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論文

Decay studies of new isomeric states in $$^{255}$$No

Bronis, A.*; He${ss}$berger, F. P.*; Antalic, S.*; Andel, B.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; et al.

Physical Review C, 106(1), p.014602_1 - 014602_12, 2022/07

https://doi.org/10.1103/PhysRevC.106.014602
 被引用回数：6 パーセンタイル：69.74(Physics, Nuclear)

The decay of excited states in $$^{255}$$No was investigated by applying the evaporation-residue-conversion-electron correlation technique. Two new isomeric states were observed in $$^{255}$$No together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and $$gamma$$ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in $$^{255}$$No is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2$$^{-}$$[725] Nilsson level for heavy $$N$$=153 isotones as a function of increasing proton number is confirmed.

論文

Identification of a 6.6$$mu$$s isomeric state in $$^{175}$$Ir

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; Barton, C. J.*; Antalic, S.*; Auranen, K.*; Badran, H.*; Cox, D.*; Cubiss, J. G.*; O'Donnell, D.*; et al.

Physical Review C, 99(6), p.064310_1 - 064310_6, 2019/06

https://doi.org/10.1103/PhysRevC.99.064310
 被引用回数：3 パーセンタイル：28.69(Physics, Nuclear)

An experiment has been performed to study excited states in the neutron-deficient nucleus $$^{175}$$Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyv$"a$skyl$"a$. By using isomer tagging, an isomeric state with a half-life of 6.58(15) $$mu$$s has been observed in $$^{175}$$Ir for the first time. It has been established that the isomer decays via a 45.2 ($$E1$$) - 26.1 ($$M1$$) keV cascade to new states below the previously reported ground state in $$^{175}$$Ir with $$I^{pi} = (5/2^{-})$$. We now reassign this $$(5/2^{-})$$ state to the isomeric state discovered in this study.

論文

Shape coexistence in $$^{178}$$Hg

M$"u$ller-Gatermann, C.*; Dewald, A.*; Fransen, C.*; Auranen, K.*; Badran, H.*; Beckers, M.*; Blazhev, A.*; Braunroth, T.*; Cullen, D. M.*; Fruet, G.*; et al.

Physical Review C, 99(5), p.054325_1 - 054325_7, 2019/05

https://doi.org/10.1103/PhysRevC.99.054325
 被引用回数：10 パーセンタイル：65.98(Physics, Nuclear)

陽子過剰核$$^{178}$$Hgにおける変形共存を調べることを目的として、ユヴァスキュラ大学の加速器において$$^{103}$$Rh($$^{78}$$Kr, $$p2n$$)反応によって$$^{178}$$Hgを生成し、その原子核の励起状態からの脱励起の寿命を測定した。実験データを理論計算と比較した結果、$$^{178}$$Hgでは$$^{180}$$Hgに比べ、プロレート変形した状態がより高い励起状態へとシフトするとともに、変形度が増大することがわかった。

論文

Towards saturation of the electron-capture delayed fission probability; The New isotopes $$^{240}$$Es and $$^{236}$$Bk

Konki, J.*; Khuyagbaatar, J.*; Uusitalo, J.*; Greenlees, P. T.*; Auranen, K.*; Badran, H.*; Block, M.*; Briselet, R.*; Cox, D. M.*; Dasgupta, M.*; et al.

Physics Letters B, 764, p.265 - 270, 2017/01

https://doi.org/10.1016/j.physletb.2016.11.038
 被引用回数：21 パーセンタイル：82.08(Astronomy & Astrophysics)

The new neutron-deficient nuclei $$^{240}$$Es and $$^{236}$$Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from $$^{240}$$Es produced in the fusion-evaporation reaction $$^{209}$$Bi($$^{34}$$S,3n)$$^{240}$$Es. Half-lives of 6(2)s and 22$$^{+13}_{-6}$$s were obtained for $$^{240}$$Es and $$^{236}$$Bk, respectively. Two groups of $$alpha$$ particles with energies $$E_{alpha}$$=8.19(3) MeV and 8.09(3) MeV were unambiguously assigned to $$^{240}$$Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for $$^{240}$$Es and $$^{236}$$Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

論文

First prompt in-beam $$gamma$$-ray spectroscopy of a superheavy element; The $$^{256}$$Rf

Rubert, J.*; Dorvaux, O.*; Gall, B. J. P.*; Greenlees, P. T.*; Asfari, Z.*; Piot, J.*; Andersson, L. L.*; 浅井 雅人; Cox, D. M.*; Dechery, F.*; et al.

