Features of the Fission Fragments Formed in the Heavy Ion induced + reaction near the interaction barrier

E. M. Kozulin; I. M. Harca; E. Vardaci; I. Matea; A. Maj; I. Itkis; G. Knyazheva; K. Novikov; O. Dorvaux; M. Ciemala; S. Brambilla; N. Kozulina; I. V. Kolesov; E. Saveleva; V. V. Kirakosyan; C. Schmitt; C. Borcea; S. Calinescu; C. Petrone; M. Ashaduzzaman; B. DeCanditiis; A. Pulcini; D. Quero; P. Rath; A. di Nitto; G. La Rana; A. Bracco; F. Camera; O. Stezowski; J. Wilson; D. Verney; W. H. Trzaska

doi:10.1140/epja/s10050-019-00019-5

2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2020) 56: 6
https://doi.org/10.1140/epja/s10050-019-00019-5

Regular Article - Experimental Physics

Features of the Fission Fragments Formed in the Heavy Ion induced $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ reaction near the interaction barrier

E. M. Kozulin¹, I. M. Harca¹^,9^*, E. Vardaci²^,3, I. Matea⁴, A. Maj⁵, I. Itkis¹, G. Knyazheva¹, K. Novikov¹, O. Dorvaux⁶, M. Ciemala⁵, S. Brambilla⁷, N. Kozulina¹, I. V. Kolesov¹, E. Saveleva¹, V. V. Kirakosyan¹, C. Schmitt⁶, C. Borcea⁹, S. Calinescu⁹, C. Petrone⁹, M. Ashaduzzaman²^,3, B. DeCanditiis²^,3, A. Pulcini²^,3, D. Quero²^,3, P. Rath²^,3, A. di Nitto²^,3, G. La Rana²^,3, A. Bracco⁷^,8, F. Camera⁷^,8, O. Stezowski⁷^,8, J. Wilson⁴, D. Verney⁴, W. H. Trzaska¹⁰ and SPS and the PARIS collaboration

¹ Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russia
² Dipartimento di Fisica “E. Pancini”, Universita’ di Napoli “FedericoII”, Naples, Italy
³ Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Naples, Italy
⁴ IPN, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
⁵ Institute of Nuclear Physics PAN, Krakow, Poland
⁶ IPHC, CNRS/IN2P3, Université de Strasbourg, 67037, Strasbourg, France
⁷ Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milan, Italy
⁸ Università di Milano, Milan, Italy
⁹ Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering (IFIN-HH), Magurele, Bucharest, Romania
¹⁰ Accelerator Laboratory of University of Jyväskylä (JYFL), Jyväskylä, Finland

^* e-mail: harca@jinr.ru

Received: 20 August 2019
Accepted: 10 November 2019
Published online: 10 January 2020

Abstract

The features of fission fragments formed in the near barrier reaction $^{32}\hbox {S}$ + $^{197}\hbox {Au}$ ( $E^\mathrm{lab}_\mathrm{beam}=166\,\hbox {MeV}$ ) are investigated. The measurement was performed at the ALTO facility of IPN Orsay, France, with the aim of clarifying the quantitative contribution of the quasi-fission process to the total fission events. The mass and total kinetic energy of the fission fragments were compared to the expectations of the liquid drop model, revealing an asymmetric fission component which may be traced back to a quasi-fission process mixed with the fusion–fission events. The $\gamma$ -rays and neutrons measured in coincidence with the fission fragments were used to yield additional information for the discrimination of the two aforementioned mechanisms. All observed trends are consistent and fairly well reproduced by the statistical model.