Improvements to the on-line mass separator, RAMA, and the beta-delayed charged-particle emission of proton-rich sd shell nuclei [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 159 pages : digital, PDF file
- Additional Creators:
- Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- To overcome the extreme difficulties encountered in the experimental decay studies of proton drip line nuclei, several techniques have been utilized, including a helium-jet transport system, particle identification detectors and mass separation. Improvements to the ion source/extraction region of the He-jet coupled on-line Recoil Atom Mass Analyzer (RAMA) and its target/ion source coupling resulted in significant increases in RAMA efficiencies and its mass resolution, as well as reductions in the overall transit time. At the 88-Inch Cyclotron at LBNL, the decays of ³¹Cl, ²⁷P and ²⁸P, with half-lives of 150 msec, 260 msec and 270.3 msec, respectively, were examined using a he-jet and low-energy gas ΔE-gas ΔE-silicon E detector telescopes. Total beta-delayed proton branches of 0.3% and 0.07% in ³¹Cl and ₂₇P, respectively, were estimated. Several proton peaks that had been previously assigned to the decay of ³¹Cl were shown to be from the decay of ²⁵Si. In ²⁷P, two proton groups at 459 ± 14 keV and 610 ± 11 keV, with intensities of 7 ± 3% and 92 ± 4% relative to the main (100%) group were discovered. The Gamow-Teller component of the preceding beta-decay of each observed proton transition was compared to results from shell model calculations. Finally, a new proton transition was identified, following the β-decay of ²⁸P, at 1,444 ± 12 keV with a 1.7 ± 0.5% relative intensity to the 100% group. Using similar low-energy detector telescopes and the mass separator TISOL at TRIUMF, the 109 msec and 173 msec activities, ¹⁷Ne and ³³Ar, were studied. A new proton group with energy 729 ± 15 keV was observed following the beta-decay of ¹⁷Ne. Several discrepancies between earlier works as to the energies, intensities and assignments of several proton transitions from ¹⁷Ne and ³³Ar were resolved.
- Report Numbers:
- E 1.99:lbnl--38848
lbnl--38848 - Subject(s):
- Other Subject(s):
- Chlorine 37.
- Proton-Emission Decay
- Phosphorus 27.
- Phosphorus 28.
- Neon 17.
- Argon 33.
- Helium
- Silicon 25.
- Beta Decay
- Target Chambers
- Beam Optics
- Charged Particle Detection
- Radiation Detectors
- Isotope Separators
- Alpha Decay
- Daughter Products
- Reaction Product Transport Systems
- Gamow-Teller Rules
- Delayed Alpha Particles
- Delayed Protons
- Accelerator Facilities
- Dissertation Note:
- Thesis (Ph.D.); PBD: Mar 1996
- Note:
- Published through SciTech Connect.
03/01/1996.
"lbnl--38848"
"DE96012908"
Ognibene, T.J. - Funding Information:
- AC03-76SF00098
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