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1. Neutral pion number fluctuations at high multiplicity in pp-interactions at 50 GeV

Author

Popov V. V., Polkovnikov M. K., Pleskach A. V., Petukhov Y. P., Petrov V. S., Peshehonov V. D., Nikitin V. A., Myalkovskiy V. V., Mitrofanov G. A., Merkin M. M., Lysan V. N., Lyutov S. I., Lobanova E. V., Lobanov I. S., Leflat A. K., Lanschikov G. I., Kutov A. Ya., Kurchaninov L. L., Kubarovsky A. V., Konstantinov V. V., Kramarenko V. N., Kokoulina E. S., Kiryakov A. A., Kireev V. I., Kholodenko A. G., Kekelidze G. D., Karmanov D. E., Grishkevich Ya. V., Grishin N. I., Gorokhov S. A., Golovnya S. N., Golovkin V. F., Furmanets N. F., Ermolov P. F., Ermakov G. G., Chentsov Yu. A., Budilov V. A., Borzunov Yu. T., Bogdanova G. A., Berezhnev S. F., Batouritski M. A., Basiladze S. G., Balandin V. P., Avdeichikov V. V., Ardashev E. N., Aleev A. N., Afonin A. G., Ronzhin V. N., Rufanov I. A., Ryadovikov V. N., Senko V. A., Shalanda N. A., Soldatov M. M., Tikhonova L. A., Tsyupa Yu. P., Vishnevskaya A. M., Volkov V. Yu., Vorobiev A. P., Voronin A. G., Yakimchuk V. I., Yukaev A. I., Zapolskii V. N., Zhidkov N. K., Zotkin S. A., and Zverev E. G.

Subjects
Physics, QC1-999
Abstract

The results of E-190 experiment (project Thermalization) with 50 GeV proton beam irradiation of SVD-2 setup are presented. MC simulation has shown the linear dependence of number of photons detected in electromagnetic calorimeter and the average number of neutral pions. Multiplicity distribution of neutral pion, N0, for total number of particles in the event, Ntot = Nch + N0, are obtained with corrections on the setup acceptance, triggering and efficiency of the event reconstruction. The scaled variance of neutral pion fluctuations, ω = D/ < N0 >, versus total multiplicity is measured. The fluctuations increase at Ntot > 18. According to quantum statistics models this behavior can indicate a pion condensate formation in the high pion multiplicity system. This effect has been observed for the first time.

Published
2012
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2. Strong neutron pairing in core+4n nuclei

Author

Revel, A., Marques, F. M., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Vandebrouck, M., Wamers, F., Alvarez-Pol, H., Atar, L., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Casarejos, E., Catford, W. N., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz, D., Geissel, H., Gernhauser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kroll, T., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nacher, E., Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Roder, M., Rossi, D., Savran, D., Scheit, H., Simon, H., Syndikus, I., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment
Abstract

The emission of neutron pairs from the neutron-rich $N\!=\!12$ isotones $^{18}$C and $^{20}$O has been studied by high-energy nucleon knockout from $^{19}$N and $^{21}$O secondary beams, populating unbound states of the two isotones up to 15~MeV above their two-neutron emission thresholds. The analysis of triple fragment-$n$-$n$ correlations shows that the decay $^{19}$N$(-1p)^{18}$C$^*\!\rightarrow^{16}$C+$n$+$n$ is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a $^{14}$C core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay $^{21}$O$(-1n)^{20}$O$^*\!\rightarrow^{18}$O+$n$+$n$, attributed to its formation through the knockout of a deeply-bound neutron that breaks the $^{16}$O core and reduces the number of pairs., Comment: 6 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Published
2018
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3. Effective proton-neutron interaction near the drip line from unbound states in $^{25,26}$F

Author

Vandebrouck, M., Lepailleur, A., Sorlin, O., Aumann, T., Caesar, C., Holl, M., Panin, V., Wamers, F., Stroberg, S. R., Holt, J. D., Santos, F. De Oliveira, Alvarez-Pol, H., Atar, L., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Bogner, S. K., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz, D., Geissel, H., Gernhauser, R., Gibelin, J., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hergert, H., 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., Bleis, T. Le, Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Marques, F. M., Movsesyan, A., Nacher, E., Najafi, M., Nikolskii, E., Nilsson, T., Nociforo, C., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Röder, M., Rossi, D., Savran, D., Scheit, H., Schwenk, A., Simon, H., Syndikus, I., Taylor, J., Tengblad, O., Thies, R., Togano, Y., Velho, P., Volkov, V., Wagner, A., Weick, H., Wheldon, C., Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment
Abstract

Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The $^{26}$F nucleus, composed of a deeply bound $\pi0d\_{5/2}$ proton and an unbound $\nu0d\_{3/2}$ neutron on top of an $^{24}$O core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a $J^{\pi} = 1^{+}\_1 - 4^{+}\_1$ multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The $J^{\pi} = 1^{+}\_1, 2^{+}\_1,4^{+}\_1$ bound states have been determined, and only a clear identification of the $J^{\pi} =3^{+}\_1$ is missing.Purpose: We wish to complete the study of the $J^{\pi} = 1^{+}\_1 - 4^{+}\_1$ multiplet in $^{26}$F, by studying the energy and width of the $J^{\pi} =3^{+}\_1$ unbound state. The method was firstly validated by the study of unbound states in $^{25}$F, for which resonances were already observed in a previous experiment.Method: Radioactive beams of $^{26}$Ne and $^{27}$Ne, produced at about $440A$\,MeV by the FRagment Separator at the GSI facility, were used to populate unbound states in $^{25}$F and $^{26}$F via one-proton knockout reactions on a CH$\_2$ target, located at the object focal point of the R$^3$B/LAND setup. The detection of emitted $\gamma$-rays and neutrons, added to the reconstruction of the momentum vector of the $A-1$ nuclei, allowed the determination of the energy of three unbound states in $^{25}$F and two in $^{26}$F. Results: Based on its width and decay properties, the first unbound state in $^{25}$F is proposed to be a $J^{\pi} = 1/2^-$ arising from a $p\_{1/2}$ proton-hole state. In $^{26}$F, the first resonance at 323(33)~keV is proposed to be the $J^{\pi} =3^{+}\_1$ member of the $J^{\pi} = 1^{+}\_1 - 4^{+}\_1$ multiplet. Energies of observed states in $^{25,26}$F have been compared to calculations using the independent-particle shell model, a phenomenological shell-model, and the ab initio valence-space in-medium similarity renormalization group method.Conclusions: The deduced effective proton-neutron interaction is weakened by about 30-40\% in comparison to the models, pointing to the need of implementing the role of the continuum in theoretical descriptions, or to a wrong determination of the atomic mass of $^{26}$F., Comment: 14 pages, 7 figures, 3 tables, submitted to PRC

Published
2017
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4. Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Author

Heine, M., Typel, S., Wu, M. -R., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Martínez-Pinedo, G., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Neff, T., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., del Rio, J. Sanchez, Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract

With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2016
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5. Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Author

Thies, R., Heinz, A., Adachi, T., Aksyutina, Y., Alcantara-Núñes, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Datta, U., Fernández, P. Díaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., del Rio, J. Sanchez, Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment
Abstract

Background: Models describing nuclear fragmentation and fragmentation-fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool to reach the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes. Method: We have measured projectile fragments from 10,12-18C and 10-15B isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent dataset. We compare our data to model calculations. Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic 10,12-18C and 10-15B isotopes impinging on a carbon target. Comparing model calculations to the data, we find that EPAX is not able to describe the data satisfactorily. Using ABRABLA07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease ABRABLA07 describes the data surprisingly well. Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data have allowed for a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study.