Journal of Physics; Conference Series, 420, p.012010_1 - 012010_10, 2013/03

https://doi.org/10.1088/1742-6596/420/1/012010
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

初めての超重元素即発インビーム$$gamma$$線分光実験を$$^{256}$$Rfを対象に行った。MIVOC法を用いた大強度$$^{50}$$Tiビームの開発を行い、実験を成功させた。$$^{256}$$Rfの回転励起状態をスピン20 $$hbar$$まで観測し、その慣性能率を導出した。これらのデータから、陽子数104には大きな変形閉殻が存在しないことが明らかとなった。

論文

$$beta$$-delayed fission of $$^{186,188}$$Bi isotopes

Lane, J. F. W.*; Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Gerl, J.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kettunen, H.*; Kleinb$"o$hl, A.*; et al.

Physical Review C, 87(1), p.014318_1 - 014318_7, 2013/01

https://doi.org/10.1103/PhysRevC.87.014318
 被引用回数：16 パーセンタイル：68.72(Physics, Nuclear)

By using the technique of correlating implanted evaporation residues and their subsequent fission decay, $$beta$$-delayed fission ($$beta$$DF) of $$^{186}$$Bi has been identified for the first time and $$beta$$DF of $$^{188}$$Bi has been unambiguously confirmed. The experiments were performed at the velocity filter SHIP (GSI, Darmstadt). The $$beta$$DF probabilities for both nuclides were qualitatively estimated, and, in particular indications for a large value in the case of $$^{186}$$Bi are regarded.

論文

Shell-structure and pairing interaction in superheavy nuclei; Rotational properties of the $$Z$$=104 nucleus $$^{256}$$Rf

Greenlees, P. T.*; Rubert, J.*; Piot, J.*; Gall, B. J. P.*; Andersson, L. L.*; 浅井 雅人; Asfari, Z.*; Cox, D. M.*; Dechery, F.*; Dorvaux, O.*; et al.

Physical Review Letters, 109(1), p.012501_1 - 012501_5, 2012/07

https://doi.org/10.1103/PhysRevLett.109.012501
 被引用回数：61 パーセンタイル：88.60(Physics, Multidisciplinary)

104番元素$$^{256}$$Rfの回転励起構造をインビーム$$gamma$$線核分光の手法により初めて観測することに成功した。$$^{256}$$Rfは回転励起構造が観測された最も重い原子核であり、今回の結果は重い極限に位置する原子核の一粒子軌道殻構造と対相関に関する貴重な情報を与える。今回の実験で得られた$$^{256}$$Rfの回転状態の慣性能率の値は、陽子数104における変形閉殻の存在を明確に否定し、近年の数多くの自己無撞着平均場モデルの予測と異なる結果を示した。

論文

Alpha-$$gamma$$ decay studies of $$^{253}$$No and its daughter products $$^{253}$$Md, $$^{249}$$Fm

He${ss}$berger, F. P.*; Antalic, S.*; Ackermann, D.*; Kalaninov$'a$, Z.*; Heinz, S.*; Hofmann, S.*; Streicher, B.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.

European Physical Journal A, 48(5), p.75_1 - 75_9, 2012/05

https://doi.org/10.1140/epja/i2012-12075-8
 被引用回数：26 パーセンタイル：76.89(Physics, Nuclear)

Nuclear structure and decay of the isotope $$^{253}$$No and its decay products $$^{249}$$Fm and $$^{253}$$Md were investigated by means of $$alpha$$-$$gamma$$ spectroscopy. Besides the established strong $$alpha$$ transitions from the 9/2$$^{-}$$[734] Nilsson level in $$^{249}$$Fm, populated predominantly by the $$alpha$$ decay of $$^{253}$$No, into the ground-state(gs) rotational band, a couple of weaker $$alpha$$ lines were observed and placed into the $$^{249}$$Fm level scheme. The transition from the 7/2$$^{-}$$ level in $$^{249}$$Es, populated by the $$alpha$$ decay of $$^{253}$$Md, into the 9/2$$^{+}$$ member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. The GEANT4 simulations were performed to investigate the influence of energy summing between $$alpha$$ particles and conversion electrons (CE) on the shape of the $$alpha$$ spectra at different implantation energies, leading to evidence for a weak $$alpha$$ decay branch of $$^{253}$$No into the gs of $$^{249}$$Fm or the ground-state rotational band, respectively.

