cross Sections of Neutron-rich Sn Isotopes at the R\(^3\)B Setup

Author

Kudaibergenova, E., primary, Lihtar, I., additional, Feijoo-Fontán, M., additional, Aumann, T., additional, Bertulani, C.A., additional, Gašparić, I., additional, Horvat, A., additional, Panin, V., additional, Rodríguez-Sánchez, J.L., additional, Rossi, D., additional, Storck-Dutine, S., additional, Törnqvist, H.T., additional, Alvarez-Pol, H., additional, Atar, L., additional, Benlliure, J., additional, Boretzky, K., additional, Bott, L.T., additional, Caesar, C., additional, Casarejos, E., additional, Cederkall, J., additional, Chatillon, A., additional, Cortina-Gil, D., additional, de Filippo, E., additional, Dickel, T., additional, Duer, M., additional, Falduto, A., additional, Fonseca, L.M., additional, Galaviz, D., additional, García-Jiménez, G., additional, Ge, Z., additional, Geraci, E.I., additional, Gernhüser, R., additional, Gnoffo, B., additional, Graña-González, A., additional, Göbel, K., additional, Hartig, A.L., additional, Heil, M., additional, Heinz, A., additional, Hensel, T., additional, Holl, M., additional, Jedele, A., additional, Jelavic-Malenica, D., additional, Jenegger, T., additional, Ji, L., additional, Johansson, H.T., additional, Jonson, B., additional, Kalantar-Nayestanaki, N., additional, Kelić-Heil, A., additional, Kiselev, O.A., additional, Klenze, P., additional, Körper, D., additional, Kröll, T., additional, Litvinov, Yu.A., additional, Löher, B., additional, Martorana, N.S., additional, Morfouace, P., additional, Murillo-Morales, S., additional, Nociforo, C., additional, Obertelli, A., additional, Paschalis, S., additional, Perea, A., additional, Petri, M., additional, Pietri, S., additional, Pirrone, S., additional, Ponnath, L., additional, Rhee, H.B., additional, Rose, L., additional, Russotto, P., additional, Savran, D., additional, Scheit, H., additional, Simon, H., additional, Simon, J.P., additional, Stott, A.M., additional, Sun, Y., additional, Symochko, D., additional, Sürder, C., additional, Taieb, J., additional, Taniuchi, R., additional, Tengblad, O., additional, Velardita, S., additional, and Wamers, F., additional

Published
2024
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10. Detailed study of the decay of 21Mg.

Author

Jensen, E. A. M., Nielsen, S. T., Andreyev, A., Borge, M. J. G., Cederkäll, J., Fraile, L. M., Fynbo, H. O. U., Harkness-Brennan, L. J., Jonson, B., Judson, D. S., Kirsebom, O. S., Lică, R., Lund, M. V., Madurga, M., Marginean, N., Mihai, C., Page, R. D., Perea, A., Riisager, K., and Tengblad, O.

Subjects
EXCITED states, BETA distribution, MIRROR symmetry, PROTONS
Abstract

Beta-delayed proton and gamma emission in the decay of 21 Mg has been measured at ISOLDE, CERN with the ISOLDE Decay Station (IDS) set-up. The existing decay scheme is updated, in particular what concerns proton transitions to excited states in 20 Ne. Signatures of interference in several parts of the spectrum are used to settle spin and parity assignments to highly excited states in 21 Na. The previously reported β p α branch is confirmed. A half-life of 120.5(4) ms is extracted for 21 Mg. The revised decay scheme is employed to test mirror symmetry in the decay and to extract the beta strength distribution of 21 Mg that is compared with theory. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Author

Di Pietro, A, primary, Spartá, R, additional, Figuera, P, additional, Tengblad, O, additional, Moro, A, additional, Lei, J, additional, Fernandez Garcia, JP, additional, Acosta, L, additional, Jonson, B, additional, Borge, MJ, additional, Cederkäll, J, additional, Davinson, T, additional, Ovejas, JD, additional, Fraile, L, additional, Galaviz, D, additional, Halkjaer Jensen, J, additional, La Cognata, M, additional, Martel, I, additional, Perea, A, additional, Sanchez Benitez, A, additional, Soić, N, additional, and Vignales, S, additional

Published
2023
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12. Diverse mechanisms in proton knockout reactions from the Borromean nucleus $$^{17}\text {Ne}$$

