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Dive into the research topics where I. Penev is active.

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Featured researches published by I. Penev.


Zeitschrift f�r Physik A Atoms and Nuclei | 1984

A retarded intramultipletM1 transition in214Bi

I. Penev; W. Andrejtscheff; Ch. Protochristow; Zh. Zhelev

The half-life of the 53.2 keV level in214Bi has been measured asT1/2=0.52±0.15 ns, furtherT1/2(295.2 keV and 351.9 keV levels)≦0.10 ns was estimated. TheB(M1,2−→1−) transition rates within theπh9/2vg9/2 multiplet in210,212,214Bi are found to decrease rapidly with increasing neutron number, reaching in214Bi a value as low as those typical for intraband M1 transitions in deformed odd-odd nuclei.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1987

On the timing properties of germanium detectors: The centroid diagrams of prompt photopeaks and compton events

I. Penev; W. Andrejtscheff; Ch. Protochristov; Zh. Zhelev

Abstract In the applications of the generalized centroid shift method with germanium detectors, the energy dependence of the time centroids of prompt photopeaks (zero-time line) and of Compton background events reveal a peculiar behavior crossing each other at about 100 keV. The effect is plausibly explained as associated with the ratio of γ-quanta causing the photoeffect and Compton scattering, respectively, at the boundaries of the detector.


Czechoslovak Journal of Physics | 1986

Structure of the145Sm states from the145Eu Decay

J. D. Adam; J. Dobeš; J. Fér; B. Kracik; A. Kugler; Zh. Zhelev; I. Penev; Ch. Stoyanov

The γ-radiation from145Eu has been studied by means of an anti-Compton spectrometer, the construction and operation of which are described. Altogether 91 γ-transitions have been observed, 20 of them for the first time. A decay scheme of145Eu has been constructed incorporating 85 γ-transitions. Low-lying excited states in145Sm have been analysed within the quasiparticle-phonon nuclear model as well as within the interacting boson-fermion model. Some systematic features in the positions of low-lying positive parity levels inN=83 nuclei have been revealed.


Naučna konferencija Uniteh 2010 | 2010

Quantitative Element Anaysis of Samples from Mine Region near Buhovo, Bulgaria

N. Arhangelova; E. Nikolova; K. Berovski; D. Dikov; L.K. Kostov; R. Kostov; M. Mladenov; H. Protohristov; N. Uzunov; S. Ushev; V. Velev; H. Hristov; S. Todorov; Ch. Stoyanov; I. Penev


Czechoslovak Journal of Physics | 1986

Structure of the 145 Sm states from the 145 Eu Decay

J. D. Adam; J. Dobeš; J. Fér; B. Kracik; Alfred A. Kugler; Zh. Zhelev; I. Penev; Ch. Stoyanov


European Physical Journal A | 1984

A retarded intramultiplet M 1 transition in 214 Bi

I. Penev; W. Andrejtscheff; Ch. Protochristow; Zh. Zhelev


Yadern. Fiz. 16: No. 5, 881-889(1972). | 1972

Study of the

B. Amov; T. B. Vandlik; Ya. Vandlik; Ts. Vylov; Zh. Zhelev; N.G. Zaitseva; I. Penev; Kh. Tyrroff


Archive | 1972

sup 194

B. G. Amov; T. B. Vandlik; Ya. Vandlik; Ts. Vylov; Zh. Zhelev; N.G. Zaitseva; I. Penev; H. Tyrroff


Archive | 1971

Tl decay.

B. G. Amov; Ts. Vylov; M. Enikova; Zh. Zhelev; N. A. Lebedev; I. Penev; V. I. Fominykh; E. Herrmann


Archive | 1971

Study of the ¹⁹⁴Tl decay.

B. Amov; Ts. Vylov; M. Enikova; Zh. Zhelev; N. A. Lebedev; I. Penev; V.I. Fominykh; E. Herrmann

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W. Andrejtscheff

Bulgarian Academy of Sciences

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Zh. Zhelev

Bulgarian Academy of Sciences

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J. D. Adam

Czechoslovak Academy of Sciences

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J. Dobeš

Academy of Sciences of the Czech Republic

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B. Kracik

Bulgarian Academy of Sciences

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Ch. Protochristow

Bulgarian Academy of Sciences

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E. Herrmann

Joint Institute for Nuclear Research

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N. A. Lebedev

Joint Institute for Nuclear Research

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Ch. Protochristov

Bulgarian Academy of Sciences

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L.K. Kostov

Bulgarian Academy of Sciences

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