Beta-decay measurements of neutron-rich thallium, lead, and bismuth by means of resonant laser ionisation

Abstract Neutron-rich thallium, lead, and bismuth isotopes were investigated at the ISOLDE facility. After mass separation and resonant laser ionisation of the produced activity, new spectroscopic data were obtained for 215,218 Bi and 215 Pb. An attempt to reach heavy thallium had to be abandoned because of a strong francium component in the beam that gave rise to a neutron background through (α,n) reactions on the aluminium walls of the experimental chamber.

Beta decay of $^{56}$Cu

AbstractThe proton-rich isotope 56 Cu was produced at the GSI On-Line Mass Separator by means ofthe 28 Si( 32 S, p3n) fusion–evaporation reaction. Its β -decay properties were studied by detecting β -delayed γ rays and protons. A half-life of 93± 3 ms was determined for 56 Cu. Compared to theprevious work, six new γ rays and three new levels were assigned to the daughter nucleus 56 Ni. Themeasured Gamow–Teller strength values for five 56 Ni levels are compared toshell-model predictions.  2001 Elsevier Science B.V. All rights reserved. PACS: 21.10.-k; 23.40.-s; 21.60.Cs; 27.40.+zKeywords: R ADIOACTIVITY 56 Cu ( β + ) [from 28 Si( 32 S, p3n)]; Measured E γ , I ; Deduced β -intensity and β -st…

Collective structure of the neutron-rich nuclei, 110Ru and 112Ru

Abstract The collective structure of 110 Ru and 112 Ru has been studied at the IGISOL facility through the beta decay of 110 Tc and 112 Tc. Neutron-rich technetium isotopes were produced by the 238 U(p, f) reaction at 20 MeV bombarding energy. The new isotope 112 Tc was found to decay with a half-life of 280(30) ms. The observed energies of the 2 + and 4 + ground state band levels in 108,110,112 Ru are almost the same. However, a steady energy decrease of the proposed gamma band head is observed with increasing neutron number, suggesting importance of triaxiality in these nuclei. In fact, only in 192 Os the second 2 + state has been observed at lower excitation than in 112 Ru. The static de…

Beta delayed alpha emission from the neutron deficient rare earth isotopes [sup 152]Tm and [sup 150]Ho

The study of beta‐delayed proton emission is a well known method to aid the determination of the beta strength distribution in nuclei far from the stability line. At the neutron deficient side of the nuclear chart the process of proton or alpha emission from excited states is energetically allowed when one goes far enough from stability. However, beta‐delayed alphas have seldom been measured for nuclei heavier than A  =  20. Here we present a study of the beta‐delayed alpha‐particle emission from 152Tm and 150Ho and their importance in the full B(GT) distribution. © 2011 American Institute of Physics

Beta decay of $^{61}$Ga

The β decay of 61Ga to its mirror nucleus 61Zn has been measured for the first time by using on-line mass separation and β-delayed gamma-ray spectroscopy. The observed decay strength to the ground state implies superallowed character in accordance with the systematics of the mirror decays in the sd and fp shell. The β feedings observed to four excited states in 61Zn are consistent with earlier spin-parity assignments based on in-beam experiments. The ground-state spin and parity for 61Ga were determined to be 3/2−.

β decay of the nuclei 60Ga (Tz=−1), 62Ga, and 70Br (Tz=0)

Investigation of a gas catcher/ion guide system at the Warsaw cyclotron

NESTER ACC; The properties of a gas-catcher/ion guide system, connected to a mass separator at the Heavy Ion Laboratory of Warsaw University, were investigated by using the α-decay recoil products 219Rn and 215Po, obtained from a 223Ra source. The “plasma effect” was studied by using a 14N beam with intensities ranging from 7 to 64 particledot operatornA, which correspond to power depositions between 1.6 dot operator 1016 and 7.2 dot operator 1017 eV/s for helium pressures of 75 and 380 hPa, respectively.

Systematics of Gamow-Teller beta decay “Southeast” of 100Sn

The energy centroids and integrated strengths of Gamow-Teller transitions in the $ \beta^{+}_{}$ and electron-capture decay are analyzed for nuclei whose proton number Z and neutron number N are restricted to 44 $ \leq$ Z $ \leq$ 50 and 50 $ \leq$ N $ \leq$ 58 . The analysis is based on data measured both with high-resolution $ \gamma$ -ray spectrometry and total $ \gamma$ -ray absorption techniques. The dependence of the considered quantities on the relative neutron excess are established after taking into account the effects due to the Coulomb interaction and mean-field level occupancies. An extrapolation of this dependence to the lightest known tin isotopes is used to estimate the decay …

Total absorption spectroscopy of 58Cu decay

The β decay of 58Cu has been studied by means of total absorption γ-ray spectroscopy. The β feeding to the 58Ni states has been measured, and the strength of the 58Cu(1+) →58Ni(0+) Gamow-Teller transition has been determined with improved accuracy.