Published
2016
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6. Soft photon registration at Nuclotron

Author

Kokoulina, Elena, Ardashev, E., Golovkin, V., Golovnya, S., Gorokhov, S., Kholodenko, A., Kiryakov, A., Lobanov, I., Polkovnikov, M., Ronzhin, V., Ryadovikov, V., Tsyupa, Yu., Vorobiev, A., Avdeichikov, V., Balandin, V., Dunin, V., Gavrishchuk, O., Isupov, A., Kuzmin, N., Nikitin, V., Petukhov, Yu., Reznikov, S., Rogov, V., Rufanov, I., Zhidkov, N., Zolin, L., Bogdanova, G., Popov, V., Volkov, V., Kutov, A., Kazakov, A., Pokatashkin, G., and Salyanko, R.

Subjects
Nuclear Experiment
Abstract

First results of a soft photon yield in nucleus-nuclear interactions at 3.5 GeV per nucleon are presented. These photons have been registered at Nuclotron (LHEP, JINR) by an electromagnetic calorimeter built in the SVD Collaboration. The obtained spectra confirm the excess yield in the energy region less than 50 MeV in comparison with theoretical predictions and agree with previous experiments at high-energy interactions., Comment: 5 pages, 3 figures, presented at the International Conference on New Photo-detectors July 6-9, 2015, Moscow, Troitsk, Russia

Published
2015

7. Nuclear astrophysics with radioactive ions at FAIR

Author

Reifarth, R., Altstadt, S., Göbel, K., Heftrich, T., Heil, M., Koloczek, A., Langer, C., Plag, R., Pohl, M., Sonnabend, K., Weigand, M., Adachi, T., Aksouh, F., Al-Khalili, J., AlGarawi, M., AlGhamdi, S., Alkhazov, G., Alkhomashi, N., Alvarez-Pol, H., Alvarez-Rodriguez, R., Andreev, V., Andrei, B., Atar, L., Aumann, T., Avdeichikov, V., Bacri, C., Bagchi, S., Barbieri, C., Beceiro, S., Beck, C., Beinrucker, C., Belier, G., Bemmerer, D., Bendel, M., Benlliure, J., Benzoni, G., Berjillos, R., Bertini, D., Bertulani, C., Bishop, S., Blasi, N., Bloch, T., Blumenfeld, Y., Bonaccorso, A., Boretzky, K., Botvina, A., Boudard, A., Boutachkov, P., Boztosun, I., Bracco, A., Brambilla, S., Monago, J. Briz, Caamano, M., Caesar, C., Camera, F., Casarejos, E., Catford, W., Cederkall, J., Cederwall, B., Chartier, M., Chatillon, A., Cherciu, M., Chulkov, L., Coleman-Smith, P., Cortina-Gil, D., Crespi, F., Crespo, R., Cresswell, J., Csatlós, M., Déchery, F., Davids, B., Davinson, T., Derya, V., Detistov, P., Fernandez, P. Diaz, DiJulio, D., Dmitry, S., Doré, D., Duenas, J., Dupont, E., Egelhof, P., Egorova, I., Elekes, Z., Enders, J., Endres, J., Ershov, S., Ershova, O., Fernandez-Dominguez, B., Fetisov, A., Fiori, E., Fomichev, A., Fonseca, M., Fraile, L., Freer, M., Friese, J., Borge, M. G., Redondo, D. Galaviz, Gannon, S., Garg, U., Gasparic, I., Gasques, L., Gastineau, B., Geissel, H., Gernhäuser, R., Ghosh, T., Gilbert, M., Glorius, J., Golubev, P., Gorshkov, A., Gourishetty, A., Grigorenko, L., Gulyas, J., Haiduc, M., Hammache, F., Harakeh, M., Hass, M., Heine, M., Hennig, A., Henriques, A., Herzberg, R., Holl, M., Ignatov, A., Ignatyuk, A., Ilieva, S., Ivanov, M., Iwasa, N., Jakobsson, B., Johansson, H., Jonson, B., Joshi, P., Junghans, A., Jurado, B., Körner, G., Kalantar, N., Kanungo, R., Kelic-Heil, A., Kezzar, K., Khan, E., Khanzadeev, A., Kiselev, O., Kogimtzis, M., Körper, D., Kräckmann, S., Kröll, T., Krücken, R., Krasznahorkay, A., Kratz, J., Kresan, D., Krings, T., Krumbholz, A., Krupko, S., Kulessa, R., Kumar, S., Kurz, N., Kuzmin, E., Labiche, M., Langanke, K., Lazarus, I., Bleis, T. Le, Lederer, C., Lemasson, A., Lemmon, R., Liberati, V., Litvinov, Y., Löher, B., Herraiz, J. Lopez, Münzenberg, G., Machado, J., Maev, E., Mahata, K., Mancusi, D., Marganiec, J., Perez, M. Martinez, Marusov, V., Mengoni, D., Million, B., Morcelle, V., Moreno, O., Movsesyan, A., Nacher, E., Najafi, M., Nakamura, T., Naqvi, F., Nikolski, E., Nilsson, T., Nociforo, C., Nolan, P., Novatsky, B., Nyman, G., Ornelas, A., Palit, R., Pandit, S., Panin, V., Paradela, C., Parkar, V., Paschalis, S., Pawłowski, P., Perea, A., Pereira, J., Petrache, C., Petri, M., Pickstone, S., Pietralla, N., Pietri, S., Pivovarov, Y., Potlog, P., Prokofiev, A., Rastrepina, G., Rauscher, T., Ribeiro, G., Ricciardi, M., Richter, A., Rigollet, C., Riisager, K., Rios, A., Ritter, C., Frutos, T. Rodríguez, Vignote, J. Rodriguez, Röder, M., Romig, C., Rossi, D., Roussel-Chomaz, P., Rout, P., Roy, S., Söderström, P., Sarkar, M. Saha, Sakuta, S., Salsac, M., Sampson, J., Saez, J. Sanchez del Rio, Rosado, J. Sanchez, Sanjari, S., Sarriguren, P., Sauerwein, A., Savran, D., Scheidenberger, C., Scheit, H., Schmidt, S., Schmitt, C., Schnorrenberger, L., Schrock, P., Schwengner, R., Seddon, D., Sherrill, B., Shrivastava, A., Sidorchuk, S., Silva, J., Simon, H., Simpson, E., Singh, P., Slobodan, D., Sohler, D., Spieker, M., Stach, D., Stan, E., Stanoiu, M., Stepantsov, S., Stevenson, P., Strieder, F., Stuhl, L., Suda, T., Sümmerer, K., Streicher, B., Taieb, J., Takechi, M., Tanihata, I., Taylor, J., Tengblad, O., Ter-Akopian, G., Terashima, S., Teubig, P., Thies, R., Thoennessen, M., Thomas, T., Thornhill, J., Thungstrom, G., Timar, J., Togano, Y., Tomohiro, U., Tornyi, T., Tostevin, J., Townsley, C., Trautmann, W., Trivedi, T., Typel, S., Uberseder, E., Udias, J., Uesaka, T., Uvarov, L., Vajta, Z., Velho, P., Vikhrov, V., Volknandt, M., Volkov, V., von Neumann-Cosel, P., von Schmid, M., Wagner, A., Wamers, F., Weick, H., Wells, D., Westerberg, L., Wieland, O., Wiescher, M., Wimmer, C., Wimmer, K., Winfield, J. S., Winkel, M., Woods, P., Wyss, R., Yakorev, D., Yavor, M., Cardona, J. Zamora, Zartova, I., Zerguerras, T., Zgura, I., Zhdanov, A., Zhukov, M., Zieblinski, M., Zilges, A., and Zuber, K.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Nuclear Experiment
Abstract

