Precise measurement of energy of the first excited state of 115Sn (Eexc ≃ 497.3 keV)

V. A. Zheltonozhsky; A. M. Savrasov; N. V. Strilchuk; V. I. Tretyak

doi:10.1209/0295-5075/121/12001

All issues

Volume 121 / No 1 (January 2018)

EPL, 121 1 (2018) 12001

Abstract

Issue		EPL Volume 121, Number 1, January 2018


Article Number		12001
Number of page(s)		5
Section		Nuclear Physics
DOI		https://doi.org/10.1209/0295-5075/121/12001
Published online		02 March 2018

EPL, 121 (2018) 12001

Precise measurement of energy of the first excited state of ¹¹⁵Sn (E_exc ≃ 497.3 keV)

V. A. Zheltonozhsky, A. M. Savrasov^(a), N. V. Strilchuk and V. I. Tretyak

Institute for Nuclear Research - 03028 Kyiv, Ukraine

^(a) asavrasov@kinr.kiev.ua (corresponding author)

Received: 19 October 2017
Accepted: 8 February 2018

Abstract

Single beta decay of ¹¹⁵In to the first excited level of ¹¹⁵Sn ( $E_{\text{exc}}\simeq 497.3\ \text{keV}$ ) is known as β-decay with the lowest $Q_{\beta}$ value. To determine the $Q_{\beta}$ precisely, one has to measure very accurately the $E_{\text{exc}}$ value. A sample of tin enriched in ¹¹⁵Sn to 50.7% was irradiated by a proton beam at the U-120 accelerator of INR, Kyiv. The ¹¹⁵Sb radioactive isotope, created in the ¹¹⁵Sn(p,n)¹¹⁵Sb reaction, decays with $T_{1/2} = 32\ \text{min}$ to ¹¹⁵Sn populating the 497 keV level with $\simeq 96{\%}$ probability. The total statistics of ${\sim}10^{5}$ counts collected in the 497 keV peak in a series of measurements, the exact description of the peak shape and the precisely known calibration points around the 497 keV peak allowed to obtain the value $E_{\text{exc}}= 497.342(3)\ \text{keV}$ , which is the most precise to-date. This leads to the following $Q_{\beta}^{\ast }$ value for the decay ¹¹⁵In → ¹¹⁵Sn^*: $Q_{\beta}^{\ast}= 147 \pm 10\ \text{eV}$ .

PACS: 23.20.Lv – γ transitions and level energies / 25.40.Kv – Charge-exchange reactions / 27.60.+j – 90 ≤ A ≤ 149

© EPLA, 2018

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