Naslov
Localizing the Shape Transition in Neutron-Deficient Selenium

Autori
Henderson, J. ; Wu, C. Y. ; Ash, J. ; Bender, P. C. ; Elman, B. ; Gade, A. ; Grinder, M. ; Iwasaki, H. ; Kwan, E. ; Longfellow, B. ; Mijatović, T. ; Rhodes, D. ; Spieker, M. ; Weisshaar, D.

Izvornik
Physical Review Letters (0031-9007) 121 (2018), 8; 082502, 5

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Spectroscopic factors, electromagnetic moments

Sažetak
Neutron-deficient selenium isotopes are thought to undergo a rapid shape change from a prolate deformation near the line of beta stability towards oblate deformation around the line of N=Z. The point at which this shape change occurs is unknown, with inconsistent predictions from available theoretical models. A common feature in the models is the delicate nature of the point of transition, with the introduction of even a modest spin to the system sufficient to change the ordering of the prolate and oblate configurations. We present a measurement of the quadrupole moment of the first-excited state in radioactive 72Se—a potential point of transition—by safe Coulomb excitation. This is the first low-energy Coulomb excitation to be performed with a rare-isotope beam at the reaccelerated beam facility at the National Superconducting Cyclotron Laboratory. By demonstrating a negative spectroscopic quadrupole moment for the first-excited 2+ state, it is found that any low-spin shape change in neutron-deficient selenium does not occur until 70Se.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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