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Publications (10 of 43) Show all publications
Alcayne, V., Cano-Ott, D., Garcia, J., Gonzalez-Romero, E., Martinez, T., Mendoza, E., . . . Zugec, P. (2023). A segmented total energy detector (sTED) for (n, gamma) cross section measurements at n_TOF EAR2. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 01043.
Open this publication in new window or tab >>A segmented total energy detector (sTED) for (n, gamma) cross section measurements at n_TOF EAR2
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2023 (English)In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 01043Conference paper, Published paper (Refereed)
Abstract [en]

The neutron time-of-flight facility n_TOF is characterised by its high instantaneous neutron intensity, high resolution and broad neutron energy spectra, specially conceived for neutron-induced reaction cross section measurements. Two Time-Of-Flight (TOR) experimental areas are available at the facility: experimental area 1 (EAR1), located at the end of the 185 m horizontal flight path from the spallation target, and experimental area 2 (EAR2), placed at 20 m from the target in the vertical direction. The neutron fluence in EAR2 is similar to 300 times more intense than in EARL in the relevant time-of-flight window. EAR2 was designed to carry out challenging cross-section measurements with low mass samples (approximately 1 mg), reactions with small cross-sections or/and highly radioactive samples. The high instantaneous fluence of EAR2 results in high counting rates that challenge the existing capture systems. Therefore, the sTED detector has been designed to mitigate these effects. In 2021, a dedicated campaign was done validating the performance of the detector up to at least 300 keV neutron energy. After this campaign, the detector has been used to perform various capture cross section measurements at n_TOF EAR2.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-511620 (URN)10.1051/epjconf/202328401043 (DOI)001006475600043 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Funder
EU, Horizon 2020, 847552
Available from: 2023-09-13 Created: 2023-09-13 Last updated: 2023-09-13Bibliographically approved
Domingo-Pardo, C., Babiano-Suarez, V., Balibrea-Correa, J., Caballero, L., Ladarescu, I., Lerendegui-Marco, J., . . . Zugec, P. (2023). Advances and new ideas for neutron-capture astrophysics experiments at CERN n_TOF. European Physical Journal A, 59(1), Article ID 8.
Open this publication in new window or tab >>Advances and new ideas for neutron-capture astrophysics experiments at CERN n_TOF
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2023 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 59, no 1, article id 8Article in journal (Refereed) Published
Abstract [en]

This article presents a few selected developments and future ideas related to the measurement of (n,γ) data of astrophysical interest at CERN n_TOF. The MC-aided analysis methodology for the use of low-efficiency radiation detectors in time-of-flight neutron-capture measurements is discussed, with particular emphasis on the systematic accuracy. Several recent instrumental advances are also presented, such as the development of total-energy detectors with γ-ray imaging capability for background suppression, and the development of an array of small-volume organic scintillators aimed at exploiting the high instantaneous neutron-flux of EAR2. Finally, astrophysics prospects related to the intermediate i neutron-capture process of nucleosynthesis are discussed in the context of the new NEAR activation area.

Place, publisher, year, edition, pages
Springer, 2023
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-498449 (URN)10.1140/epja/s10050-022-00876-7 (DOI)000926364900001 ()
Funder
EU, Horizon 2020, 681740EU, Horizon 2020, 847552
Available from: 2023-03-16 Created: 2023-03-16 Last updated: 2023-03-16Bibliographically approved
Pavon-Rodriguez, J. A., Alcayne, V., Amaducci, S., Bacak, M., Casanovas, A., Cortes-Giraldo, M. A., . . . Zugec, P. (2023). Characterisation of the n_TOF 20 m beam line at CERN with the new spallation target. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 06006.
Open this publication in new window or tab >>Characterisation of the n_TOF 20 m beam line at CERN with the new spallation target
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2023 (English)In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 06006Conference paper, Published paper (Refereed)
Abstract [en]

The n_TOF facility hosts CERN's pulsed neutron source, comprising two beam lines of different flight paths and one activation station. It is based on a proton beam delivered by the PS accelerator impinging on a lead spallation target. During Long Shutdown 2 (LS2) at CERN (2019-2021), a major upgrade of the spallation target was carried out in order to optimize the performances of the neutron beam. Therefore, the characteristics of n_TOF two experimental areas were investigated in detail. In this work, the focus is on the second experimental area (EAR2), located 20 m above the spallation target. Preliminary results of the neutron energy distribution and beam line energy resolution are presented, compared to previous experimental campaigns and Monte Carlo simulations with the FLUKA code. Moreover, preliminary results of the spatial beam profile measurements are shown.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-511706 (URN)10.1051/epjconf/202328406006 (DOI)001006475600108 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Available from: 2023-09-14 Created: 2023-09-14 Last updated: 2023-09-14Bibliographically approved
Domingo-Pardo, C., Babiano-Suarez, V., Balibrea-Correa, J., Caballero, L., Ladarescul, I., Lerendegui-Marco, J., . . . Zugec, P. (2023). Compton imaging for enhanced sensitivity (n,gamma) cross section TOF experiments: Status and prospects. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 01018.
Open this publication in new window or tab >>Compton imaging for enhanced sensitivity (n,gamma) cross section TOF experiments: Status and prospects
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2023 (English)In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 01018Conference paper, Published paper (Refereed)
Abstract [en]

