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Neutrino Fluence after r‐Process Freezeout and Abundances of Te Isotopes in Presolar Diamonds

Qian, Y.-Z. and Vogel, P. and Wasserburg, G. J. (1999) Neutrino Fluence after r‐Process Freezeout and Abundances of Te Isotopes in Presolar Diamonds. Astrophysical Journal, 513 (2). pp. 956-960. ISSN 0004-637X. doi:10.1086/306896.

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Using the data of Richter, Ott, & Begemann on Te isotopes in diamond grains from a meteorite, we derive bounds on the neutrino fluence and the decay timescale of the neutrino flux relevant for the supernova r-process. Our new bound on the neutrino fluence ℱ after freezeout of the r-process peak at mass number A~130 is more stringent than the previous bound ℱ≾0.045 (in units of 10^(37) ergs cm^(-2)) of Qian et al. and Haxton et al., if the neutrino flux decays on a timescale hat τ≾0.65 s. In particular, it requires that a fluence of ℱ=0.031 be provided by a neutrino flux with hat τ≾0.84 s. Such a fluence may be responsible for the production of the solar r-process abundances at A=124-126. Our results are based on the assumption of Ott that only the stable nuclei implanted into the diamonds are retained, while the radioactive nuclei are lost from the diamonds upon decay after implantation. We consider that the nanodiamonds are condensed in an environment with C/O>1 in the expanding supernova debris or from the exterior H envelope. This environment need not have the ^(13)C/^(12)C ratio of the bulk diamonds, since the Te- and Xe-containing nanodiamond grains are too rare to affect that ratio. The implantation of nuclei would have occurred ~10^4-10^6 s after r-process freezeout. This time interval may be marginally sufficient to permit adequate cooling upon expansion for the formation of diamond grains. The mechanisms of preferential retention/loss of the implanted nuclei are not well understood.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Vogel, P.0000-0003-0587-5466
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1999 American Astronomical Society. Received 1998 August 24; accepted 1998 October 19. We want to thank the referee, Ulrich Ott, for helpful comments. This work was supported in part by the U. S. Department of Energy grant DE-FG03-88ER-40397, by NASA grant NAG 5-4076, and by Division Contribution 8524(1005). Y.-Z. Q. was supported by the David W. Morrisroe Fellowship at Caltech.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-88ER-40397
Caltech David W. Morrisroe FellowshipUNSPECIFIED
Subject Keywords:elementary particles; nuclear reactions, nucleosynthesis, abundances; solar system: formation; supernovae: general
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences8524
Lunatic Asylum Lab1005
Issue or Number:2
Record Number:CaltechAUTHORS:20131120-083121245
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Official Citation: Neutrino Fluence after r-Process Freezeout and Abundances of Te Isotopes in Presolar Diamonds Y.-Z. Qian et al. 1999 ApJ 513 956
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42583
Deposited By: Ruth Sustaita
Deposited On:20 Nov 2013 20:16
Last Modified:10 Nov 2021 16:25

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