Lifetime measurements probing collectivity in the ground-state band of 32Mg

Elder, R.; Iwasaki, H.; Ash, J.; Bazin, D.; Bender, P. C.; Braunroth, T.; Campbell, C. M.; Crawford, H. L.; Elman, B.; Gade, A.; Grinder, M.; Kobayashi, N.; Longfellow, B.; Mijatović, T.; Pereira, J.; Revel, A.; Rhodes, D.; Weisshaar, D.

doi:10.1103/physrevc.104.024307

Title: Lifetime measurements probing collectivity in the ground-state band of ³²Mg

Journal Article · Wed Aug 04 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.104.024307· OSTI ID:1811910

^[1];

^[2]; Ash, J. ^[2];

^[2]; Bender, P. C. ^[3]; Braunroth, T. ^[4]; Campbell, C. M. ^[5]; Crawford, H. L. ^[5]; Elman, B. ^[2]; Gade, A. ^[2]; Grinder, M. ^[2]; Kobayashi, N. ^[6]; Longfellow, B. ^[2]; Mijatović, T. ^[7]; Pereira, J. ^[2];

^[2]; Rhodes, D. ^[2];

^[2]

Washington and Lee Univ., Lexington, VA (United States)
Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
Univ. zu Koln (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Osaka Univ. (Japan)
Michigan State Univ., East Lansing, MI (United States); Ruder Boskovic Inst., Zagreb (Croatia)

The signatures of inversion between normal and intruder configurations of particle-hole excitations across the N = 20 shell gap in the neutron-rich isotope ³²Mg have long been of keen interest. Electromagnetic transition rates in the ground-state band are key quantities that provide insights into collective properties associated with the contributions of the 2p2h and 4p4h intruder configurations. The combination of TRIPLEX, GRETINA, and the S800 spectrograph enables model-independent lifetime measurements to determine electromagnetic transition rates in rare isotopes. The reduced E2 transition rates in ³²Mg between the 2$$^{+}_{1}$$ and 0$$^{+}_{1}$$ states and between the 4$$^{+}_{1}$$ and 2$$^{+}_{1}$$ states have been measured, the latter representing the first experimental B(E2) value for this transition. Here, the B(E2) strengths indicate large collectivity and strong contributions from the 2p2h and 4p4h intruder configurations that may change with spin in the ground-state band of ³²Mg.

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Research Organization:: Univ. of California, Berkeley, CA (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); U.S. National Science Foundation (NSF)

Grant/Contract Number:: NA0003180; SC0020451; PHY-1565546; SC0014537; AC02-05CH11231

OSTI ID:: 1811910

Alternate ID(s):: OSTI ID: 1811914; OSTI ID: 1812218

Journal Information:: Physical Review C, Vol. 104, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Lifetime measurements probing collectivity in the ground-state band of ³²Mg