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Languages : en
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A study was made of the radiations of the protactinium isotopes Pa/sup 227/, Pa/sup 228/, Pa/sup 225/, Pa/sup 230/, Pa/sup 232/, Pa/sup 233/ as well as Ac/sup 223/, and Ac/sup 224/, with primary emphasis placed on the investigation of the aipha-decay spectra with highresolution alpha-particle spectrographs. Decay schemes are presented in each case, and are interpreted where ever possible in terms of current theoretical nuclear models. The collective model of Bohr and Mottelson finds wide application in most csses, although the complexity of the decay schemes leaves certain features unexplained. (auth).
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Languages : en
Pages :
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Book Description
A study was made of the radiations of the protactinium isotopes Pa/sup 227/, Pa/sup 228/, Pa/sup 225/, Pa/sup 230/, Pa/sup 232/, Pa/sup 233/ as well as Ac/sup 223/, and Ac/sup 224/, with primary emphasis placed on the investigation of the aipha-decay spectra with highresolution alpha-particle spectrographs. Decay schemes are presented in each case, and are interpreted where ever possible in terms of current theoretical nuclear models. The collective model of Bohr and Mottelson finds wide application in most csses, although the complexity of the decay schemes leaves certain features unexplained. (auth).
Author: Max Wilmer Hill
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ISBN:
Category : Delayed neutrons
Languages : en
Pages : 112
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Languages : en
Pages :
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The alpha decay of Pa/sup 231/, Pa/sup 229/, Pa/sup 227/, and Ac/sup 223/ w as studied by an alpha-particle --gamma-ray coincidence technique. A 180 deg double-focusing spectrograph or goldsilicon solid-state detectors for alpha analysis and a sodium iodide (Tl-activated) scintillation crystals for gamma-ray detection were used. The ground states of Pa/sup 227/ and Pa/sup 229/ are shown to be populated by 5.46- and 5.73-Mev alpha particles, respectively. The rotational bands populated in the decay of Pa/sup 231/ are interpreted as being based on octupole vibrational levels predicted by the Bohr -Mottelson strong- coupling model. Modified decay schemes are presented. It is suggested that in odd-proton nuclei, the permanent nuclear deformation starts closer to the closed shell than in the even-even nuclei. A new alpha group at 5.47 Mev is noted in the alpha decay of Ac/sup 233/. No rotational structure is observed in the levels populated. Evidence is presented for the presence of two additional levels populated in the alpha decay of Pa/sup 231/. 40 references. (auth).
Author: Vishnu B. Subrahmanyam
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ISBN:
Category : Alpha decay
Languages : en
Pages : 80
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Author: W. Wayne Meinke
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Category : Protactinium
Languages : en
Pages : 8
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 670
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Author: Ong Ping Hok
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Category : Beta rays
Languages : en
Pages : 114
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1058
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Author: University of California (1868-1952)
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Category : Universities and colleges
Languages : en
Pages : 1708
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Category :
Languages : de
Pages : 27
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