Author

Wamers, F., primary, Lehr, C., additional, Marganiec-Gałązka, J., additional, Aksouh, F., additional, Aksyutina, Yu., additional, Alvarez-Pol, H., additional, Atar, L., additional, Aumann, T., additional, Beceiro-Novo, S., additional, Bertulani, C. A., additional, Boretzky, K., additional, Borge, M. J. G., additional, Caesar, C., additional, Chartier, M., additional, Chatillon, A., additional, Chulkov, L. V., additional, Cortina-Gil, D., additional, Fernández, P. Díaz, additional, Emling, H., additional, Ershova, O., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Galaviz, D., additional, Geissel, H., additional, Heil, M., additional, Holl, M., additional, Johansson, H. T., additional, Jonson, B., additional, Karagiannis, C., additional, Kiselev, O. A., additional, Kratz, J. V., additional, Kulessa, R., additional, Kurz, N., additional, Langer, C., additional, Lantz, M., additional, Le Bleis, T., additional, Lemmon, R., additional, Litvinov, Yu. A., additional, Mahata, K., additional, Müntz, C., additional, Nilsson, T., additional, Nociforo, C., additional, Ott, W., additional, Panin, V., additional, Paschalis, S., additional, Perea, A., additional, Plag, R., additional, Reifarth, R., additional, Richter, A., additional, Riisager, K., additional, Rodriguez-Tajes, C., additional, Rossi, D., additional, Savran, D., additional, Scheit, H., additional, Schrieder, G., additional, Schrock, P., additional, Simon, H., additional, Stroth, J., additional, Sümmerer, K., additional, Tengblad, O., additional, Weick, H., additional, and Wimmer, C., additional

Published
2023
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13. Diverse mechanisms in proton knockout reactions from the Borromean nucleus Ne-17

Author

Wamers, F., Lehr, C., Marganiec-Galazka, J., Aksouh, F., Aksyutina, Yu., Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Fernandez, P. Diaz, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, Mattias, Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Suemmerer, K., Tengblad, O., Weick, H., Wimmer, C., Wamers, F., Lehr, C., Marganiec-Galazka, J., Aksouh, F., Aksyutina, Yu., Alvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Fernandez, P. Diaz, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, Mattias, Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Suemmerer, K., Tengblad, O., Weick, H., and Wimmer, C.

Abstract

Nucleon knockout experiments using beryllium or carbon targets reveal a strong dependence of the quenching factors, i.e., the ratio (Rs) of theoretical to the experimental spectroscopic factors (C2S), on the proton-neutron asymmetry in the nucleus under study. However, this dependence is greatly reduced when a hydrogen target is used. To understand this phenomenon, exclusive H-1(Ne-17, 2p F-16) and inclusive C-12(Ne-17, 2p 1(6)F)X, 1(2)C(Ne-17, F-16)X as well as 1H(Ne-17,(16) F)X(X-denotes undetected reaction products) reactions with F-16 in the ground and excited states were anal- ysed. The longitudinal momentum distribution of F-16 and the correlations between the detached protons were studied. In the case of the carbon target, there is a significant deviation from the predictions of the eikonal model. The eikonal approximation was used to extract spectroscopic factor values (CS)-S-2. The experimental (CS)-S-2 value obtained with C target is markedly lower than that for H target. This is interpreted as rescattering due to simultaneous nucleon knockout from both reaction partners, Ne-17 and C-12.

Published
2023
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14. An innovative Superconducting Recoil Separator for HIE-ISOLDE

