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39 results on '"Cortina-Gil D."'

1. Observation and spectroscopy of proton-unbound nucleus $^{21}$Al

Author

Kostyleva, D., Xu, X. -D., Mukha, I., Acosta, L., Bajzek, M., Casarejos, E., Ciemny, A. A., Cortina-Gil, D., Dominik, W., Dueñas, J. A., Espino, J. M., Estradé, A., Farinon, F., Fomichev, A., Geissel, H., Gómez-Camacho, J., Gorshkov, A., Grigorenko, L. V., Janas, Z., Kamiński, G., Kiselev, O., Knöbel, R., Korsheninnikov, A. A., Krupko, S., Kuich, M., Kurz, N., Litvinov, Yu. A., Marquinez-Durán, G., Martel, I., Mazzocchi, C., Nikolskii, E. Yu., Nociforo, C., Ordúz, A. K., Pfützner, M., Pietri, S., Pomorski, M., Prochazka, A., Rodríguez-Tajes, C., Rymzhanova, S., Sánchez-Benítez, A. M., Scheidenberger, C., Simon, H., Sitar, B., Slepnev, R., Stanoiu, M., Strmen, P., Sümmerer, K., Szarka, I., Takechi, M., Tanaka, Y. K., Weick, H., Winfield, J. S., Woods, P. J., and Zhukov, M. V.

Subjects
Nuclear Experiment
Abstract

We report on the observation of previously-unknown isotope $^{21}$Al, the first unbound aluminum isotope located beyond the proton dripline. The $^{21}$Al nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of all decay products with micro-strip silicon detectors. The 1p-emission processes were studied by analyses of the measured angular correlations of decay products $^{20}$Mg+p. The 1p-decay energies of ground and low-lying excited states of $^{21}$Al, its mass excess and proton separation energy value $S_p$=$-1.1(1)$ MeV were determined., Comment: 6 pages, 7 figures

Published
2024
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2. Study of multinucleon knockout reactions of exotic nuclei in the region of Sn

Author

Feijoo-Fontán M., Kudaibergenova E., Liblar I., Gasparic I., Horvat A., Rodriguez-Sanchez J.L., Panin V., Alvarez-Pol H., Atar L., Aumann T., Benlliure J., Boretzky K., Borge M.J.G., Bott L.T., Caesar C., Casarejos E., Cederkall J., Chatillon A., Cortina-Gil D., Filippo E., Dickel T., Duer M., Falduto A., Galaviz D., García-Jiménez G., Ge Z., Geraci E.I., Gernhäuser R., Gnoffo B., Graña-González A., Göbel K., Haettner E., Hartig A.L., Heil M., Heinz A., Hensel T., Holl M., Hornung C., Jedele A., Jelavic-Malenica D., Jenegger T., Ji L., Johansson H.T., Kalantar-Nayestanaki N., Kazantseva E., Kelic-Heil A., Kiselev O.A., Klenze P., Knoebel R., Körper D., Kröll T., Löher B., Martorana N.S., Milhomens da Fonseca L., Morfouace P., Mukha I., Murillo-Morales S., Nácher E., Nociforo C., Obertelli A., Paschalis S., Perea A., Petri M., Pietri S., Pirrone S., Ponnath L., Rhee H.B., Rose L., Rossi D.M., Russotto P., Savran D., Scheidenberger C., Simon H., Simon J.P., Storck-Dunite S., Stott A., Sun Y., Symochko D., Sürder C., Taïeb J., Taniuchi R., Tengblad O., Törnqvist H.T., Velardita S., Wamers F., Weick H., and Zhao J.

Subjects
Physics, QC1-999
Abstract

The experimental data collected during the S515 experiment performed by the R3B collaboration at GSI/FAIR represent a great opportunity to investigate nucleon knockout reactions of exotic nuclei in the region of Sn using complete kinematics measurements. These cross sections can be used in the future to investigate the quenching in the knockout of the minority species (neutrons or protons) in nuclei far from stability. Some of the arguments put forward are the underestimation of the knockout of deeply bound nucleons, final state interactions or the role of short-range correlations (SRC). Recently, several works based on inclusive measurements have shown that these SRCs could reduce the single nucleon knockout cross sections by around 50%, depending on the neutron excess (N/Z) of the initial projectile. The S515 data can help us to go further in this investigation because it allows to correlate the knockout cross sections of one, two or more nucleons with the number of protons and neutrons emitted from the target and which can be detected by the CALIFA and NeuLAND detectors, respectively, and perform complete kinematical studies on the nature of the event (SRC, evaporation, emission of clusters, final-state interactions...). Here the results obtained for the charge distribution of reaction residues are presented, which is one of the first steps of the still on-going analysis.

Published
2023
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3. Fragmentation-induced fission reactions of 236U in inverse kinematics to investigate the pre-fragment angular momentum parameterizations

Author

Rodríguez-Sánchez J.L., Feijoo M., Benlliure J., Chatillon A., Taïeb J., Audouin L., Alvarez-Pol H., Ayyad Y., Bélier G., Boutoux G., Caamaño M., Casarejos E., Cortina-Gil D., Farget F., Fernández-Domínguez B., Gorbinet T., Grente L., Heinz A., Johansson H.T., Jurado B., Kelić-Heil A., Körper D., Kurz N., Laurent B., Lindberg S., Löher B., Martin J.-F., Nociforo C., Paradela C., Pietri S., Ramos D., Rodríguez-Tajes C., Simon H., Törnqvist H.T., Voss B., Weick H., and Yan Y.

