C. Pastor

Charged particles identification with a CsI(Tl) scintillator

Abstract A CsI(Tl) scintillator with two light decay components is used to detect and identify p, d, t, 3 He and α particles with a low energy threshold. Besides, the addition of a thin plastic scintillator in front of the CsI(Tl) crystal allows charge identification for ions with Z up to 19.

Investigation of the performance of CsI(Tl) for charged particle identification by pulse-shape analysis

We have studied the possibility of particle discrimination by pulse-shape analysis in CsI(Tl) scintillator. In order to investigate the limitations of that process we have analysed the time response of the scintillator for different ions at various energies. It is found that for energies lower than 200 MeV the identification is limited to charges Z < 4. This work also gives an understanding of these limitations.

Using the combination Csl(TI) and photodiode for identification and energy measurement of light particles

Abstract The two gated method is used with a CsI(Tl)+photodiode combination for the identification and the energy measurement of light particles.

Detection of charged particles with a phoswich counter

Abstract The essential features, construction details and performance of a phoswich detector are described. Results about the Z and mass identification, energy calibration and total energy response for protons, deuterons, tritons and alphas in the energy range from 20 up to 80 MeV are presented.

The phostron: A phoswich counter for neutron and charged particle detection

Abstract A phoswich detector able to detect and identify gammas, neutrons and charged particles (p, d, t, α) of 10–100 MeV is described. It consists of a CaF 2 (Eu) scintillator optically coupled with a NE213 liquid scintillator.

Etude des états excités de15O d'énergie comprise entre 10 et 10.5 MeV

SummaryProton elastic scattering on14N is studied in the regionEp=(3÷3.55) MeV. Four resonances are observed atEp=3209, 3215, 3410 and 3440 keV with widths of Λ=(3±1), (11±2), (25±5), (140±40) keV andJπ values of (5/2)−, 5/2+, (3/2)− and (3/2)+ corresponding to excited states in15O atEx=10286, 10292, 10474 and 10 502 keV, respectively.RiassuntoSi studia lo scattering elastico dei protoni su14N nella regioneEp=(3÷3.55) MeV. Si osservano quattro risonanze adEp=3209, 3215, 3410 e 3440 keV con ampiezze Λ=(3±1), (11±2), (25±5), (140±40) keV e valori diJπ di (5/2)−, 5/2+, (3/2)− e (3/2)+ corrispondenti a stati eccitati nel15O adEx=10 286, 10 292, 10 474 e 10 502 keV, rispettivamente.РезюмеИсследуется упругое рассеяние протонов на14N в областиEp=(3÷3.55) МэВ. Наблюдаются четяре резонансаEp=3209, 3215, 3410 и 3440 кэВ с ширинами Λ=(3±1), (11±2), (25±5), (140±40) кэВ иJπ величинами (5/2)−, 5/2+, (3/2)− и (3/2)+, которые соответствуют возбужденным состояниям в15O соответственно приEx=10 286, 10 292, 10 474 и 10 502 кэВ.

Module de decision logique programme

Abstract A decision unit has been built to simplify the electronic logic set-up in multi-detector experiments. This unit, designed with fast memories used as decision making tables, replaces conventional logic modules. Nine inputs are provided for receiving the fast detector signals (charged particles, gammas, neutrons, etc.). Fifteen independent outputs allow the identification of the chosen events among the 2 9 possible events. A CAMAC interface between the unit and the computer, or a manual control auxiliary module, is used to load, in the memory, the pattern of the chosen events.

