Universität zu Köln

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., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., 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, H. T., 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, 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., Roeder, M., Rossi, D., Savran, D., Scheit, H., Schwenk, A., 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. (2017). Effective proton-neutron interaction near the drip line from unbound states in F-25,F-26. Phys. Rev. C, 96 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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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 F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 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 F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. 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 F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, 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 F-25,F-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 F-26.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vandebrouck, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lepailleur, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sorlin, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aumann, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caesar, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Holl, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Panin, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wamers, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stroberg, S. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Holt, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Santos, F. de Oliveira UNSPECIFIED UNSPECIFIED UNSPECIFIED Alvarez-Pol, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Atar, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Avdeichikov, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beceiro-Novo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bemmerer, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Benlliure, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bertulani, C. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bogner, S. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boillos, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boretzky, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borge, M. J. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caamano, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Casarejos, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Catford, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cederkall, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chartier, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chulkov, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cortina-Gil, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cravo, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crespo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pramanik, U. Datta UNSPECIFIED UNSPECIFIED UNSPECIFIED Diaz Fernandez, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dillmann, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elekes, Z. UNSPECIFIED UNSPECIFIED UNSPECIFIED Enders, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ershova, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Estrade, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Farinon, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fraile, L. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Freer, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Galaviz, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Geissel, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gernhaeuser, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gibelin, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Golubev, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goebel, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hagdahl, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heftrich, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heil, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heine, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heinz, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henriques, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hergert, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hufnagel, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ignatov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johansson, H. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jonson, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kahlbow, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kalantar-Nayestanaki, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kanungo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kelic-Heil, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knyazev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kroll, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurz, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Labiche, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Langer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Le Bleis, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lemmon, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lindberg, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Machado, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marganiec, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marques, F. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Movsesyan, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nacher, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Najafi, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nikolskii, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nilsson, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nociforo, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paschalis, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perea, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petri, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietri, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Plag, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reifarth, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ribeiro, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rigollet, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roeder, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rossi, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savran, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheit, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schwenk, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Simon, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Syndikus, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Taylor, J. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tengblad, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thies, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Togano, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Velho, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Volkov, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Weick, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wheldon, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winfield, J. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Woods, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yakorev, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhukov, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zuber, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211370
DOI:	10.1103/PhysRevC.96.054305
Journal or Publication Title:	Phys. Rev. C
Volume:	96
Number:	5
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RICH NUCLEI; DETECTOR Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21137