The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-process beta-decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes., Comment: Invited Talk given at the Conference Nuclear Physice in Astrophysics VI (NPA6), Lisbon, Portugal, May 19-24 2013. To appear in the NPA6 Proceedings in Journal of Physics: Conference Series (JPCS)

Published
2013
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8. Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O

Author

Caesar, C., Simonis, J., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J. D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D. M., del Rio, J. Sanchez, Savran, D., Scheit, H., Schwenk, A., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., Zoric, M., Zuber, K., and collaboration, R3B

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoret- ically. In this first R3B-LAND experiment, the unbound states are populated at GSI via proton- knockout reactions from 26F and 27F at relativistic energies around 450 MeV/nucleon. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground- state energy and lifetime are determined, and upper limits for the 26O ground state are extracted. In addition, the results provide evidence for an excited state in 26O at around 4 MeV. The ex- perimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

Published
2012
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9. Neutral pion number fluctuations at high multiplicity in pp-interactions at 50 GeV

Author

Collaboration, SVD-2, Afonin, A. G., Aleev, A. N., Ardashev, E. N., Avdeichikov, V. V., Balandin, V. P., Basiladze, S. G., Batouritski, M. A., Berezhnev, S. F., Bogdanova, G. A., Borzunov, Yu. T., Budilov, V. A., Chentsov, Yu. A., Golovkin, V. F., Golovnya, S. N., Gorokhov, S. A., Grishin, N. I., Grishkevich, Ya. V., Ermakov, G. G., Ermolov, P. F., Furmanets, N. F., Karmanov, D. E., Karpov, A. V., Kekelidze, G. D., Kireev, V. I., Kiryakov, A. A., Kholodenko, A. G., Kokoulina, E. S., Konstantinov, V. V., Kramarenko, V. N., Kubarovsky, A. V., Kulikov, A. K., Kuraev, E. A., Kurchaninov, L. L., Kutov, A. Ya., Kuzmin, N. A., Leflat, G. I. Lanschikov A. K., Lobanov, I. S., Lobanova, E. V., Lyutov, S. I., Lysan, V. N., Merkin, M. M., Mitrofanov, G. A., Myalkovskiy, V. V., Nikitin, V. A., Peshehonov, V. D., Petrov, V. S., Petukhov, Y. P., Pleskach, A. V., Polkovnikov, M. K., Popov, V. V., Riadovikov, V. N., Ronzhin, V. N., Rufanov, I. A., Senko, V. A., Shalanda, N. A., Soldatov, M. M., Spiryakin, V. I., Terletskiy, A. V., Tikhonova, L. A., Tsyupa, Yu. P., Vishnevskaya, A. M., Volkov, V. Yu., Vorobiev, A. P., Voronin, A. G., Yakimchuk, V. I., Yukaev, A. I., Zapolskii, V. N., Zhidkov, N. K., Zotkin, S. A., and Zverev, E. G.

Subjects
High Energy Physics - Experiment
Abstract

Neutral pion number N0 distributions for each total number of particles in event Ntot=Nch+N0 are obtained. The scaled variance of neutral pion fluctuations, omega=D/, is measured. The fluctuations increase at Ntot >22. According to quantum statistics models it may indicate for the approaching to pion condensate conditions for high pion multiplicity in the system., Comment: 8 pages, 9 figures, submitted to journal Physics of Atomic Nuclei

Published
2011

10. Proton interactions with high multiplicity

Author

Afonin, A. G., Aleev, A. N., Ardashev, E. N., Avdeichikov, V. V., Balandin, V. P., Basiladze, S. G., Batouritski, M. A., Berezhnev, S. F., Bogdanova, G. A., Borzunov, Yu. T., Budilov, V. A., Chentsov, Yu. A., Golovkin, V. F., Golovnya, S. N., Gorokhov, S. A., Grishin, N. I., Grishkevich, Ya. V., Ermakov, G. G., Ermolov, P. F., Furmanets, N. F., Karmanov, D. E., Karpov, A. V., Kekelidze, G. D., Kireev, V. I., Kiryakov, A. A., Kholodenko, A. G., Kokoulina, E. S., Konstantinov, V. V., Kramarenko, V. N., Kubarovsky, A. V., Kulikov, A. K., Kuraev, E. A., Kurchaninov, L. L., Kutov, A. Ya., Kuzmin, N. A., Leflat, G. I. Lanschikov A. K., Lobanov, I. S., Lobanova, E. V., Lutov, S. I., Lysan, V. N., Merkin, M. M., Mitrofanov, G. A., Myalkovskiy, V. V., Nikitin, V. A., Peshehonov, V. D., Petrov, V. S., Petukhov, Y. P., Pleskach, A. V., Polkovnikov, M. K., Popov, V. V., Riadovikov, V. N., Ronzhin, V. N., Rufanov, I. A., Senko, V. A., Shalanda, N. A., Soldatov, M. M., Spiryakin, V. I., Terletskiy, A. V., Tikhonova, L. A., Tsyupa, Yu. P., Vishnevskaya, A. M., Volkov, V. Yu., Vorobiev, A. P., Voronin, A. G., Yakimchuk, V. I., Yukaev, A. I., Zapolskii, V. N., Zhidkov, N. K., Zotkin, S. A., and Zverev, E. G.