Radiative neutron-capture cross sections are of pivotal importance in many fields such as nucle-osynthesis studies or innovative reactor technologies. A large number of isotopes have been measured with high accuracy, but there are still a large number of relevant isotopes whose cross sections could not be experimentally determined yet, at least with sufficient accuracy and completeness, owing to limitations in detection techniques, sample production methods or in the facilities themselves. In the context of the HYMNS (High-sensitivitY Measurements of key stellar Nucleo-Synthesis reactions) project over the last six years we have developed a novel detection technique aimed at background suppression in radiative neutron-capture time-of-flight measurements. This new technique utilizes a complex detection set-up based on position-sensitive radiation-detectors deployed in a Compton-camera array configuration. The latter enables to implement gamma-ray imaging techniques, which help to disentangle true capture events arising from the sample under study and contaminant background events from the surroundings. A summary on the main developments is given in this contribution together with an update on recent experiments at CERN n_TOF and an outlook on future steps.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-511704 (URN)10.1051/epjconf/202328401018 (DOI)001006475600018 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Funder
EU, European Research Council, 681740
Available from: 2023-09-14 Created: 2023-09-14 Last updated: 2023-09-14Bibliographically approved
Gomez L, A. M., Al-Adili, A., Göök, A., Pomp, S., Pousette, A., Solders, A., . . . Oberstedt, S. (2023). Determination of the Plasma Delay Time in PIPS detectors for fission fragments at the LOHENGRIN spectrometer. In: 15th International Conference on Nuclear Data for Science and Technology (ND2022): . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND2022). EDP Sciences, 284, Article ID 04012.
Open this publication in new window or tab >>Determination of the Plasma Delay Time in PIPS detectors for fission fragments at the LOHENGRIN spectrometer
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2023 (English)In: 15th International Conference on Nuclear Data for Science and Technology (ND2022), EDP Sciences, 2023, Vol. 284, article id 04012Conference paper, Published paper (Refereed)
Abstract [en]

The VElocity foR Direct particle Identification spectrometer (VERDI) is a 2E-2v fission spectrometer that allows the measurement of the total mass distribution of secondary fission fragments with a resolving power of 1-2 u. It consists of two time-of-flight (ToF) arms, with one Micro Channel Plate (MCP) detector and up to 32 Silicon PIPS (Passive Implanted Planar Silicon) detectors per arm. The MCPs provide the start timing signals and the PIPS detectors provide both the energy and the stopping ToF signals. In real conditions, the PIPS signals are affected by the formation of plasma from the interaction between the heavy ions and the detector material. The plasma contributes to a reduction in signal amplitude, resulting in a Pulse Height Defect (PHD), and introduces a signal delay, known as Plasma Delay Time (PDT). An experiment to characterize the PDT and PHD was performed at the LOHENGRIN recoil separator of the Institut Laue Langevin (ILL). Characteristic fission fragments from the 239Pu(n,f) reaction were separated based on their A/Q and E/Q ratios, allowing the measurement of a wide range of energies from 21 to 110 MeV and masses between 80 and 149 u. Six PIPS detectors were characterized to study their individual responses to the PDT and PHD effects. The signals were recorded in a digital acquisition system to completely exploit the offline analysis capabilities. Achieved combined timing and energy resolutions for fission fragments varied between 72(2) ps and 100(4) ps and 1.4% - 2% (FWHM), respectively. Preliminary PHD and PDT data are presented from the masses A=85, 95, 130 and 143. The PHD trends are strongly correlated with both the ion energy and mass. The PDT, on the other hand, shows a strong variation as a function of the ion kinetic energy but a smaller dependence on the ion mass.

