Primordial nucleosynthesis during the keV era
Energetic hadronic and electromagnetic showers in the keV era of the hot big bang are produced by the decays of long lived particles. These showers initiate a new phase of nucleosynthesis. The abundance ratios of D, /sup 3/He, /sup 6/Li and /sup 7/Li are given by fixed points of rate equations, which are determined by nuclear physics not by the nature of the decaying particle. The fixed points are independent of prior abundances, so that constraints from the MeV era of nucleosynthesis evaporate, except for a requirement that /sup 4/He not be underproduced. For example, ..cap omega../sub B/ = 1 and many more than four neutrino species are both possible. Within the accuracy of our calculation (there are uncertainties of at least a factor of three), the abundances agree with those inferred from observations. Considerable /sup 6/Li is produced and must be depleted in both population II halo stars and in the galactic disk. We predict /sup 6/Li, /sup 3/He and D abundances in primordial material which are higher than conventional nucleosynthesis. 8 refs.
- Research Organization:
- Stanford Univ., CA (USA); Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5925607
- Report Number(s):
- LBL-23924; CONF-8708165-2; ON: DE88002233
- Resource Relation:
- Conference: Symposium on the origin and distribution of elements, New Orleans, LA, USA, 31 Aug 1987; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
Similar Records
REVISED BIG BANG NUCLEOSYNTHESIS WITH LONG-LIVED, NEGATIVELY CHARGED MASSIVE PARTICLES: UPDATED RECOMBINATION RATES, PRIMORDIAL {sup 9}Be NUCLEOSYNTHESIS, AND IMPACT OF NEW {sup 6}Li LIMITS
Experimental, computational, and observational analysis of primordial nucleosynthesis
Related Subjects
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELEMENT ABUNDANCE
COSMOLOGICAL MODELS
NUCLEOSYNTHESIS
BRANCHING RATIO
COMPTON EFFECT
COSMIC NEUTRINOS
DEUTERIUM
HELIUM 3
KEV RANGE
LITHIUM 6
LITHIUM 7
PARTICLE DECAY
ABUNDANCE
ALKALI METAL ISOTOPES
BASIC INTERACTIONS
COSMIC RADIATION
DECAY
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HELIUM ISOTOPES
HYDROGEN ISOTOPES
INTERACTIONS
IONIZING RADIATIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
LITHIUM ISOTOPES
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINOS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIATIONS
SCATTERING
STABLE ISOTOPES
SYNTHESIS
640106* - Astrophysics & Cosmology- Cosmology
653003 - Nuclear Theory- Nuclear Reactions & Scattering