Subjects
High Energy Physics - Experiment
Abstract

Project Thermalization (Experiment SERP-E-190 at IHEP) is aimed to study the proton - proton interactions at 50 GeV with large number of secondary particles. In this report the experimentally measured topological cross sections are presented taking into account the detector response and procession efficiency. These data are in good agreement with gluon dominance model. The comparison with other models is also made and shows no essential discrepancies., Comment: 7 pages, 7 figures, 2 tables. Preprint IHEP 2011-4

Published
2011

11. A measurement of the differential cross section for the two-body photodisintegration of 3He at theta_LAB = 90deg using tagged photons in the energy range 14 -- 31 MeV

Author

Karlsson, M., Adler, J. -O., Andersson, L. E. M., Avdeichikov, V., Berman, B. L., Boland, M. J., Briscoe, W. J., Brudvik, J., Calarco, J. R., Feldman, G., Fissum, K. G., Hansen, K., Hornidge, D. L., Isaksson, L., Kolb, N. R., Kotov, A. A., Lilja, P., Lundin, M., Nilsson, B., Nilsson, D., O'Rielly, G. V., Petrov, G. E., Schroder, B., Strakovsky, I. I., and Vaishnene, L. A.

Subjects
Nuclear Experiment
Abstract

The two-body photodisintegration of 3He has been investigated using tagged photons with energies from 14 -- 31 MeV at MAX-lab in Lund, Sweden. The two-body breakup channel was unambiguously identified by the (nonsimultaneous) detection of both protons and deuterons. This approach was made feasible by the over-determined kinematic situation afforded by the tagged-photon technique. Proton- and deuteron-energy spectra were measured using four silicon surface-barrier detector telescopes located at a laboratory angle of 90deg with respect to the incident photon-beam direction. Average statistical and systematic uncertainties of 5.7% and 6.6% in the differential cross section were obtained for 11 photon-energy bins with an average width of 1.2 MeV. The results are compared to previous experimental data measured at comparable photon energies as well as to the results of two recent Faddeev calculations which employ realistic potential models and take into account three-nucleon forces and final-state interactions. Both the accuracy and precision of the present data are improved over the previous measurements. The data are in good agreement with most of the previous results, and favor the inclusion of three-nucleon forces in the calculations., Comment: 12 pages, 13 figures; further Referee comments addressed

Published
2009
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12. Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold

Author

Golubev, P., Avdeichikov, V., Fissum, K. G., Jakobsson, B., Pshenichnov, I. A., Briscoe, W. J., O'Rielly, G. V., Annand, J., Hansen, K., Isaksson, L., Jaederstrom, H., Karlsson, M., Lundin, M., Schroeder, B., and Westerberg, L.

Subjects
Nuclear Experiment
Abstract

The first data from MAX-lab in Lund, Sweden on pion production in photonuclear reactions at threshold energies, is presented. The decrease of the total yield of pi+ in gamma + 12C, 27Al reactions below 200 MeV as well as differential, dsigma/dOmega, cross sections follow essentially predictions from an intranuclear cascade model with an attractive potential for pion-nucleus interaction in its simplest form. Double differential, d2sigma/dOmegadT, cross sections at 176 MeV show, however, deviations from the model, which call for refinements of nuclear and Coulomb potentials and possibly also for coherent pion production mechanisms., Comment: 19 pages, 7 figures

Published
2008
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13. Light cluster production in E/A = 61 MeV 36Ar + 112,124Sn reactions

Author

Ghetti, R., Helgesson, J., Avdeichikov, V., Jakobsson, B., Colonna, N., Tagliente, G., Wilschut, H. W., and Kravchuk, V. L.

Subjects
Nuclear Experiment
Abstract

Experimental kinetic energy distributions and small-angle two-particle correlation functions involving deuterons and tritons are compared for 36Ar+ 112,124Sn collisions at E/A = 61 MeV (i.e. for systems similar in size, but with different isospin content). A larger triton yield is observed from the more neutron-rich system, as predicted by IBUU simulations, while the emission times of the light clusters are found to be the same for the two Sn-target systems. For both systems, the time sequence tau_{d} < tau_{p} < tau_{t}, is deduced for charged particles emitted from the intermediate velocity source., Comment: 4 pages, 3 figures, submitted to Phys. Rev. C

Published
2005

14. Analysis of charged particle emission sources and coalescence in E/A = 61 MeV $^{36}$Ar + $^{27}$Al, $^{112}$Sn and $^{124}$Sn collisions

Author

Avdeichikov, V., Ghetti, R., Helgesson, J., Jakobsson, B., Golubev, P., Colonna, N., and Wilschut, H. W.

Subjects
Nuclear Experiment
Abstract

Single-particle kinetic energy spectra and two-particle small angle correlations of protons ($p$), deuterons ($d$) and tritons ($t$) have been measured simultaneously in 61A MeV $^{36}$Ar + $^{27}$Al, $^{112}$Sn and $^{124}$Sn collisions. Characteristics of the emission sources have been derived from a ``source identification plot'' ($\beta_{source}$--$E_{CM}$ plot), constructed from the single-particle invariant spectra, and compared to the complementary results from two-particle correlation functions. Furthermore, the source identification plot has been used to determine the conditions when the coalescence mechanism can be applied for composite particles. In our data, this is the case only for the Ar + Al reaction, where $p$, $d$ and $t$ are found to originate from a common source of emission (from the overlap region between target and projectile). In this case, the coalescence model parameter, $\tilde{p}_0$ -- the radius of the complex particle emission source in momentum space, has been analyzed., Comment: 20 pages, 5 figures, submitted to Nuclear Physics A

Published
2004
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15. Isospin effects on two-particle correlation functions in E/A = 61 MeV 36Ar + 112,124Sn reactions

Author

Ghetti, R., Avdeichikov, V., Jakobsson, B., Golubev, P., Helgesson, J., Colonna, N., Tagliente, G., Wilschut, H. W., Kopecky, S., Kravchuk, V. L., Anderson, E. W., Nadel-Turonski, P., Westerberg, L., Bellini, V., Sperduto, M. L., and Sutera, C.

Subjects
Nuclear Experiment
Abstract

Small-angle, two-particle correlation functions have been measured for 36Ar+ 112,124Sn collisions at E/A = 61 MeV. Total momentum gated neutron-proton (np) and proton-proton (pp) correlations are stronger for the 124Sn-target. Some of the correlation functions for particle pairs involving deuterons or tritons (nd, pt, and nt) also show a dependence on the isospin of the emitting source., Comment: 4 pages, 4 figures. Submitted to Physical Review Letters

Published
2003
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16. 13,14B(n, γ) via Coulomb Dissociation for Nucleosynthesis towards the r-Process

Author

Altstadt, S.G., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C.A., Boretzky, K., Borge, M.J.G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L.M., Freer, M., Freudenberger, M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J.D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M.V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez del Rio, J., Savran, D., Scheit, H., Schwenk, A., Simon, H., Simonis, J., Sonnabend, K., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J.S., Woods, P., Yakorev, D., Zhukov, M.V., Zilges, A., Zoric, M., and Zuber, K.

