Direct mass measurements of light neutron-rich nuclei using the Time-of-Flight Isochronous (TOFI) magnetic spectrometer
This experiment utilized a new type of recoil spectrometer, called the Time-of-Flight-Isochronous (TOFI) spectrometer. Due to the isochronous property of this system, measurement of the ion's time of flight through the spectrometer provides a precise value of the mass-to-charge ratio. The charge state of the recoil was determined from additional measurements of the ion's energy and velocity. Consequently, the mass is determined from one fundamental high-precision measurement, the time of flight through the spectrometer. By taking advantage of the high-intensity 800-MeV proton beam at LAMPF, sufficient statistics were accumulated to do simultaneous mass measurements of a whole set of light neutron-rich nuclei with accuracies of 100 to 900 keV. In this first experiment the masses of eight neutron-rich nuclei (/sup 19/C, /sup 27 -28/Ne, /sup 32 -34/Al, /sup 36/Si, and /sup 37/P) were measured for the first time, and the masses of /sup 20 -21/N /sup 23/O, /sup 23 -20/F, /sup 28 -30/Na, /sup 30 -32/Mg were remeasured with comparable or improved accuracy. These measurements were compared to a variety of atomic mass models to test their predictive powers and to point out systematic deficiencies of these theories. No evidence for the sudden onset of prolate deformation at N = 20 as noted for /sup 31 -32/Na is found from our measurements of /sup 30 -32/Mg and /sup 32 -34/Al.
- Research Organization:
- Utah State Univ., Logan (USA)
- OSTI ID:
- 5773591
- Resource Relation:
- Other Information: Thesis (Ph.D)
- Country of Publication:
- United States
- Language:
- English
Similar Records
The Time-of-Flight Isochronous (TOFI) spectrometer for direct mass measurements of exotic light nuclei
Time-of-flight isochronous (TOFI) spectrometer for direct mass measurements of exotic light nuclei
Related Subjects
ALUMINIUM 32
MASS
ALUMINIUM 33
ALUMINIUM 34
CARBON 19
FLUORINE 23
FLUORINE 24
FLUORINE 25
FLUORINE 26
MAGNESIUM 30
MAGNESIUM 31
MAGNESIUM 32
NEON 27
NEON 28
NITROGEN 20
OXYGEN 23
PHOSPHORUS 37
SILICON 36
SODIUM 28
SODIUM 29
SODIUM 30
EXPERIMENTAL DATA
LAMPF LINAC
NUCLEAR DEFORMATION
TIME-OF-FLIGHT SPECTROMETERS
ACCELERATORS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ALUMINIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON ISOTOPES
DATA
DEFORMATION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUORINE ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
LINEAR ACCELERATORS
MAGNESIUM ISOTOPES
MEASURING INSTRUMENTS
MESON FACTORIES
MILLISEC LIVING RADIOISOTOPES
NEON ISOTOPES
NITROGEN ISOTOPES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN ISOTOPES
PHOSPHORUS ISOTOPES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON ISOTOPES
SODIUM ISOTOPES
SPECTROMETERS
651320* - Nuclear Properties & Reactions
A=6-19
Experimental
651420 - Nuclear Properties & Reactions
A=20-38
Experimental