General Info
| Field | Value |
|---|---|
| Experiment Number | e851_21 |
| Title | Origin and competition between fission modes in pre-actinides |
| Spokeperson(s) |
Antoine, Lemasson
Christelle, Schmitt
Igor, Tsekhanovich
Andrei, Andreyev
|
| Data Manager(s) | |
| GANIL Scientific Coordinator | |
| Collection Dates (dd-mm-yy) |
Start: 24-05-2024 End: 07-06-2024 |
| End of Embargo | 07-06-2027 |
| DOI | 10.26143/ganil-2024-e851_21 |
| DOI State | registered |
| Publication Year | 2024 |
| Publisher | GANIL, Large Heavy Ion National Accelerator, Caen, France |
| Data Curator |
|
| Hosting Institution | |
| Size | 8.0 TB |
Experiment details
Abstract
The goal of this experiment is to take advantage of the assets of the GANIL facility to obtain further insight into low-energy fission of pre-actinides. Fission of 184Pb was induced by fusion in inverse kinematics. The reaction 124Xe+60Ni was used at near-barrier energy (ELab=4.07–4.29 MeV/u) leading to a compound-nucleus excitation energy of E*=24-32 MeV. The different beam energies were obtained starting from 4.38 MeV/u beam thank to variable stripper foils thicknesses placed after CSS1. A moderate E* is required to be able to evidence shell effects. The coincident measurement of the two fission products was achieved with the heavy-ion spectrometer VAMOS++ coupled to a second detection arm (SDA). The fragment entering VAMOS++ were uniquely identified in post-neutron mass A1 (after its cooling by neutron evaporation after scission), in nuclear charge Z1, and its velocity vector (v1, ϑ1, ϕ1) at the target position and kinetic energy E1 was measured. The SDA arm will provide a measurement of the velocity vector (v2, ϑ2, ϕ2) and kinetic energy E2 of the coincident fragment. Based on the 2v method the pre-neutron masses A1,2 (of the fragments as produced at scission, before evaporation), and the pre-neutron total kinetic energy (TKE) will also be determined. Finally, combining the pre- and post-neutron information, the prompt neutron multiplicity Mn can be computed, as well as the fragment neutron-richness N/Z at the moment of scission.
Setup
| Setup | VAMOS + Second Detection Arm (SDA) |
|---|
Beam(s)
| Ion(s) | Charge state | Energy | Energy unit | Av. intensity | Intensity unit | Purity (%) | Accelerator | Production |
|---|---|---|---|---|---|---|---|---|
| 124Xe | 40+ | 4.28716 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
| 124Xe | 40+ | 4.21752 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
| 124Xe | 40+ | 4.20515 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
| 124Xe | 40+ | 4.07742 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
| 124Xe | 40+ | 4.06660 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
| 124Xe | 40+ | 4.28689 | MeV/u | 1.e+9 | pps | 100 | Stable | Cyclotrons |
Target(s)
| Material | Thickness | Thickness unit | Sample phase | Type |
|---|---|---|---|---|
| 60Ni | 0.1 | mg/cm2 | Solid | Isotope |
| natZr | 0.5 | mg/cm2 | Solid | Isotope |
| 54Fe | 0.970 | mg/cm2 | Solid | Isotope |
Studied reaction(s)
| Name | Projectile | Target |
|---|---|---|
| 124Xe (4.28716 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.28716 MeV/u | 60Ni (0.1 mg/cm2) |
| 124Xe (4.21752 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.21752 MeV/u | 60Ni (0.1 mg/cm2) |
| 124Xe (4.20515 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.20515 MeV/u | 60Ni (0.1 mg/cm2) |
| 124Xe (4.07742 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.07742 MeV/u | 60Ni (0.1 mg/cm2) |
| 124Xe (4.06660 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.06660 MeV/u | 60Ni (0.1 mg/cm2) |
| 124Xe (4.28689 MeV/u, q=40+, I=1.e+9 pps) + 60Ni (0.1 mg/cm2) | 124Xe(40+) @ 4.28689 MeV/u | 60Ni (0.1 mg/cm2) |
Contributors
| Given Name | Family Name | Id. | Affiliation(s) |
|---|---|---|---|
| Andrei | Andreyev |
|
University of York, York, United Kingdom
|
| Lucas | Bégué-Guillou |
GANIL, Caen, France
|
|
| Youngju | Cho |
|
SNU, Seoul, South Korea
|
| Caterina | Ciampi |
|
GANIL, Caen, France
|
| Michal | Ciemala |
|
IFJ PAN, Krakow, Poland
|
| Emmanuel | Clément |
|
GANIL, Caen, France
|
| Alex | Cobo Zarzuelo |
|
GANIL, Caen, France
|
| Serge | Czajkowski |
CENBG, Bordeaux, France
|
|
| François | Didierjean |
|
IPHC, Strasbourg, France
|
| Gilbert | Duchêne |
|
IPHC, Strasbourg, France
|
| Jérémie | Dudouet |
|
IP2I, Lyon, France
|
| Beatriz | Errandonea Félix |
|
USC, Santiago de Compostela, Spain
IGFAE, Instituto Galego de Física de Altas Enerxías, Santiago de Compostela, Spain
|
| Alexis | Francheteau |
|
GANIL, Caen, France
|
| John | Frankland |
|
GANIL, Caen, France
|
| Diego | Gruyer |
|
LPC CAEN, Caen, France
|
| Indu | Jangid |
|
GANIL, Caen, France
|
| Katarzyna | Mazurek |
|
IFJ PAN, Krakow, Poland
|
| Deby Treasa | Kattikat Melcom |
|
GANIL, Caen, France
|
| Yung Hee | Kim |
|
CENS-IBS, Daejeon, South Korea
|
| Neeraj | Kumar |
IPHC, Strasbourg, France
|
|
| Antoine | Lemasson |
|
GANIL, Caen, France
|
| Olivier | Dorvaux |
|
IPHC, Strasbourg, France
|
| Diego | Ramos |
|
GANIL, Caen, France
|
| Maurycy | Rejmund |
|
GANIL, Caen, France
|
| Masaki | Sasano |
|
RIKEN, Wako, Japan
|
| Christelle | Schmitt |
|
IPHC, Strasbourg, France
|
| Hemantika | Sengar |
|
GANIL, Caen, France
|
| Ota | Shuya |
|
BNL, Upton, United States
|
| Taiki | Tanaka |
GANIL, Caen, France
|
|
| Igor | Tsekhanovich |
CENBG, Bordeaux, France
|
Institutes
| Name | Id. |
|---|---|
| GANIL, CEA/DRF-CNRS/IN2P3, Caen, France |
|
| IPHC, CNRS/IN2P3 Strasbourg, France |
|
| University of York, York, United Kingdom |
|
| CENBG, CNRS/IN2P3 Bordeaux, France |
|
| Seoul National University, Seoul, South Korea |
|
| Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland |
|
| Institute for Basic Science, Daejeon, South Korea |
|
| RIKEN, Wako, Japan |
|
| Brookhaven National Laboratory, Upton, United States |
|
| Institut de Physique des 2 Infinis de Lyon, Lyon, France |
|
| University of Santiago de Compostela, Santiago de Compostela, Spain |
|
| Laboratoire de Physique Corpusculaire de Caen |
|