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Decrock, P.; Duhamel, P.; Galster, W.; Huýse, M.; Licot, I.; Liénard, E.; Michotte, C.; Duppen, P. Van; Vanhorenbeeck, J.; Delbar, Thierry; Leleux, Pierre; Lipnik, P.; Loiselet, M.; Ryckewaert, G.; Vervier, J.

doi:10.1103/physrevlett.67.808

Cited by 126 publications

(65 citation statements)

References 11 publications

(33 reference statements)

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“…The radioactive beam loses energy traversing the target: the initial beam energy and target thickness are chosen in order to cover the centre-of-mass energies of interest. The method, widely applied in Louvain-la-Neuve and other RIB facilities [2,25,26,27,28], has been extended to study the ground and excited states of unbound nuclei, either directly or through their isobaric analogue states: for example 11 N [29] and 19 Na [30,31] in Louvain-la-Neuve, 7 He [32] at the TwinSol Facility of the Notre Dame University. In addition, using α particles as a target, the same method was applied to the investigation of the cluster structure of resonances in selected nuclei (section 4.2).…”

Section: Methodsmentioning

confidence: 99%

“…2. The first result and also the first capture measurement with a radioactive ion beam was the direct determination of the 13 N(p,γ) 14 O reaction cross section which is crucial to determine the stellar conditions under which the hot CNO cycle competes with the cold CNO cycle [2,12]. In the relevant range of stellar temperatures the cross-section is dominated by the p = 0 resonance at E c.m.…”

Section: First Measurementsmentioning

confidence: 99%

“…On June 22, 1989, after two years of developments, a first beam was post-accelerated: a million 13 N ions per second were accelerated to an energy of 8 MeV [1]. In December 1990, a first experiment was carried out: in 33 hours of beam time the cross section of the proton-capture reaction on 13 N was measured using a 3 × 10 8 particles per s (pps), pure (∼99 %) 8.2 MeV 13 N beam [2]. Since then various beams of radioactive isotopes ranging from 6 He (T 1/2 = 0.8 s) to 35 Ar (T 1/2 = 1.7 s), with intensities from 1 × 10 5 pps ( 35 Ar) up to 2 × 10 9 pps ( 19 Ne), were developed and many experiments in nuclear astrophysics and nuclear structure were performed.…”

Section: Introductionmentioning

confidence: 99%

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Radioactive ion beam physics at the cyclotron research centre Louvain-la-Neuve

Huyse¹,

Raabe²

2011

J. Phys. G: Nucl. Part. Phys.

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Abstract.The first beam of post-accelerated radioactive ions was realized in 1989 at the Louvainla-Neuve research facility. The method employed two coupled cyclotrons to produce, separate and re-accelerate the species of interest. Several technological challenges were solved in the process, to obtain pure and intense beams for use in nuclear physics research. Similarly, new techniques were developed and refined for the measurement of the nuclear reactions induced by the radioactive beams. The available energy range made the facility particularly suited for nuclear astrophysics studies, and important results were obtained in the determination of stellar reaction rates using beams of 7 Be, 13 N, 18 F, 18,19 Ne. A beam of 6 He ions was extensively used in studies of the nuclear structure (halos, molecular states) and dynamics (the reaction process at energies around the potential barrier).

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Section: Methodsmentioning

confidence: 99%

Section: First Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radioactive ion beam physics at the cyclotron research centre Louvain-la-Neuve

Huyse¹,

Raabe²

2011

J. Phys. G: Nucl. Part. Phys.

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“…This method was successfully applied for the first time in 1989 at the laboratory of Louvain la Neuve (Belgium). The first experiment used 13 N beams to study the astrophysical reaction 13 N(p,γ) 14 O relevant to the hot CNO cycle, one of the explosive hydrogen-burning processes [5]. It should be noted that the same reaction was studied at RIKEN with fragmentation-based RI beams almost at the same time by a completely different method, Coulomb dissociation [6].…”