Published
2014
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17. CALIFA, a Dedicated Calorimeter for the R3B/FAIR

Author

Cortina-Gil, D., Alvarez-Pol, H., Aumann, T., Avdeichikov, V., Bendel, M., Benlliure, J., Bertini, D., Bezbakh, A., Bloch, T., Böhmer, M., Borge, M.J.G., Briz, J.A., Cabanelas, P., Casarejos, E., Carmona Gallardo, M., Cederkäll, J., Chulkov, L., Dierigl, M., Di Julio, D., Durán, I., Fiori, E., Fomichev, A., Galaviz, D., Gascón, M., Gernhäuser, R., Gerl, J., Golubev, P., Golovkov, M., González, D., Gorshkov, A., Heinz, A., Heil, M., Henning, W., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H.T., Kröll, Th., Krücken, R., Krupko, S., Kurz, N., Le Bleis, T., Löher, B., Nacher, E., Nilsson, T., Parrilla, C., Perea, A., Pietralla, N., Pietras, B., Reifarth, R., Sanchez del Rio, J., Savran, D., Sidorchuk, S., Simon, H., Schnorrenberger, L., Tengblad, O., Teubig, P., Thies, R., Vilán, J.A., von Schmid, M., Winkel, M., Winkler, S., Wamers, F., and Yañez, P.

Published
2014
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18. From soft photon study at Nuclotron and U-70 to NICA: Soft photons

Author

Ardashev, E., Avdeichikov, V., Balandin, V., Bogdanova, G., Dunin, V., Gavrishchuk, O., Golovkin, V., Golovnya, S., Gorokhov, S., Isupov, A., Kazakov, A., Kholodenko, A., Kiryakov, A., Kokoulina, E., Kutov, A., Kuzmin, N., Lobanov, I., Nikitin, V., Petukhov, Yu., Pokatashkin, G., Polkovnikov, M., Popov, V., Reznikov, S., Rogov, V., Ronzhin, V., Rufanov, I. A., Ryadovikov, V., Tsyupa, Yu., Volkov, V., Vorobiev, A., Zhidkov, N., and Zolin, L.

Published
2016
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19. The Lund–York–Cologne Calorimeter (LYCCA): Concept, design and prototype developments for a FAIR-NUSTAR detector system to discriminate relativistic heavy-ion reaction products

Author

Golubev, P., Wendt, A., Scruton, L., Taprogge, J., Rudolph, D., Reiter, P., Bentley, M.A., Avdeichikov, V., Boutachkov, P., Fox, S.P., Gerl, J., Görgen, Ch., Hoischen, R., Kurz, N., Nara Singh, B.S., Pascovici, G., Pietri, S., Schaffner, H., Taylor, M.J., Thiel, S., and Wollersheim, H.J.

Published
2013
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20. The upgraded photon tagging facility at the MAX IV Laboratory

Author

Adler, J.-O., Boland, M., Brudvik, J., Fissum, K., Hansen, K., Isaksson, L., Lilja, P., Lindgren, L.-J., Lundin, M., Nilsson, B., Pugachov, D., Sandell, A., Schroder, B., Avdeichikov, V., Golubev, P., Jakobsson, B., Annand, J.R.M., Livingston, K., Igarashi, R., Myers, L., Nathan, A., Briscoe, W.J., Feldman, G., Kovash, M., Branford, D., Föhl, K., Grabmayr, P., Takau, V., O'Rielly, G., Burdeynyi, D., Ganenko, V., Morochovskyi, V., and Vashchenko, G.

Published
2013
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21. 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

22. 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

23. The electron–ion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR)—A conceptual design study

Author

Antonov, A.N., Gaidarov, M.K., Ivanov, M.V., Kadrev, D.N., Aïche, M., Barreau, G., Czajkowski, S., Jurado, B., Belier, G., Chatillon, A., Granier, T., Taieb, J., Doré, D., Letourneau, A., Ridikas, D., Dupont, E., Berthoumieux, E., Panebianco, S., Farget, F., Schmitt, C., Audouin, L., Khan, E., Tassan-Got, L., Aumann, T., Beller, P., Boretzky, K., Dolinskii, A., Egelhof, P., Emling, H., Franzke, B., Geissel, H., Kelic-Heil, A., Kester, O., Kurz, N., Litvinov, Y., Münzenberg, G., Nolden, F., Schmidt, K.-H., Scheidenberger, Ch., Simon, H., Steck, M., Weick, H., Enders, J., Pietralla, N., Richter, A., Schrieder, G., Zilges, A., Distler, M.O., Merkel, H., Müller, U., Junghans, A.R., Lenske, H., Fujiwara, M., Suda, T., Kato, S., Adachi, T., Hamieh, S., Harakeh, M.N., Kalantar-Nayestanaki, N., Wörtche, H., Berg, G.P.A., Koop, I.A., Logatchov, P.V., Otboev, A.V., Parkhomchuk, V.V., Shatilov, D.N., Shatunov, P.Y., Shatunov, Y.M., Shiyankov, S.V., Shvartz, D.I., Skrinsky, A.N., Chulkov, L.V., Danilin, B.V., Korsheninnikov, A.A., Kuzmin, E.A., Ogloblin, A.A., Volkov, V.A., Grishkin, Y., Lisin, V.P., Mushkarenkov, A.N., Nedorezov, V., Polonski, A.L., Rudnev, N.V., Turinge, A.A., Artukh, A., Avdeichikov, V., Ershov, S.N., Fomichev, A., Golovkov, M., Gorshkov, A.V., Grigorenko, L., Klygin, S., Krupko, S., Meshkov, I.N., Rodin, A., Sereda, Y., Seleznev, I., Sidorchuk, S., Syresin, E., Stepantsov, S., Ter-Akopian, G., Teterev, Y., Vorontsov, A.N., Kamerdzhiev, S.P., Litvinova, E.V., Karataglidis, S., Alvarez Rodriguez, R., Borge, M.J.G., Fernandez Ramirez, C., Garrido, E., Sarriguren, P., Vignote, J.R., Fraile Prieto, L.M., Lopez Herraiz, J., Moya de Guerra, E., Udias-Moinelo, J., Amaro Soriano, J.E., Lallena Rojo, A.M., Caballero, J.A., Johansson, H.T., Jonson, B., Nilsson, T., Nyman, G., Zhukov, M., Golubev, P., Rudolph, D., Hencken, K., Jourdan, J., Krusche, B., Rauscher, T., Kiselev, D., Trautmann, D., Al-Khalili, J., Catford, W., Johnson, R., Stevenson, P.D., Barton, C., Jenkins, D., Lemmon, R., Chartier, M., Cullen, D., Bertulani, C.A., and Heinz, A.

