General Info
| Field | Value |
|---|---|
| Experiment Number | e900_24 |
| Title | Novel insight into quasi-fission for advancing the understanding of reaction dynamics |
| Spokeperson(s) |
Christelle , Schmitt
Manuel, Caamano
|
| Data Manager(s) |
Christelle , Schmitt
Manuel, Caamano
|
| GANIL Scientific Coordinator | |
| Collection Dates (dd-mm-yy) |
Start: 19-03-2026 End: 31-03-2026 |
| End of Embargo | 31-03-2029 |
| DOI |
10.26143/ganil-2026-e900_24
|
| DOI State | registered |
| Publication Year | 2026 |
| Publisher | GANIL, Large Heavy Ion National Accelerator, Caen, France |
| Data Curator |
|
| Hosting Institution | |
| Size | 1.2 TB |
Experiment details
Abstract
In heavy-ion collisions around the Coulomb barrier, an out-of-equilibrium mechanism, called quasi-fission, contributes to a substantial part of the reaction cross section. In this process, the projectile and target stick together for a certain time, during which sizeable transfer of mass between the reactants and complete damping of the initial kinetic energy can occur. However, the di-nuclear system re-separates before reaching a fully equilibrated compound nucleus, and two fission-like fragments emerge. Although most studies of the process were restricted to the "practical" context of super heavy element production, it was realized recently that better understanding quasi-fission is also an ideal laboratory for improving our knowledge on nuclear dynamics. Intense campaigns of measurements were undertaken during the past decade in this respect. Key conclusions regarding the influence of the entrance channel properties on the probability of quasi-fission to occur were drawn. Nevertheless, what drives the fragment partition in quasi-fission and what are the properties of the emerging fragments is still unclear. This is mainly due to the limited variety of available experimental observables, principally mass-angle and energy correlations. The goal of this project is to take advantage of the unique assets of the GANIL facility to obtain further insight into the dynamics of quasi-fission by providing completely new observables. We propose to study 186W+54Cr collisions close to the barrier, and identify for the first time isotopically in (N, Z) the quasi-fission fragments on top of their mass-angle distribution. To that goal, an innovative set up, exploiting the performance of the heavy-ion VAMOS++ spectrometer enhanced with a second detection arm, will be used. The scan of the mass-angle landscape will permit to discriminate fast and slow quasi-fission, and thereby provide a chronometer for the reaction process. The approach will allow addressing in a model-independent way N/Z and energy equilibration time scales, and the development of the influence of shell effects and pairing correlations on the dynamical evolution of the system.
Setup
| Setup | EXOGAM - VAMOS - Fragment Partner Detector (FPD) |
|---|
Beam(s)
| Ion(s) | Charge state | Energy | Energy unit | Av. intensity | Intensity unit | Purity (%) | Accelerator | Production |
|---|---|---|---|---|---|---|---|---|
| 186W | 24+ | 5.06 | MeV/u | 1.e+8 | pps | 100 | Stable | Cyclotrons |
Target(s)
| Material | Thickness | Thickness unit | Sample phase | Type |
|---|---|---|---|---|
| 54Cr | 0.100 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.172 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.173 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.168 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.128 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.173 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.114 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.106 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.129 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.078 | mg/cm2 | Solid | Isotope |
| 54Cr | 0.106 | mg/cm2 | Solid | Isotope |
| natZr | 1 | μm | Solid | Isotope |
| 132Sn | 0.180 | mg/cm2 | Solid | Isotope |
| natTi | 0.130 | mg/cm2 | Solid | Isotope |
| natCr | 0.100 | mg/cm2 | Solid | Isotope |
| natCr | 0.270 | mg/cm2 | Solid | Isotope |
| natCr | 0.277 | mg/cm2 | Solid | Isotope |
| natCr | 0.310 | mg/cm2 | Solid | Isotope |
| natCr | 0.318 | mg/cm2 | Solid | Isotope |
| natCr | 0.468 | mg/cm2 | Solid | Isotope |
| natCr | 0.180 | mg/cm2 | Solid | Isotope |
| natCr | 0.215 | mg/cm2 | Solid | Isotope |
| natCr | 0.254 | mg/cm2 | Solid | Isotope |
Contributors
| Given Name | Family Name | Id. | Affiliation(s) |
|---|---|---|---|
| Christelle | Schmitt |
|
(IPHC) Hubert Curien Pluridisciplinary Institute, Strasbourg, France
|
| Manuel | Caamano |
|
(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
|
| Navin | Alahari |
|
Grand Accélérateur National d'Ions Lourds
|
| Dieter | Ackermann |
|
Grand Accélérateur National d'Ions Lourds
|
| Jacob | Buete |
|
(ANU) Australian National University, Canberra, Australia
|
| Emmanuel | Clement |
|
Grand Accélérateur National d'Ions Lourds
(CNRS) French National Centre for Scientific Research, Paris, France
Institut National de Physique Nucléaire et de Physique des Particules, Paris, France
|
| Alex | Cobo Zarzuelo |
|
Grand Accélérateur National d'Ions Lourds
|
| Olivier | Dorvaux |
|
University of Strasbourg, Strasbourg, France
(IPHC) Hubert Curien Pluridisciplinary Institute, Strasbourg, France
|
| François | Didierjean |
|
Hubert Curien Pluridisciplinary Institute
|
| Gilbert | Duchêne |
|
Hubert Curien Pluridisciplinary Institute
|
| John | Frankland |
|
Grand Accélérateur National d'Ions Lourds
|
| Diego | Gruyer |
|
Laboratoire de Physique Corpusculaire de Caen
Institut National de Physique Nucléaire et de Physique des Particules
University of Caen Normandy
École Nationale Supérieure d'Ingénieurs de Caen
|
| David | Hinde |
|
(ANU) Australian National University, Canberra, Australia
|
| Maria | Kmiecik |
|
Institute of Nuclear Physics, Polish Academy of Sciences
|
| Antoine | Lemasson |
|
Grand Accélérateur National d'Ions Lourds
|
| Joa | Ljungvall |
|
(IPHC) Hubert Curien Pluridisciplinary Institute, Strasbourg, France
|
| Adam | Maj |
|
Institute of Nuclear Physics, Polish Academy of Sciences
|
| Katarzyna | Mazurek |
|
Institute of Nuclear Physics, Polish Academy of Sciences
|
| Moukaddam | Mohamad |
|
University of Strasbourg, Strasbourg, France
(IPHC) Hubert Curien Pluridisciplinary Institute, Strasbourg, France
|
| Diego | Ramos |
|
Grand Accélérateur National d'Ions Lourds
|
| Maurycy | Rejmund |
|
Grand Accélérateur National d'Ions Lourds
|
| Sophie | Hayle |
(ANU) Australian National University, Canberra, Australia
|
Institutes
| Name | Id. |
|---|---|
| (IPHC) Hubert Curien Pluridisciplinary Institute, Strasbourg, France |
|
| (USC) University of Santiago de Compostela, Santiago de Compostela, Spain |
|
| Grand Accélérateur National d'Ions Lourds, Caen, France |
|
| (ANU) Australian National University, Canberra, Australia |
|
| Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland |
|
| (CNRS) French National Centre for Scientific Research, Paris, France |
|
| University of Strasbourg, Strasbourg, France |
|
| (LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France |
|
| Institut National de Physique Nucléaire et de Physique des Particules, Paris, France |
|
| (UNICAEN) University of Caen Normandy, Caen, France |
|
| (ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France |
|
| Normandie Université, Caen, France |
|
| (IBS) Institute for Basic Science, Daejeon, South Korea |
|
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