Universität zu Köln

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V, Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V, Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S. and Valiente-Dobon, J. J. (2019). Lifetime measurements of N similar or equal to 20 phosphorus isotopes using the AGATA gamma-ray tracking spectrometer. Phys. Rev. C, 100 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Lifetimes of excited states of the phosphorus isotopes P-33, 34, 35, 36(15) have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of S-36 ions of energy 225 MeV incident on a thin Pb-208 target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA gamma-ray tracking array was used to detect gamma-rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For P-33, lifetime limits were determined for the first 3/2(+) and 5/2(+) states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2(+) state of P-34 at 429 keV was determined and compared with earlier measurements. For P-35, the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with J(pi) values of 3/2(+), 5/2(+), 7/2(1)(-) and 7/2(2)(-), respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched pi(1f(7/2)) circle times nu(1f(7/2)) J(pi )= (7(+)) state of P-36 at 5212 keV and a lifetime limit was established for the stretched pi(1d(3/2)) circle times nu(1f(7/2)) J(pi )= (5(-)) state at 2030 keV. There are no previously published lifetimes for states of P-36. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however there is evidence that the shell-model values of the M1 transition rates for the 3/2(1)(+)-> 1/2(+) (ground state) and 5/2(1)(+) -> 3/2(1)(+) transitions in P-33 underestimate the experimental values by a factor between 5 and 10. In P-35 there are some disagreements between experimental and shell-model values of branching ratios for the first and second excited 7/2(-) states. In particular, there is a serious disagreement for the decay characteristics of the second 7/2(-) state at 4493 keV, for which the shell-model counterpart lies at 4754 keV. In this case, the shell-model competing electromagnetic decay branches are dominated by E1 and M1 transitions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Grocutt, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chapman, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bouhelal, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haas, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goasduff, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Courtin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bazzacco, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braunroth, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Capponi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Corradi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Derkx, X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Desesquelles, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doncel, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fioretto, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gottardo, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Liberati, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Melon, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mengoni, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michelagnoli, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mijatovic, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Modamio, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Montagnoli, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montanari, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mulholland, K. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Napoli, D. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrache, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pipidis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Recchia, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sahin, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, P. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stefanini, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szilner, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valiente-Dobon, J. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-124439
DOI:	10.1103/PhysRevC.100.064308
Journal or Publication Title:	Phys. Rev. C
Volume:	100
Number:	6
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-DATA SHEETS; SHELL-MODEL; MAGNETIC SPECTROMETER; STATES; DETECTOR; DECAY Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12443