Published
2011
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24. 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

26. Spectrometer with a vertex detector for experiments at the IHEP accelerator

Author

Avdeichikov, V. V., Aleev, A. N., Ardashev, E. N., Basiladze, S. G., Bogdanova, G. A., Vishnevskaya, A. M., Volkov, V. Yu., Vorob’ev, A. P., Voronin, A. G., Golovnya, S. N., Golovkin, V. F., Gorokhov, S. A., Grishkevich, Ya. V., Ermolov, P. F., Zverev, E. G., Zotkin, S. A., Karmanov, D. E., Kireev, V. I., Kokoulina, E. S., Kramarenko, V. A., Kutov, A. Ya., Lanshchikov, G. I., Leflat, A. K., Lyutov, S. I., Malyaev, V. Kh., Merkin, M. M., Mitrofanov, G. Ya., Myalkovskii, V. V., Nikitin, V. A., Petrov, V. S., Peshekhonov, V. D., Pleskach, A. V., Polkovnikov, M. K., Popov, V. V., Rufanov, I. A., Ryadovikov, V. N., Sen’ko, V. A., Soldatov, M. M., Tikhonova, L. A., Furmanets, N. F., Kholodenko, A. G., Tsyupa, Yu. P., Shalanda, N. A., Yukaev, A. I., and Yakimchuk, V. I.

Published
2013
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28. Thin detectors for the CHICSi deltaE-E telescope

Author

Evensen, L., Westgaard, T., Avdeichikov, V., Carlen, L., Jakobsson, B., Murin, Y., Martensson, J., Oskarsson, A., Siwek, A., Whitlow, H.J., Veldhuizen, E.J. van, Westerberg, L., and Guttormsen, M.

Subjects
Semiconductor nuclear counters -- Design and construction, Nuclear track detectors -- Design and construction, Ion accelerators -- Equipment and supplies, Heavy ion collisions -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A pilot series of 10 [[micro]meter] to 15 [[micro]meter] thin silicon detectors has been made for the [Delta]E-E telescopes in the CHICSi detector system. This system will operate at the CELSIUS heavy ion storage ring in Uppsala, Sweden. [Delta]E-E telescopes provide isotope identification and energy determination of fragments from nuclear collisions. The thin detectors are made as p-i-n diodes in thin etched membranes in 280 [[micro]meter] thick silicon wafers. The membranes are made with anisotropic etching using 25 w% tetramethylammonium hydroxide (TMAH) solution. The etch speed of this solution is very uniform across a wafer. As a result detectors with uniform thickness can be produced. The etch depth varies with less than [+ or -] 0.3 [[micro]meter] over a wafer and the surface microroughness is in the range from 2 to 4 nm. Each detector has a 10.0 mm x 10.0 mm active area on a 10.2 mm x 10.2 mm membrane surrounded by a 1.1 mm wide supporting frame. The detectors have leakage currents in the active area of approximately 0.5 nA at 20 V. The breakdown voltage of the detectors is above 100 V. Evaluation experiments with telescopes consisting of a thin detector in combination with a thick detector have shown excellent isotope separation capabilities. Mass separation of 6Li and 7Li is clearly observable.

Published
1997

33. Quasifree (p, pN) scattering of light neutron-rich nuclei near N=14

Author

Diaz Fernandez, P, Alvarez-Pol, H, Crespo, R, Cravo, E, Atar, L, Deltuva, A, Aumann, T, Avdeichikov, V, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boillos, JM, Boretzky, K, Borge, MJG, Caamano, M, Cabanelas, P, Caesar, C, Casarejos, E, Catford, W, Cederkall, J, Chartier, M, Chulkov, LV, Cortina-Gil, D, Pramanik, U Datta, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fernandez-Dominguez, B, Fraile, LM, Freer, M, Galaviz, D, Geissel, H, Gernhaeuser, R, Golubev, P, Goebel, K, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Holl, M, Hufnagel, A, Ignatov, A, Johansson, HT, Jonson, B, Jurciukonis, D, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knyazev, A, Kroell, T, Kurz, N, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lindberg, S, Machado, J, Marganiec, J, Moro, AM, Movsesyan, A, Nacher, E, Najafi, A, Nikolskii, E, Nilsson, T, Nociforo, C, Panin, V, Paschalis, S, Perea, A, Petri, M, Pietras, B, Pietri, S, Plag, R, Reifarth, R, Ribeiro, G, Rigollet, C, Rossi, D, Roeder, M, Savran, D, Scheit, H, Simon, H, Sorlin, O, Syndikus, I, Taylor, JT, Tengblad, O, Thies, R, Togano, Y, Vandebrouck, M, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Wheldon, C, Wilson, G, Winfield, JS, Woods, P, Yakorev, D, Zhukov, M, Zilges, A, Zuber, K, and Collaboration, R3B

Published
2018

34. Quasifree (p, pN) scattering of light neutron-rich nuclei near N=14

Author

Diaz Fernandez, P., Alvarez-Pol, H., Crespo, R., Cravo, E., Atar, L., Deltuva, A., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Cabanelas, P., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Pramanik, U. Datta, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fernandez-Dominguez, B., Fraile, L. M., Freer, M., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Kalantar-Nayestanaki, N., Najafi, A., Rigollet, C., Taylor, J. T., Wagner, A., and Research unit Nuclear & Hadron Physics

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The (RB)-B-3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C-12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p, pn) and (p, 2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N = 14 to N = 15. Method: The structure of the projectiles O-23, O-22, and N-21 has been studied simultaneously via (p, pn) and (p, 2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the (RB)-B-3-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p, pn) and (p, 2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p, pn) channels, indications of a change in the structure of these nuclei moving from N = 14 to N = 15 have been observed, i.e., from the 0d(5/2) shell to the 1s(1/2). This supports previous observations of a subshell closure at N = 14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.

Published
2018

35. Quasi-free (p,pN) scattering of light neutron-rich nuclei around N = 14

Author

Díaz Fernández, P., Alvarez-Pol, H., Crespo, R., Cravo, E., Atar, L., Deltuva, A., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamaño, M., Cabanelas, P., Caesar, C., Casarejos, E, Catford, W, Cederkäll, J., Chartier, M., Chulkov, L. V., Cortina-Gil, D, Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F., Fernández-Domínguez, B., Fraile, L 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., Paschalis, S., Petri, M., and Wilson, G.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The RB3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p,pn) and (p,2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N=14 to N=15. Method: The structure of the projectiles O23, O22, and N21 has been studied simultaneously via (p,pn) and (p,2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the R3B-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p,pn) and (p,2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p,pn) channels, indications of a change in the structure of these nuclei moving from N=14 to N=15 have been observed, i.e., from the 0d5/2 shell to the 1s1/2. This supports previous observations of a subshell closure at N=14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.