Section: Development Of Ri Beamsmentioning

confidence: 99%

World new facilities for radioactive isotope beams

Motobayashi

2014

EPJ Web of Conferences

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Abstract. The use of unstable nuclei in the form of energetic beams for nuclear physics studies is now entering into a new era. "New-generation" facilities are either in operation, under construction or being planned. They are designed to provide radioactive isotope (RI) beams with very high intensities over a wide range of nuclides. These facilities are expected to provide opportunities to study nuclear structure, astrophysical nuclear processes and nuclear matter with large proton-neutron imbalance in grate detail. This article reports on the current status of such new-generation RI-beam facilities around the world. RI beams in nuclear physics studies Extension of our knowledge in the nuclear chartRadioactive isotopes (RI), or unstable nuclei, play a crucial role in enhancing our knowledge on atomic nuclei. The discovery of new methods for artificial RI production has advanced nuclear physics research substantially. A total of around 500 isotopes were known in 1940, including almost 300 stable ones. The number of known nuclides has increased in a linear manner since then, with some variations due to social constraints or technical innovations [1]. The nuclear chart, shown in Fig. 1, exhibits the present status of our knowledge. About 3,000 isotopes including 2,700 radioactive ones have been identified so far. According to theoretical predictions by, for example, the KTUY theory [2], another 7,000 isotopes might exist if fissioning nuclei with lifetimes longer than 1 µs are counted as well as β emitters [3]. The effort to extend our knowledge on the nuclear chart is an ongoing process: construction of new facilities and development of new experimental methods should support such activities. Development of RI beamsIn the mid 80s, the idea of using unstable nuclei in the form of energetic beams was realized for the first time at LBL [4]. The projectile-fragmentation reaction with fast ion-beams was the mechanism to produce RI's in-flight. The first application of these RI beams was to measure interaction cross sections of light unstable nuclei. The enhancement of matter radius owing to neutron halos was observed for some light, neutron-rich nuclei. This success triggered the construction of new facilities that could provide RI beams with high intensities using the same production method. In the 90's, dedicated a

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“…The resulting 1 3 N beam was incident on a (CH2)n polyethy lene target, and the capture y-rays result ing from the 1 3 N(p,y)140 reaction were observed by Ge detectors. Using this meth od, the cross section for the latter reaction was measured in the energy range of the first resonance at 0.586 MeV, which corre sponds to the first excited level of l40 at 5.152 MeV [7]. Complementary experi ments on this reaction, dealing with 1 3 N(p,p)1 3 N elastic scattering and the 13N(d,n)140 reaction, were also carried out [8].…”

Section: Direct and Indirect Cross Section Measurementsmentioning

confidence: 99%

Nuclear Astrophysics with Radioactive Beams

Vervier¹

1997

Europhysics news

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Radioactive beams, either at low or high energy, can be very useful for understanding violent events which are encountered in nuclear astrophysics.The main aim of the field of nuclear astrophysics is to understand the produc tion of energy and the synthesis of ele ments in stars and during stellar events. Both processes occur through nuclear reactions [1]. In "quiet" stars like our sun, and in general during non-violent stellar events, the rate of these nuclear reactions is much smaller than the average decay rate of the radioactive nuclei which are often produced by the reactions. In conse quence, these radioactive nuclei have ample time to decay before becoming involved in other nuclear reactions, so that mostly reactions between stable nuclei are important.It is believed that, during "violent" stellar events, examples of which will be given below, the opposite situation pre vails, i.e. the average time between succesFig· 1 . Schematic model of a novae phenomenon. Matter ejected from a (large) red giant is attracted by a (small) white dwarf, and splashes onto Its surface. sive nuclear reactions is much shorter than the average decay time of the radio active nuclei. These nuclei do not have time to decay before participating in new nuclear reactions, so that reactions in which at least one of the two partners is radioactive (the other one often being a proton or an a α-particle) then become very important. It is thus essential, in order to fully understand these violent events, to know the decay properties of the radioactive nuclei produced (half-lives, decay modes etc.) and the cross sections for nuclear reactions in which they are involved. In the present article, we will show that radioactive beams are very use ful for the determination of these decay properties and nuclear reaction cross sec tions.

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Determination of theN13(p,γ)14

Cited by 126 publications

References 11 publications

Radioactive ion beam physics at the cyclotron research centre Louvain-la-Neuve

Radioactive ion beam physics at the cyclotron research centre Louvain-la-Neuve

World new facilities for radioactive isotope beams

Nuclear Astrophysics with Radioactive Beams

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