A kvantummechanikai forgás egy sajátos formája: a forgó atommag
Title in English
A special type of quantummechanical rotation: the rotating nucleus
Panel
Physics 1
Department or equivalent
Experimental nuclear physics research group (HUN-REN Institute for Nuclear Research)
Participants
Dombrádi, Zsolt Kunné Sohler, Dorottya Zolnai, László
Starting date
2004-01-01
Closing date
2007-12-31
Funding (in million HUF)
5.981
FTE (full time equivalent)
0.00
state
closed project
Final report
Results in Hungarian
Atommagok forgásával kapcsolatos aktuális jelenségeket vizsgáltunk gamma-spektroszkópiai módszerekkel.
Királis forgásra jellemző dublett forgási sávokat azonosítottunk a 104Rh körüli atommagokban. Megmutattuk, hogy ezek az atommagok egy új királis szigetet alkotnak a magtérképen; hogy a páratlan atommagok 3-kvázirészecske belső
konfigurációjú forgási állapotai ugyanúgy lehetnek királisak, mint a páratlan-páratlan atommagok 2-kvázirészecske konfigurációjú forgási állapotai; és hogy királis-jelölt dublett forgási sávok tulajdonságai erősebben függenek a
magtörzs tulajdonságaitól mint az aktuális belső konfigurációtól.
Sávlezáró nem-kollektív nagyspinű állapotokat azonosítottunk a 106Sb, 123Cs és a 124Ba atommagokban. Kimutattuk a szuperdeformált forgási sávok lezáródásának lehetőségét a 132Ce atommagban.
Az erősen neutrontöbbletes atommagokban megmuttattuk, hogy mind az N=20, mind az N=28 mágikus szám mentén a csökkenő protonszám irányába haladva egy deformált magtartomány alakul ki. A deformáció létrejöttének az az oka, hogy a neutron egyrészecske energiák változnak a protonszám változásával és ez változás a stabilitási sáv közelében megismert héjzáródások megszűnéséhez és új héjzáródások keletkezéséhez vezet.
A 17B és a 16C példáján demonstráltuk, hogy elegendően nagy neutrontöbblet esetén a valencia neutronok lecsatolódhatnak a magtörzsről és attól független önálló kollektív mozgást végezhetnek.
Results in English
Topical subjects related to nuclear rotation have been studied using gamma-spectroscopic methods.
Doublet rotational bands characteristic for nuclear chirality have been identified in nuclei around 104Rh. We have shown that these nuclei present a new chiral island in the chart of nuclides; that rotational states based on 3-quasiparticle configurations in odd-mass nuclei can be chiral as well as the rotational states based on 2-quasiparticle configurations in odd-odd nuclei; and that the properties of the chiral-candidate doublet rotational bands depend more on the core properties than the intrinsic configuration. Band terminating non-collective high-spin states have been identified in 106Sb, 123Cs and 124Ba nuclei. We have pointed out the possibility of termination of superdeformed rotational bands in 132Ce. In nuclei with a large neutron excess formation of strongly deformed region has been found both along the N=20 and N=28 magic numbers if the number of the protons was decreased. It has been shown that the reason of the development of deformation is associated with the change of the neutron single particle energies, which may lead to disappearance of the magic magic numbers known close to the stability line and formation of new ones. Through the examples of 17B and 16C we have shown that in nuclei with even larger neutron excess decoupling of valence neutrons from the core may take place, and the decoupled neutrons may rotate or vibrate independently of the core.