Etude des réactions 20 Ne(t, p) 22 Ne et 21 Ne(t, d) 22 Ne à E t =3 et 3.4 mev

SummaryAbsolute differential cross-sections were measured for proton groups from the20Ne(t, p)22Ne reaction at 3 and 3.4 MeV and for two deuteron groups from the21Ne(t, d)22Ne reaction at 3 MeV with a gas cell containing20Ne or21Ne. The total cross-sections of most groups were analysed in terms of Hauser-Feshbach theory and several final-state spin predictions are made. The angular distribution of the20Ne(t, p)22Ne (Ex=6.24 MeV) reaction was analysed by double-stripping DWBA theory and indicates 0+ for this state, the isobaric analogue of which has been identified at 6.83 MeV in22Na.RiassuntoSi sono misurate le sezioni d’urto differenziali assolute per i gruppi di protoni ottenuti dalla reazione20Ne(p, p)22Ne a, 3 e 3.4 MeV e per due gruppi di deuteroni ottenuti dalla reazione21Ne(t, d)22Ne a 3 MeV con una cella a gas contenente20Ne o21Ne. Si sono analizzate le sezioni d’urto totali per la maggior parte dei gruppi in base alla teoria di Hauser-Feshbach e si sono fatte numerose previsioni sullo spin degli stati finali. Si è analizzata la distribuzione angolare della reazione20Ne(t, p)22Ne (Ex=6.24 MeV) con la teoria DWBA di doppio stripping; essa dà O+ per questo stato, di cui si è identificato l’analogo isobarico nel22Na a 6.83 MeV.РезюмеБьли измерены абсолютные дифференциальные поперечные сечения для груии протонов из реакции20Ne(t, p)22Ne при 3 и 3.4 МэВ и для двух групп дейтронов из реакции21Ne(t, p)22Ne при 3 МэВ, используя газонаполненный элемент, содержащий20Ne или21Ne. Полные поперечные сечения для большинства групп анализируются на основе теории Хаузера-Фешбаха и делаются предсказания для спинов некоторых конечных состояний. Угловое раслределение ракции20Ne(t, p)22Ne (Et=6.24 МэВ) анализируется с помощью теории DWBA двойного стриппинга и предсказывается 0+ для этого состояния, изобарический аналог которого был идентифицирован при 6.83 МэВ в22Na.

Etude des réactions20Ne(t, p)22Ne et21Ne(t, d)22Ne àEt=3 et 3.4 mev

SummaryAbsolute differential cross-sections were measured for proton groups from the20Ne(t, p)22Ne reaction at 3 and 3.4 MeV and for two deuteron groups from the21Ne(t, d)22Ne reaction at 3 MeV with a gas cell containing20Ne or21Ne. The total cross-sections of most groups were analysed in terms of Hauser-Feshbach theory and several final-state spin predictions are made. The angular distribution of the20Ne(t, p)22Ne (Ex=6.24 MeV) reaction was analysed by double-stripping DWBA theory and indicates 0+ for this state, the isobaric analogue of which has been identified at 6.83 MeV in22Na.RiassuntoSi sono misurate le sezioni d’urto differenziali assolute per i gruppi di protoni ottenuti dalla reazione20Ne(p, p)22Ne a, 3 e 3.4 MeV e per due gruppi di deuteroni ottenuti dalla reazione21Ne(t, d)22Ne a 3 MeV con una cella a gas contenente20Ne o21Ne. Si sono analizzate le sezioni d’urto totali per la maggior parte dei gruppi in base alla teoria di Hauser-Feshbach e si sono fatte numerose previsioni sullo spin degli stati finali. Si è analizzata la distribuzione angolare della reazione20Ne(t, p)22Ne (Ex=6.24 MeV) con la teoria DWBA di doppio stripping; essa dà O+ per questo stato, di cui si è identificato l’analogo isobarico nel22Na a 6.83 MeV.РезюмеБьли измерены абсолютные дифференциальные поперечные сечения для груии протонов из реакции20Ne(t, p)22Ne при 3 и 3.4 МэВ и для двух групп дейтронов из реакции21Ne(t, p)22Ne при 3 МэВ, используя газонаполненный элемент, содержащий20Ne или21Ne. Полные поперечные сечения для большинства групп анализируются на основе теории Хаузера-Фешбаха и делаются предсказания для спинов некоторых конечных состояний. Угловое раслределение ракции20Ne(t, p)22Ne (Et=6.24 МэВ) анализируется с помощью теории DWBA двойного стриппинга и предсказывается 0+ для этого состояния, изобарический аналог которого был идентифицирован при 6.83 МэВ в22Na.

8. 92 MeV doublet and 8. 98 MeV level in /sup 15/O

The analysis of excitation curves and angular correlations of the ..gamma.. rays from the /sup 14/N(p,..gamma..)/sup 15/O reaction confirms the existence of a doublet at 8.92 MeV in /sup 15/O. J/sup ..pi../ = 5/2/sup +/ and J/sup ..pi../ = 1/2/sup -/ assignments are determined for the spins and parities of the two members of this doublet. The 8.98 MeV level is found to have J/sup ..pi../ = 3/2/sup -/. This study was performed using a differentially pumped gas target of natural nitrogen. A comparison with /sup 15/N levels and with theoretical results is discussed.