Subjects
Physics, QC1-999
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. The collected data were used to constrain dynamic and nuclear structure parameters of different de-excitation models, such as ABLA and GEF, but the data can also be used to constrain the parameterizations describing the pre-fragment properties after the nuclear collision, such as the angular momentum gained by the pre-fragment. In this work, the fissioning system yields are compared to calculations assuming different parameterizations for modeling the angular momentum gained by the compound nuclei. Our findings indicate that the parameterizations utilized by abrasion models clearly underestimate the angular momentum, resulting in the underestimation of the production of lighter fissioning systems.

Published
2023
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4. Study of (p,2p) fission reactions in inverse kinematics using the R3B set-up

Author

García-Jiménez G., Alvarez-Pol H., Graña-González A., Rodríguez-Sánchez J.L., Benlliure J., Cortina-Gil D., Atar L., Audouin L., Authelet G., Besteiro A., Blanchon G., Boretzky K., Borge M.J.G., Cabanelas P., Casarejos E., Cederkall J., Chatillon A., Corsi A., Feijoo M., De Filippo E., Galaviz D., Gasparic I., Geraci E., Gernhäuser R., Gnoffo B., Heil M., Heinz A., Hensel T., Holl M., Jelavic Malenica D., Jenegger T., Ji L., Johansson H.T., Kiselev O.A., Klenze P., Knyazev A., Körper D., Kröll T., Lithar I., Litvinov Y.A., Löher B., Martorana N. S., Morfouace P., Mücher D., Murillo-Morales S., Obertelli A., Panin V., Park J., Paschalis S., Perea A., Petri M., Pirrone S., Ponnath L., Revel A., Rhee H., Rose L., Rossi D.M., Russotto P., Simon H., Stott A., Sun Y., Sürder C., Taïeb J., Taniuchi R., Tengblad O., Törnqvist H.T., Trimarchi M., Velardita S., Vesic J., and Voss B.

Subjects
Physics, QC1-999
Abstract

A new experimental fission approach is presented in the context of the R3B (Reactions with Relativistic Radioactive Beams) collaboration, at the GSI/FAIR facility, in which knockout reactions in inverse kinematics are used to induce fission of 238U that will allow to characterise the excitation energy of the fission process and all the fission products. The CALIFA (CALorimeter for In-Flight detection of γ-rays and high energy charged pArticles) calorimeter, a key part of the R3B set-up, is used to reconstruct the momenta of the two protons from the (p, 2p) reactions. Preliminary results show that kinematic variables and first estimates for nucleon-removal cross sections are well reconstructed and in good agreement with other experimental measurements.

Published
2023
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5. Fission studies in inverse kinematics with the R3B setup

Author

Graña-González A., Rodríguez-Sánchez J.L., Benlliure J., García-Jiménez G., Alvarez-Pol H., Cortina-Gil D., Atar L., Audouin L., Authelet G., Besteiro A., Blanchon G., Boretzky K., Borge M.J.G., Cabanelas P., Casarejos E., Cederkall J., Chatillon A., Corsi A., Feijoo M., De Filippo E., Galaviz D., Gasparic I., Geraci E., Gernhäuser R., Gnoffo B., Heil M., Heinz A., Hensel T., Holl M., Jelavic Malenica D., Jenegger T., Ji L., Johansson H., Kiselev O.A., Klenze P., Knyazev A., Körper D., Kröll T., Lihtar I., Litvinov Y., Löher B., Martorana N.S., Morfouace P., Mücher D., Murillo Morales S., Obertelli A., Panin V., Park J., Paschalis S., Perea A., Petri M., Pirrone S., Ponnath L., Revel A., Rhee H.-B., Rose L., Rossi D.M., Russotto P., Simon H., Stott A., Sun Y., Sürder C., Taïeb J., Taniuchi R., Tengblad O., Törnqvist H.T., Trimarchi M., Velardita S., Vesic J., and Voss B.

Subjects
Physics, QC1-999
Abstract

Nuclear fission is a complex dynamical process, whose description involves the coupling between intrinsic and collective degrees of freedom, as well as different quantum-mechanical phenomena. For this reason, to this day it still lacks a satisfactory and complete microscopic description. In addition to the importance of describing fission itself, studies of the r-process in astrophysics depend on fission observables to constrain the theoretical models that explain the isotopic abundances in the Universe. To improve on the existing data, fission reactions of heavy nuclei in inverse kinematics are produced in quasi-free (p,2p) scattering reactions, which induce fission through particle-hole excitations that can range from few to tens of MeV. In order to study the evolution of the fission yields with temperature, the excitation energy of the fissioning system must be reconstructed, which is possible by measuring the four-momenta of the two outgoing protons. Performing this kind of experiment requires a complex experimental setup, providing full isotopic identification of both fission fragments and an accurate measurement of the momenta of the two outgoing protons. This was realized recently at the GSI/FAIR facility and some of the results obtained for the charge distributions are presented in this work.