Timár J; Joshi P; Starosta K; Dimitrov VI; Fossan DB; Molnár J; Sohler D; Wadsworth R; Algora A; Bednarczyk P; Curien D; Dombrádi Zs; Duchene G; Gizon A; Gizon J; Jenkins DG; Koike T; Krasznahorkay A;: Experimental evidence for chirality in the odd-A 105Rh, Physics Letters B 598: 178-187, 2004
Joshi P; Jenkins DG; Raddon PM; Simons AJ; Wadsworth R; Wilkinson AR; Fossan DB; Koike T; Starosta K; Vaman C; Timár J; Dombrádi Zs; Krasznahorkay A; Molnár J; Sohler D; Zolnai L; Algora A; Paul ES; R: Stability of chiral geometry in the odd-odd Rh isotopes: Spectroscopy of 106Rh, Physics Letters B 595: 135-142, 2004
Singh A. K; Hübel H; Domscheit J; Hagemann GB; Herskind B; Jensen DR; Wilson JN; Clark R; Cromaz M; Fallon P; Görgen A; Lee IY; Macchiavelli AO; Ward D; Amro H; Ma WC; Timár J; Ragnarsson I: Evidence for noncollective oblate structures at high spin in 123Cs, Physical Review C Nuclear Physics 70: 034315_1-034315_15, 2004
Stanoiu M; Belleguic M; Dombrádi Zs; Sohler D; Azaiez F; Brown BA; Lopez-Jimenez MJ; Saint Laurent MG; Sorlin O; Penionzhkevich Yu-E; Achouri NL; Angelique JC; Borcea C; Bourgeois C; Daugas JM; de Oli: Observation of bound excited states in 15B, European Physical Journal A 22: 5-8, 2004
Elekes Z; Dombrádi Zs; Saito A; Aoi N; Baba H; Demichi K; Fülöp Zs; Gibelin J; Gomi T; Hasegawa H; Imai N; Ishihara M; Iwasaki H; Kanno S; Kawai S; Kishida T; Kubo T; Kurita K; Matsuyama YU; Michimasa: Bound excited states in 27F, Physics Letters B 599: 17-22, 2004
Timár J; Vaman C; Starosta K; Fossan DB; Koike T; Sohler D; Lee IY; Macchiavelli AO: Role of the core in degeneracy of chiral candidate band doubling: 103Rh, Physical Review C 73: 011301(R)_1-011301(R)_5, 2006
Koike T; Starosta K; Joshi P; Rainovski G; Timár J; Vaman C; Wadsworth R: Recent progress on the investigation of spontaneous formation of chirality in rotating nuclei, J. Phys. G: Nucl. Part. Phys. 31: S1741-S1746, 2005
Sohler D; Palacz M; Dombrádi Zs; Hjorth-Jensenc M; Fahlander C; Norlin L-O; Nyberg J; Bäcke T; Lagergren K; Rudolph D; Algora A; Andreoiu C; de Angelis G; Ataci A; Bazzacco D; Cederkäll J; Cederwall B: Maximally aligned states in the proton drip line nucleus 106Sb, Nuclear Physics A 753: 251-262, 2005
Paul ES; Choy PTW; Andreoiu C; Boston AJ; Evans AO; Fox C; Gros S; Nolan PJ; Rainovski G; Sampson JA; Scraggs HC; Walker A; Appelbe DE: Joss DT; Simpson J; Gizon J; Astier A; Buforn N; Prevost A; Redo: Highest spin discrete levels in 131,132Ce: Spin generation near the mesoscopic limit, Physical Review C 71: 054309_1-054309_10, 2005
Kanungo R; Elekes Z; Babac H; Dombrádi Zs; Fülöp Zs; Gibelin J; Horváth Á; Ichikawa Y; Ideguchi E; Iwasah N; Iwasaki H; Kawai S; Kondo Y; Motobayashi T; Notani M; Ohnishi T; Ozawa A; Sakurai H; Shimo: Excited states in neutron rich boron isotopes, Physics Letters B 608: 206-214, 2005
Dombrádi Zs; Elekes Z; Kanungo R; Babac H; Fülöp Zs; Gibelin J; Horváth Á; Ideguchi E; Ichikawa Y; Iwasag N; Iwasaki H; Kannoc S; Kawai S; Kondo Y; Motobayashi T; Notani M; Ohnishi T; Ozawa A; Sakurai: Decoupling of valence neutrons from the core in 17B, Physics Letters B 621: 81-88, 2005
Elekes Z; Dombrádi Zs; Kanungo R; Babac H; Fülöp Zs; Gibelin J; Horváth Á; Ideguchi E; Ichikawa Y; Iwasa N; Iwasaki H; Kanno S; Kawai S; Kondo Y; Motobayashi T; Notani M; Ohnishi T; Ozawa A; Sakurai H: Low-lying excited states in 17,19C, Physics Letters B 614: 174-180, 2005
Kanungo R; Elekes Z; Babac H; Dombrádi Zs; Fülöp Zs; Gibelin J; Horváth Á; Ichikawa Y; Ideguchi E; Iwasah N; Iwasaki H; Kawai S; Kondo Y; Motobayashi T; Notani M; Ohnishi T; Ozawa A; Sakurai H; Shimo: Search for an isomeric state in 19C, Nuclear Physics A 757: 315-328, 2005
