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Spectroscopy of the neutron-deficient N=50 nucleus Rh-95
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.ORCID-id: 0000-0003-1771-2656
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.ORCID-id: 0000-0002-1406-5695
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.ORCID-id: 0000-0003-1996-0805
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 89, nr 4, s. 044310-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The neutron-deficient semimagic (neutron number N = 50) Rh-95 nucleus has been produced at high spins using the projectile-target system Ca-40 + Ni-58 at 125 MeV beam energy. The gamma-decays of levels populated by the 3p fusion evaporation reaction channel were studied using gamma-gamma coincidences, and 20 new gamma-ray transitions involving 15 new positive-and negative-parity states were observed. Spin and parity for many of the excited states were firmly deduced for the first time using the combined directional angular correlation and direction-polarization techniques. The observed structures are discussed within the framework of large-scale shell model calculations. E1 transition strengths were deduced and used together with the results of the shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.

Ort, förlag, år, upplaga, sidor
2014. Vol. 89, nr 4, s. 044310-
Nyckelord [en]
Level Structure, States
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-145265DOI: 10.1103/PhysRevC.89.044310ISI: 000334300300002Scopus ID: 2-s2.0-84899687197OAI: oai:DiVA.org:kth-145265DiVA, id: diva2:717665
Forskningsfinansiär
Vetenskapsrådet, 621-2010-4723 621-2012-3805EU, FP7, Sjunde ramprogrammet, 262010
Anmärkning

QC 20140516. Updated from manuscript to article in journal.

Tillgänglig från: 2014-05-16 Skapad: 2014-05-15 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Experimental Nuclear Structure Studies in the Vicinityof the N = Z Nucleus 100Sn and in the ExtremelyNeutron Deficient 162Ta Nucleus
Öppna denna publikation i ny flik eller fönster >>Experimental Nuclear Structure Studies in the Vicinityof the N = Z Nucleus 100Sn and in the ExtremelyNeutron Deficient 162Ta Nucleus
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This work covers spectroscopic studies of nuclei from different regions of the Segré chart whose properties illustrate the delicate balance between the forces in the atomic nucleus. Studies of nuclei far from stability offer new insights into the complex nucleon many-body problem. In nuclei with equal neutron and proton numbers (N = Z), the unique nature of the atomic nucleus as an object composed of two distinct types of fermions can be expressed as enhanced correlations arising between neutrons and protons occupying orbitals with the same quantum numbers. The bound N = Z nuclei with mass number A > 90 can only be produced in the laboratory at very low cross sections. The related problems of identifying and distinguishing such reaction products and their associated gamma rays have prevented a firm interpretation of their structure even for the lowest excited states until recently. In the present work the experimental difficulties of observation of excited states in the N = Z = 46 nucleus 92Pd have been overcome through the use of a highly efficient, state-of-the-art detector system; the EXOGAM-Neutron Wall-DIAMANT setup, and a prolonged experimental running period. The level spacings in the ground state band of 92Pd give the first experimental evidence for a new spin-aligned neutron-proton (np) paired phase, an unexpected effect of enhanced np correlations for N = Z nuclei in the immediate vicinity of the doubly magic nucleus 100Sn.

Excited states in 94Ru and 95Rh nuclei close to the double magic shell  Z = N = 50 have been studied in order to untangle the ambiguity of the spin and the parity of the lowest-lying states. The observed yrast structures are compared to results of large-scale shell model (LSSM) calculations and the strengths of hindered E1 transitions are used as a sensitive test of the LSSM parameters. The effect of single-particle-hole excitations is discussed in terms of the strength of hindered E1 transitions.

Excited states of the odd-odd nucleus 162Ta have been observed using the JUROGAM/RITU experimental set-up. This nucleus is located in a transitional region in the nuclide chart which is between near-spherical nuclei and well-deformed nuclei, offering the possibility to study the emergence of collective phenomena and nuclear deformation (in particular the degree of triaxiality). The results, which are interpreted in the framework of the cranked shell model with total Routhian surface calculations, suggest an almost axially symmetric nuclear shape. The energy staggering between the signature partners of the yrast rotational bands has been deduced for eight odd-odd isotopes in the neighborhood of 162Ta nucleus and the special observed feature of signature inversion for these nuclei is discussed.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. viii, 75
Serie
TRITA-FYS, ISSN 0280-316X ; 14:02
Nyckelord
Nuclear structure
Nationell ämneskategori
Annan fysik
Forskningsämne
Fysik
Identifikatorer
urn:nbn:se:kth:diva-141421 (URN)978-91-7595-007-5 (ISBN)
Disputation
2014-02-28, FB52, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20140217

Tillgänglig från: 2014-02-14 Skapad: 2014-02-14 Senast uppdaterad: 2014-05-16Bibliografiskt granskad

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Cederwall, BoQi, ChongBäck, Torbjörn

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Ghazi Moradi, FarnazCederwall, BoQi, ChongBäck, TorbjörnAtaç, AyşeLiotta, RobertoDoncel, MariaJohnson, Arne
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Physical Review C. Nuclear Physics
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