Published
2023
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6. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup

Author

Chatillon A., Boutoux G., Gorbinet T., Grente L., Martin J.-F., Pellereau E., Taieb J., Alvarez-Pol H., Audouin L., Ayyad Y., Bélier G., Benlliure J., Caamaño M., Casarejos E., Cortina-Gil D., Ebran A., Farget F., Fernández-Domínguez B., Heinz A., Johansson H. T., Jurado B., Kelić-Heil A., Kurz N., Laurent B., Loeher B., Nociforo C., Paradela C., Pietri S., Prochazka A., Ramos D., Rodríguez-Sànchez J. L., Rodriguez C., Rossi D., Simon H., Tassan-Got L., Toernqvist H., Vargas J., Voss B., and Weick H.

Subjects
Physics, QC1-999
Abstract

Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields.

Published
2023
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7. A new approach for deducing rms proton radii from charge-changing reactions of neutron-rich nuclei and the reaction-target dependence

Author

Zhang, J. -C., Sun, B. -H., Tanihata, I., Kanungo, R., Scheidenberger, C., Terashima, S., Wang, Feng, Ameil, F., Atkinson, J., Ayyad, Y., Bagchi, S., Cortina-Gil, D., Dillmann, I., Estrade, A., Evdokimov, A., Farinon, F., Geissel, H., Guastalla, G., Janik, R., Kaur, S., Knobel, R., Kurcewicz, J., Litvinov, Yu. A., Marta, M., Mostazo, M., Mukha, I., Nociforo, C., Ong, H. J., Pietri, S., Prochazka, A., Sitar, B., Strmen, P., Takechi, M., Tanaka, J., Vargas, J., Weick, H., Winfield, J. S., and Collaboration, the Super-FRS Experiment

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We report the charge-changing cross sections ($\sigma_{\text{cc}}$) of 24 $p$-shell nuclides on both hydrogen and carbon at about 900$A$ MeV, of which $^{8,9}$Li, $^{10\textendash12}$Be, $^{10,14,15}$B, $^{14,15,17\textendash22}$N and $^{16}$O on hydrogen and $^{8,9}$Li on carbon are for the first time. Benefiting from the data set,we found a new and robust relationship between the scaling factor of the Glauber model calculations and the separation energies of the nuclei of interest on both targets.This allows us to deduce proton radii ($R_p$) for the first time from the cross sections on hydrogen. Nearly identical $R_p$ values are deduced from both target data for the neutron-rich carbon isotopes, however, the $R_p$ from the hydrogen target is systematically smaller in the neutron-rich nitrogen isotopes.This calls for further experimental and theoretical investigations., Comment: 5 pages, 3 figures

Published
2024
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8. Quasi-free (p,2p) reactions in inverse kinematics for studying the fission yield dependence on temperature

Author

Graña-González, A., Rodríguez-Sánchez, J. L., Benlliure, J., García-Jiménez, G., Alvarez-Pol, H., Cortina-Gil, D., Atar, L., Audouin, L., Authelet, G., Besteiro, A., Blanchon, G., Boretzky, K., Cabanelas, P., Casarejos, E., Cederkall, J., Chatillon, A., Corsi, A., Feijoo, M., Galaviz, D., Gasparic, I., Gernhäuser, R., Heil, M., Heinz, A., Holl, M., Jenegger, T., Ji, L., Johansson, H. T., Kiselev, O. A., Klenze, P., Knyazev, A., Körper, D., Kröll, T., Lihtar, I., Litvinov, Y. A., Löher, B., Morfouace, P., Mücher, D., Murillo-Morales, S., Obertelli, A., Panin, V., Park, J., Paschalis, S., Perea, A., Petri, M., Pirrone, S., Ponnath, L., Revel, A., Rhee, H. B., Rose, L., Rossi, D. M., Russotto, P., Simon, H., Stott, A., Sun, Y., Sürder, C., Taïeb, J., Taniuchi, R., Tengblad, O., Törnqvist, H. T., Velardita, S., Vesic, J., and Voss, B.

Subjects
Nuclear Experiment
Abstract

Despite the recent experimental and theoretical progress in the investigation of the nuclear fission process, a complete description still represents a challenge in nuclear physics because it is a very complex dynamical process, whose description involves the coupling between intrinsic and collective degrees of freedom, as well as different quantum-mechanical phenomena. To improve on the existing data on nuclear fission, we produce fission reactions of heavy nuclei in inverse kinematics by using quasi-free (p,2p) scattering, which induce fission through particle-hole excitations that can range from few to ten's of MeV. The measurement of the four-momenta of the two outgoing protons allows to reconstruct the excitation energy of the fissioning compound nucleus and therefore to study the evolution of the fission yields with temperature. The realization of this kind of experiment requires a complex experimental setup, providing full isotopic identification of both fission fragments and an accurate measurement of the momenta of the two outgoing protons. This was realized recently at the GSI/FAIR facility and here some preliminary results are presented., Comment: 6 pages, 2 figures, FAIRNESS 2022. arXiv admin note: text overlap with arXiv:2210.04741

Published
2022

9. Comprehensive investigation of fission yields by using spallation- and (p,2p)-induced fission reactions in inverse kinematics