First ß-decay spectroscopy of 135In and new ß-decay branches of 134In

Fine structure of the Gamow-Teller resonance revealed in the decay of150Ho2−isomer

The $\ensuremath{\gamma}$ rays following the $72s$ ${}^{150}\mathrm{Ho}$ ${2}^{\ensuremath{-}}$ Gamow-Teller $\ensuremath{\beta}$ decay have been investigated with the CLUSTER CUBE setup, an array of six EUROBALL CLUSTER Ge detectors in close cubic geometry, providing a $\ensuremath{\gamma}$ ray detection sensitivity of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ per $\ensuremath{\beta}$-parent decay for $\ensuremath{\gamma}$-ray energies up to 5 MeV. The fine structure of the Gamow-Teller resonance at 4.4-MeV excitation in ${}^{150}\mathrm{Dy}$ has been studied. The resolved levels are compared with Shell Model predictions.

β−decay of the neutron-rich isotope215Pb

This Brief Report reports on the first observation of the β--delayed γ decay of 215Pb, feeding states in 215Bi. The 215Pb beam was produced using resonant laser ionization and mass separated at the ISOLDE-CERN on-line mass separator. This ensured clean identification of the γ rays as belonging to the decay of 215Pb or its β-decay daughters. A half-life of 147(12) s was measured for the 215Pb β decay and a level scheme for the daughter nucleus 215Bi is proposed, resulting in an extended systematics of the excited states of the neutron-rich Bi isotopes.

First β-decay spectroscopy of $^{135}$In and new $β$-decay branches of $^{134}$In

International audience; The $\beta$ decay of the neutron-rich $^{134}$In and $^{135}$In was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number $Z=50$ above the $N=82$ shell. The $\beta$-delayed $\gamma$-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three $\beta$-decay branches of $^{134}$In were established, two of which were observed for the first time. Population of neutron-unbound states decaying via $\gamma$ rays was identified in the two daughter nuclei of $^{134}$In, $^{134}$Sn and $^{133}$Sn, at…

β-decay study of150Er,152Yb, and156Yb: Candidates for a monoenergetic neutrino beam facility

The beta decays of ^{150}Er, ^{152}Yb, and ^{156}Yb nuclei are investigated using the total absorption spectroscopy technique. These nuclei can be considered possible candidates for forming the beam of a monoenergetic neutrino beam facility based on the electron capture (EC) decay of radioactive nuclei. Our measurements confirm that for the cases studied, the EC decay proceeds mainly to a single state in the daughter nucleus.

First β -decay spectroscopy of In 135 and new β -decay branches of In 134

Electron-transporter spectrometer for on-line isotope separator

Abstract ELLJ — a conversion-electron and beta-ray spectrometer for an on-line isotope separator - is described. The instrument is a broad-range, high-transmission device consisting of a two-coil magnetic transporter plus a cooled Si(Li) detector. The spectrometer was designed to perform several kinds of coincidence measurements. A number of representative spectra of fission-product activities separated on-line at the IGISOL facility demonstrate the performance of the spectrometer.

First observation of the beta decay of117Pd and the discovery of a new isotope119Pd

In this paper we wish to report the first direct observations of the beta decays of117Pd and of a new isotope119Pd. The measuredβ-half-life is 4.3±0.3 s for117Pd. For119Pd, the existence of two beta-decaying states with the same half-life but of opposite parity cannot be excluded. The measured half-life for119Pd is 0.92±0.13 s. The observed beta half-lifes are in good agreement with the QRPA predictions. The observed level structure of117Ag and119Ag are discussed in the frame of the level systematics of the known odd Ag isotopes closer to stability.

Gamow-Teller decay of 118Pd and of the new isotope 120Pd

Abstract With the use of the proton-induced fission of 238 U and the ion guide-fed on-line mass separation, even- A isotopes of palladium with high neutron excess were studied by means of γ-ray and conversion-electron spectroscopy. The decay of 118 Pd was reinvestigated in detail, and evidence for the new isotope 120 Pd, with a half-life T 1 2 = 0.5 ± 0.1 s , was found. As established for 118 Pd and tentatively shown for 120 Pd, the β-decay of these two isotopes proceeds mainly through 0 + → 1 + Gamow-Teller transitions with log ft values between 4.2 and 4.7. The strength of individual transitions has been compared with the predictions of the shell-correction model with a deformed Woods-Sax…

Beta decay of the new isotope101Sn

The very neutron-deficient isotope 101Sn was produced in a 50Cr(58Ni, 2p5n) reaction and its decay properties were determined for the first time. By using chemically selective ion sources of an on-line mass separator, the energy spectrum and the half-life (3 ± 1 s) of beta-delayed protons of 101Sn were measured. These results are compared to theoretical predictions.