Author

Ministerio de Ciencia e Innovación (España), European Commission, Martel, I. [0000-0002-4895-2305], Martel, I., Acosta, L., Aguado, J. L., Assie, M., Al-Aqeel, M. A.M., Ballarino, A., Barna, D., Berjillos, R., Bonora, M., Bontoiu, C., García Borge, María José, Briz, José Antonio, Bustinduy, I., Bottura, L., Catalina-Medina, L., Catford, W., Cederkäll, J., Davinson, T., de Angelis, G., Devred, A., Díaz-Martín, C., Ekelöf, T., Felice, H., Fynbo, H., Foussat, A. P., Florin, R., Freeman, S. J., Gaffney, L., García-Ramos, C., Gentini, L., Gonzalez-Cordero, C. A., Guazzoni, C., Haziot, A., Heinz, A., Jimenez, J. M., Johnston, K., Jonson, B., Kirby, G., Kirby, O., Kurtukian-Nieto, T., Labiche, M., Liebsch, M., Losasso, M., Laird, A., Muñoz, J. L., Nara Singh, B. S., Neyens, G., Napiorkowski, P. J., O'Donnell, D., Page, R. D., Perini, D., Resta-López, J., Riddone, G., Rodriguez, J. A., Rodin, V., Russenschuck, S., Sharma, V. R., Salguero-Andújar, F., Sánchez-Segovia, J., Riisager, K., Sánchez-Benítez, A. M., Shepherd, B., Siesling, E., Smallcombe, J., Stanoiu, M., Tengblad, Olof, Thermeau, J. P., Tommasini, D., Uusitalo, J., Varnasseri, S., Welsch, C. P., Willering, G., Ministerio de Ciencia e Innovación (España), European Commission, Martel, I. [0000-0002-4895-2305], Martel, I., Acosta, L., Aguado, J. L., Assie, M., Al-Aqeel, M. A.M., Ballarino, A., Barna, D., Berjillos, R., Bonora, M., Bontoiu, C., García Borge, María José, Briz, José Antonio, Bustinduy, I., Bottura, L., Catalina-Medina, L., Catford, W., Cederkäll, J., Davinson, T., de Angelis, G., Devred, A., Díaz-Martín, C., Ekelöf, T., Felice, H., Fynbo, H., Foussat, A. P., Florin, R., Freeman, S. J., Gaffney, L., García-Ramos, C., Gentini, L., Gonzalez-Cordero, C. A., Guazzoni, C., Haziot, A., Heinz, A., Jimenez, J. M., Johnston, K., Jonson, B., Kirby, G., Kirby, O., Kurtukian-Nieto, T., Labiche, M., Liebsch, M., Losasso, M., Laird, A., Muñoz, J. L., Nara Singh, B. S., Neyens, G., Napiorkowski, P. J., O'Donnell, D., Page, R. D., Perini, D., Resta-López, J., Riddone, G., Rodriguez, J. A., Rodin, V., Russenschuck, S., Sharma, V. R., Salguero-Andújar, F., Sánchez-Segovia, J., Riisager, K., Sánchez-Benítez, A. M., Shepherd, B., Siesling, E., Smallcombe, J., Stanoiu, M., Tengblad, Olof, Thermeau, J. P., Tommasini, D., Uusitalo, J., Varnasseri, S., Welsch, C. P., and Willering, G.

Abstract

The ISOLDE Scientific Infrastructure at CERN offers a unique range of post-accelerated radioactive beams. The scientific program can be improved with the “Isolde Superconducting Recoil Separator” (ISRS), an innovative spectrometer able to deliver unprecedented (A, Z) resolution. In this paper we present an overview of the physics and ongoing technical developments.

Published
2023

15. Unveiling the two-proton halo character of 17Ne : Exclusive measurement of quasi-free proton-knockout reactions

Author

Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu, Álvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C. A., Boretzky, K., Borge, M. J.G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Díaz Fernández, P., Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O.U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D. H.H., Holl, M., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu A., Löher, B., Mahata, K., Marganiec-Galązka, J., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Weick, H., and Wimmer, C.

Abstract

The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F→15⁎O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including γ decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l=0 and l=2 motion of the valence protons in 17Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Published
2022

16. Unveiling the two-proton halo character of Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author

Lehr, C., Wamers, F., Aksouh, F., Aksyutina, Yu., Álvarez-Pol, H., Atar, L., Aumann, T., Beceiro-Novo, S., Bertulani, C.A., Boretzky, K., Borge, M.J.G., Caesar, C., Chartier, M., Chatillon, A., Chulkov, L.V., Cortina-Gil, D., Díaz Fernández, P., Emling, H., Ershova, O., Fraile, L.M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Heil, M., Heine, M., Hoffmann, D.H.H., Holl, M., Johansson, H.T., Jonson, B., Karagiannis, C., Kiselev, O.A., Kratz, J.V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu.A., Löher, B., Mahata, K., Marganiec-Galązka, J., Müntz, C., Nilsson, T., Nociforo, C., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Savran, D., Scheit, H., Schrieder, G., Schrock, P., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Weick, H., and Wimmer, C.

Abstract

The proton drip-line nucleus $^{17}$Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the $^{17}$Ne(p,2p)16F→15⁎O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of $^{16}$F into $^{15}$O (including γ decays from excited states) and a proton, as well as the $^{15}$O+p relative-energy spectrum and the $^{16}$F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l=0 and l=2 motion of the valence protons in $^{17}$Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that $^{17}$Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the $^{15}$O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Published
2022

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