General Info
| Field | Value |
|---|---|
| Experiment Number | e881_23 |
| Title | Measurement of the 12C Hoyle state radius via double-excitation inelastic scattering |
| Spokeperson(s) |
Diego, Gruyer
Daniele, Dell'Aquila
|
| Data Manager(s) |
Diego, Gruyer
John, Frankland
|
| GANIL Scientific Coordinator | |
| Collection Dates (dd-mm-yy) |
Start: 12-04-2025 End: 18-04-2025 |
| End of Embargo | 18-04-2028 |
| DOI | 10.26143/ganil-2025-e881_23 |
| DOI State | findable |
| Publication Year | 2025 |
| Publisher | GANIL, Large Heavy Ion National Accelerator, Caen, France |
| Data Curator |
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Hosting Institution |
(CC-IN2P3) IN2P3’s Computing Centre, Villeurbanne, France
|
| Size | 1.45 TB |
Experiment details
Abstract
The detailed properties of 12C second 0+ excited state, known as the Hoyle state, are both a challenge for nuclear structure theory and have a key role in the synthesis of elements. We propose to measure the mean matter radius of this state by analysing the diffraction structure of single- and double-excitation in 12C+12C inelastic scattering at 105 MeV beam energy. The experimental setup consists in the coupling of FAZIA and INDRA multi detectors. Few nuclear excited states have attracted the interest of the scientific community as much as the 12C Hoyle state (second 0+ state at 7.65 MeV excitation energy), which is remarkable in many respects: aside from its key role in the synthesis of 12C, its description remains a challenge for nuclear structure theory. In nuclear structure, the Hoyle state is crucial to understand clustering in nuclei. Theoretical calculations show different hypotheses regarding its spatial configuration but most of them predict a strongly developed 3-alphas structure and a matter radius significantly larger than 12C ground state. In recent years, many experimental efforts have been made to characterize the Hoyle state decay properties and the rotational band built on top of it. However, only a few attempts to access experimentally the Hoyle state radius have been made, mostly using inelastic scattering of electrons, protons and light nuclei (up to 12C) on 12C target. We propose here to measure the Hoyle state radius by comparing single- and double-excitation in 12C+12C inelastic scattering.
Setup
| Setup | INDRA (14°-176°) - FAZIA (1.5°-12.5°) |
|---|
Beam(s)
| Ion(s) | Charge state | Energy | Energy unit | Av. intensity | Intensity unit | Purity (%) | Accelerator | Production |
|---|---|---|---|---|---|---|---|---|
| 12C | 6+ | 13.75 | MeV/u | 1.e+8 | pps | 100 | Stable | Cyclotrons |
| 12C | 6+ | 8.75 | MeV/u | 1.e+8 | pps | 100 | Stable | Cyclotrons |
| 12C | 6+ | 8.79 | MeV/u | 1.e+8 | pps | 100 | Stable | Cyclotrons |
| 12C | 6+ | 8.81 | MeV/u | 1.e+8 | pps | 100 | Stable | Cyclotrons |
Target(s)
| Material | Thickness | Thickness unit | Sample phase | Type |
|---|---|---|---|---|
| 197Au | 0.200 | mg/cm2 | Solid | Isotope |
| 12C | 0.371 | mg/cm2 | Solid | Isotope |
| 197Au | 0.374 | mg/cm2 | Solid | Isotope |
| 12C | 0.2385 | mg/cm2 | Solid | Isotope |
| CH2 | 0.180 | mg/cm2 | Solid | Isotope |
Studied reaction(s)
| Name | Projectile | Target |
|---|---|---|
| 12C (8.79 MeV/u, q=6+, I=1.e+8 pps) + 197Au (0.200 mg/cm2) | 12C(6+) @ 8.79 MeV/u | 197Au (0.200 mg/cm2) |
| 12C (8.81 MeV/u, q=6+, I=1.e+8 pps) + 197Au (0.200 mg/cm2) | 12C(6+) @ 8.81 MeV/u | 197Au (0.200 mg/cm2) |
| 12C (8.79 MeV/u, q=6+, I=1.e+8 pps) + 12C (0.371 mg/cm2) | 12C(6+) @ 8.79 MeV/u | 12C (0.371 mg/cm2) |
| 12C (8.79 MeV/u, q=6+, I=1.e+8 pps) + 197Au (0.374 mg/cm2) | 12C(6+) @ 8.79 MeV/u | 197Au (0.374 mg/cm2) |
| 12C (8.81 MeV/u, q=6+, I=1.e+8 pps) + 12C (0.371 mg/cm2) | 12C(6+) @ 8.81 MeV/u | 12C (0.371 mg/cm2) |
| 12C (8.81 MeV/u, q=6+, I=1.e+8 pps) + 12C (0.2385 mg/cm2) | 12C(6+) @ 8.81 MeV/u | 12C (0.2385 mg/cm2) |
| 12C (8.81 MeV/u, q=6+, I=1.e+8 pps) + CH2 (0.180 mg/cm2) | 12C(6+) @ 8.81 MeV/u | CH2 (0.180 mg/cm2) |
Contributors
| Given Name | Family Name | Id. | Affiliation(s) |
|---|---|---|---|
| Lucia | Baldesi |
|
(INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy
University of Florence, Florence, Italy
|
| Sandro | Barlini |
|
University of Florence, Florence, Italy
|
| Jose | Benlliure |
|
(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
|
| Eric | Bonnet |
|
(SUBATECH) Laboratoire de Physique Subatomique et des Technologies Associées, Nantes, France
|
| Bernard | Borderie |
|
Laboratory of the Physics of the Two Infinities Irène Joliot-Curie, Orsay, France