Author

Rodríguez-Sánchez, J. L., Graña-González, A., Benlliure, J., Chatillon, A., García-Jiménez, G., Taieb, J., Alvarez-Pol, H., Atar, L., Audouin, L., Authelet, G., Besteiro, A., Blanchon, G., Boretzky, K., Cabanelas, P., Casarejos, E., Cederkall, J., Cortina-Gil, D., Corsi, A., De Filippo, E., Feijoo, M., Galaviz, D., Gasparic, I., Gernhäuser, R., Haettner, E., Heil, M., Heinz, A., Holl, M., Jenegger, T., Ji, L., Johansson, H. T., Kelić-Heil, A., Kiselev, O. A., Klenze, P., Knyazev, A., Körper, D., Kröll, T., Lihtar, I., Litvinov, Y. A., Löher, B., Martorana, N., Morfouace, P., Mücher, D., Morales, S. Murillo, Obertelli, A., Panin, V., Park, J., Paschalis, S., Perea, A., Petri1, M., Pietri, S., Pirrone, S., Ponnath, L., Revel, A., Rhee, H. -B., Rose, L., Ross, D. M., Russotto, P., Simon, H., Stott, A., Sun, Y., Sürder, C., Taniuchi, R., Tengblad, O., Törnqvist, H. T., Trimarchi, M., Velardita, S., Vesic, J., Voss, B., and Weick, H.

Subjects
Nuclear Experiment
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. To go a step further, we propose now to induce fission by the use of quasi-free (p,2p) scattering reactions in inverse kinematics, which allows us to reconstruct the excitation energy of the compound fissioning system by using the four-momenta of the two outgoing protons. Therefore, this new approach might permit to correlate the excitation energy with the charge and mass distributions of the fission fragments and with the fission probabilities, given for the first time direct access to the simultaneous measurement of the fission yield dependence on temperature and fission barrier heights of exotic heavy nuclei, respectively. The first experiment based on this methodology was realized recently at the GSI/FAIR facility and a detailed description of the experimental setup is given here., Comment: 4 pages, 15th International Conference on Nuclear Data for Science and Technology (ND2022)

Published
2022
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10. Proton distribution radii of $^{16-24}$O: signatures of new shell closures and neutron skin

Author

Kaur, S., Kanungo, R., Horiuchi, W., Hagen, G., Holt, J. D., Hu, B. S., Miyagi, T., Suzuki, T., Ameil, F., Atkinson, J., Ayyad, Y., Bagchi, S., Cortina-Gil, D., Dillmann, I., Estradé, A., Evdokimov, A., Farinon, F., Geissel, H., Guastalla, G., Janik, R., Knöbel, R., Kurcewicz, J., Litvinov, Yu. A., Marta, M., Mostazo, M., Mukha, I., Nociforo, C., Ong, H. J., Otsuka, T., Pietri, S., Prochazka, A., Scheidenberger, C., Sitar, B., Strmen, P., Takechi, M., Tanaka, J., Tanihata, I., Terashima, S., Vargas, J., Weick, H., and Winfield, J. S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The root mean square radii of the proton density distribution in $^{16-24}$O derived from measurements of charge changing cross sections with a carbon target at $\sim$900$A$ MeV together with the matter radii portray thick neutron skin for $^{22 - 24}$O despite $^{22,24}$O being doubly magic. Imprints of the shell closures at $N$ = 14 and 16 are reflected in local minima of their proton radii that provide evidence for the tensor interaction causing them. The radii agree with it ab initio calculations employing the chiral NNLO$_{\mathrm{sat}}$ interaction, though skin thickness predictions are challenged. Shell model predictions agree well with the data., Comment: 6 pages, 3 figures, accepted for publication in Physical Review Letters

Published
2022
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11. Systematic study of {\Delta}(1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn

Author

Rodriguez-Sanchez, J. L., Benlliure, J., Vidana, I., Lenske, H., Vargas, J., Scheidenberger, C., Alvarez-Pol, H., Atkinson, J., Aumann, T., Ayyad, Y., Beceiro-Novo, S., Boretzky, K., Caamano, M., Casarejos, E., Cortina-Gil, D., Fernandez, P. Diaz, Estrade, A., Geissel, H., Haettner, E., Kelic-Heil, A., Litvinov, Yu. A., Paradela, C., Perez-Loureiro, D., Pietri, S., Prochazka, A., Takechi, M., Tanaka, Y. K., Weick, H., and Winfield, J. S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The fragment separator FRS has been for the first time used to measure the (n,p) and (p,n)-type isobaric charge-exchange cross sections of stable 112,124Sn isotopes accelerated at 1A GeV with an uncertainty of 3% and to separate quasi-elastic and inelastic components in the missing-energy spectra of the ejectiles. The inelastic contribution can be associated to the excitation of isobar {\Delta}(1232) resonances and to the pion emission in s-wave, both in the target and projectile nuclei, while the quasi-elastic contribution is associated to the nuclear spin-isospin response of nucleon-hole excitations. The data lead to interesting results where we observe a clear quenching of the quasi-elastic component and their comparisons to theoretical calculations demonstrate that the baryonic resonances can be excited in the target and projectile nuclei. To go further in this investigation, we propose to study the excitation of baryonic resonances taking advantage of the combination of high-resolving power magnetic spectrometers with the WASA calorimeter. These new measurements will allow us to determine the momenta of the ejectiles and pions emitted in coincidence after the single isobaric charge-exchange collisions, providing us unique opportunities to study the evolution of the baryonic resonance dynamics with the neutron-proton asymmetry through the use of exotic radioactive ion beams., Comment: 14 pages, 9 figures. arXiv admin note: text overlap with arXiv:2004.06404

