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K-shell internal ionization and excitation in beta-decay: Theoretical study

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Il Nuovo Cimento A (1965-1970)

Summary

The total probability of aK-shake-off process in β-decay has been reformulated by correcting the theory by Law and Campbell. By means of the improved formulation and by adding simple corrections for theK-shake-up contribution and for the correlation effect betweenK electron and other bound electrons, the totalK hole creation probability per β-decay has been evaluated for 24 interesting nuclides. There exist distinct disagreements between our calculated values and recent experimental data; the measured probabilities are systematically larger than our calculated ones for medium- and high-Z nuclides. This clearly indicates that the theory ofK shake-off, as here corrected, is not sufficient to explain the recent experimental data. This is contrary to the conclusion recently presented by many other workers that theK-shake-off plus shake-up process is the predominant mechanism ofK-shell internal ionization and excitation in β-decay. It will be necessary to introduce the β-particleelectron correlation in future theoretical treatments.

Riassunto

Si è riformulata la probabilità totale del processo di shake-offK nel decadimento β correggendo la teoria di Law e Campbell. Per nezzo della formulazione migliorata e aggiungendo semplici correzioni per il contributo dello shake-upK e per l’effetto di correlazione tra gli elettroni dello stratoK e altri elettroni legati, si è valuatata la probabilità totale di creazione di una bucaK per decadimento β per 24 nuclidi interessanti. Esistono netti disaccordi tra i nostri valori calcolati e recenti dati sperimentali; le probabilità misurate sono sistematicamente più grandi di quelle calcolate da noi per i nuclidi conZ medio e alto. Ciò indica chiaramente che la teoria dello shake-offK, come corretta in questo contesto, non è sufficiente per spiegare i recenti dati sperimentali. Questo fatto è contrario alle conclusioni presentate recentemente da molti altri autori che il processo di shake-offK più shake-upK è il meccanismo predominante della ionizzazione interna dello stratoK e dell’eccitazione nel decadimento β. Sarà necessario introdurre in future trattazioni teoriche la correlazione tra particella β ed elettrone.

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Authors and Affiliations

  1. Institute for Chemical Research and Radioisotope Research Center, Kyoto University, Kyoto

    Y. Isozumi, S. Shimizu & T. Mukoyama

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  1. Y. Isozumi
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Isozumi, Y., Shimizu, S. & Mukoyama, T. K-shell internal ionization and excitation in beta-decay: Theoretical study. Nuov Cim A 41, 359–376 (1977). https://doi.org/10.1007/BF02730113

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