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Title: Cross-shell excitations in Si 31

Abstract

The Si-31 nucleus was produced through the O-18(18O, an) fusion-evaporation reaction at E-lab = 24 MeV. Evaporated a particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple gamma-ray coincidence events were detected in Gammasphere. The energy and angle information for the alpha particles was used to determine the Si-31 recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new gamma 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 approximate to 20 nuclei and that previously adapted for P-32,P-34. This variation suggests the need for a more universal cross-shell interaction.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [4]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Washington Univ., St. Louis, MO (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1389306
Alternate Identifier(s):
OSTI ID: 1373315; OSTI ID: 1418303
Grant/Contract Number:  
AC02-06CH11357; SC0009883; AC02-05CH-11231; FG02-88ER-40406; NSF 14-01574; FG02-88ER40406
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Sarantites, D. G. Cross-shell excitations in Si31. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.014323.
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. Cross-shell excitations in Si31. United States. doi:10.1103/PhysRevC.96.014323.
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., and Sarantites, D. G. Fri . "Cross-shell excitations in Si31". United States. doi:10.1103/PhysRevC.96.014323. https://www.osti.gov/servlets/purl/1389306.
@article{osti_1389306,
title = {Cross-shell excitations in Si31},
author = {Tai, P. -L. and Tabor, S. L. and Lubna, R. S. and Kravvaris, K. and Bender, P. C. and Tripathi, Vandana and Volya, A. and Carpenter, M. P. and Janssens, R. V. F. and Lauritsen, T. and McCutchan, E. A. and Zhu, S. and Clark, R. M. and Fallon, P. and Paschalis, S. and Petri, M. and Macchiavelli, A. O. and Reviol, W. and Sarantites, D. G.},
abstractNote = {The Si-31 nucleus was produced through the O-18(18O, an) fusion-evaporation reaction at E-lab = 24 MeV. Evaporated a particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple gamma-ray coincidence events were detected in Gammasphere. The energy and angle information for the alpha particles was used to determine the Si-31 recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new gamma 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 approximate to 20 nuclei and that previously adapted for P-32,P-34. This variation suggests the need for a more universal cross-shell interaction.},
doi = {10.1103/PhysRevC.96.014323},
journal = {Physical Review C},
number = 1,
volume = 96,
place = {United States},
year = {2017},
month = {7}
}

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