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Title: Spectroscopy of the odd-odd fp-shell nucleus {sup 52}Sc from secondary fragmentation

Abstract

The odd-odd fp-shell nucleus {sup 52}Sc was investigated using in-beam {gamma}-ray spectroscopy following secondary fragmentation of a {sup 55}V and {sup 57}Cr cocktail beam. Aside from the known {gamma}-ray transition at 674(5) keV, a new decay at E{sub {gamma}}=212(3) keV was observed. It is attributed to the depopulation of a low-lying excited level. This new state is discussed in the framework of shell-model calculations with the GXPF1, GXPF1A, and KB3G effective interactions. These calculations are found to be fairly robust for the low-lying level scheme of {sup 52}Sc irrespective of the choice of the effective interaction. In addition, the frequency of spin values predicted by the shell model is successfully modeled by a spin distribution formulated in a statistical approach with an empirical, energy-independent spin-cutoff parameter.

Authors:
; ;  [1]; ; ;  [2]; ; ; ; ; ;  [1];  [3]; ; ;  [4];  [1];  [3]
  1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
  2. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. (United States)
  4. Department of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL (United Kingdom)
Publication Date:
OSTI Identifier:
20771408
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.037309; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHROMIUM 57; DISTRIBUTION; EXCITED STATES; GAMMA RADIATION; GAMMA SPECTROSCOPY; KEV RANGE; NUCLEAR DECAY; NUCLEAR FRAGMENTATION; SCANDIUM 52; SHELL MODELS; SPIN; VANADIUM 55

