In-Beam -Ray Spectroscopy of : Merging the and Shell Quenching
- RIKEN Nishina Center, Wako (Japan)
- RIKEN Nishina Center, Wako (Japan); Peking Univ., Beijing (China)
- RIKEN Nishina Center, Wako (Japan); Rikkyo Univ., Tokyo (Japan)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Richmond, VA (United States)
- Univ. of Tokyo, Wako (Japan)
- Tokyo Inst. of Technology (Japan)
- Michigan State Univ., East Lansing, MI (United States)
Neutron-rich N = 22, 24, 26 magnesium isotopes were studied in this paper via in-beam γ-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory following secondary fragmentation reactions on a carbon target at ≈ 200 MeV /nucleon. In the one- and two-proton removal channels from 39Al and 40Si beams, two distinct γ-ray transitions were observed in 38Mg, while in the one-proton removal reaction from 37Al a new transition was observed in addition to the known 2+1 → 0 +g.s. decay. From the experimental systematics and comparison to theoretical predictions it is concluded that the transitions belong to the 2+1 → 0 +g.s. and 4+1 → 2+1 decays in 36Mg and 38Mg, respectively. For 34Mg, previously reported 2+1 and 4+1 level energies were remeasured. Finally, the deduced E(4+1)/E(2+1) ratios for 34,36,38Mg of 3.14(5), 3.07(5), and 3.07(5) are almost identical and suggest the emergence of a large area of deformation extending from the N = 20 to the N = 28 shell quenching.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); Japan-U.S. Experimental Inst. for Physics with Exotic Beams (JUSEIPEN)
- DOE Contract Number:
- AC02-05CH11231; AC02-06CH11357
- OSTI ID:
- 1407207
- Journal Information:
- Physical Review Letters, Vol. 111, Issue 21; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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