Published
2018

37. Design and commissioning of the GSI pion beam

Author

Dı́az, J, Yahlali, N, Ardid, M, Álvarez, M, Avdeichikov, V, Bokemeyer, H, Carlén, L, Franczak, B, Hartmann, O, Jakobsson, B, Koenig, W, Leinberger, U, Lommel, B, Metag, V, Murin, Yu.A, Mittig, W, Niebur, W, Novotny, R, Schicker, R, Simon, R.S, Schröter, A, and Schön, W

Published
2002
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39. Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Author

Atar, L, Paschalis, S, Barbieri, C, Bertulani, CA, Diaz Fernandez, P, Holl, M, Najafi, MA, Panin, V, Alvarez-Pol, H, Aumann, T, Avdeichikov, V, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Boillos, JM, Boretzky, K, Borge, MJG, Caamano, M, Caesar, C, Casarejos, E, Catford, W, Cederkall, J, Chartier, M, Chulkov, L, Cortina-Gil, D, Cravo, E, Crespo, R, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Galaviz Redondo, D, Geissel, H, Gernhaeuser, R, Golubev, P, Goebel, K, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Hufnagel, A, Ignatov, A, Johansson, HT, Jonson, B, Kahlbow, J, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knyazev, A, Kroell, T, Kurz, N, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lindberg, S, Machado, J, Marganiec-Galazka, J, Movsesyan, A, Nacher, E, Nikolskii, EY, Nilsson, T, Nociforo, C, Perea, A, Petri, M, Pietri, S, Plag, R, Reifarth, R, Ribeiro, G, Rigollet, C, Rossi, DM, Roeder, M, Savran, D, Scheit, H, Simon, H, Sorlin, O, Syndikus, I, Taylor, JT, Tengblad, O, Thies, R, Togano, Y, Vandebrouck, M, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Wheldon, C, Wilson, GL, Winfield, JS, Woods, P, Yakorev, D, Zhukov, M, Zilges, A, Zuber, K, and Collaboration, R3B

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300–450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type AO(p,2p)A−1N have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

Published
2018

40. Quasifree ($p,pN$) scattering of light neutron-rich nuclei near $N=14$

Author

Díaz Fernández, P., Alvarez-Pol, H., Crespo, R., Cravo, E., Atar, L., Deltuva, A., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C.A., Boillos, J.M., Boretzky, K., Borge, M.J.G., Caamaño, M., Cabanelas, P., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L.V., Cortina-Gil, D., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F., Fernández-Domínguez, B., Fraile, L.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., Jurčiukonis, D., 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., Marganiec, J., Moro, A.M., Movsesyan, A., Nacher, E., Najafi, A., Nikolskii, E., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietras, B., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J.T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, C., Wilson, G., Winfield, J.S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

International audience; Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The RB3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p,pn) and (p,2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N=14 to N=15. Method: The structure of the projectiles O23, O22, and N21 has been studied simultaneously via (p,pn) and (p,2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the R3B-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p,pn) and (p,2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p,pn) channels, indications of a change in the structure of these nuclei moving from N=14 to N=15 have been observed, i.e., from the 0d5/2 shell to the 1s1/2. This supports previous observations of a subshell closure at N=14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.

Published
2018
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41. Structure of $^{13}$Be studied in proton knockout from $^{14}$B

Author

Ribeiro, G., Nácher, E., Tengblad, O., Díaz Fernández, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., 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., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., Zuber, K., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), R$^3$B, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
radioactive beams, nuclear structure, Nuclear Theory, Aucun, 13Be, Nuclear Reactions, unbound nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Physical review / C 98(2), 024603 (2018). doi:10.1103/PhysRevC.98.024603, Published by Inst., Woodbury, NY

Published
2018
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42. Structure of Be13 studied in proton knockout from B14

Author

Ribeiro, G., Nácher, E., Tengblad, O., Díaz Fernández, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., 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., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
ddc
Published
2018

43. Quasifree ($p$, $2p$) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Author

Atar, Leyla, Paschalis, Stefanos, Barbieri, C., Bertulani, C. A., Fernández, P. Díaz, Holl, M., Najafi, M.A, Panin, V., Alvarez-Pol, H., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J.M., Boretzky, K., Borge, M. J. G., Caamaño, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L.M, Freer, M., Redondo, D. Galaviz, Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., 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., Marganiec-Gałązka, J., Movsesyan, A., Nacher, E., Nikolskii, E.Y., Nilsson, T., Nociforo, C., Perea, A., Petri, Marina, 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., Taylor, J. T., Tengblad, O, Thies, R., Togano, Y., Vandebrouck, M., Velho, P., 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, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Helmholtz Centre for Heavy Ion Research, Department of Energy (US), National Science Foundation (US), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), University of Leicester, and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, ddc:550, Aucun, Nuclear Experiment
Abstract

7 pags., 4 figs., tab., Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the (RB)-B-3/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type O-A(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry., This work was supported by the German Federal Ministry for Education and Research (BMBF project 05P15RDFN1), and through the GSI-TU Darmstadt cooperation agreement. The work of C. B., W. C., and G.W. was supported by the United Kingdom Science and Technology Facilities Council (STFC) under Grants No. ST/L005743/1 and No. ST/P005314/1. SCGF calculations were performed at the DiRAC Complexity system of the University of Leicester (BIS National E-1023 infrastructure capital Grant No. ST/K000373/1 and STFC 1024 Grant No. ST/K0003259/1). C. A. B. acknowledges support by the U.S. DOE Grant No. DE-FG02- 08ER41533 and the U.S. NSF Grant No. 1415656. L. M. F. acknowledges funding from MINECO FPA2015-65035-P project.

Published
2018
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44. Effective proton-neutron interaction near the drip line from unbound states in 25,26 F

Author

Vandebrouck, M., Lepailleur, A., Sorlin, O, Aumann, T., Caesar, C., Holl, M., Panin, V., Wamers, F., Stroberg, S. R., Holt, J. D., De Oliveira Santos, F., Alvarez-Pol, H., Atar, L., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Bogner, S. K., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamaño, M., Casarejos, E., Catford, W, Cederkäll, J., Chartier, M., Chulkov, L. V., Cortina-Gil, D, Cravo, E., Crespo, R., Datta Pramanik, U., Díaz Fernández, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz, D., Geissel, H, Gernhäuser, R., Gibelin, J., Golubev, P., Göbel, K., Hagdahl, J., Paschalis, S., and Petri, M.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F26 nucleus, composed of a deeply bound π0d5/2 proton and an unbound ν0d3/2 neutron on top of an O24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a Jπ=11+-41+ multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The Jπ=11+,21+,41+ bound states have been determined, and only a clear identification of the Jπ=31+ is missing. Purpose: We wish to complete the study of the Jπ=11+-41+ multiplet in F26, by studying the energy and width of the Jπ=31+ unbound state. The method was first validated by the study of unbound states in F25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne26 and Ne27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F25 and F26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the R3B/LAND setup. The detection of emitted γ rays and neutrons, added to the reconstruction of the momentum vector of the A-1 nuclei, allowed the determination of the energy of three unbound states in F25 and two in F26. Results: Based on its width and decay properties, the first unbound state in F25, at the relative energy of 49(9) keV, is proposed to be a Jπ=1/2- arising from a p1/2 proton-hole state. In F26, the first resonance at 323(33) keV is proposed to be the Jπ=31+ member of the Jπ=11+-41+ multiplet. Energies of observed states in F25,26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton-neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F26.