Citation Formats

Gade, A., Bazin, D., Mueller, W.F., Janssens, R.V.F., Carpenter, M.P., Zhu, S., Brown, B.A., Campbell, C.M., Cook, J.M., Dinca, D.-C., Glasmacher, T., Terry, J.R., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Deacon, A.N., Freeman, S.J., Kay, B.P., Mantica, P.F., and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824. Spectroscopy of the odd-odd fp-shell nucleus {sup 52}Sc from secondary fragmentation. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.037309.
Gade, A., Bazin, D., Mueller, W.F., Janssens, R.V.F., Carpenter, M.P., Zhu, S., Brown, B.A., Campbell, C.M., Cook, J.M., Dinca, D.-C., Glasmacher, T., Terry, J.R., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Deacon, A.N., Freeman, S.J., Kay, B.P., Mantica, P.F., & Department of Chemistry, Michigan State University, East Lansing, Michigan 48824. Spectroscopy of the odd-odd fp-shell nucleus {sup 52}Sc from secondary fragmentation. United States. doi:10.1103/PhysRevC.73.037309.
Gade, A., Bazin, D., Mueller, W.F., Janssens, R.V.F., Carpenter, M.P., Zhu, S., Brown, B.A., Campbell, C.M., Cook, J.M., Dinca, D.-C., Glasmacher, T., Terry, J.R., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Deacon, A.N., Freeman, S.J., Kay, B.P., Mantica, P.F., and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824. Wed . "Spectroscopy of the odd-odd fp-shell nucleus {sup 52}Sc from secondary fragmentation". United States. doi:10.1103/PhysRevC.73.037309.
@article{osti_20771408,
title = {Spectroscopy of the odd-odd fp-shell nucleus {sup 52}Sc from secondary fragmentation},
author = {Gade, A. and Bazin, D. and Mueller, W.F. and Janssens, R.V.F. and Carpenter, M.P. and Zhu, S. and Brown, B.A. and Campbell, C.M. and Cook, J.M. and Dinca, D.-C. and Glasmacher, T. and Terry, J.R. and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 and Deacon, A.N. and Freeman, S.J. and Kay, B.P. and Mantica, P.F. and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824},
abstractNote = {The odd-odd fp-shell nucleus {sup 52}Sc was investigated using in-beam {gamma}-ray spectroscopy following secondary fragmentation of a {sup 55}V and {sup 57}Cr cocktail beam. Aside from the known {gamma}-ray transition at 674(5) keV, a new decay at E{sub {gamma}}=212(3) keV was observed. It is attributed to the depopulation of a low-lying excited level. This new state is discussed in the framework of shell-model calculations with the GXPF1, GXPF1A, and KB3G effective interactions. These calculations are found to be fairly robust for the low-lying level scheme of {sup 52}Sc irrespective of the choice of the effective interaction. In addition, the frequency of spin values predicted by the shell model is successfully modeled by a spin distribution formulated in a statistical approach with an empirical, energy-independent spin-cutoff parameter.},
doi = {10.1103/PhysRevC.73.037309},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}
  • The spectra and electromagnetic transitions of the odd-odd nucleus {sup 52}Sc are calculated in the nuclear shell model approach, using the full fp shell basis functions with no truncation. Two of the most used two-body effective interactions in the fp shell yield quite different nuclear spectra. The energy levels from the two interactions are compared, as well as the magnetic and quadrupole moments and the electromagnetic transitions. The available experimental data, mostly 1{sup +} levels, are not sufficient to conclude which interaction provides a better fit. {copyright} {ital 1998} {ital The American Physical Society}
  • The nuclides /sup 52/K, /sup 52/Ca, and /sup 52/Sc have been produced by fragmentation of a uranium target with a 600 MeV proton beam. The subsequent ..beta.. decays to the daughter nuclei /sup 52/Ca, /sup 52/Sc, and /sup 52/Ti have been studied by neutron and ..gamma.. spectroscopy on sources obtained from on-line mass separation. ..beta.. decay energies have been determined by ..beta..-..gamma.. coincidence spectroscopy. In addition to the short half-life of /sup 52/K (T/sub 1/2/ = 110 +- 30 ms), we attributed two different half-lives (T/sub 1/2/ = 4.6 +- 0.3 s and T/sub 1/2/ = 8.2 +- 0.2 s)more » to /sup 52/Ca and /sup 52/Sc, respectively. A decay scheme has been established for /sup 52/K involving five ..beta.. branches to delayed neutron emitting states between 6.6 and 10.3 MeV and one ..beta.. branch to a bound level at E/sub x/ = 2.56 MeV. The /sup 52/Ca decay scheme accounts for ..beta.. branches to four levels at 1.64, 2.75, 3.46, and 4.27 MeV for which the deduced logft values restrict the angular momentum and parity to J/sup ..pi../ = 1/sup +/. For the /sup 52/Sc ground state, strong ..beta.. transitions to the 2/sup +/ (1.05 MeV) and the (4/sup +/) (2.32 MeV) levels in /sup 52/Ti strongly favor a J/sup ..pi../ = 3/sup +/ attribution. The measured Q/sub ..beta../ values for the /sup 52/Ca (5.7 +- 0.2 MeV) and /sup 52/Sc (8.02 +- 0.25 MeV) decay are noticeably lower than expected from mass systematics. The energy level diagrams of /sup 52/Ca, /sup 52/Sc, and /sup 52/Ti nuclei have been calculated in the framework of the shell model with a realistic interaction. Good agreement between theory and experiment is achieved as well for excitation energies as for mass excesses, assuring then the applicability of the theory to this region of nuclei far from stability.« less
  • An experimental study of the lower fp-shell nuclei 42,43Sc was performed via {alpha}pn and {alpha}p evaporation, respectively, from 20Ne + 28Si and 24Mg + 24Mg fusion-evaporation reactions. The experiments were conducted with the Gammasphere and Microball detector arrays. The level schemes of both nuclei have been extended considerably. Terminating states associated with the fn7/2 and d−13/2fn+17/2 configurations were identified in each nuclide, and incorporated into detailed comparisons with neighboring nuclei and with shell model calculations. The energy differences between the terminating states provide a test of the sd−fp cross-shell interactions in these calculations.
  • The lifetimes of the first excited states of the N=30 isotones {sup 50}Ca and {sup 51}Sc have been determined using the Recoil Distance Doppler Shift method in combination with the CLARA-PRISMA spectrometers. This is the first time such a method is applied to measure lifetimes of neutron-rich nuclei populated via a multinucleon transfer reaction. This extends the lifetime knowledge beyond the f{sub 7/2} shell closure and allows us to derive the effective proton and neutron charges in the fp shell near the doubly magic nucleus {sup 48}Ca, using large-scale, shell-model calculations. These results indicate an orbital dependence of the coremore » polarization along the fp shell.« less