The effect of host medium on the half-life of 7Be

Ray, A.; Das, P.; Saha, S.; Das, Samaresh

doi:10.1016/s0370-2693(02)01501-0

Cited by 31 publications

(18 citation statements)

References 8 publications

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confidence: 99%

“…The half-life of 7 Be endohedral C 60 ( 7 Be@C 60 ) and 7 Be in Be metal (Be metal ( 7 Be)) is found to be 52:68 0:05 and 53:12 0:05 days, respectively. This amounts to a 0:83% difference in electroncapture decay half-life between 7 Be@C 60 and Be metal ( 7 Be). Our result is a reflection of the different electron wave functions for 7 Be@C 60 inside C 60 compared to the situation when 7 Be is in a Be metal.…”

mentioning

confidence: 99%

“…This amounts to a 0:83% difference in electroncapture decay half-life between 7 Be@C 60 and Be metal ( 7 Be). Our result is a reflection of the different electron wave functions for 7 Be@C 60 inside C 60 compared to the situation when 7 Be is in a Be metal. DOI There is a longstanding interest in how nuclear decay rates, in particular -decay rates, can be changed artificially because it leads to information about the electron wave functions of the medium surrounding the decaying nucleus and because of the (somewhat remote) possibility of changing the decay rates of radioactive waste products.…”

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Enhanced Electron-Capture Decay Rate ofB7eEncapsulated inC60

et al. 2004

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The decay rate of 7Be electron capture was measured in C60 and Be metal with a reference method. The half-life of 7Be endohedral C60 ((7)Be@C(60)) and 7Be in Be metal (Be metal (7Be)) is found to be 52.68+/-0.05 and 53.12+/-0.05 days, respectively. This amounts to a 0.83% difference in electron-capture decay half-life between (7)Be@C(60) and Be metal (7Be). Our result is a reflection of the different electron wave functions for (7)Be@C(60) inside C60 compared to the situation when 7Be is in a Be metal.

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Enhanced Electron-Capture Decay Rate ofB7eEncapsulated inC60

et al. 2004

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“…Recently, the life-time modification has been suggested to stem from differences of the Coulomb screening potential [23] between conductors and insulators. Several experimental and theoretical investigations were conducted during recent years to study the host material effect on the decay rate of ^Be [22,[24][25][26][27][28], with a somewhat confusing scattering of experimental results. It was found that the half-life of ^Be encapsulated in a fullerene Ceo cage and ^Be in Be metal is 52.68(5) and 53.12 (5) days, respectively, amounting to a difference of 0.83(13)% [27].…”

Section: Host and Temperature Dependence Of The ^Be Half Lifementioning

confidence: 99%

[sup 7]Be in Stars and in the Laboratory

Hass¹,

Kumar²

2008

AIP Conference Proceedings

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We discuss results and future plans for low-energy reactions that play an important role in current nuclear astrophysics research and that happen to concentrate around the region of ^ = 7. The ^Be(p, 7)^6 and the ^HeCHe, yJ^Be reactions are crucial for understanding the solar-neutrino oscillations phenomenon and the latter one plays a central role in the issue of cosmic ^Li abundance and Big-Bang Nucleosynthesis. The electron-capture (EC) decay rate of ^Be in metallic Cu host and the j3^-decay rate of ^'^Au in the host alloy Al-Au have been measured simultaneously at several temperatures, ranging from 0.350 K to 293 K. The resulting null temperature dependence is discussed in terms of the inadequacy of the often-used Debye-Hi/ckel model for such measurements. Keywords: Cross sections of solar fusion reactions; Neutrino oscillations; Big-bang nucleosynthesis; Host and temperature dependence of the EC half-life. PACS: 25.40.Lw, 26.35.+C, 26.65.+t, 27.20.+n SOLAR FUSION REACTIONS, SOLAR NEUTRINOS AND BIG-BANG NUCLEOSYNTHESIS The Cross Section of the ^Be(P, yfB ReactionOur planet is bombarded every second with a large number of charge-less, mass-less neutrinos, originating in the nuclear fusion reactions that power the energy production in the Sun. A major, long-lasting research effort, focusing on the apparent shortfall of detected solar neutrinos as compared to theoretical predictions, culminated recently with the results of the Sudbury Neutrino Observatory (SNO) experiment [1], affirming the notion of neutrino oscillations (and hence neutrino mass). The SNO experiment, as well as the preceding Homestake [2] and Super-Kamiokande [3] experiments are sensitive only to a small fraction of the solar neutrino spectrum, to the high-energy neutrinos that are emitted as a result of the fusion of protons with the nucleus ^Be and the subsequent beta decay of the ^B product nucleus. The cross section of this reaction has been measured in the laboratory several times. However, mostly due to difficulties with the preparation and homogeneity of the radioactive ^Be target, large discrepancies still persist in the extracted cross section values. The present experiment uses in a novel way a 2 mm diameter target of the ^Be radioactive nuclei (with a half-life of 53 days), prepared by direct implantation at the ISOLDE (CERN) laboratory and brought to the Van de Graaff accelerator of the Weizmann Institute, Israel, for the measurement of the reaction. The results of these experiments have been published in detail in several previous papers [4][5][6][7][8]. Fig. 1 presents a brief summary of the results.With the present determination of the p+^Be cross section at solar energies to an accuracy of better than 4%, this important nuclear physics quantity ceases to be the largest source of error in the Standard Solar Model [9] estimates of the ^B neutrino flux.

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“…5) In experiments to determine the decay rate of 7 Be compounds, different chemical forms and/or host materials have been investigated by several groups. [6][7][8][9][10][11][12] Differences found in the decay rate of 7 Be as a function of different chemical forms, host materials and under high pressure have until now been limited almost to within 0.2%. In recent studies, however, large variations have been observed as a function of different chemical forms and pressures.…”

Section: Introductionmentioning

confidence: 99%

Lifetime Measurement of <SUP>7</SUP>Be in Beryllium Metal Crystal

Ohtsuki

Ohno

Morisato³

et al. 2007

Mater. Trans.

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The decay rate of an electron-capture nucleus is proportional to the electron density in the nucleus. In order to see how the decay rate can be changed artificially, we have measured the half-life of 7 Be in a beryllium (Be) metal crystal. We found that it is 53:25 AE 0:04 days, which is slightly longer than that in hosts such as graphite, lithium fluoride, and others that have previously been tested.

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The effect of host medium on the half-life of 7Be

Cited by 31 publications

References 8 publications

Enhanced Electron-Capture Decay Rate ofB7eEncapsulated inC60

Enhanced Electron-Capture Decay Rate ofB7eEncapsulated inC60

[sup 7]Be in Stars and in the Laboratory

Lifetime Measurement of <SUP>7</SUP>Be in Beryllium Metal Crystal

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