Place, publisher, year, edition, pages
EDP Sciences, 2023
National Category
Subatomic Physics
Research subject
Physics with specialization in Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-510673 (URN)10.1051/epjconf/202328404012 (DOI)001006475600089 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND2022)
Available from: 2023-09-02 Created: 2023-09-02 Last updated: 2023-09-14Bibliographically approved
Garcia-Infantes, F., Praena, J., Casanovas, A., Mastromarco, M., Aberle, O., Alcayne, V., . . . Zugec, P. (2023). First high resolution measurement of neutron capture resonances in Yb-176 at the n_TOF CERN facility.. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 09001.
Open this publication in new window or tab >>First high resolution measurement of neutron capture resonances in Yb-176 at the n_TOF CERN facility.
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2023 (English)In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 09001Conference paper, Published paper (Refereed)
Abstract [en]

Several international agencies recommend the study of new routes and new facilities for producing radioisotopes with application to nuclear medicine. Lu-177 is a versatile radioisotope used for therapy and diagnosis (theranostics) of cancer with good success in neuroendocrine tumours that is being studied to be applied to a wider range of tumours. Lu-177 is produced in few nuclear reactors mainly by the neutron capture on Lu-176. However, it could be produced at high -intensity accelerator-based neutron facilities. The energy of the neutrons in accelerator-based neutron facilities is higher than in thermal reactors. Thus, experimental data on the Yb-176(n,(sic)) cross-section in the eV and keV region are mandatory to calculate accurately the production of Yb-177, which beta decays to 177Lu. At present, there are not experimental data available from thermal to 3 keV of the Yb-176(n,(sic)) cross-section. In addition, there is no data in the resolved resonance region (RRR). This contribution shows the first results of the Yb-176 capture measurement performed at the n_TOF facility at CERN.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-511618 (URN)10.1051/epjconf/202328409001 (DOI)001006475600130 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Available from: 2023-09-14 Created: 2023-09-14 Last updated: 2023-09-14Bibliographically approved
Balibrea-Correa, J., Babiano-Suarez, V., Lerendegui-Marco, J., Domingo-Pardo, C., Ladarescu, I., Tarifeno-Saldivia, A., . . . Zugec, P. (2023). First measurement of the 94Nb(n,γ) cross section at the CERN n_TOF facility. Paper presented at 10th Conference on Nuclear Physics in Astrophysics (NPA), SEP 05-09, 2022, Geneva, SWITZERLAND. EPJ Web of Conferences, 279, Article ID 06004.
Open this publication in new window or tab >>First measurement of the 94Nb(n,γ) cross section at the CERN n_TOF facility
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2023 (English)In: EPJ Web of Conferences, E-ISSN 2100-014X, Vol. 279, article id 06004Article in journal (Refereed) Published
Abstract [en]

One of the crucial ingredients for the improvement of stellar models is the accurate knowledge of neutron capture cross-sections for the different isotopes involved in the s-,r- and i- processes. These measurements can shed light on existing discrepancies between observed and predicted isotopic abundances and help to constrain the physical conditions where these reactions take place along different stages of stellar evolution.

In the particular case of the radioactive 94Nb, the 94Nb(n,γ) cross-section could play a role in the determination of the s-process production of 94Mo in AGB stars, which presently cannot be reproduced by state-of-the-art stellar models. There are no previous 94Nb(n,γ) experimental data for the resolved and unresolved resonance regions mainly due to the difficulties in producing highquality samples and also due to limitations in conventional detection systems commonly used in time-of-flight experiments.

Motivated by this situation, a first measurement of the 94Nb(n,γ) reaction was carried out at CERN n_TOF, thereby exploiting the high luminosity of the EAR2 area in combination with a new detection system of small-volume C6D6-detectors and a high quality 94Nb-sample. The latter was based on hyper-pure 93Nb material activated at the high-flux reactor of ILL-Grenoble. An innovative ring-configuration detection system in close geometry around the capture sample allowed us to significantly enhance the signal-to-background ratio. This set-up was supplemented with two conventional C6D6-detectors and a highresolution LaCl3(Ce)-detector, which will be employed for addressing reliably systematic effects and uncertainties.

At the current status of the data analysis, 18 resonance in 94Nb+n have been observed for the first time in the neutron energy range from thermal up to 10 keV.

Place, publisher, year, edition, pages
EDP Sciences, 2023
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-505499 (URN)10.1051/epjconf/202327906004 (DOI)000995956500015 ()
Conference
10th Conference on Nuclear Physics in Astrophysics (NPA), SEP 05-09, 2022, Geneva, SWITZERLAND
Funder
EU, Horizon 2020, 681740European Commission
Note

Title in Web of Science: First measurement of the Nb-94(n,gamma) cross section at the CERN n_TOF facility

Available from: 2023-06-20 Created: 2023-06-20 Last updated: 2023-07-06Bibliographically approved
Mastromarco, M., Manna, A., Garcia-Infantes, F., Amaducci, S., Mengoni, A., Massimi, C., . . . Zugec, P. (2023). Measurement of the Gd-160(n, gamma) cross section at n_TOF and its medical implications. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 09002.
Open this publication in new window or tab >>Measurement of the Gd-160(n, gamma) cross section at n_TOF and its medical implications
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2023 (English)In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 09002Conference paper, Published paper (Refereed)
Abstract [en]