論文

The Reaction $$^{48}$$Ca + $$^{248}$$Cm $$rightarrow$$ $$^{296}$$116$$^{*}$$ studied at the GSI-SHIP

Hofmann, S.*; Heinz, S.*; Mann, R.*; Maurer, J.*; Khuyagbaatar, J.*; Ackermann, D.*; Antalic, S.*; Barth, B.*; Block, M.*; Burkhard, H. G.*; et al.

European Physical Journal A, 48(5), p.62_1 - 62_23, 2012/05

https://doi.org/10.1140/epja/i2012-12062-1
 被引用回数：176 パーセンタイル：98.81(Physics, Nuclear)

The synthesis of element 116 in the reactions of $$^{48}$$Ca+$$^{248}$$Cm was studied at the GSI-SHIP. Four decay chains from the isotope $$^{292}$$116 and one decay $$^{293}$$116 were detected at the reaction leading to the excitation energy of 40.9 MeV. The cross sections were 3.4 and 0.9 pb, respectively. The decay character reproduced the reported data at FLNR, Russia. In the $$alpha$$ decay chain, we observed the higher $$alpha$$-particle energy in the decay of $$^{289}$$114, which suggested the population and the decay of a quasiparitcle state.

論文

Isomeric states in $$^{253}$$No and $$^{253}$$Fm

Antalic, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Kalaninov$'a$, Z.*; Kindler, B.*; Khuyagbaatar, J.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.

European Physical Journal A, 47(5), p.62_1 - 62_12, 2011/05

https://doi.org/10.1140/epja/i2011-11062-y
 被引用回数：31 パーセンタイル：83.44(Physics, Nuclear)

Nuclear structure and decay of isomer in $$^{253}$$No were investigated. The isotope was produced by the reaction $$^{48}$$Ca+$$^{207}$$Pb. The excitation energy of the known single-particle isomeric state (5/2$$^{+}$$[622]) was measured by delayed coincidence between $$gamma$$-rays and implanted evaporation residues and was placed into the level scheme. In addition, decay of a high-lying multi-quasiparticle isomer in $$^{253}$$No was studied using e$$^{-}$$-$$gamma$$ coincidence measurements. A rotational band populated by its de-excitation was identified in $$^{253}$$No. A new isomeric state in $$^{253}$$Fm was observed and a partial-level scheme for this isotope is suggested. In addition $$gamma$$ transitions from excited levels are reproduced for $$^{253}$$Md.

論文

Decay studies of K isomer in $$^{254}$$No

He${ss}$berger, F. P.*; Antalic, S.*; Sulignano, B.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Kindler, B.*; Khuyagbaatar, J.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.

European Physical Journal A, 43(1), p.55 - 66, 2010/01

https://doi.org/10.1140/epja/i2009-10899-9
 被引用回数：76 パーセンタイル：95.35(Physics, Nuclear)

$$gamma$$-rays decay study of two K isomers in $$^{254}$$No was performed. Two new transitions of 778 and 856 keV could be attributed to the decay pattern of $$^{254m1}$$No (T$$_{1/2}$$=275 ms). The population of an excited band built up on this isomer ($$K$$$$^{pi}$$=8$$^{-}$$) by the decay of $$^{252m2}$$No (198 $$mu$$s) could be proven. A spontaneous fission branch of 2.0$$times$$10$$^{-4}$$ was measured for $$^{252m1}$$No, and upper limit of 1.2$$times$$10$$^{-4}$$ was estimated for $$^{252m2}$$No. These values demonstrate the high stability of multi-quasiparticle configuration against spontaneous fission.

論文

Decay studies of neutron-deficient lawrencium isotopes

Antalic, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Heinz, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; et al.

European Physical Journal A, 38(2), p.219 - 226, 2008/11

https://doi.org/10.1140/epja/i2008-10665-7
 被引用回数：37 パーセンタイル：85.64(Physics, Nuclear)

The radioactive decay of the isotopes $$^{254-256}$$Lr and their daughter products was investigated by means of $$alpha$$, prompt $$alpha-gamma$$ and delayed conversion electron$$-gamma$$ coincidence spectroscopy. The experiment was carried out at GSI by using the velocity filter SHIP to separate evaporation residues, produced in the reaction $$^{48}$$Ca+$$^{209}$$Bi, from the primary beams. In $$^{255}$$Lr, a second short-lived isomer with a half-life of 1.91 ms was found. For $$^{254,256}$$Lr, new data for $$gamma$$ transitions of levels in $$^{250,252}$$Md populated by $$alpha$$ decay were observed. The constructed level schemes are useful for the nuclear structure theory.

