Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi mathvariant="normal">Sn</mi><mprescripts></mprescripts><none></none><mrow><mn>124</mn></mrow></mmultiscripts><mo>+</mo><mmultiscripts><mi mathvariant="normal">Ni</mi><mprescripts></mprescripts><none></none><mrow><mn>64</mn></mrow></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi mathvariant="normal">Sn</mi><mprescripts></mprescripts><none></none><mrow><mn>112</mn></mrow></mmultiscripts><mo>+</mo><mmultiscripts><mi mathvariant="normal">Ni</mi><mprescripts></mprescripts><none></none><mrow><mn>58</mn></mrow></mmultiscripts></math> collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>35</mn><mspace width="4pt"></mspace><mi>A</mi></mrow></math> MeV

P. Russotto; E. De Filippo; A. Pagano; L. Acosta; L. Auditore; V. Baran; I. Berceanu; B. Borderie; R. Bougault; M. Bruno; T. Cap; G. Cardella; S. Cavallaro; M. B. Chatterjee; A. Chbihi; M. Colonna; M. D'Agostino; M. Di Toro; L. Francalanza; J. Frankland; E. Galichet; W. Gawlikowicz; E. Geraci; B. Gnoffo; A. Grzeszczuk; P. Guazzoni; S. Kowalski; G. Lanzalone; G. Lanzanò; N. Le Neindre; I. Lombardo; C. Maiolino; T. Minniti; E. V. Pagano; M. Papa; E. Piasecki; S. Pirrone; R. Płaneta; G. Politi; F. Porto; L. Quattrocchi; M. F. Rivet; E. Rosato; F. Rizzo; K. Schmidt; K. Siwek-Wilczyńska; I. Skwira-Chalot; A. Trifirò; M. Trimarchi; G. Verde; M. Vigilante; J. P. Wieleczko; J. Wilczyński; L. Zetta; W. Zipper

doi:10.1103/PhysRevC.91.014610

Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in ${}^{124}{Sn} + {}^{64}{Ni}$ and ${}^{112}{Sn} + {}^{58}{Ni}$ collisions at $35 A$ MeV

P. Russotto^1,*, E. De Filippo¹, A. Pagano¹, L. Acosta², L. Auditore³, V. Baran⁴, I. Berceanu⁵, B. Borderie⁶, R. Bougault⁷ et al.

M. Bruno⁸, T. Cap⁹, G. Cardella¹, S. Cavallaro^2,10, M. B. Chatterjee¹¹, A. Chbihi¹², M. Colonna², M. D'Agostino⁸, M. Di Toro^2,10, L. Francalanza^2,10, J. Frankland¹², E. Galichet^6,13, W. Gawlikowicz¹⁴, E. Geraci^1,10, B. Gnoffo^1,10, A. Grzeszczuk¹⁵, P. Guazzoni¹⁶, S. Kowalski¹⁵, G. Lanzalone^2,17, G. Lanzanò^1,†, N. Le Neindre⁷, I. Lombardo¹⁸, C. Maiolino², T. Minniti¹, E. V. Pagano^2,10, M. Papa¹, E. Piasecki^19,20, S. Pirrone¹, R. Płaneta²¹, G. Politi^1,10, F. Porto^2,10, L. Quattrocchi³, M. F. Rivet⁶, E. Rosato¹⁸, F. Rizzo^2,10, K. Schmidt¹⁵, K. Siwek-Wilczyńska⁹, I. Skwira-Chalot⁹, A. Trifirò³, M. Trimarchi³, G. Verde¹, M. Vigilante¹⁸, J. P. Wieleczko¹², J. Wilczyński²⁰, L. Zetta¹⁶, and W. Zipper¹⁵

¹INFN, Sezione di Catania, Italy
²INFN, Laboratori Nazionali del Sud, Catania, Italy
³INFN, Gruppo Collegato di Messina and Dip. di Fisica, Univ. di Messina, Italy
⁴Physics Faculty, University of Bucharest, Romania
⁵National Institute of Physics and Nuclear Engineering “Horia Hulubei,” Bucharest, Romania
⁶Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud 11, Orsay, France
⁷LPC Caen, ENSICAEN, University of Caen, CNRS/IN2P3, Caen France
⁸INFN, Sezione di Bologna and Dipartimento di Fisica, Univ. di Bologna, Italy
⁹Faculty of Physics, University of Warsaw, Warsaw, Poland
¹⁰Dipartimento di Fisica e Astronomia, Univ. di Catania, Catania, Italy
¹¹Saha Institute of Nuclear Physics, Kolkata, India
¹²GANIL (DSM-CEA/CNRS/IN2P3), Caen, France
¹³Conservatoire National des Arts et Métiers, F-75141 Paris Cedex 03, France
¹⁴Cardinal Stefan Wyszyński University, Warsaw, Poland
¹⁵Institute of Physics, University of Silesia, Katowice, Poland
¹⁶INFN, Sezione di Milano and Dipartimento di Fisica, Univ. di Milano, Italy
¹⁷“Kore” Università di Enna, Enna, Italy
¹⁸INFN, Sezione di Napoli and Dipartimento di Fisica, Univ. di Napoli, Italy
¹⁹Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland
²⁰National Centre for Nuclear Research, Świerk/Warsaw, Poland
²¹M. Smoluchowski Institute of Physics, Jagellonian Univ., Cracow, Poland

^*russotto@lns.infn.it
^†Deceased.

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Phys. Rev. C 91, 014610 – Published 21 January, 2015

DOI: https://doi.org/10.1103/PhysRevC.91.014610

Abstract

Background: In heavy-ion collisions at intermediate energies the production of light charged particles and intermediate mass fragments (IMFs) is due to different reaction mechanisms and different time scales, ranging from fast dynamical processes to statistical emission from the equilibrated system.

Purpose: We compare the IMF statistical and dynamical emission probabilities in collisions of a neutron-rich ${}^{124}{Sn} + {}^{64}{Ni}$ system and a neutron-poor ${}^{112}{Sn} + {}^{58}{Ni}$ system at the laboratory energy of 35 $A$ MeV.

Method: The IMFs production mechanism in semiperipheral reactions has been investigated in our previous works. In this paper, the analysis is expanded for the same set of data and production cross sections have been evaluated for dynamical and statistical emission in a coherent way for light and heavy fragments.

Results: The data analysis has evidenced a strong competition between dynamical and statistical emission mechanisms. Probability of the dynamical emission of IMFs is strongly influenced by the ( $N / Z$ ) ratio of the colliding system.

Conclusions: It is demonstrated that the statistical emission is equally probable for the two systems, while the dynamical emission is enhanced for the neutron-rich system, especially for heavy fragments ( $Z \geq 6$ ). The observed effect points at a high sensitivity of the prompt-dynamical emission to the ( $N / Z$ ) ratio of a given system.

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Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in ${}^{124}{Sn} + {}^{64}{Ni}$ and ${}^{112}{Sn} + {}^{58}{Ni}$ collisions at $35 A$ MeV

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Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in Sn124+Ni64 and Sn112+Ni58 collisions at 35A MeV

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Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in ${}^{124}{Sn} + {}^{64}{Ni}$ and ${}^{112}{Sn} + {}^{58}{Ni}$ collisions at $35 A$ MeV