Cross-shell excitations in Si31

Tai, P. -L.; Tabor, S. L.; Lubna, R. S.; Kravvaris, K.; Bender, P. C.; Tripathi, Vandana; Volya, A.; Carpenter, M. P.; Janssens, R. V.  F.; Lauritsen, T.; McCutchan, E. A.; Zhu, S.; Clark, R. M.; Fallon, P.; Paschalis, S.; Petri, M.; Macchiavelli, A. O.; Reviol, W.; Sarantites, D. G.

doi:10.1103/PhysRevC.96.014323

Title: Cross-shell excitations in ${}^{31}{Si}$

Journal Article · Fri Jul 28 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.96.014323· OSTI ID:1389306

Tai, P. -L. ^[1]; Tabor, S. L. ^[1]; Lubna, R. S. ^[1]; Kravvaris, K. ^[1]; Bender, P. C. ^[1]; Tripathi, Vandana ^[1]; Volya, A. ^[1]; Carpenter, M. P. ^[2]; Janssens, R. V. F. ^[2]; Lauritsen, T. ^[2]; McCutchan, E. A. ^[2]; Zhu, S. ^[2]; Clark, R. M. ^[3]; Fallon, P. ^[3]; Paschalis, S. ^[3]; Petri, M. ^[3]; Macchiavelli, A. O. ^[3]; Reviol, W. ^[4]; Sarantites, D. G. ^[4]

Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Washington Univ., St. Louis, MO (United States)

The ³¹Si nucleus was produced through the ¹⁸O(¹⁸O, αn) fusion-evaporation reaction at E_lab=24MeV. Evaporated α particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple γ-ray coincidence events were detected in Gammasphere. The energy and angle information for the α particles was used to determine the ³¹Si recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new γ transitions were observed, including 14 from states above the neutron separation energy. The positive-parity states predicted by the shell-model calculations in the sd model space agree well with experiment. The negative-parity states were compared with shell-model calculations in the psdpf model space with some variations in the N=20 shell gap. The best agreement was found with a shell gap intermediate between that originally used for A≈20 nuclei and that previously adapted for ^32,34P. This variation suggests the need for a more universal cross-shell interaction.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-06CH11357; SC0009883; AC02-05CH11231; FG02-88ER-40406; NSF 14-01574; AC02-05CH-11231; FG02-88ER40406

OSTI ID:: 1389306

Alternate ID(s):: OSTI ID: 1373315; OSTI ID: 1418303

Journal Information:: Physical Review C, Vol. 96, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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