Belleguic M; Azaiez F; Zs. Dombrádi Zs; Sohler D; Lopez-Jimenez MJ; Otsuka T; Saint-Laurent MG; Sorlin O; Stanoiu M; Utsuno Y; Penionzhkevich Yu-E; Achouri NL; Angelique JC; Borcea C; Bourgeois C; Dau: Search for neutron excitations across the N=20 shell gap in 25-29Ne, Physical Review C 72: 054316_1-054316_7, 2005
Gaudefroy L; Sorlin O; Beaumel D; Blumenfeld Y; Dombrádi Zs; Fortier S; Franchoo S; Gelin M; Gibelin J; Grévy S; Hammache F; Ibrahim F; Kemper K; Kratz KL; Lukyanov SM; Monrozeau C; Nalpas L; Nowacki: Reduction of the Spin-Orbit Splittings at the N=28 Shell Closure, Physical Review Letters 97: 092501_1 092501_4, 2006
Gaudefroy L; Sorlin O; Beaumel D; Blumenfeld Y; Dombrádi Zs; Fortier S; Franchoo S; Gélin M; Gibelin J; Grévy S; Hammache F; Ibrahim F; Kemper K; Kratz KL; Lukyanov SM; Monrozeau C; Nalpas L; Nowacki: Study of 45Ar through (d, p) reaction at SPIRAL, J. Phys. G: Nucl. Part. Phys. 31: S1623-S1628, 2005
Elekes Z; Dombrádi Zs; Aoi N; Bishop S; Fülöp Zs; Gibelin J; Gomi T; Hashimoto Y; Imai N; Iwasa N; Iwasaki H; Kalinka G; Kondo Y; Korsheninnikov AA; Kurita K; Kurokawa M; Matsui N; Motobayashi T; Naka: Search for neutron decoupling in 22O via the (d, d'γ ) reaction, Physical Review C 74: 017306_1 017306_3, 2006
Dombrádi Zs; Elekes Z; Saito A; Aoi N; Baba H; Demichi K; Fülöp Zs; Gibelin J; Gomi T; Hasegawa H; Imai N; Ishihara M; Iwasaki H; Kanno S; Kawai S; Kishida T; Kubo T; Kurita K; Matsuyama Y; Michimasa: Vanishing N=20 Shell Gap: Study of Excited States in 27;28Ne, Physical Review Letters 96: 182501_1-182501_4, 2006
Ong HJ; Imai N; Aoi N; Sakurai H; Dombrádi Zs; Saito A; Elekes Z; Baba H; Demichi K; Fülöp Zs; Gibelin J; Gomi T; Hasegawa H; Ishihara M; Iwasaki H; Kanno S; Kawai S; Kubo T; Kurita K; Matsuyama YU; M: Neutron-dominant quadrupole collective motion in 16C, Physical Review C 73: 024610_1 024610_5, 2006
Elekes Z; Dombrádi Zs; Saito A; Aoi N; Baba H; Demichi K; Fülöp Zs; Gibelin J; Gomi T; Hasegawa H; Imai N; Ishihara M; Iwasaki H; Kanno S; Kawai S; Kishida T; Kubo T; Kurita K; Matsuyama YU; Michimasa: Proton inelastic scattering studies at the borders of the “island of inversion”: The 30,31Na and 33,34Mg case, Physical Review C 73: 044314_1-044314_5, 2006
Elekes Z; Dombrádi Zs; Bishop S; Fülöp Zs; Gibelin J; Gomi T; Hashimoto Y; Imai N; Iwasa N; Iwasaki H; Kalinka G; Kondo Y; Korsheninnikov AA; Kurita K; Kurokawa M; Matsui N; Motobayashi T; Nakamura T;: Testing of the RIKEN-ATOMKI CsI(Tl) array in the study of 22;23O nuclear structure, Eur. Phys. J. A 27, s01, 321-324, 2006
Al-Khatib A, Singh AK, Hübel H, Bringel P, Bürger A, Domscheit J, Neusser-Neffgen A, Schönwasser G, Hagemann GB, Ronn Hansen C, Herskind B, Sletten G, Wilson†JN, Timár J, Algora A, Dombrádi Zs,: Competition between collective and noncollective excitation modes at high spin in 124Ba, Physical Review C 74: 014305_1-014305_18, 2006
Timár J; Koike T; Pietralla N; Rainovski G; Sohler D; Ahn T; Berek G; Costin A; Dusling K; Li TC; Paul ES; Starosta K; Vaman C: High-spin structure of 105Ag: Search for chiral doublet bands, Physical Review C 76: 024307-1_024307-11, 2007
Elekes Z; Dombrádi Zs; Aoi N; Bishop S; Fülöp Zs; Gibelin J; Gomi T; Hashimoto Y; Imai N; Iwasa N; Iwasaki H; Kalinka G; Kondo Y; Korsheninnikov AA; Kurita K; Kurokawa M; Matsui N; Motobayashi T; Naka: Spectroscopic study of neutron shell closures via nucleon transfer in the near-dripline nucleus 23O., Physical Review Letters 98: 102502-1_102502-4, 2007
