Identification of 180Pb

Toth, K. S.; Batchelder, J. C.; Moltz, D. M.; Robertson, J. D.

doi:10.1007/s002180050103

Zeitschrift für Physik A

1996

DOI: 10.1007/s002180050103

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Identification of 180Pb

K. S. Toth

J. C. Batchelder

D. M. Moltz

et al.

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Cited by 4 publications

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“…In fact, the very first RDT measurement was carried out with the 90 Zr+ 90 Zr reaction at GSI in the 1980s [2,3]. For 180 Pb, in particular, these type of Zr-or Mo-induced reactions are rather favourable and have been employed in the past, for example by Toth et al, who used the 92 Mo( 90 Zr,2n) 180 Pb reaction at 420 MeV to study 180 Pb using the FMA recoil separator [24], after initially identifying it at LBNL [25]. With a gas-filled separator such as the RITU separator at JYFL [26], the transmission efficiency is well over 50% for such symmetric reactions [27].…”

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Shape coexistence at the proton drip-line: First identification of excited states inPb180

et al. 2010

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Excited states in the extremely neutron-deficient nucleus, 180 Pb, have been identified for the first time using the JUROGAM II array in conjunction with the RITU recoil separator at the Accelerator Laboratory of the University of Jyväskylä. This study Descriptions of the atomic nucleus imply complementarity between single-particle structure and collective phenomena. The interplay between these two aspects can lead to the nucleus being driven, through structural effects, to adopt different mean-field shapes for a small cost in energy -a phenomenon frequently described as nuclear shape coexistence. The light lead nuclei have long been highlighted as a dramatic example of such shape coexistence with compelling evidence in favor of this picture coming from α-decay studies. For example, fine structure is observed in the α decay of 190 Po which feeds two excited 0 + states as well as the ground state of 186 Pb [1]. Hindrance factors for the three α branches support a picture where three shape minima: prolate, oblate and spherical co-exist within a narrow range of excitation energy. A complementary strand has been to locate excited states in the very neutron-deficient lead nuclei via in-beam spectroscopy. This approach is very challenging given the very small production cross-sections involved and the overwhelming background stemming from fission products. The relevant experimental technique here is recoil-decay tagging (RDT) [2][3][4] where recoiling residues, typically produced in a heavy-ion fusion evaporation reaction, are separated from beam-like particles * Electronic address: panu.rahkila@phys.jyu.fi † Present address: ISOLDE, CERN,

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Shape coexistence at the proton drip-line: First identification of excited states inPb180

et al. 2010

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Reaching the limits of nuclear stability

2004

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αdecay ofPb180,181

et al. 2009

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A detailed α-decay study of the neutron-deficient isotope 181 Pb has been performed in the complete fusion reaction 40 Ca + 144 Sm → 184 Pb * at the velocity filter SHIP (GSI, Darmstadt). In comparison with the literature, more precise data have been deduced for the I π = (9/2 −) ground state in this nucleus, which is presumably based on the neutron νh 9/2 spherical orbital. Improved α-decay data were also measured for 180 Pb.

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Identification of 180Pb

Cited by 4 publications

References 8 publications

Shape coexistence at the proton drip-line: First identification of excited states inPb180

Shape coexistence at the proton drip-line: First identification of excited states inPb180

Reaching the limits of nuclear stability

αdecay ofPb180,181

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