Nuclear shell model calculations of neutralino-nucleus cross sections for germanium and silicon

Conference · Fri Jan 01 00:00:00 EST 1993 · American Astronomical Society, Bulletin; (United States)

OSTI ID:5705541

Ressell, M T; Aufderheide, M B; Bloom, S D; Mathews, G J; Resler, D A ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

The authors present the results of detailed nuclear shell model calculations of the spin-dependent elastic cross section for neutralinos scattering from [sup 29]Si and [sup 73]Ge. The calculations were performed in large model spaces which adequately describe the configuration mixing in these two nuclei. As tests of the computed nuclear wave functions, the authors have calculated several nuclear observables and compared then with the measured values and found good agreement. In the limit of zero momentum transfer, they find scattering matrix elements in agreement with previous estimates for [sup 29]Si but significantly different than previous work for [sup 73]Ge. A modest quenching, in accord with shell model studies of other heavy nuclei, has been included to bring agreement between the measured and calculated values of the magnetic moment for [sup 73]Ge. Even with this quenching, the calculated scattering rate is roughly a factor of 2 higher than the best previous estimates, which implies a larger sensitivity for germanium dark matter detectors, without quenching the rate is a factor of 4 larger. The authors also investigate the role of finite momentum transfer upon the scattering response for both nuclei and find that this can significantly change the expected rates. They close with a brief discussion of the effects of some of the non-nuclear uncertainties upon the matrix elements.

• OSTI ID: 5705541
• Report Number(s): CONF-9310189-; CODEN: AASBAR; TRN: 94-001106
• Journal Information: American Astronomical Society, Bulletin; (United States), Vol. 25:3; Conference: 25. annual meeting of the Division for Planetary Sciences of the American Astronomical Society, Boulder, CO (United States), 18-22 Oct 1993; ISSN 0002-7537
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELEMENTARY PARTICLES
SCATTERING
GERMANIUM 73
CONFIGURATION MIXING
SHELL MODELS
CROSS SECTIONS
SILICON 29
ASTROPHYSICS
MAGNETIC MOMENTS
MATRIX ELEMENTS
MOMENTUM TRANSFER
NONLUMINOUS MATTER
RADIATION DETECTORS
SPIN
WAVE FUNCTIONS
ANGULAR MOMENTUM
EVEN-ODD NUCLEI
FUNCTIONS
GERMANIUM ISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATTER
MEASURING INSTRUMENTS
MILLISEC LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON ISOTOPES
STABLE ISOTOPES
663400* - Specific Nuclear Reactions & Scattering- (1992-)