A new μs isomer in 136Sb produced in the projectile fission of 238U

Mineva, Milena; Hellström, M.; Bernas, M.; Gerl, J.; Grawe, H.; Pfützner, M.; Regan, P. H.; Rejmund, M.; Rudolph, Dirk; Becker, F.; Bingham, C. R.; Enqvist, T.; Fogelberg, B.; Gausemel, H.; Geißel, H.; Genevey, J.; Górska, M.; Grzywacz, R.; Hauschild, K.; Janas, Z.; Kojouharov, I.; Kopatch, Y.; Korgul, A.; Körten, W.; Kurcewicz, J.; Lewitowicz, M.; Lucas, R.; Mach, H.; Mandal, S.; Mayet, P.; Mazzocchi, C.; Pinston, J.A.; Podolyák, Zs.; Schaffner, H.; Schlegel, C.; Schmidt, Karl‐Heinz; Sümmerer, K.; Wollersheim, H. J.

doi:10.1007/s100500170091

Cited by 31 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These features allow the search for and highly-selective spectroscopy of new isomers over a wide range of exotic nuclei far from stability. This was first demonstrated by R. Grzywacz et al in an experiment at GANIL in 1995 [18], and a number of the succeeding experiments [3,4,[19][20][21][22][23][24] have provided a wealth of spectroscopic information on the nuclear structure of exotic nuclei.…”

Section: Introductionmentioning

confidence: 87%

“…All the previously reported isomeric -rays in the following known isomers are identified in the present experiment: 43 S m [76], 54 Sc m [20,44], 60 V m1, m2 [77], 76 Ni m [2], 75 Cu m1, m2 [77], 78 Zn m [3], 95 Kr m [55], 106 Nb m [78], 125 Cd m [79], 127 Cd m [80], 128 Cd m1, m2 [23], 130 Cd m [4], 129 In m [81], 130 In m [82], 131 In m [83], 130 Sn m [84], 134 Sn m [85] and 136 Sb m [22,86] as listed in Table II, and overall we find good agreement with the previous measurements, including the relative -ray intensities and the level schemes. The previously reported  coincidences in 78 Zn m [3], 95 Kr m [55], 129 In m [81] and 134 Sn m [85] are confirmed.…”

Section: R Other Isomersmentioning

confidence: 99%

See 1 more Smart Citation

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

Kameda¹,

Kubo²,

Ohnishi³

et al. 2012

Phys. Rev. C

Self Cite

159

View full text Add to dashboard Cite

A search for isomeric γ-decays among fission fragments from 345 MeV/nucleon 238 U has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected and identified using the superconducting in-flight separator BigRIPS and were implanted in an aluminum stopper. Delayed γ-rays were detected using three clover-type high-purity germanium detectors located at the focal plane within a time window of 20 μs following the implantation. We identified a total of 54 microsecond isomers with half-lives of ~ 0. on the obtained spectroscopic information and the systematics in neighboring nuclei. Nature of the nuclear isomerism is discussed in relation to evolution of nuclear structure.KEYWORDS: Nuclear reactions Be( 238 U, x) and Pb( 238 U, x) E = 345 MeV/nucleon, in-flight fission, fission fragments, in-flight RI beam separator, short-lived isomers, new isomers, half-life, γ-ray relative intensity, γγ coincidence, proposed level schemes DOI: PACS number(s): 23.35.+g, 23.20.Lv, 29.38.Db _____________________ *

show abstract

Section: Introductionmentioning

confidence: 87%

Section: R Other Isomersmentioning

confidence: 99%

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

Kameda¹,

Kubo²,

Ohnishi³

et al. 2012

Phys. Rev. C

Self Cite

159

View full text Add to dashboard Cite

show abstract

“…Further away from stability, Sn nuclei and their vicinity have been studied by using relativistic fission [5][6][7] and fragmentation [8,9] reactions. Intermediatespin states were observed either directly after in-flight mass separation of µs isomeric states, produced by thermal neutroninduced fission [10][11][12], or by the β decay of intermediate-spin long-lived (seconds) In isomers [13,14].…”

Section: Introductionmentioning

confidence: 99%

New sub-μs isomers in125,127,129Snand isomer systematics of
Lozeva¹,
Simpson²,
Grawe³
et al. 2008
Phys. Rev. C
Self Cite

View full text Add to dashboard Cite

New sub-µs isomers have been observed in the neutron-rich Sn isotopes. 125,127,129 Sn nuclei have been produced in a relativistic fission reaction of 238 U on a 9 Be target at 750 A·MeV and by the fragmentation of 136 Xe at 600 A·MeV populating high-spin yrast states. In addition to the already known µs isomers, three new ones with sub-µs half-lives have been observed. These yrast isomers are the high-spin members of the ν(d −1 3/2 h −2 11/2 ) and νh −n 11/2 , seniority v = 3 multiplets leading to isomeric (23/2 + ) and (27/2 − ) states, respectively. Added to the already known 19/2 + µs isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h 11/2 orbital at N = 82. The results are discussed in the framework of state-of-the-art shell-model calculations using realistic interactions.

show abstract

“…More than 40 years ago, levels in the twovalence-proton nucleus 134 Te [15,16] were first identified this way. The advent of large-volume Ge detectors and improved beam intensities allowed nuclei with orders-ofmagnitude weaker fission yields to be studied at the ILL [17] and at GSI [18]. The recent commissioning of the SRC cyclotron and BigRIPS spectrometer at RIBF, RIKEN, combined with the installation of the EURICA (Euroball-RIKEN Cluster Array) Ge γ-ray detector array, gives a unique opportunity to push the boundaries of spectroscopic studies to even more neutron-rich systems.…”

mentioning

confidence: 99%

Yrast 6+Seniority Isomers of136,138Sn

Simpson¹,

Gey²,

Jungclaus³

et al. 2014

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Delayed γ-ray cascades, originating from the decay of ð6 þ Þ isomeric states, in the very neutron-rich, semimagic isotopes 136;138 Sn have been observed following the projectile fission of a 238 U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f 7=2 neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the BðE2; 6 þ → 4 þ Þ rate of 136 Sn, which deviates from a simple seniority scheme. Empirically reducing the νf 2 7=2 orbit matrix elements produces a 4 þ 1 state with almost equal seniority 2 and 4 components, correctly reproducing the experimental BðE2; 6 þ → 4 þ Þ rate of 136 Sn. These data provide a key benchmark for shell-model interactions far from stability.

show abstract

A new μs isomer in 136Sb produced in the projectile fission of 238U

Cited by 31 publications

References 0 publications

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

New sub-μs isomers in125,127,129Snand isomer systematics of
Lozeva¹,
Simpson²,
Grawe³
et al. 2008
Phys. Rev. C
Self Cite

Yrast 6+Seniority Isomers of136,138Sn

Contact Info

Product

Resources

About

A new μs isomer in 136Sb produced in the projectile fission of 238U

Cited by 31 publications

References 0 publications

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon238U

New sub-μs isomers in125,127,129Snand isomer systematics ofLozeva1, Simpson2, Grawe3 et al. 2008Phys. Rev. CSelf Cite

Yrast 6+Seniority Isomers of136,138Sn

Contact Info

Product

Resources

About

New sub-μs isomers in125,127,129Snand isomer systematics of
Lozeva¹,
Simpson²,
Grawe³
et al. 2008
Phys. Rev. C
Self Cite