Published
2021
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12. Experimental investigation of ground-state properties of $^7$H with transfer reactions

Author

Caamaño, M., Roger, T., Moro, A. M., Grinyer, G. F., Pancin, J., Bagchi, S., Sambi, S., Gibelin, J., Fernandez-Dominguez, B., Itagaki, N., Benlliure, J., Cortina-Gil, D., Farget, F., Jacquot, B., Perez-Loureiro, D., Pietras, B., Raabe, R., Ramos, D., Tajes, C. Rodriguez, Savajols, H., and Vandebrouck, M.

Subjects
Nuclear Experiment
Abstract

The properties of nuclei with extreme neutron-to-proton ratios, far from those naturally occurring on Earth, are key to understand nuclear forces and how nucleons hold together to form nuclei. $^7$H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron-to-proton ratio known so far. However, its sheer existence and properties are still a challenge for experimental efforts and theoretical models. Here we report experimental evidences on the formation of $^7$H as a resonance, detected with independent observables, and the first measurement of the structure of its ground state. The resonance is found at $\sim$0.7 MeV above the $^3$H+4n mass, with a narrow width of $\sim$0.2 MeV and a $1/2^+$ spin and parity. These data are consistent with a $^7$H as a $^3$H core surrounded by an extended four-neutron halo, with a unique four-neutron decay and a relatively long half-life thanks to neutron pairing; a prime example of new phenomena occurring in what would be the most pure-neutron nuclear matter we can access in the laboratory.

Published
2021
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14. 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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15. 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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16. Observation of a correlated free four-neutron system

Author

Duer, M., Aumann, T., Gernhäuser, R., Panin, V., Paschalis, S., Rossi, D. M., Achouri, N. L., Ahn, D., Baba, H., Bertulani, C. A., Böhmer, M., Boretzky, K., Caesar, C., Chiga, N., Corsi, A., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernández-Domínguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halász, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Körper, D., Koseoglou, P., Kubota, Y., Kuti, I., Li, P. J., Lehr, C., Lindberg, S., Liu, Y., Marqués, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Monteagudo, B., Nakamura, T., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Park, S. Y., Parlog, M., Potlog, P. M., Reichert, S., Revel, A., Saito, A. T., Sasano, M., Scheit, H., Schindler, F., Shimoura, S., Simon, H., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J., and Zhukov, M. V.

Published
2022
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17. Lifetime measurement of the ²⁶O g.s. at SAMURAI

Author

Storck, S., Caesar, C., Kahlbow, J., Panin, V., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky’, K., Chae, H., Chiga, N., Choi, S., Cortés, M. L., Cortina-Gil, D., Deshayes, Q., Doornenbal, P., Elekes, Z., Fukuda, N., Gašparić, I., Hahn, K. I., Halász, Z., Hirayama, A., Hwang, J., Inabe, N., Isobe, T., Kim, S., Kobayashi, T., Körper, D., Marques, M., Matsumoto, M., Murakami, T., Murray, I., Nakamura, T., Nilsson, T., Otsu, H., Paschalis, S., Parlog, M., Petri, M., Rossi, D., Saito, A., Sasano, M., Scheit, H., Schrock, P., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Suzuki, H., Syndikus, I., Takeda, H., Törnqvist, H., Togano, Y., Tomai, T., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., Yoneda, K. I., Storck, S., Caesar, C., Kahlbow, J., Panin, V., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky’, K., Chae, H., Chiga, N., Choi, S., Cortés, M. L., Cortina-Gil, D., Deshayes, Q., Doornenbal, P., Elekes, Z., Fukuda, N., Gašparić, I., Hahn, K. I., Halász, Z., Hirayama, A., Hwang, J., Inabe, N., Isobe, T., Kim, S., Kobayashi, T., Körper, D., Marques, M., Matsumoto, M., Murakami, T., Murray, I., Nakamura, T., Nilsson, T., Otsu, H., Paschalis, S., Parlog, M., Petri, M., Rossi, D., Saito, A., Sasano, M., Scheit, H., Schrock, P., Shimizu, Y., Simon, H., Sohler, D., Sorlin, O., Stuhl, L., Suzuki, H., Syndikus, I., Takeda, H., Törnqvist, H., Togano, Y., Tomai, T., Uesaka, T., Yamada, H., Yang, Z., Yasuda, M., and Yoneda, K. I.

Abstract

The ground state of the neutron unbound nucleus ²⁶O is speculated to have a lifetime in the pico-second regime. In order to determine the decay lifetime of the ²⁶O ground state with high sensitivity and precision, a new method has been applied. The experiment was performed in December 2016 at the Superconducting Analyzer for MUlti-particle from Radio Isotope Beams (SAMURAI) at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. A ²⁷F beam was produced in the fragment separator BigRIPS and impinged on a W/Pt target ²⁶O ²⁶O outside the target. Thus, the velocity difference between the decay neutrons and the fragment 1 O delivers a characteristic spectrum from which the lifetime can be extracted.

