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In-beam gamma ray and conversion electron study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fm</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>250</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

J. E. BastinOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomR.-D. HerzbergOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomP. A. ButlerOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomGraeme JonesOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomR. D. PageOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomD. G. JenkinsOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomN. AmzalOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomP. M. T. BrewOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomN. J. HammondOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomR. D. HumphreysOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomP. J. C. IkinOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomT. PageOliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomP. T. GreenleesDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandPeter G. JonesDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandR. JulinDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandS. JuutinenDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandH. KankaanpääDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandA. KeenanDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandH. KettunenDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandP. KuusiniemiDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandM. LeinoDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandA.-P. LeppänenDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandM. MuikkuDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandP. NieminenDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandP. RahkilaDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandC. ScholeyDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandJ. UusitaloDepartment of Physics, P.O. Box 35 (YFL), FIN-40014, University of Jyväskylä, FinlandE. BouchezDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceA. ChatillonDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceA. HürstelDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceW. KortenDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceY. Le CozDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceCh. TheisenDAPNIA/SPhN CEA Saclay, F-91191 Gif/Yvette Cedex, FranceD. AckermannGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyJ. GerlGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyK. HelariuttaGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyF. P. HeßbergerGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyC. SchlegelGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyH. J. WollerscheimGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyM. LachThe Henryk Niewodniczanski Institute of Nuclear Physics, PL-31-342, Krakow, PolandA. MajThe Henryk Niewodniczanski Institute of Nuclear Physics, PL-31-342, Krakow, PolandW. MȩczyńskiThe Henryk Niewodniczanski Institute of Nuclear Physics, PL-31-342, Krakow, PolandJ. StyczeńThe Henryk Niewodniczanski Institute of Nuclear Physics, PL-31-342, Krakow, PolandT. L. KhooPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439, USAC. J. ListerPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439, USAA. V. AfanasjevDepartment of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USAHans Jürgen MaierLudwig Maximilians Universität, D-80539, München, GermanyP. ReiterInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyP. BednarczycInstitut de Recherches Subatomiques, F-67037, Strasbourg, FranceK. EskolaDepartment of Physics, University of Helsinki, FIN-00014, Helsinki, FinlandK. HauschildCNSM Orsay, IN2P3/CNRS, F-91405 Orsay Campus, France

2006lv

ABI

Annotatsiya

We report on a set of in-beam studies of excited states in $^{250}\mathrm{Fm}$. We detected prompt \ensuremath{\gamma} rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyv\"askyl\"a. $^{250}\mathrm{Fm}$ nuclei were produced through the $^{204}\mathrm{Hg}$($^{48}\mathrm{Ca}$,$2n)$$^{250}\mathrm{Fm}$ fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 \ifmmode\pm\else\textpm\fi{} 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin ${4}^{+}$ up to ${18}^{+}$. The highly converted ${4}^{+}\ensuremath{\rightarrow}{2}^{+}$ transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of ${\ensuremath{\beta}}_{2}=0.28$ \ifmmode\pm\else\textpm\fi{} 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of $^{250}\mathrm{Fm}$ is measured to be 30.4 \ifmmode\pm\else\textpm\fi{} 1.5 min.

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DOI: 10.1103/physrevc.73.024308

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