Neutron-capture reactions on gadolinium isotopes play an important role in several fields of physics, in particular in nuclear Astrophysics for the understanding of the nucleosynthesis of heavy elements (beyond iron) in stars via the s- and r-processes [1] and in nuclear technology. Another important application of gadolinium is linked to the production of terbium, that offers a set of clinically interesting isotopes for theranostics, characterized by complementary physical decay characteristics. In particular, the low -energy beta(-) emitter terbium-161 is very similar to lutetium-177 in terms of half-life (6.89 d), beta(-) - energy and chemical properties. Being a significant emitter of conversion/Auger electrons, greater therapeutic effect can therefore be expected in comparison to Lu-177 [2, 3]. For this reason, in the last decade, the study of the neutron capture reaction Gd-160(n,,gamma)(161) Gd and the subsequent beta(-) - decay in terbium-161 is getting particular attention. As the nuclear data on the Gd-160 neutron capture reaction are quite scarce and inconsistent, a new measurement of the capture cross section of Gd-160 at the CERN neutron Time -Of-Flight facilty was performed in order to provide high resolution, high -accuracy data on this important reaction, in the energy range from thermal to hundreds of keV. In this contribution, the preliminary results of the n_TOF measurement are presented.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-511619 (URN)10.1051/epjconf/202328409002 (DOI)001006475600131 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Available from: 2023-09-13 Created: 2023-09-13 Last updated: 2023-09-13Bibliographically approved
Mucciola, R., Paradela, C., Manna, A., Alaerts, G., Massimi, C., Kopecky, S., . . . Zugec, P. (2023). Neutron capture and total cross-section measurements on Mo-94'95'96 at n_TOF and GELINA. In: Mattoon, CM Vogt, R Escher, J Thompson, I (Ed.), 15th International Conference on Nuclear Data for Science and Technology, ND2022: . Paper presented at 15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK. EDP Sciences, 284, Article ID 01031.
Open this publication in new window or tab >>Neutron capture and total cross-section measurements on Mo-94'95'96 at n_TOF and GELINA
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2023 (English)In: 15th International Conference on Nuclear Data for Science and Technology, ND2022 / [ed] Mattoon, CM Vogt, R Escher, J Thompson, I, EDP Sciences, 2023, Vol. 284, article id 01031Conference paper, Published paper (Refereed)
Abstract [en]

Capture and total cross section measurements for 94'95'96 MO have been performed at the neutron time -of-flight facilities, n_TOF at CERN and GELINA at JRC-Geel. The measurements were performed using isotopically enriched samples with an enrichment above 95% for each of the (94'95'96)M0 isotopes. The capture measurements were performed at n_TOF using C6D6 detectors and a new sTED detector. The transmission measurements were performed at a 10 m station of GELINA using a Li-6 glass neutron detector. Preliminary results of these measurements are presented.

Place, publisher, year, edition, pages
EDP Sciences, 2023
Series
EPJ Web of Conferences, ISSN 2100-014X
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-511617 (URN)10.1051/epjconf/202328401031 (DOI)001006475600031 ()
Conference
15th International Conference on Nuclear Data for Science and Technology (ND), JUL 21-29, 2022, ELECTR NETWORK
Available from: 2023-09-14 Created: 2023-09-14 Last updated: 2023-09-14Bibliographically approved
Massimi, C., Aberle, O., Alcayne, V., Altieri, S., Amaducci, S., Andrzejewski, J., . . . Zugec, P. (2023). Neutron-induced cross section measurements. Paper presented at 10th Conference on Nuclear Physics in Astrophysics (NPA), SEP 05-09, 2022, Geneva, SWITZERLAND. EPJ Web of Conferences, 279, Article ID 11009.
Open this publication in new window or tab >>Neutron-induced cross section measurements
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2023 (English)In: EPJ Web of Conferences, E-ISSN 2100-014X, Vol. 279, article id 11009Article in journal (Refereed) Published
Abstract [en]

Neutron-induced cross sections represent the main nuclear input to models of stellar and Big-Bang nucleosynthesis. While (n,γ) reactions are relevant for the formation of elements heavier than iron, (n,p) and (n,α) reactions can play an important role in specific cases. The time-of-flight method is routinely used at n_TOF to experimentally determine the cross section data. In addition, recent upgrades of the facility will allow the use of activation techniques as well, possibly opening the way to a systematic study of neutron interaction with radioactive isotopes. In the last 20 years n_TOF has provided a large amount of experimental data for Nuclear Astrophysics. Our plan is to carry on challenging measurements and produce nuclear data in the next decades as well.

Place, publisher, year, edition, pages
EDP Sciences, 2023
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-505502 (URN)10.1051/epjconf/202327911009 (DOI)000995956500040 ()
Conference
10th Conference on Nuclear Physics in Astrophysics (NPA), SEP 05-09, 2022, Geneva, SWITZERLAND
Available from: 2023-06-20 Created: 2023-06-20 Last updated: 2023-07-06Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9858-3341

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