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Project List » Romania's participation at CERN - n_TOF Collaboration

Romania's participation at CERN - n_TOF Collaboration
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Acronym: n_TOF
Contracting Authority: Institutul de Fizica Atomica (IFA)
Number / Date of the contract: CERN01 / 2022-03-01
PN3/5.2/ CERN-RO
Project Manager: Alexandru Negret
Starting date / finishing date: 2022-01-03 / 2024-09-30
Project value: 1405000 RON
Abstract: The present project continues the efforts of the IFIN-HH research team to actively contribute through its expertise in the field of nuclear instrumentation and reaction cross sections measurements, to the increase of the diversity of the topics addressed and to the improvement of the accuracy of the nuclear data provided by the n_TOF collaboration. Together with the other 150 members of the collaboration, through the experiments carried out at the facility, we aim to acquire a better understanding of the nuclear reaction mechanisms and, at the same time, to aid the typical applications of basic nuclear physics research (next generation nuclear reactors, medicine, environmental protection, etc.). In doing this, we transfer back to society these scientific advancements leading to technical progress and ultimately to an increased quality of life. n_TOF is the main neutron source of CERN, consisting of a lead target bombarded by 10-GeV protons. For performing experiments, the n_TOF users have at their disposal three experimental areas with complementary properties of the neutron flux. On account of its long flight path (185 m), the first experimental area (EAR1) is used especially for experiments that require a good incident energy resolution. In contrast, thinner targets - made of rare or even instable radioisotopes - are studied in the experimental area 2 (EAR2), which is characterized by a flux 40 times higher, as a result of its shorter flight path (20 m). The third experimental area is located in the vicinity of the neutron-producing target and it is used to study the properties of various materials in intense neutron fields. The activities foreseen in the current project follow up the two directions that now can be considered representative for our research group: first - the technical developments needed for carrying out measurements of neutron inelastic reactions cross section and second, continuing the neutron capture program with a new experimental proposal. Up to now, in order to achieve the first objective, we have focused our efforts exclusively on adapting the HPGe detectors to the specific conditions found at n_TOF. Within the new project we also plan to investigate the response of other detection systems that could be used in experiments that require high efficiency in detecting high energy ? rays. Similar to the study performed for HPGe detectors, the response of these detectors to a high flux of fast neutrons will be verified by performing GEANT4 simulations. The results of the simulations will be validated by tests with radioactive sources or at other facilities that can deliver fast neutron beams. The study of HPGe detectors will continue with a new test in 2022, this time with dedicated beam time. The test will start by checking the level of the background radiation, then the neutron-induced inelastic reaction on the 7Li and 56Fe samples will be measured. These experiments should show the feasibility of measuring inelastic scattering cross sections at n_TOF using HPGe detectors. The second direction of research it will continue by preparing and proposing a new experiment.

Objectives: Objective I. Nuclear instrumentation developments
I.1. HPGe development
Milestone 1.1. (31.12.2022) Preparing the in-beam test.
Milestone 2.1. (30.06.2023) Performing the in-beam test. Preliminary analysis.
Result 2.1. (31.12.2023) HPGe advanced signal processing.
I.2. Other detector types for studying neutron inelastic reactions.
Milestone 2.4 (31.12.2023) New types of detectors for high energy γ-rays.
Milestone 3.1 (30.09.2024) Testing the detector response to neutrons/ γ-flash.
Objective II. Preparing and writing a new experimental proposal
Milestone 2.3 (31.12.2023) Gaining the knowhow for data analysis.
Milestone 2.5 (31.12.2023) Research on the new experimental case. Discussions with the collaboration.
Result 3.2 (30.09.2024) Writing the experimental proposal.



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