Detailed spectroscopy of doubly magic $^{132}$Sn

The structure of the doubly magic $^{132}_{50}$Sn$_{82}$ has been investigated at the ISOLDE facility at CERN, populated both by the $\beta^-$decay of $^{132}$In and $\beta^-$-delayed neutron emission of $^{133}$In. The level scheme of $^{132}$Sn is greatly expanded with the addition of 68 $\gamma$-transitions and 17 levels observed for the first time in the $\beta$ decay. The information on the excited structure is completed by new $\gamma$-transitions and states populated in the $\beta$-n decay of $^{133}$In. Improved delayed neutron emission probabilities are obtained both for $^{132}$In and $^{133}$In. Level lifetimes are measured via the Advanced Time-Delayed $\beta\gamma\gamma$(t) fas…

First observation of the β-decay of neutron-rich 215Pb and 218Bi by the pulsed-release technique and resonant laser ionisation

The neutron-rich Tl, Pb and Bi isotopes are of exceptional interest to trace the evolution of single-particle levels away from the doubly magic 208Pb towards the neutron-rich side of the nuclear chart. While 208Pb is well understood in terms of the shell model, experimental data on the heavier isotopes is very scarce and it is far from clear to what extent the shell model is upheld [1]. Furthermore, large branchings ratios for β-delayed neutron emission are expected in this mass region, adding astrophysical interest to the subject [2].

Beta-decay of 56Cu

Beta-decay studies of proton-rich isotopes near the doubly closed-shell nucleus 56Ni are of interest as (i) nuclei with a few nucleons outside a doubly-magic core are expected to represent comparatively simple configurations and thus be useful for testing nuclear shell-model predictions, and (ii) the large decay-energy window guarantees that a sizeable fraction of the strength of the allowed β-decay can be reached by the experiment. Moreover, nuclear structure properties of proton-rich N ~ Z isotopes are of astrophysical interest, e.g., concerning the EC cooling of supernovae and the astrophysical rp-process.

β decay of In133 : γ emission from neutron-unbound states in Sn133

Excited states in Sn-133 were investigated through the beta decay of In-133 at the ISOLDE facility. The ISOLDE Resonance Ionization Laser Ion Source (RILIS) provided isomer-selective ionization for In-133, allowing us to study separately, and in detail, the beta-decay branch of In-133 J(pi)= (9/2(+)) ground state and its J(pi) = (1/2(-)) isomer.Thanks to the large spin difference of the two beta-decaying states of In-133, it is possible to investigate separately the lower and higher spin states in the daughter, Sn-133, and thus to probe independently different single-particle and single-hole levels. We report here new gamma transitions observed in the decay of In-133, including those assign…

First -decay spectroscopy of and new -decay branches of

19 pags., 14 figs., 3 tabs.

CCDC 268295: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, P.Sobota, K.Szczegot, D.Wioeniewska|2005|Organometallics|24|3987|doi:10.1021/om050271o

CCDC 198193: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot|2004|Eur.J.Inorg.Chem.||1639|doi:10.1002/ejic.200300768

CCDC 243719: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot, D.Wisniewska|2005|Eur.J.Inorg.Chem.||1063|doi:10.1002/ejic.200400713

CCDC 243718: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot, D.Wisniewska|2005|Eur.J.Inorg.Chem.||1063|doi:10.1002/ejic.200400713

CCDC 268296: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, P.Sobota, K.Szczegot, D.Wioeniewska|2005|Organometallics|24|3987|doi:10.1021/om050271o

CCDC 721082: Experimental Crystal Structure Determination

Related Article: Z.Janas, D.Godbole, T.Nerkowski, K.Szczegot|2009|Dalton Trans.||8846|doi:10.1039/b907560g

CCDC 198192: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot|2004|Eur.J.Inorg.Chem.||1639|doi:10.1002/ejic.200300768

CCDC 268297: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, P.Sobota, K.Szczegot, D.Wioeniewska|2005|Organometallics|24|3987|doi:10.1021/om050271o

CCDC 243721: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot, D.Wisniewska|2005|Eur.J.Inorg.Chem.||1063|doi:10.1002/ejic.200400713

CCDC 243720: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, K.Przybylak, P.Sobota, K.Szczegot, D.Wisniewska|2005|Eur.J.Inorg.Chem.||1063|doi:10.1002/ejic.200400713

CCDC 721083: Experimental Crystal Structure Determination

Related Article: Z.Janas, D.Godbole, T.Nerkowski, K.Szczegot|2009|Dalton Trans.||8846|doi:10.1039/b907560g

CCDC 721085: Experimental Crystal Structure Determination

Related Article: Z.Janas, D.Godbole, T.Nerkowski, K.Szczegot|2009|Dalton Trans.||8846|doi:10.1039/b907560g

CCDC 268294: Experimental Crystal Structure Determination

Related Article: Z.Janas, L.B.Jerzykiewicz, P.Sobota, K.Szczegot, D.Wioeniewska|2005|Organometallics|24|3987|doi:10.1021/om050271o

CCDC 604895: Experimental Crystal Structure Determination

Related Article: Z.Janas, D.Wisniewska, L.B.Jerzykiewicz, P.Sobota, K.Drabent, K.Szczegot|2007|Dalton Trans.||2065|doi:10.1039/b616961a

CCDC 721084: Experimental Crystal Structure Determination

Related Article: Z.Janas, D.Godbole, T.Nerkowski, K.Szczegot|2009|Dalton Trans.||8846|doi:10.1039/b907560g