Published
2017

45. Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26

Author

Vandebrouck, M, Lepailleur, A, Sorlin, O, Aumann, T, Caesar, C, Holl, M, Panin, V, Wamers, F, Stroberg, SR, Holt, JD, Santos, FDO, Alvarez-Pol, H, Atar, L, Avdeichikov, V, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Bogner, SK, Boillos, JM, Boretzky, K, Borge, MJG, Caamano, M, Casarejos, E, Catford, W, Cederkall, J, Chartier, M, Chulkov, L, Cortina-Gil, D, Cravo, E, Crespo, R, Pramanik, UD, Diaz Fernandez, P, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Galaviz, D, Geissel, H, Gernhaeuser, R, Gibelin, J, Golubev, P, Goebel, K, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Hergert, H, Hufnagel, A, Ignatov, A, Johansson, HT, Jonson, B, Kahlbow, J, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knyazev, A, Kroll, T, Kurz, N, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lindberg, S, Machado, J, Marganiec, J, Marques, FM, Movsesyan, A, Nacher, E, Najafi, M, Nikolskii, E, Nilsson, T, Nociforo, C, Paschalis, S, Perea, A, Petri, M, Pietri, S, Plag, R, Reifarth, R, Ribeiro, G, Rigollet, C, Roeder, M, Rossi, D, Savran, D, Scheit, H, Schwenk, A, Simon, H, Syndikus, I, Taylor, JT, Tengblad, O, Thies, R, Togano, Y, Velho, P, Volkov, V, Wagner, A, Weick, H, Wheldon, C, Wilson, G, Winfield, JS, Woods, P, Yakorev, D, Zhukov, M, Zilges, A, Zuber, K, and Collaboration, R

Published
2017

47. Search for Collective Phenomena in High Multiplicity Events at Nuclotron and U-70

Author

Avdeichikov, V, primary, Bogdanova, G, additional, Borzunov, Y, additional, Gavrischuk, O, additional, Golovnya, S, additional, Dunin, V, additional, Kireev, V, additional, Kokoulina, E, additional, Kutov, A, additional, Mironov, I, additional, Nikitin, V, additional, Pokatashkin, G, additional, Putyrsky, M, additional, Riadovikov, V, additional, Roufanov, I, additional, Shulyakovsky, R, additional, Timoshin, S, additional, Volkov, V, additional, and Vorobiev, A, additional

Published
2018
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48. Quasi-free (p,pN) scattering of light neutron-rich nuclei near N=14

Author

Díaz Fernández, P, Alvarez-Pol, H., Crespo, R, Cravo, E, Atar, L., Deltuva, A., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K, Borge, M. J. G., Caamaño, M., Cabanelas, P., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F, Fernández-Domínguez, B, Fraile Prieto, Luis Mario, 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., Jurčiukonis, D., 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., Marganiec, J., Moro, A. M., Movsesyan, A., Nacher, E, Najafi, A., Nikolskii, E., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietras, B., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., Zuber, K, Díaz Fernández, P, Alvarez-Pol, H., Crespo, R, Cravo, E, Atar, L., Deltuva, A., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K, Borge, M. J. G., Caamaño, M., Cabanelas, P., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F, Fernández-Domínguez, B, Fraile Prieto, Luis Mario, 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., Jurčiukonis, D., 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., Marganiec, J., Moro, A. M., Movsesyan, A., Nacher, E, Najafi, A., Nikolskii, E., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietras, B., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Wheldon, Wilson, G., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K

Abstract

©2018 American Physical Society, Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The R^3B collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable 12^C beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p,pn) and (p,2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N=14 to N=15. Method: The structure of the projectiles 23^O, 22^O, and 21^N has been studied simultaneously via (p,pn) and (p,2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the R^3B-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p,pn) and (p,2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p,pn) channels, indications of a change in the structure of these nuclei moving from N=14 to N=15 have been observed, i.e., from the 0d_5/2 shell to the 1_s1/2. This supports previous observations of a subshell closure at N=14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes., NuPNET ERA-NET within the NuPNET GANAS, German Federal Ministry for Education and Research (BMBF), Unión Europea. FP7, Fundação para a Ciência e a Tecnologia (FCT), Research Council of Lithuania, Ministerio de Economia y Competitividad (MINECO), Unión Europea. H2020, United States Department of Energy (DOE), National Science Foundation (NSF), Swedish Research Council, Depto. de Estructura de la Materia, Física Térmica y Electrónica, Fac. de Ciencias Físicas, Instituto de Física de Partículas y del Cosmos (IPARCOS), TRUE, pub

Published
2018

49. Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Author

Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Diaz Fernandez, P., Holl, M., Najafi, M. A., Panin, V., Alvarez-Pol, H., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz Redondo, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kroell, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nacher, E., Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D. M., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P., 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., Atar, L., Paschalis, S., Barbieri, C., Bertulani, C. A., Diaz Fernandez, P., Holl, M., Najafi, M. A., Panin, V., Alvarez-Pol, H., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Galaviz Redondo, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kahlbow, J., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knyazev, A., Kroell, T., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec-Galazka, J., Movsesyan, A., Nacher, E., Nikolskii, E. Y., Nilsson, T., Nociforo, C., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Ribeiro, G., Rigollet, C., Rossi, D. M., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Tengblad, O., Thies, R., Togano, Y., Vandebrouck, M., Velho, P., 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

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the (RB)-B-3/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type O-A(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

Published
2018

50. Structure of Be-13 studied in proton knockout from B-14

Author

Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V, Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Dillmann, I, Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kroell, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V, Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I, Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M., V, Zilges, A., Zuber, K., Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V, Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Dillmann, I, Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kroell, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V, Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I, Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M., V, Zilges, A., and Zuber, K.

Abstract

The neutron-unbound isotope Be-13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be-13 structure, is a challenge, particularly in light of its bridging role between Be-12, where the N = 8 neutron shell breaks down, and the Borromean halo nucleus Be-14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be-12 after proton knockout from B-14, by measuring coincidences between Be-12, neutrons, and gamma rays originating from de-excitation of states fed by neutron decay of Be-13. The Be-13 isotopes were produced in proton knockout from a 400 MeV/nucleon B-14 beam impinging on a CH2 target. The Be-12-n relative-energy spectrum d sigma/dE(fn) was obtained from coincidences between Be-12(g.s.) and a neutron, and also as threefold coincidences by adding gamma rays, from the de-excitation of excited states in Be-12. Neutron decay from the first 5/2(+) state in Be-13 to the 2(+) state in Be-12 at 2.11 MeV is confirmed. An energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon B-14 beam. A low-lying p-wave resonance in Be-13(1/2(-)) is confirmed by comparing proton- and neutron-knockout data from B-14 and Be-14.

Published
2018

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