Intruder configurations of excited states in the neutron-rich isotopes ${}^{33}\mathrm{P}$ and ${}^{34}\mathrm{P}$

Journal Article · Mon Apr 16 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.044312· OSTI ID:1462974

Lubna, Rebeka Sultana ^[1]; Tripathi, Vandana ^[1]; Tabor, S. L. ^[1]; Tai, P. -L. ^[1]; Kravvaris, K. ^[1]; Bender, P. C. ^[2]; Volya, A. ^[1]; Bouhelal, M. ^[3]; Chiara, C. J. ^[4]; Carpenter, M. P. ^[5]; Janssens, R. V. F. ^[5]; Lauritsen, T. ^[5]; McCutchan, E. A. ^[5]; Zhu, S. ^[5]; Clark, R. M. ^[6]; Fallon, P. ^[6]; Macchiavelli, A. O. ^[6]; Paschalis, S. ^[6]; Petri, M. ^[6]; Reviol, W. ^[7] ; Sarantites, D. G. ^[7]

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1. Florida State Univ., Tallahassee, FL (United States)
2. Florida State Univ., Tallahassee, FL (United States); Univ. of Massachusetts, Lowell, MA (United States)
3. Univ. Labri Tebessa, Tebessa (Algeria)
4. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); U.S. Army Research Lab., Adelphi, MD (United States)
5. Argonne National Lab. (ANL), Argonne, IL (United States)
6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
7. Washington Univ., St. Louis, MO (United States)

Here, excited states in the neutron-rich isotopes ${}_{33}\mathrm{P}$ and ${}_{34}\mathrm{P}$ were populated by the ${}_{18}\mathrm{O}+{}_{18}\mathrm{O}$ fusion-evaporation reaction at $E_{\mathrm{lab}}=24$ 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 ${}_{36}\mathrm{S}$ . 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 ${}_{33}\mathrm{P}$ and 21 $\gamma$ rays and 20 energy levels were observed in ${}_{34}\mathrm{P}$ 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) $\hslash \omega$ 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 ${}_{33}\mathrm{P}$ and ${}_{34}\mathrm{P}$ .

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States). Argonne Tandem Linac Accelerator System (ATLAS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• Grant/Contract Number: AC02-05CH11231; AC02-06CH11357; FG02-88ER40406; FG02-94ER40834; FG02-97ER41041; SC0009883
• OSTI ID: 1462974
• Alternate ID(s): OSTI ID: 1433277; OSTI ID: 1659381; OSTI ID: 1659382; OSTI ID: 1460089
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 97; ISSN PRVCAN; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS