General Info

Field	Value
Experiment Number	e837_21
Title	12Be structure in multi-threshold vicinity: search for cluster states
Spokeperson(s)	Valdir , Guimaraes
Data Manager(s)	Valdir , Guimaraes
GANIL Scientific Coordinator
Collection Dates (dd-mm-yy)	Start: 31-03-2024 End: 04-04-2024
End of Embargo	04-04-2027
DOI	https://doi.org/10.26143/ganil-2024-e837_21
DOI State	findable
Publication Year	2024
Publisher	GANIL, Large Heavy Ion National Accelerator, Caen, France
Data Curator	GANIL, Large Heavy Ion National Accelerator, Caen, France
Hosting Institution	(CC-IN2P3) IN2P3’s Computing Centre, Villeurbanne, France
Size	66.57 TB

Experiment details

Abstract

This experiment investigates the cluster structure of 12Be via resonant elastic scattering of an 8He beam on a 4He active target, using the ACTAR TPC detector at GANIL, complemented by a silicon wall detector placed at the downstream end of the active volume. The resonances populated in 12Be in the excitation energy range 11.6–13 MeV are expected to decay predominantly through the 4He+8He channel (ground state). This energy region lies near several cluster decay thresholds: the 4He+8He(g.s.) threshold at 8.96 MeV, the 6He+6He(g.s) threshold at 10.1 MeV, and the 5He+7He threshold at 12.23 MeV. The detector was filled with a gas mixture of 4He (97%) and C4H10 (3%) acting as a quencher, at pressures of 700 and 900 mbar. The beam energy was set to 1.774 MeV/u. The excitation energy resolution achieved is around 80 keV. Three triggers are available: a beam counter (CFA, cylindrical proportional low-pressure gaseous detector positioned upstream of the active volume, 1/1000 downscale), a silicon wall trigger validated by the CFA, and a pad plane trigger active outside the beam veto region. The measurement of excitation energy spectra and angular distributions aims to constrain the spin and parity of the resonances, and to shed light on the alpha-cluster structure and molecular states in 12Be near these thresholds.

Setup

Beam(s)

Target(s)

Studied reaction(s)

Contributors

Given Name	Family Name	Id.	Affiliation(s)
Valérian	Girard-Alcindor		GANIL, Large Heavy Ion National Accelerator, Caen, France
Igor	Celikovic		(VINS) Vinča Institute of Nuclear Sciences, Vinča, Serbia
Beatriz	Fernández-Domínguez		(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
Chloé	Fougères		CEA DAM
Juan	Lois Fuentes		(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
Jaromir	Mrazek		(NPI-CAS) Czech Academy of Sciences, Nuclear Physics Institute, Řež, Czechia
Florin	Rotaru		(IFIN-HH) Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, Măgurele, Romania
Thomas	Roger		GANIL, Large Heavy Ion National Accelerator, Caen, France
Abhilasha	Singh		GANIL, Large Heavy Ion National Accelerator, Caen, France
Mihai	Stanoiu		(IFIN-HH) Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, Măgurele, Romania
Ángel Miguel	Sánchez Benítez		(UHU) University of Huelva, Huelva, Spain
Jean-Charles	Thomas		GANIL, Large Heavy Ion National Accelerator, Caen, France
Juan Carlos	Zamora Cardona		(USP) University of São Paulo, São Paulo, Brazil
Lou	Dienis		GANIL, Large Heavy Ion National Accelerator, Caen, France
Xesus	Pereira Lopez		(IBS) Institute for Basic Science, Daejeon, South Korea
Tamara	Milanovic		(VINS) Vinča Institute of Nuclear Sciences, Vinča, Serbia
Marius	Le Joubioux		GANIL, Large Heavy Ion National Accelerator, Caen, France
Predrag	Ujic		(VINS) Vinča Institute of Nuclear Sciences, Vinča, Serbia
Bertrand	Jacquot		GANIL, Large Heavy Ion National Accelerator, Caen, France
Rojeeta Devi	Kshetrimayum		GANIL, Large Heavy Ion National Accelerator, Caen, France
Charly	Nicolle		GANIL, Large Heavy Ion National Accelerator, Caen, France
Djillali	Allal		GANIL, Large Heavy Ion National Accelerator, Caen, France
Francois	de oliveira Santos		GANIL, Large Heavy Ion National Accelerator, Caen, France
Miguel	Lozano Gonzalez		(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
Maria Grazia	Pellegriti		INFN Catania Division, Catania, Italy
Marine	Vandebrouck		(IRFU) Institut de Recherche sur les Lois Fondamentales de l'Univers, Gif-sur-Yvette, France (CEA) Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Paris, France University of Paris-Saclay, Gif-sur-Yvette, France
Beatriz	Errandonea		CEA, Saclay, France (USC) University of Santiago de Compostela, Santiago de Compostela, Spain
Navin	Alahari		GANIL, Large Heavy Ion National Accelerator, Caen, France
Jérôme	Giovinazzo		(LP2IB) Laboratoire de Physique des deux infinis Bordeaux, Gradignan, France
Aurora	Ortega-Moral		(LP2IB) Laboratoire de Physique des deux infinis Bordeaux, Gradignan, France
Maria	Fisichella		GANIL, Large Heavy Ion National Accelerator, Caen, France
Julien	Pancin		GANIL, Large Heavy Ion National Accelerator, Caen, France

Institutes

Name	Id.
(USP) University of São Paulo, São Paulo, Brazil
GANIL, Large Heavy Ion National Accelerator, Caen, France
(USC) University of Santiago de Compostela, Santiago de Compostela, Spain
(IFIN-HH) Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, Măgurele, Romania
(NPI-CAS) Czech Academy of Sciences, Nuclear Physics Institute, Řež, Czechia
(VINS) Vinča Institute of Nuclear Sciences, Vinča, Serbia
(UHU) University of Huelva, Huelva, Spain
(IBS) Institute for Basic Science, Daejeon, South Korea
INFN Catania Division, Catania, Italy
(IRFU) Institut de Recherche sur les Lois Fondamentales de l'Univers, Gif-sur-Yvette, France
University of Paris-Saclay, Gif-sur-Yvette, France
(LP2IB) Laboratoire de Physique des deux infinis Bordeaux, Gradignan, France
(CEA DAM) Direction des Applications Militaires, Bruyères-le-Châtel, France