Mass measurements of highly neutron-excess nuclei in the light elements
- Univ. of California, Berkeley, CA (United States)
The 26Mg(7Li,8B)25Ne reaction at 78.9 MeV was used to measure the mass-excess of 25Ne (-2.18 ± 0.10 MeV) and several low- lying excited states. Mass-excesses for 43Ar (-31.98 ± 0.07 MeV), 45Ar (-29.727 ± 0.06 MeV), and 46Ar (-29.732 ± 0.07 MeV) were determined from the 48Ca(α,9,7Be)43,45Ar reactions at 77.7 MeV and the 48Ca(6Li,8B)46Ar reaction at 80.1 MeV. Several excited states of 43Ar and 45Ar were observed. These and the excited states of 25Ne are compared with theoretical predictions. Ground state differential cross sections are given for all reactions, ranging from 0.1 to 1 μb/sr at forward angles. Upper limits of about 1 to 25 nb/sr were determined for the ground state cross sections of the reactions 48Ca(α,8,10,11B)44,42,41Cl and 48Ca(α,10-13C)42-39S at 110 MeV. Recoil coincidence techniques were used to measure the mass-excess of the particle- unbound nucleus 10Li(33.83 ± 0.25 MeV) by the 9Be(9Be,8B)10Li reaction at 121 MeV; the ground state cross section was 30 nb/sr. The 14C(9Be,8B)15B reaction at 120 MeV was also investigated using coincidence techniques. Contamination problems only permitted determining a ground state cross section upper limit of 50 nb/sr. A simple mass relation is derived, similar in approach to the Garvey-Kelson method but taking more explicit account of shell effects. Comparison is made with the Garvey- Kelson relation, and predictions of masses and of the stability of neutron-excess light nuclei are given for both methods. The modified mass relation is shown to offer better account for highly neutron-excess nuclei, including the values reported here for 25Ne and 43,45,46Ar.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-33-008487
- OSTI ID:
- 4136568
- Report Number(s):
- LBL-4029
- Resource Relation:
- Other Information: Thesis. Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
ALPHA REACTIONS- ARGON 45- BERYLLIUM 7- CALCIUM 48
ALPHA REACTIONS- BORON 10- CALCIUM 48- CHLORINE 42
ALPHA REACTIONS- BORON 11- CALCIUM 48- CHLORINE 41
ALPHA REACTIONS- BORON 8- CALCIUM 48- CHLORINE 44
ALPHA REACTIONS- CALCIUM 48- CARBON 10- SULFUR 42
ALPHA REACTIONS- CALCIUM 48- CARBON 11- SULFUR 41
ALPHA REACTIONS- CALCIUM 48- CARBON 12- SULFUR 40
ALPHA REACTIONS- CALCIUM 48- CARBON 13- SULFUR 39
ARGON 46- BORON 8- CALCIUM 48- LITHIUM 6 REACTIONS
BERYLLIUM 9 REACTIONS- BORON 15- BORON 8- CARBON 14
BERYLLIUM 9- BERYLLIUM 9 REACTIONS- BORON 8- LITHIUM 10
BORON 8- LITHIUM 7 REACTIONS- MAGNESIUM 26