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Title: Intruder configurations of excited states in the neutron-rich isotopes P 33 and P 34

Abstract

Excited states in the neutron-rich isotopes P-33 and P-34 were populated by the O-18 + O-18 fusion-evaporation reaction at E-lab = 24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect gamma transitions in coincidence with the charged particles emitted from the compound nucleus S-36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in P-33 and 21 gamma rays and 20 energy levels were observed in P-34 for the first time. The nearly 4 pi geometry of Gammasphere allowed the measurement of gamma-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)(h) over bar omega PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both P-33 and P-34.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics
OSTI Identifier:
1460089
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P. -L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Macchiavelli, A. O., Paschalis, S., Petri, M., Reviol, W., and Sarantites, D. G. Intruder configurations of excited states in the neutron-rich isotopes P33 and P34. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.044312.
Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P. -L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Macchiavelli, A. O., Paschalis, S., Petri, M., Reviol, W., & Sarantites, D. G. Intruder configurations of excited states in the neutron-rich isotopes P33 and P34. United States. doi:10.1103/PhysRevC.97.044312.
Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P. -L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Macchiavelli, A. O., Paschalis, S., Petri, M., Reviol, W., and Sarantites, D. G. Sun . "Intruder configurations of excited states in the neutron-rich isotopes P33 and P34". United States. doi:10.1103/PhysRevC.97.044312.
@article{osti_1460089,
title = {Intruder configurations of excited states in the neutron-rich isotopes P33 and P34},
author = {Lubna, R. S. and Tripathi, Vandana and Tabor, S. L. and Tai, P. -L. and Kravvaris, K. and Bender, P. C. and Volya, A. and Bouhelal, M. and Chiara, C. J. 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 Macchiavelli, A. O. and Paschalis, S. and Petri, M. and Reviol, W. and Sarantites, D. G.},
abstractNote = {Excited states in the neutron-rich isotopes P-33 and P-34 were populated by the O-18 + O-18 fusion-evaporation reaction at E-lab = 24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect gamma transitions in coincidence with the charged particles emitted from the compound nucleus S-36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in P-33 and 21 gamma rays and 20 energy levels were observed in P-34 for the first time. The nearly 4 pi geometry of Gammasphere allowed the measurement of gamma-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)(h) over bar omega PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both P-33 and P-34.},
doi = {10.1103/PhysRevC.97.044312},
journal = {Physical Review C},
issn = {2469-9985},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}