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Structure of54Mn from the54Cr(p, nγ)54Mn and51V(α, nγ)54Mn reactions

Структура54Mn из реакций54Cr(p, nγ)54Mn и54V(α, nγ)54Mn

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Il Nuovo Cimento A (1965-1970)

Summary

The properties of excited states of54Mn formed in the54Cr(p, nγ)54Mn reaction at 3.0 to 4.3 MeV incident-proton energy and in the51V(α, nγ)54Mn reaction at 7 to 15 MeV incident α-energy have been studied by means of γ-ray spectroscopy. From measurements of yield functions and angular distributions spin assignments of 6 and 5 are proposed for the 1073 and 1173 keV states. New high-spin states are found at 1784 keV (7+), 1925 keV (7), 2856 keV (8), 3237 keV (8, 9) and 3244 keV (9+). The new high-spin states are interpreted as spherical positive-parity states predicted by shell theory based on configurations outside the48Ca core coexisting with states resulting from a breaking of the48Ca neutron core. The positions of the states considered as belonging to the former group agree well with theoretical predictions. The states considered to be associated with the breaking of the neutron core follow theJ(J+1)-rule.

Riassunto

Per mezzo della spettroscopia a raggi γ si sono studiate le proprietà di stati eccitati del54Mn formati nella reazione54Cr(p, nγ)54Mn ad energia dei protoni incidenti di (3.0÷4.3) MeV e nella reazione51V(α, nγ)54Mn ad energie delle particelle α incidenti di (7÷15) MeV. A seguito di misure delle funzioni risultanti a delle distribuzioni angolari si sono propositi dei valori 6 e 5 dello spin per gli stati di 1073 e 1173 keV. Si sono trovati nuovi stati a spin elevato a 1784 keV (7+), 1925 keV (7), 2856 keV) (8), 3237 keV (8, 9) e 3244 keV (9+). Si sono interpretati i nuovi stati con spin elevato come stati sferici a parità positiva previsti dalla teoria e strati sulla base di configurazioni esterne al nocciolo48Ca coesistenti con stati risultanti dalla rottura del nocciolo di neutroni del48Ca. Le posizioni degli stati considerati come appartenenti al primo gruppo concordano bene con le previsioni teoriche. Gli stati considerati come associati alla rottura del nocciolo di neutroni seguono la regolaJ(J+1).

Резюме

С помощью γ-лучевой спектроскопии исслеуются свойства возбужденных состояний54Mn, образованных в реакции54Cr(p, nγ)54Mn при энергии падающего протона от 3.0 до 4.3 МэВ и в реакции51V(α, nγ)54Mn при энергии падающего протона от 3.0 до 4.3 МэВ и в реакции51V(α, nγ)54Mn при энергии падающей α-частицы от 7 до 15 МэВ. Из проведенных измерений функций выхода и угловых распределений для состояний 1073 и 1173 кэВ устанавливаются значения спинов 6 и 5. Новые состояния с высшими спинами обнаружены при 1784 кэВ (7+), 1925 кэВ (7), 2856 кэВ (8), 3237 кэВ (8, 9) и 3244 кэВ (9+). Новые состояния с высшими спинами интерпретируются, как сферические состояния с положительной четностью, которые предсказаны оболочечной теорией, основанной на конфнгурациях вне остова48Ca, которые сосуществуют с состояниями, образованными при нарушении нейтронного остова48Ca. Положения рассмотренных состояний, принадлежащих первой группе, согласуются с теоретическими предсказаниями. Рассмотренные состояния, которые связаны с нарушением нейтронного остова, следуют правилуJ(J+1).

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Authors and Affiliations

  1. Chalmers University of Technology, Göteborg

    N. G. Alenius, S. E. Arnell, E. Selin & O. Stankiewicz

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  1. N. G. Alenius
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  2. S. E. Arnell
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  3. E. Selin
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  4. O. Stankiewicz
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Additional information

A preliminary account of this work has been given in AFI Annual Report 1973 and Annual Report 1973, Tandem Accelerator Laboratory, Uppsala.

Traduzione a cura della Redazione.

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Alenius, N.G., Arnell, S.E., Selin, E. et al. Structure of54Mn from the54Cr(p, nγ)54Mn and51V(α, nγ)54Mn reactions. Nuov Cim A 27, 249–276 (1975). https://doi.org/10.1007/BF02785345

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