New isotopes from {sup 78}Kr fragmentation and the ending point of the astrophysical rapid-proton-capture process

Journal Article · Mon Jun 05 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.4611· OSTI ID:71565

Blank, B; Andriamonje, S; Czajkowski, S; Davi, F; Del Moral, R; Dufour, J P; Fleury, A; Musquere, A; Pravikoff, M S ^[1]; Grzywacz, R; Janas, Z; Pfuetzner, M ^[2]; Grewe, A; Heinz, A; Junghans, A ^[3]; Lewitowicz, M ^[4]; Sauvestre, J ^[5]; Donzaud, C ^[6]

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1. Centre d`Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France)
2. Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Hoza 69 (Poland)
3. Institut fuer Kernphysik, Technische Hochschule Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt (Germany)
4. Grand Accelerateur National d`Ions Lourds, B.P. 5027, F-14021 Caen Cedex (France)
5. Centre d`Etudes de Bruyeres-le-Chatel, B.P. 12, F-91680 Bruyeres-le-Chatel (France)
6. Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany)

In an experiment at the SISSI/LISE facility of GANIL, we used the projectile fragmentation of a {sup 78}Kr primary beam at 73 MeV/nucleon to produce new isotopes of astrophysical interest. We obtained clear evidence for the existence of the five new isotopes {sup 60}Ga, {sup 64}As, {sup 69,70}Kr, and {sup 74}Sr. However, we did not find any evidence for {sup 69}Br, whereas comparable nuclei were observed with more than 1000 counts. The isotope {sup 69}Br is thus deduced to be a proton-unbound nucleus with a half-life shorter than about 100 ns. The influence of these results on our understanding of the astrophysical RP process is discussed.

• OSTI ID: 71565
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ARSENIC ISOTOPES
ASTROPHYSICS
BROMINE ISOTOPES
CAPTURE
FRAGMENTATION
GALLIUM ISOTOPES
GEV RANGE 01-10
HALF-LIFE
KRYPTON 78
KRYPTON ISOTOPES
PROJECTILES
PROTONS
STRONTIUM ISOTOPES