|
| Rémi | Bougault |
|
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
(ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France
|
| Alberto | Camaiani |
|
University of Florence, Florence, Italy
(INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy
|
| Giovanni | Casini |
(INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy
|
|
| Abdelouahed | Chbihi |
|
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Caterina | Ciampi |
|
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Franck | Delaunay |
|
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
|
| Daniele | Dell'Aquila |
|
University of Naples Federico II, Naples, Italy
|
| José Antonio | Dueñas Díaz |
|
(UHU) University of Huelva, Huelva, Spain
|
| Quentin | Fable |
|
Grand Accélérateur National d'Ions Lourds, Caen, France
(L2IT) Laboratoire des 2 Infinis Toulouse, Toulouse, France
|
| John | Frankland |
|
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Diego | Gruyer |
|
(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
|
| Maxime | Henri |
|
Institut national des sciences et techniques nucléaires, Gif-sur-Yvette, France
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Byungsik | Hong |
|
Korea University, Department of Physics, Seoul, Republic of Korea
|
| Sunji | Kim |
(IBS) Institute for Basic Science, Daejeon, South Korea
|
|
| Min Jung | Kweon |
Inha University, Incheon, South Korea
|
|
| Nicolas | Le Neindre |
|
(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
|
| Ivano | Lombardo |
|
(INFN-CT) National Institute for Nuclear Physics, Catania Division, Catania, Italy
|
| Olivier | Lopez |
|
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
|
| Katarzyna | Mazurek |
|
Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
|
| Marian | Parlog |
|
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
|
| Maria Grazia | Pellegriti |
|
(INFN-CT) National Institute for Nuclear Physics, Catania Division, Catania, Italy
|
| Silvia | Piantelli |
|
(INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy
|
| Alex | Rebillard-Soulié |
|
(UNICAEN) University of Caen Normandy, Caen, France
(ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
|
| Thomas | Roger |
|
Grand Accélérateur National d'Ions Lourds, Caen, France
|
| Simone | Valdre' |
|
(INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy
|
| Antonin | Valente |
(UNICAEN) University of Caen Normandy, Caen, France
(ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
|
|
| Giuseppe | Verde |
|
(INFN-CT) National Institute for Nuclear Physics, Catania Division, Catania, Italy
|
| Emmanuel | Vient |
|
(UNICAEN) University of Caen Normandy, Caen, France
(LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France
(ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France
Institut National de Physique Nucléaire et de Physique des Particules, Paris, France
|
Institutes
| Name | Id. |
|---|---|
| (LPC CAEN) Laboratoire de Physique Corpusculaire de Caen, Caen, France |
|
| (UNICAEN) University of Caen Normandy, Caen, France |
|
| (ENSICAEN) École Nationale Supérieure d'Ingénieurs de Caen, Caen, France |
|
| Institut National de Physique Nucléaire et de Physique des Particules, Paris, France |
|
| University of Naples Federico II, Naples, Italy |
|
| (INFN-FI) National Institute for Nuclear Physics, Florence Division, Sesto Fiorentino, Italy |
|
| University of Florence, Florence, Italy |
|
| (USC) University of Santiago de Compostela, Santiago de Compostela, Spain |
|
| (SUBATECH) Laboratoire de Physique Subatomique et des Technologies Associées, Nantes, France |
|
| Laboratory of the Physics of the Two Infinities Irène Joliot-Curie, Orsay, France |
|
| Grand Accélérateur National d'Ions Lourds, Caen, France |
|
| (UHU) University of Huelva, Huelva, Spain |
|
| (L2IT) Laboratoire des 2 Infinis Toulouse, Toulouse, France |
|
| (INFN-LNL) National Institute for Nuclear Physics, Legnaro National Laboratories, Legnaro, Italy |
|
| Korea University, Department of Physics, Seoul, Republic of Korea |
|
| (IBS) Institute for Basic Science, Daejeon, South Korea |
|
| Inha University, Incheon, South Korea |
|
| (INFN-CT) National Institute for Nuclear Physics, Catania Division, Catania, Italy |
|
| Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland |
|
| Institut national des sciences et techniques nucléaires, Gif-sur-Yvette, France |
|
Citation
e881_23 Collaboration, e881_23 GANIL dataset (2025). doi:https://doi.org/10.26143/ganil-2025-e881_23.