Isomeric Character of the Lowest Observed 4+ State in S44

Parker, J. J.; Wiedenhöver, I.; Cottle, P. D.; Baker, J.; McPherson, D.; Riley, M. A.; Santiago-Gonzalez, D.; Volya, A.; Bader, V. M.; Baugher, T.; Bazin, D.; Gade, A.; Ginter, T.; Iwasaki, H.; Loelius, C.; Morse, C.; Recchia, F.; Smalley, D.; Stroberg, S. R.; Whitmore, K.; Weisshaar, D.; Lemasson, A.; Crawford, H. L.; Macchiavelli, A. O.; Wimmer, K.

doi:10.1103/PhysRevLett.118.052501

Isomeric Character of the Lowest Observed $4^{+}$ State in ${}^{44}S$

Journal Article · Tue Jan 31 00:00:00 EST 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.052501· OSTI ID:1379702

Parker, J. J. ^[1]; Wiedenhöver, I. ^[1]; Cottle, P. D. ^[1]; Baker, J. ^[1]; McPherson, D. ^[1]; Riley, M. A. ^[1]; Santiago-Gonzalez, D. ^[1]; Volya, A. ^[1]; Bader, V. M. ^[2]; Baugher, T. ^[2]; Bazin, D. ^[3]; Gade, A. ^[2]; Ginter, T. ^[3]; Iwasaki, H. ^[2]; Loelius, C. ^[2]; Morse, C. ^[2]; Recchia, F. ^[3]; Smalley, D. ^[3]; Stroberg, S. R. ^[2]; Whitmore, K. ^[2] more »

Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Dept. of Physics and Astronomy
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
National Heavy Ion Accelerator (GANIL), Caen (France)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics

Previous experiments observed a 4⁺ state in the N=28 nucleus S⁴⁴ and suggested that this state may exhibit a hindered E2-decay rate, inconsistent with being a member of the collective ground state band. We populate this state via two-proton knockout from a beam of exotic Ar⁴⁶ projectiles and measure its lifetime using the recoil distance method with the GRETINA γ-ray spectrometer. The result, 76(14)_stat(20)_syst ps, implies a hindered transition of B(E2;4⁺→2$$+\atop{1}$$)=0.61(19) single-particle or Weisskopf units strength and supports the interpretation of the 4⁺ state as a K=4 isomer, the first example of a high-K isomer in a nucleus of such low mass.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; NA0000979

OSTI ID:: 1379702

Alternate ID(s):: OSTI ID: 1341936
OSTI ID: 23108435

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 118; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

Inverse-kinematics proton scattering from S 42 , 44 , P 41 , 43 , and the collapse of the N = 28 major shell closure Riley, L. A.; Bazin, D.; Belarge, J. Physical Review C, Vol. 100, Issue 4 https://doi.org/10.1103/physrevc.100.044312	journal	October 2019

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