Periodes de quelques radionucleides

Lagoutine, F.; Legrand, Judith; Bac, C.

doi:10.1016/0020-708x(75)90151-9

Cited by 46 publications

(10 citation statements)

References 22 publications

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“…In Table I and figure 2 the 7 Be decay half-lives for all the measured samples are shown in comparison to literature values. The 7 Be half-lives for gold, graphite and platinum matrices determined in this work are in good agreement with the values reported in literature [11,8,13,14]. Our result for (11) -a Ref.…”

Section: Resultssupporting

confidence: 92%

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Mazzocchi¹,

Janas²,

Bączyk³

et al. 2012

Acta Phys. Pol. B

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Section: Resultssupporting

confidence: 92%

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Mazzocchi¹,

Janas²,

Bączyk³

et al. 2012

Acta Phys. Pol. B

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“…External factors such as chemical forms and pressure may alter the electron density at the nucleus and thus affect the EC decay rate. In recent studies, there have been several observations or calculations concerning the change in half-life according to the host materials, [14][15][16][17][18] chemical forms, [19][20][21][22] and pressure. 23,24 Although, in most of these environments, the half-life is longer than 53.10 days, Ohtsuki et al found that the half-life of 7 Be@C 60 is 52.65Ϯ 0.04 days at room temperature ͑RT͒ ͑293 K͒ and moreover 52.47Ϯ 0.04 days at liquid-helium temperature ͑5 K͒.…”

Section: Introductionmentioning

confidence: 99%

Electron-capture decay rate ofB7e@C60by first-principles calculations based on density functional theory

Morisato¹,

Ohno

Ohtsuki

et al. 2008

Phys. Rev. B

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Carrying out a first-principles calculation assuming linear relationship between the electron density at Be nucleus and the electron-capture ͑EC͒ decay rate, we explained why 7 Be@C 60 shows higher EC decay rate than 7 Be crystal, which was originally found experimentally by Ohtsuki et al. ͓Phys. Rev. Lett. 93, 112501 ͑2004͔͒. From the results of the calculation, we found that there are inequivalent four stable ͑i.e., lower energy͒ Be sites inside C 60 and that center of C 60 ͑C_C 60 ͒ is the most favorable site. For C _ C 60 , the electron density at the Be nucleus is the highest. It is also much higher than that at the Be nucleus in a Be crystal. Also, we estimated the expected electron density at the Be nucleus at room temperature by taking statistical average of the electron densities at the four Be nucleus sites using the Boltzmann distribution. The results of the calculation show fairly good agreement with the experimental results. In this paper, we focus on the detail of calculation, which was not fully demonstrated in the paper by Ohtsuki.

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“…The change of decay rate of 7 Be in different beryllium compounds was measured [8] and a maximum change of up to 0.2% was observed. However, relatively large changes [9][10][11][12][13] in the decay rate of 7 Be were observed recently for 7 Be nuclei implanted in different media. All these results can be qualititatively understood in terms of the electron affinities of neighboring host atoms.…”

Section: Introductionmentioning

confidence: 99%

TerrestrialBe7decay rate andB8solar neutrino flux

Das

Ray

2005

Phys. Rev. C

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The decay rate of 7 Be has always been measured by either forming a beryllium compound or implanting 7 Be in a medium. We can quantitatively understand the measured changes of 7 Be decay rates in different environments as well as its L/K orbital electron capture ratio using tight-binding linear muffin-tin orbital method calculations. We find that 7 Be loses a very substantial fraction of its 2s electrons in a medium. As a result of this loss of 2s electrons, the extracted nuclear matrix element of the 7 Be electron capture reaction from terrestrial decay rate measurements should increase by 2-2.7%, thus decreasing the calculated 8 B solar neutrino flux from the Standard Solar Model by 2-2.7%.

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Periodes de quelques radionucleides

Cited by 46 publications

References 22 publications

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Electron-capture decay rate ofB7e@C60by first-principles calculations based on density functional theory

TerrestrialBe7decay rate andB8solar neutrino flux

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