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Marion, Jerry B.; Levin, J. S.

doi:10.1103/physrev.115.144

Cited by 39 publications

(5 citation statements)

References 13 publications

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“…5 and 6. The 9 Be( p, pЈ) 9 Be*(n) reaction with 9 Be* at an excitation level of 2.43 MeV could be the main contributor according to the analysis of Marion et al 6 In this analysis it was estimated that if the 2.43-MeV level decays by emitting a neutron to the ground state of 8 Be, the decay-in-flight would give these neutrons a mean energy of about 1 MeV, although they did not observe a neutron peak around 1 MeV in their measurements.…”

Section: Resultsmentioning

confidence: 99%

Study of boron neutron capture therapy used neutron source with protons bombarding a thick 9Be target

1997

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Neutron sources created by 4-, 3.5-, and 3-MeV protons striking a thick beryllium target were studied via the time-of-flight technique. Protons were accelerated by the Peking University 4.5 MV electrostatic accelerator. Two disk-shaped 9Be targets with thickness 1.5 and 3 mm were used in the measurements. The time-of-flight spectra were observed at zero degrees with respect to the incident proton beam. The analysis to these time-of-flight spectra is given. The time-of-flight spectra were converted to the energy spectra and compared to a neutron spectrum of 7Li(p, n)7 Be reaction with incident energy 2.5 MeV, which was also measured in this work. Restricted by the spectrometer itself, the threshold of the measurements is 400 keV. The results show that by using several MeV protons bombarding a thick beryllium target, reactions other than 9Be(p, n)9B produce significant contributions to the neutron yield with energy less than 1 MeV.

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Section: Resultsmentioning

confidence: 99%

Study of boron neutron capture therapy used neutron source with protons bombarding a thick 9Be target

1997

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“…Ex > 9,11 MeV, confirmant les previsions ant6rieures deduites de 1'etude des reactions 9Be (p, n) et 9Be (p, ay) [13,14]. Cette structure r6sonnante semble d'ailleurs persister a plus haute énergie (Ep > 4 MeV) ou Yasue et al [15] étudiant la diffusion elastique 9Be (p, p)'Be font 6tat de 1'existence d'un doublet a Ep = 4,5 MeV, (r1 = 200 keV, F2 = 1000 keV) et d'un niveau a Ep = 4,7 MeV (r = 300 keV, J1t = 2+).…”

Section: Ces Resultats Laissent Supposer Des 6tats Du Lob àunclassified

“…Marion [14]. De plus ce r6sultat est en accord avec les conclusions d'une part de Ajzenberg et al [32] qui mettent en evidence un niveau du lOB a EX = 10,8 MeV, de largeur r = 300 ± 100 keV a partir de 1'analyse des spectres des produits de la reaction 11 B(3He, a) 1 °B, (Fig.…”

Section: Ces Resultats Laissent Supposer Des 6tats Du Lob àunclassified

Niveaux du 10B excités dans la diffusion élastique 9Be + p à 2 ≤ Ep ≤ 5 MeV

1983

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2014 Les sections efficaces différentielles absolues de la diffusion 9Be + p ont été mesurées à 2 ~ Ep 3,8 MeV. Cinq courbes d'excitation à des angles 65° ~ 03B8cm ~ 160° et cinq distributions angulaires à Ep = 2,31; 2,44; 2,56; 2,62 et 2,73 MeV et pour des angles 40° ~ 03B8cm ~ 140° ont été obtenues. L'analyse simultanée de ces résultats et de données existant à Ep ~ 5 MeV a été effectuée dans le formalisme de la matrice R. L'ensemble des données a été ajusté de façon satisfaisante en tenant compte, dans cette gamme d'énergie, de neuf niveaux du 10B situés respectivement aux énergies d'excitation

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“…5 MeV protons create an intense high energy component since both ground and first excited state transitions of 9 B contribute to the 9 Be(p,n) 9 B reaction channel: the nominal threshold for excitation of the first excited state of 9 B is 4.64 MeV. In addition to the reaction channels already cited, the neutron production increase around 500 keV should be instead ascribed to the 2.56 MeV reaction resonance, affecting protons slowed down within the target [13].…”

Section: Resultsmentioning

confidence: 92%