論文

The Reaction $$^{48}$$Ca+$$^{238}$$U $$rightarrow$$ $$^{286}$$112$$^{*}$$ studied at the GSI-SHIP

Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; et al.

European Physical Journal A, 32(3), p.251 - 260, 2007/06

https://doi.org/10.1140/epja/i2007-10373-x
 被引用回数：269 パーセンタイル：99.67(Physics, Nuclear)

The fusion reaction of $$^{48}$$Ca projectiles with$$^{238}$$U target nuclei was studied at the velocity filter SHIP of GSI. Two decay chains were measured, which fully confirm data that were previously assigned to the isotope $$^{283}$$112 in experiments at the Flerov Laboratory in Dubna. Two other events are consistent with a 50% spontaneous fission (SF) branch of this isotope. The mean value obtained for the half-life of $$^{283}$$112 is (6.9$$^{+6.9}_{-2.3}$$) s, the $$alpha$$ energy is (9.520$$pm$$0.015) MeV, and the total kinetic energy (TKE) of SF is (238$$pm$$14) MeV. The half-life of the $$alpha$$ decay daughter nucleus $$^{279}$$Ds is (0.18$$^{+0.32}_{-0.07}$$) s, and the TKE of SF is (210$$^{+32}_{-11}$$) MeV. The cross-section deduced from all four events is (0.72$$^{+0.58}_{-0.35}$$) pb, measured at an excitation energy of 34.6 MeV of the compound nucleus $$^{286}$$112.

論文

Alpha-$$gamma$$ decay studies of $$^{255}$$Rf, $$^{251}$$No and $$^{247}$$Fm

He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.

European Physical Journal A, 30(3), p.561 - 569, 2006/12

https://doi.org/10.1140/epja/i2006-10137-2
 被引用回数：53 パーセンタイル：91.46(Physics, Nuclear)

$$^{255}$$Rf, $$^{251}$$No及び$$^{247}$$Fmについて、$$alpha$$線と$$gamma$$線の検出による崩壊核分光実験を行った。実験は、ドイツ重イオン研究所の線形加速器施設UNILACにおける反跳生成核分離装置SHIPを用いて行った。SHIPで分離された蒸発残留核を焦点に設置したシリコン検出器に打ち込んだ。この検出器で$$alpha$$崩壊を検出し、また近くに設けたGe検出器で$$gamma$$線を検出した。これら同位体は、$$^{207}$$Pb($$^{50}$$Ti,2n)$$^{255}$$Rf及びこの$$^{255}$$Rfの$$alpha$$崩壊核種として生成し、さらに$$^{206}$$Pb($$^{48}$$Ca,3n)$$^{251}$$No反応及びこの$$^{251}$$Noの$$alpha$$崩壊核種として生成した。解析から次のことがわかった。(1)$$^{251}$$Noには半減期1.0秒のアイソマがあることがわかっていたが、このエネルギー準位が106keVであることがわかった。(2)また、$$^{251}$$Noには2$$mu$$sの半減期を持つ第2のアイソマがあり、$$^{206}$$Pb($$^{48}$$Ca,3n)$$^{251}$$No反応で直接生成されることがわかった。このアイソマは、2本の$$gamma$$線とコインシデンスし、解析から励起エネルギーが1700keV以上の準位にあることが示唆された。この2本の$$gamma$$線は、$$^{255}$$Rfの$$alpha$$崩壊につづく$$gamma$$遷移と一致した。

論文

Alpha-$$gamma$$ decay studies of $$^{255}$$No

He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.

European Physical Journal A, 29(2), p.165 - 173, 2006/08

https://doi.org/10.1140/epja/i2006-10083-y
 被引用回数：42 パーセンタイル：88.65(Physics, Nuclear)

The decay of $$^{255}$$No was investigated by means of $$alpha$$-$$gamma$$ spectroscopy. The experiment was carried out by using the velocity filter SHIP at GSI. The isotope was produced in the reactions $$^{208}$$Pb($$^{48}$$Ca,n)$$^{255}$$No, $$^{209}$$Bi($$^{48}$$Ca,2n)$$^{255}$$Lr (EC)-$$>$$ $$^{255}$$No, and $$^{238}$$U($$^{22}$$Ne,5n)$$^{255}$$No. Decay data for $$alpha$$-$$gamma$$ coincidence measurements were obtained, and the level structures of the daughter nucleus $$^{251}$$Fm were obtained, including the tentative assignment of (1) 9/2$$^{-}$$ for ground state and (2) 5/2$$^{+}$$ for the 200 keV isomeric state with $$T_{1/2}$$=21 $$mu$$s.

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