Half-Life Measurement for the rp -Process Waiting Point Nuclide Z{sup 80}r

Journal Article · Mon Mar 06 04:00:00 EST 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.84.2104· OSTI ID:20215642

Ressler, J J ^[1]; Piechaczek, A ^[2]; Walters, W B ^[1]; Aprahamian, A ^[3]; Wiescher, M ^[3]; Batchelder, J C ^[4]; Bingham, C R ^[5]; Brenner, D S ^[6]; Ginter, T N ^[7]; Gross, C J ^[4]

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1. Department of Chemistry, University of Maryland, College Park, Maryland 20742 (United States)
2. Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
3. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
4. UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States)
5. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
6. Department of Chemistry, Clark University, Worcester, Massachusetts 01610 (United States)
7. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)

X-ray bursts have been suggested as a possible site for the astrophysical rp -process. The time scale for the process is governed by {beta} -decay half-lives of several even-even N=Z waiting point nuclei, in particular, N=Z=40 {sup 80}Zr . A 4.1(+0.8-0.6)- s {beta}{sup +}/EC half-life for {sup 80}Zr was determined by observing delayed 84-keV {gamma} rays depopulating a T{sub 1/2}=4-{mu}s isomer at 312 keV in the daughter {sup 80}Y . As this half-life is lower than many previously predicted values, the calculated excessive production of A=80 nuclides in astrophysical x-ray burst scenarios is reduced, and less extreme conditions are necessary for the production of heavier nuclides. (c) 2000 The American Physical Society.

• OSTI ID: 20215642
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 84; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
COSMIC X-RAY BURSTS
EXPERIMENTAL DATA
HALF-LIFE
NEUTRON STARS
THEORETICAL DATA
THERMONUCLEAR REACTIONS
ZIRCONIUM 80