Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes
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.
Keywords
Cite
@article{arxiv.1603.00323,
title = {Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes},
author = {R. Thies and A. Heinz and T. Adachi and Y. Aksyutina and J. Alcantara-Núñes and S. Altstadt and H. Alvarez-Pol and N. Ashwood and T. Aumann and V. Avdeichikov and M. Barr and S. Beceiro-Novo and D. Bemmerer and J. Benlliure and C. A. Bertulani and K. Boretzky and M. J. G. Borge and G. Burgunder and M. Caamano and C. Caesar and E. Casarejos and W. Catford and J. Cederkäll and S. Chakraborty and M. Chartier and L. V. Chulkov and D. Cortina-Gil and R. Crespo and U. Datta and P. Díaz Fernández and I. Dillmann and Z. Elekes and J. Enders and O. Ershova and A. Estradé and F. Farinon and L. M. Fraile and M. Freer and M. Freudenberger and H. O. U. Fynbo and D. Galaviz and H. Geissel and R. Gernhäuser and K. Göbel and P. Golubev and D. Gonzalez Diaz and J. Hagdahl and T. Heftrich and M. Heil and M. Heine and A. Henriques and M. Holl and G. Ickert and A. Ignatov and B. Jakobsson and H. T. Johansson and B. Jonson and N. Kalantar-Nayestanaki and R. Kanungo and R. Knöbel and T. Kröll and R. Krücken and J. Kurcewicz and N. Kurz and M. Labiche and C. Langer and T. Le Bleis and R. Lemmon and O. Lepyoshkina and S. Lindberg and J. Machado and J. Marganiec and V. Maroussov and M. Mostazo and A. Movsesyan and A. Najafi and T. Nilsson and C. Nociforo and V. Panin and S. Paschalis and A. Perea and M. Petri and S. Pietri and R. Plag and A. Prochazka and A. Rahaman and G. Rastrepina and R. Reifarth and G. Ribeiro and M. V. Ricciardi and C. Rigollet and K. Riisager and M. Röder and D. Rossi and J. Sanchez del Rio and D. Savran and H. Scheit and H. Simon and O. Sorlin and V. Stoica and B. Streicher and J. T. Taylor and O. Tengblad and S. Terashima and Y. Togano and E. Uberseder and J. Van de Walle and P. Velho and V. Volkov and A. Wagner and F. Wamers and H. Weick and M. Weigand and C. Wheldon and G. Wilson and C. Wimmer and J. S. Winfield and P. Woods and D. Yakorev and M. V. Zhukov and A. Zilges and K. Zuber},
journal= {arXiv preprint arXiv:1603.00323},
year = {2016}
}