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Magic Nature of Neutrons in Ca54 : First Mass Measurements of Ca55–57
- Source :
- Physical Review Letters. 121
- Publication Year :
- 2018
- Publisher :
- American Physical Society (APS), 2018.
-
Abstract
- We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990) keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.
- Subjects :
- Physics
010308 nuclear & particles physics
Band gap
Astrophysics::High Energy Astrophysical Phenomena
Nuclear Theory
General Physics and Astronomy
01 natural sciences
Atomic mass
Isotopes of calcium
Atomic orbital
Neutron number
0103 physical sciences
Neutron
MAGIC (telescope)
Atomic physics
Nuclear Experiment
010306 general physics
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 121
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi...........4db5dd1da3d4ac73d325fa2616d23a6a