Published
2024

19. 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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20. Study of scintillation properties and performance of CsI(Tl) detectors over time

Author

García-Jiménez, G., primary, Cabanelas, P., additional, González-Caamaño, D., additional, Alvarez-Pol, H., additional, Vicente-Pardal, M.A., additional, Benlliure, J., additional, Cederkäll, J., additional, Cortina-Gil, D., additional, Feijoo-Fontán, M., additional, Graña-González, A., additional, and Rodríguez-Sánchez, J.L., additional

Published
2023
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21. Fragmentation-induced fission reactions of 236U in inverse kinematics to investigate the pre-fragment angular momentum parameterizations.

Author

Rodríguez-Sánchez, J.L., Feijoo, M., Benlliure, J., Chatillon, A., Taïeb, J., Audouin, L., Alvarez-Pol, H., Ayyad, Y., Bélier, G., Boutoux, G., Caamaño, M., Casarejos, E., Cortina-Gil, D., Farget, F., Fernández-Domínguez, B., Gorbinet, T., Grente, L., Heinz, A., Johansson, H.T., and Jurado, B.

Subjects
FISSION neutrons, ANGULAR momentum (Mechanics), NUCLEAR energy, COLLISIONS (Nuclear physics), HEAVY nuclei
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. The collected data were used to constrain dynamic and nuclear structure parameters of different de-excitation models, such as ABLA and GEF, but the data can also be used to constrain the parameterizations describing the pre-fragment properties after the nuclear collision, such as the angular momentum gained by the pre-fragment. In this work, the fissioning system yields are compared to calculations assuming different parameterizations for modeling the angular momentum gained by the compound nuclei. Our findings indicate that the parameterizations utilized by abrasion models clearly underestimate the angular momentum, resulting in the underestimation of the production of lighter fissioning systems. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Fission studies in inverse kinematics with the R3B setup.

Author

Graña-González, J.A., Rodríguez-Sánchez, J.L., Benlliure, J., García-Jiménez, G., Alvarez-Pol, H., Cortina-Gil, D., Atar, L., Audouin, L., Authelet, G., Besteiro, A., Blanchon, G., Boretzky, K., Borge, M.J.G., Cabanelas, P., Casarejos, E., Cederkall, J., Chatillon, A., Corsi, A., Feijoo, M., and De Filippo, E.

Subjects
NUCLEAR fission, KINEMATICS, EXCITATION (Physiology), ASTROPHYSICS, ASTRONOMY
Abstract

Nuclear fission is a complex dynamical process, whose description involves the coupling between intrinsic and collective degrees of freedom, as well as different quantum-mechanical phenomena. For this reason, to this day it still lacks a satisfactory and complete microscopic description. In addition to the importance of describing fission itself, studies of the r-process in astrophysics depend on fission observables to constrain the theoretical models that explain the isotopic abundances in the Universe. To improve on the existing data, fission reactions of heavy nuclei in inverse kinematics are produced in quasi-free (p,2p) scattering reactions, which induce fission through particle-hole excitations that can range from few to tens of MeV. In order to study the evolution of the fission yields with temperature, the excitation energy of the fissioning system must be reconstructed, which is possible by measuring the four-momenta of the two outgoing protons. Performing this kind of experiment requires a complex experimental setup, providing full isotopic identification of both fission fragments and an accurate measurement of the momenta of the two outgoing protons. This was realized recently at the GSI/FAIR facility and some of the results obtained for the charge distributions are presented in this work. [ABSTRACT FROM AUTHOR]

Published
2023
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23. 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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24. Experimental investigation of ground-state properties of H with transfer reactions

Author

Caamaño, M., Roger, T., Moro, A.M., Grinyer, G.F., Pancin, J., Bagchi, S., Sambi, S., Gibelin, J., Fernández–Domínguez, B., Itagaki, N., Benlliure, J., Cortina–Gil, D., Farget, F., Jacquot, B., Pérez–Loureiro, D., Pietras, B., Raabe, R., Ramos, D., Rodríguez Tajes, C., Savajols, H., and Vandebrouck, M.

Abstract

The properties of nuclei with extreme neutron–to–proton ratios, far from those naturally occurring on Earth, are key to understand nuclear forces and how nucleons hold together to form nuclei. $^{7}$H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron–to–proton ratio known so far. However, its sheer existence and properties are still a challenge for experimental efforts and theoretical models. Here we report experimental evidences on the formation of $^{7}$H as a resonance, detected with independent observables, and the first measurement of the structure of its ground state. The resonance is found at ∼0.7 MeV above the $^{3}$H+4n mass, with a narrow width of ∼0.2 MeV and a 1/2+ spin and parity. These data are consistent with a $^{7}$H as a $^{3}$H core surrounded by an extended four-neutron halo, with a unique four-neutron decay and a relatively long half-life thanks to neutron pairing; a prime example of new phenomena occurring in what would be the most pure-neutron nuclear matter we can access in the laboratory.

Published
2023

25. 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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26. 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

27. Comprehensive investigation of fission yields by using spallation- and (p,2p)- induced fission reactions in inverse kinematics.

Author

Rodríguez-Sánchez, J. L., Graña-González, A., Benlliure, J., Chatillon, A., García-Jiménez, G., Taïeb, J., Alvarez-Pol, H., Atar, L., Audouin, L., Authelet, G., Besteiro, A., Blanchon, G., Boretzky, K., Cabanelas, P., Casarejos, E., Cederkall, J., Cortina-Gil, D., Corsi, A., De Filippo, E., and Feijoo, M.

Subjects
NUCLEAR fission, KINEMATICS, SPALLATION (Nuclear physics), NUCLEAR structure, NUCLEAR deformation
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. To go a step further, we propose now to induce fission by the use of quasi-free (p,2p) scattering reactions in inverse kinematics, which allows us to reconstruct the excitation energy of the compound fissioning system by using the four-momenta of the two outgoing protons. Therefore, this new approach might permit to correlate the excitation energy with the charge and mass distributions of the fission fragments and with the fission probabilities, given for the first time direct access to the simultaneous measurement of the fission yield dependence on temperature and fission barrier heights of exotic heavy nuclei, respectively. The first experiment based on this methodology was realized recently at the GSI/FAIR facility and a detailed description of the experimental setup is given here. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup.

Author

Chatillon, A., Boutoux, G., Gorbinet, T., Grente, L., Martin, J.-F., Pellereau, E., Taieb, J., Alvarez-Pol, H., Audouin, L., Ayyad, Y., Bélier, G., Benlliure, J., Caamaño, M., Casarejos, E., Cortina-Gil, D., Ebran, A., Farget, F., Fernández-Domínguez, B., Heinz, A., and Johansson, H. T.

Subjects
NUCLEAR fission, RADIOISOTOPES, RADIOACTIVE nuclear beams, NEUTRON emission, NUCLEAR structure
Abstract

Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Proton Distribution Radii of O16–24 : Signatures of New Shell Closures and Neutron Skin

Author

Kaur, S., primary, Kanungo, R., additional, Horiuchi, W., additional, Hagen, G., additional, Holt, J. D., additional, Hu, B. S., additional, Miyagi, T., additional, Suzuki, T., additional, Ameil, F., additional, Atkinson, J., additional, Ayyad, Y., additional, Bagchi, S., additional, Cortina-Gil, D., additional, Dillmann, I., additional, Estradé, A., additional, Evdokimov, A., additional, Farinon, F., additional, Geissel, H., additional, Guastalla, G., additional, Janik, R., additional, Knöbel, R., additional, Kurcewicz, J., additional, Litvinov, Yu. A., additional, Marta, M., additional, Mostazo, M., additional, Mukha, I., additional, Nociforo, C., additional, Ong, H. J., additional, Otsuka, T., additional, Pietri, S., additional, Prochazka, A., additional, Scheidenberger, C., additional, Sitar, B., additional, Strmen, P., additional, Takechi, M., additional, Tanaka, J., additional, Tanihata, I., additional, Terashima, S., additional, Vargas, J., additional, Weick, H., additional, and Winfield, J. S., additional

Published
2022
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30. Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes

Author

Chatillon, A., primary, Taïeb, J., additional, Heinz, A., additional, Alvarez-Pol, H., additional, Audouin, L., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Boutoux, G., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Gorbinet, T., additional, Grente, L., additional, Johansson, H. T., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Martin, J.-F., additional, Nociforo, C., additional, Paradela, C., additional, Pellereau, E., additional, Pietri, S., additional, Prochazka, A., additional, Rodríguez-Sánchez, J. L., additional, Rossi, D., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2022
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31. Systematic study of Δ (1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn

Author

Rodríguez-Sánchez, J. L., primary, Benlliure, J., additional, Vidaña, I., additional, Lenske, H., additional, Vargas, J., additional, Scheidenberger, C., additional, Alvarez-Pol, H., additional, Atkinson, J., additional, Aumann, T., additional, Ayyad, Y., additional, Beceiro-Novo, S., additional, Boretzky, K., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Díaz Fernández, P., additional, Estrade, A., additional, Geissel, H., additional, Haettner, E., additional, Kelić-Heil, A., additional, Litvinov, Yu. A., additional, Paradela, C., additional, Pérez-Loureiro, D., additional, Pietri, S., additional, Prochazka, A., additional, Takechi, M., additional, Tanaka, Y. K., additional, Weick, H., additional, and Winfield, J. S., additional

Published
2022
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33. 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

34. 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

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

Author

Lehr, C., Wamers, F., 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., Diaz Fernandez, 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, Mattias, Le Bleis, T., Lemmon, R., Litvinov, Yu A., Loeher, B., Mahata, K., Marganiec-Galazka, J., 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., Lehr, C., Wamers, F., 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., Diaz Fernandez, 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, Mattias, Le Bleis, T., Lemmon, R., Litvinov, Yu A., Loeher, B., Mahata, K., Marganiec-Galazka, J., 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

The proton drip-line nucleus Ne-17 is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the Ne-17(p, 2p)F-16* -> O-15+p quasi-free one-proton knockout reaction has been performed at GSI at around 500MeV/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 F-16 into O-15 (including gamma decays from excited states) and a proton, as well as the O-15+p relative-energy spectrum and the F-16 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 Ne-17. With a resulting relatively small l = 0 component of only around 35(3)%, it is concluded that Ne-17 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 O-15 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. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

Published
2022
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36. Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near 400A MeV

Author

Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., (0000-0003-0470-8367) Bemmerer, D., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N. P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz Redondo, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F. D. C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M. A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J. F., Volkov, V., (0000-0001-7575-3961) Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., (0000-0003-0470-8367) Bemmerer, D., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N. P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz Redondo, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F. D. C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M. A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J. F., Volkov, V., (0000-0001-7575-3961) Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.

Abstract

We measured 135 cross sections of residual nuclei produced in fragmentation reactions of 12C, 14N, and 13−16,20,22O projectiles impinging on a carbon target at kinetic energies of near 400A MeV, most of them for the first time, with the R 3B/LAND setup at the GSI facility in Darmstadt (Germany). The use of this state-of-the-art experimental setup in combination with the inverse kinematics technique gave the full identification in atomic and mass numbers of fragmentation residues with a high precision. The cross sections of these residues were determined with uncertainties below 20% for most of the cases. These data are compared to other previous measurements with stable isotopes and are also used to benchmark different model calculations.

Published
2022

37. Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near

Author

Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, Department of Energy (US), Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, Luis M., Freer, M., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.

Abstract

We measured 135 cross sections of residual nuclei produced in fragmentation reactions of C12, N14, and O13−16,20,22 projectiles impinging on a carbon target at kinetic energies of near 400A MeV, most of them for the first time, with the RB3/LAND setup at the GSI facility in Darmstadt (Germany). The use of this state-of-the-art experimental setup in combination with the inverse kinematics technique gave the full identification in atomic and mass numbers of fragmentation residues with a high precision. The cross sections of these residues were determined with uncertainties below 20% for most of the cases. These data are compared to other previous measurements with stable isotopes and are also used to benchmark different model calculations.

Published
2022

38. Unveiling the Two-Proton Halo Character of 17Ne: Exclusive Measurement of Quasi-free Proton-Knockout Reactions

Author

Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Technische Universität Darmstadt, Swedish Research Council, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Aumann, T. [0000-0003-1660-9294], Lehr, C., Wamers, F., 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., Diaz Fernandez, P., Emling, H., Ershova, O., Fraile, Luis 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., Bleis, T. Le, Lemmon, R., Litvinov, Yu. A., Loeher, B., Mahata, K., Marganiec-Galazka, J., Muentz, 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, R., Simon, H., Stroth, J., Suemmerer, K., Tengblad, Olof, Weick, H., Wimmer, C., Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Technische Universität Darmstadt, Swedish Research Council, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España), Department of Energy (US), National Science Foundation (US), Aumann, T. [0000-0003-1660-9294], Lehr, C., Wamers, F., 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., Diaz Fernandez, P., Emling, H., Ershova, O., Fraile, Luis 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., Bleis, T. Le, Lemmon, R., Litvinov, Yu. A., Loeher, B., Mahata, K., Marganiec-Galazka, J., Muentz, 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, R., Simon, H., Stroth, J., Suemmerer, K., Tengblad, Olof, 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->15O+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 gamma 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 ratio 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

39. Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near

Author

Boillos, J. M., Cortina-Gil, D., Benlliure, J., Rodríguez-Sánchez, J. L., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V. V., Beceiro-Novo, S., Bemmerer, D., Bertulani, C. A., Boretzky, K., García Borge, María José, Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cravo, E., Crespo, R. N.P., Dillmann, I., Díaz Fernández, P., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz Redondo, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H.T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kröll, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J. F.D.C., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, Ángel, Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, Guillermo, Rigollet, C., Rossi, D. M., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I. J., Taylor, J. T., Tengblad, Olof, Thies, R., Togano, Y., Vandebrouck, M., Velho, P. J.F., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G. L., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Federal Ministry of Education and Research (Germany), Swedish Research Council, and Department of Energy (US)

Abstract

13 pags., 8 figs., 1 tab., We measured 135 cross sections of residual nuclei produced in fragmentation reactions of C12, N14, and O13−16,20,22 projectiles impinging on a carbon target at kinetic energies of near 400A MeV, most of them for the first time, with the RB3/LAND setup at the GSI facility in Darmstadt (Germany). The use of this state-of-the-art experimental setup in combination with the inverse kinematics technique gave the full identification in atomic and mass numbers of fragmentation residues with a high precision. The cross sections of these residues were determined with uncertainties below 20% for most of the cases. These data are compared to other previous measurements with stable isotopes and are also used to benchmark different model calculations., This work has been partially supported by the Spanish Ministry for Science and Innovation under Grants No. PGC2018-099746-B-C21, No. PGC2018-099746-B-C22, and No. PID2019-104390GB-100; Xunta de Galicia under program “Grupos de referencia competitiva” (Project No. ED431C 2017/54); the German Bundesministerium für Bildung und Forschung (BMBF) (Grants No. 05P12RDFN8, No. 05P15RDFN1, and No. 05P19RDFN); the Swedish Research Council; and U.S. Department of Energy Grant No. DE-FG02-08ER41533. J.J.R.S. acknowledges the support of Xunta de Galicia under Grant No. ED481B-2017/002.

Published
2022

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